Biotechnology covers a wide range of disciplines, from the utilization of microorganisms in food production to the development of artificial organs. In fact, one of the early applications of biotechnology was in the process of producing wine. Generally speaking, biotechnology can be defined as a technology based on biology. Developing technologies and products using cell and biomolecule processes to improve our quality of life and the Earth's environment.

[Surface Treatment&Coating/Biomaterials and Medical Devices]

With the development of medical research, it has become customary to replace or support missing biological structures with implants.

The surface of biomaterials is often designed and adjusted to regulate their physical and chemical properties, improving the functionality of biomaterials in every application. According to the required use and function, it can be made of various materials including titanium, different plastics, silicone or apatite.

The commonality of all materials is that they must be biocompatible, which is typically achieved through different surface treatments or the addition of coatings. We offer a variety of instruments to assist you in designing, manufacturing, characterizing, and evaluating the surface properties and performance of biomaterials.

Design and Manufacturing of Biocompatible Coatings

Medical devices are usually made of various metals that are directly placed inside the body. In recent years, different coatings have been frequently used to improve the biocompatibility of medical devices. In addition to basic biocompatibility, other required properties such as responsiveness to various stimuli, drug delivery ability, and antibacterial quality can also be adjusted in these biomaterial coatings.

Polymers are a class of materials that are highly attractive for surface coatings in biomedical and biological applications. Polymers not only exhibit good biocompatibility, but they also make drug delivery possible. Polymers can be easily surface modified and can degrade over time when no longer needed. Within the range of available polymers, polyelectrolyte multilayer membranes provide many benefitsThe possibility of creating surface coatings with desired properties has been widely applied in biomaterials. These coatings can also be modified to release drugs or active peptides. Polymer brushes that respond to changes in temperature, pH, and ionic strength are also popular.

Polyelectrolyte multilayer membranes are formed by the layer by layer assembly of polycations and polyanions. The layer by layer assembly technology using impregnation machines has not only been proven to be an excellent method for depositing polyelectrolytes, but also enables the deposition of inorganic particles or active biomolecules on the surface of biomaterials, with the advantage of coating complex surfaces.

A simple and rapid non thermal coating method was established by using layer by layer assembly deposition to fix hydroxyapatite and TiO2 nanoparticles on polymethyl methacrylate PMMA (ACS Appl. Mater. and Interfaces 2016, 83, 5565-3557). In another study, layer by layer assembly deposition was used to deposit porous cellulose nanocrystals and poly (vinyl alcohol) CNC/PVA nanocomposite films with a thickness of 25-70nm on a glass substrate (ACS Appl. Mater. and Interfaces 2014, 612, 674-12683).

QCM-D technology is commonly used for monitoring and characterizing the construction and response of polymer brushes and polyelectrolyte multilayer membranes. The layer by layer construction of polyelectrolyte multilayer membranes can be characterized in real-time based on adsorption rate, membrane thickness, and rigidity. Subsequent interactions on the membrane, including crosslinking, swelling, calcification, drug transport, and cell adhesion, can also be characterized.

Characterization and evaluation of biocompatibility

Due to the combination of biomaterials with the biological environment to replace or improve organ or other bodily functions, the performance and biocompatibility of biomaterials or medical devices strongly depend on the interaction between the surface of the biomaterial and its physiological environment.

The biocompatibility of biomaterials can be studied by measuring the contact angle to characterize the adhesion of cells to biomaterials. The small water contact angle and high surface free energy indicate that the material has good adhesion properties. Surface roughness can also affect the interaction between biomaterials and cells.

Biocompatibility and wettability also play an important role in the development of contact lenses, with comfortable lenses requiring good wettability.

QSense QCM-D can evaluate biocompatibility based on the characteristics of the interaction between the surface and physiological environment, answer questions about protein adsorption capacity, degree of cell adhesion to different materials, surface induced immune response, and how to modify the surface of materials to optimize their functionality. Therefore, it is an effective tool for exploring, characterizing, and optimizing the properties of biomaterials.

Biocompatibility of Porous Titanium Surface

When measuring contact angles on rough surfaces of biomaterials, surface roughness should be taken into account. Titanium is a commonly used metal in bone implant applications. A certain degree of porosity is beneficial for bone integration, therefore, measuring surface roughness is a routine task in the development of biomaterials. The measurement of roughness correction contact angle can separate the influence of roughness on the contact angle value.

Application Summary - The Influence of Morphology and Wettability on Biocompatibility

[Surface roughness and wettability download]

Wetting characteristics of contact lenses

The wettability of contact lenses is a measure of the lens' ability to support continuity and resist tear film rupture on its surface. Lenses with limited wettability are uncomfortable and their visual performance decreases. Using different types of coatings to improve the quality of lenses.

Evaluate the wetting performance of contact lenses through static and dynamic contact angle measurements. Usually, bubble capture method is used for measurement because it can mimic the condition of the eye and maintain the surface of the lensThe state of hydration. The backward angle simulates the situation when the eyelids open and the tear film begins to rupture on the lens. On the other hand, the forward angle simulates the situation when the eyelids close and the tear film on the lens begins to recover.

Application Digest Download: "Bubble Capture Method for Contact Lens Research"

Real time characterization of protein adsorption

When biomaterials or medical devices are placed in the body, proteins almost immediately begin to adsorb onto the surface. In some cases, such as plastic surgery implants, protein can promote cell adhesion and organic binding of the implant, which is beneficial for adsorption. In other cases, such as scaffolds, protein adsorption is often disadvantageous due to the adsorption of certain proteins, especially fibrinogen, which may cause platelet binding and subsequent thrombosis or immune response. The conformation of proteins may also determine the activity of a surface and the biological reactions that may accompany it. Depending on the specific application, the surface of the material can be modified to achieve the desired effect.

QCM-D technology can analyze the real-time adsorption of proteins on various surfaces. Specifically, the amount of bound proteins and adsorption rate can be analyzed. Conformational information can also be inferred from dissipative responses, especially when proteins have an extended shape. This helps to screen for new medical device materials and surface modifications, and helps to understand the adsorption mechanism of proteins.

Real time characterization of cell adhesion and spreading

The adhesion between cells and the surface of biomaterials may be the main factor regulating their biocompatibility and integration. For example, the adhesion of osteoblasts and fibroblasts can promote tissue repair and wound healing. Cell adhesion depends on surface properties such as surface energy, roughness, and the proteins adsorbed on the surface.

QCM-D technology provides aespeciallyTo monitor cells in various ways, whether during initial cell adhesion, cell spreading, or real-time morphological processes. The QSense window module can simultaneously perform QCM-D and optical microscopy studies, and can correlate the morphological changes and viscoelastic properties of cells.

Characterization of biomineralization

The integration or fixation of biomaterials within bone structures is a crucial step in achieving successful implantation. One of the main reasons for implant failure is poor fixation of bone by biomaterials. In order to enhance the fixation of the implant, calcium phosphate (CaP) bioceramic coating is used as a biologically active interface between the implant and surrounding tissues. These coatings can be prepared on polyelectrolyte multilayer films, and surface modification can induce crystal nucleation and controlled growth of CaP. This method has the advantage of being applicable to complex shapes and porous materials.

QCM-D can be used for real-time monitoring of the rate and degree of biomineralization to understand the mechanism of biomineralization and adjust the function of polyelectrolyte multilayer membranes.

Related blog articles

How do surface roughness and wettability affect biocompatibility

Establish demand for hydroxyapatite chips

Five QSense chips used for research on biomaterials and medical devices]

[Interview with Professor Joy on Biomaterials Research Part 2]

[Interview with Professor Joy on Biomaterials Research]

Adsorption of Proteins on Biomaterials

[Surface Treatment&Coating/Pharmaceutical]

In the research and development of drugs, there are numerous surfaces that need to be considered and tailored for their behavior and performance in order to achieve good performance in interactions with the surrounding environment.

This typical surface is the coating of products such as drug tablets, whose properties significantly affect the delivery and release of drug compounds. Other very important surfaces are those that drugs come into contact with during formulation, storage, and administration, as well as the interactions between each surface that may affect drug stability.

drug development

QSenseThe nanogram level quality sensitivity provides unlimited potential for drug discovery and development. passQSenseThe research activities conducted include:

Real time and accurate monitoring of the interactions between small molecule drugs and proteins, cell membranes, and RNA under various experimental conditions. [1]

Protein-protein interactions [2]

Structural changes of RNA during interaction between small molecules and RNA [3]

drug delivery

QSenseIt has been proven to be a cost-effective and time efficient technology, particularly suitable for characterizing lipid nanoparticles (LNP) and their drug delivery characteristics. A large amount of literature proves thatQSenseCan be used for:

Analyze the binding affinity between serum proteins and lipid nanoparticles (LNP) [4]

Binding and release of biomolecules (such as siRNA and mRNA) on LNP [5]

Delivering LNP to the target organ [6]

Screening the binding affinity between serum proteins and LNPs in a cell-free environment [7]

Analyzing the surface modification of LNPs [8]

The interaction between lipids and bioactive molecules (including drugs, DNA, and siRNA) [9]

The effect of ApoE binding on lipid component distribution and overall LNP structure [24]

Nanoporous array for storing functionalized LNP [25]

LNP formula for improving the delivery efficiency of LNPs nucleic acid load [26]

Using cDNA to immobilize microbubbles onto supported lipid bilayers [27]

The interaction between block copolymers of stabilized cubes and biomimetic lipid membranes [28]

Protein stability analysis during formulation development and optimization, biopharmaceutical production, storage, and administration processes

利用QSense dissipative quartz crystal microbalanceAnalyze and evaluate the stability and material compatibility of biopharmaceutical formulations

Stability and material compatibility are crucial in the dynamic lifecycle of biopharmaceuticals, from initial development ideas to patient use. The complex interactions between biopharmaceuticals and various surfaces during production, storage, and administration may lead to challenges such as accidental adsorption, concentration reduction, or protein particle formation.

Proactive screening to reduce risks

Early detection of potential issues is crucial to avoid schedule disruptions and financial losses. Proactively screening for surface induced instability during the development process can help reduce the risk of later failures.QSense® QCM-D can provide comprehensive analysis of interactions in biopharmaceuticals, offering in-depth insights into molecular adsorption, desorption, and structural changes at the nanoscale for rapid detection of incompatibility.

The key capability of QSense QCM-D as an early assessment tool for the success of biopharmaceuticals

Analyze the interaction between biopharmaceuticals and related surface materials
Quickly assess the impact of materials used in the early stages of biopharmaceutical development, including production, storage, and administration, on the complete formulation.

Minimize risk by actively detecting incompatibility
Quickly measure the adsorption capacity of candidate formulations on relevant surfaces and determine methods to alleviate incompatibility.

Real time monitoring of the adsorption of antibodies and excipients
Understand the mechanism of action of surfactants and their potential as stabilizers.

QSense conducts formula development evaluation

Determine the antibody adsorption levels on different surface materials

Gain a deeper understanding of the molecular arrangement on the surface of materials

Identify which surfaces may cause compatibility issues?

Evaluate the effect of excipients on antibody adsorption

Explore how changes in concentration, pH value, temperature, surface material, or surfactant type affect adsorption levels.

Reading cases

downloadwhite skinLearn more about how to use QSense dissipative quartz crystal microbalance technology to reduce the risk of late stage incompatibility detection.

Download White SkinUsing QSense dissipative quartz crystal microbalance to analyze and evaluate the stability and material compatibility of biopharmaceutical formulationsbook

Typical cases include:

Interactions between drugs and surfaces such as polymers, glass, metals and metal oxides, silicone oil, etc. [10], [11], [12], [13], [14], [15], [16]

The effect of excipients in reducing drug protein adsorption on surfaces [17]

The influence of formula conditions (concentration, pH value, temperature, etc.); [18]

The influence of interface and interface stress in the development of biological products [19]

*Note: Up to 200 types of chips can be customized according to user requirements for chip surface

The interaction between biomaterials and human tissues

The biocompatibility of implants and biomaterials in the human body is the key to their successful functioning.QSenseProvides in vitro analysis of the interaction between implant surfaces or biomaterials and human blood and tissue at the molecular level.

The interaction between various eye care formulas and mucin/cell membrane surfaces [20].

Development of biosensors

QSenseIt is also widely used in the development of types of sensors such as protein biosensors and real-time detection sensors.

Protein biosensors [21], [22]

Point of care sensors [23]

QSense QCM-DIt is a surface sensitive technology that can detect molecular surface interactions at the nanoscale. It can be used to analyze phenomena such as adsorption, desorption, and changes in surface adhesion layer structure.

QSenseBased on QCM-D technology

The dissipative quartz crystal microbalance (QCM-D) is a real-time, surface sensitive technique that can be used to analyze surface interaction phenomena, film formation, and film properties.

Explore QCM-D

QSense Omni dissipative quartz crystal microbalance

QSense Omniis caused byQCM-DThe latest generation of dissipative quartz crystal microbalance model developed by the pioneer of technology, Sweden's Biolink Technology Co., Ltd., isQCM-Dnew technologyThe culmination of the collection.OmniThe sensitivity of QCM is higher than any other QCM on the market, which enables it to quantify and monitor smaller molecules and faster processes, making it an ideal tool for studying biological processes. QSense has over 200 types of chip surface materials and coatings to choose from, supporting simulation of real biological environments and processes to characterize protein adsorption rates, film formation, adsorption layer rigidity, calcification, cell adhesion, and more.

QSense OmniDissipative quartz crystal microbalance

Capable of detecting surface changes as small as 24 ng/cm2 on chips

Faster fluid exchange (5 times faster than the previous generation), providing faster and clearer sample delivery

Full range of automation functions to minimize user dependency

The simplified workflow and new intuitive software interface make it easier for a wider range of users to use QCM-D.

QSense advantages

Intuitive and automated laboratory equipment

Easy to implement in the laboratory

Real time data on protein interactions

Fully understand the interaction process and mechanism

The required sample size is as low as 90 μ l

Obtain valuable results from a small sample size

Results can be obtained within a few hours

Quickly display the final result

Pre programmable standard script

Easy to set up and reproduce measurements

Multiple chip options available

QSense chip for biopharmaceuticals

QSense chipEnable you to measure the interactions of various surface materials related to the production, storage, and administration of antibodies and other biopharmaceuticals - from metals and glass materials to polymers such as stainless steel, borosilicate glass, and bio grade polymers.

QSense PDMS chip

PDMSIt's for lubricating syringes and similar laboratory equipmentgoodIt is crucial to maintain the integrity of stored liquids and biological samples in these instruments. In addition, its thermal and electrical insulation properties can protect sensitive samples and components.

Discover chips that meet your needs

The chip is the core of QCM-D experiment.Browse the types in the marketcompleteIdentify which chip material and coating to use for the chipsuitableYour research needs.

Wettability characterization for coating tablet manufacturing

The coating on pills has multiple uses. Coatings are used to mask taste or odor, protect drugs from the erosion of gastric acid environment, or protect the gastric lining from invasive drugs. Coatings can also be designed to control the release characteristics of drugs. Regardless of the reason, coatings are applied to the core of tablets, and one of the prerequisites for success is good adhesion between the coating and the tablet.

To ensure good adhesion, coating formulations shouldSpread on the surface of the tablet. If some penetrates into the pores of the tablet, the adhesive force will be enhanced. The spreading of coating formulations on tablet surfaces can be evaluated by measuring contact angle and surface free energy. Due to the influence of surface porosity, combined withsurface roughnessMeasuring and determining roughness correctioncontact angleCan provide more understanding of this issue.

In some cases, it is not possible to compress drugs into tablet form due to changes in wetting properties. The Washburn method is therefore often used to determine the properties of drug compoundscontact angleThe Washburn method has also been used to study the wettability of dry polymer coatings and other processes, where polymer powders are mixed with different additivescontact angleIt is interesting.

Measurement of Contact Angle of Pharmaceutical Compounds

The pharmaceutical industry typically uses different powders as drug compounds, so understanding the wetting behavior of powders is crucial for the pharmaceutical industry.

The wettability of the powder can be achieved bySigma 700/701Measure using the Washburn method. In the Washburn method, the contact angle is calculated based on the increase in weight over time when the powder comes into contact with the liquid.

References

[1] Small-molecule-mediated control of the anti-tumour activity and off-tumour toxicity of a supramolecular bispecific T cell engagerNat. Biomed. Eng 2024, 8 (5), 513–528. https://doi.org/10.1038/s41551-023-01147-6.

[2] Genentech–Viscoelastic characterization of high concentration antibody formulations using quartz crystal microbalance with dissipation monitoringJournal of Pharmaceutical Sciences 2009, 98 (9), 3108–3116.
https://doi.org/10.1002/jps.21610.

[3] Roche–Reconstitution and Functional Analysis of a Full-Length Hepatitis C Virus NS5B Polymerase on a Supported Lipid BilayerACS Cent. Sci. 2016, 2 (7), 456–466. https://doi.org/10.1021/acscentsci.6b00112.

[4]A Fast and Reliable Method Based on QCM-D Instrumentation for the Screening of Nanoparticle/Blood InteractionsBiosensors 2023, 13 (6), 607. https://doi.org/10.3390/bios13060607.

[5]A QCM-D and SAXS Study of the Interaction of Functionalised Lyotropic Liquid Crystalline Lipid Nanoparticles with siRNAChemBioChem 2017, 18 (10), 921–930. https://doi.org/10.1002/cbic.201600613.

[6]Helper lipid structure influences protein adsorption and delivery of lipid nanoparticles to spleen and liverBiomater. Sci. 2021, 9 (4), 1449–1463.
https://doi.org/10.1039/D0BM01609H.

[7] AstraZeneca –Screening of the binding affinity of serum proteins to lipid nanoparticles in a cell free environmentJournal of Colloid and Interface Science 2022, 610, 766–774. https://doi.org/10.1016/j.jcis.2021.11.117.

[8]Insights into the mechanisms of interaction between inhalable lipid-polymer hybrid nanoparticles and pulmonary surfactantJournal of Colloid and Interface Science 2023, 633, 511–525.
https://doi.org/10.1016/j.jcis.2022.11.059.

[9]On the interactions between RNA and titratable lipid layers: implications for RNA delivery with lipid nanoparticlesNanoscale 2024, 16 (2), 777–794.
https://doi.org/10.1039/D3NR03308B.

[10] Genentech –Adsorption and Aggregation of Monoclonal Antibodies at Silicone Oil–Water InterfacesMol. Pharmaceutics 2021, 18 (4), 1656–1665. https://doi.org/10.1021/acs.molpharmaceut.0c01113.

[11] Bristol-Myers Squibb– Mechanistic Understanding of Protein-Silicone Oil InteractionsPharm Res 2012, 29 (6), 1689–1697.
https://doi.org/10.1007/s11095-012-0696-6.

[12] Bristol-Myers Squibb –Adsorption of polypropylene oxide-polyethylene oxide type surfactants at surfaces of pharmaceutical relevant materials: effect of surface energetics and surfactant structuresPharmaceutical Development and Technology 2019, 24 (1), 70–79. https://doi.org/10.1080/10837450.2018.1425431.

[13] Bristol-Myers Squibb –Particle Characterization for a Protein Drug Product Stored in Pre-Filled Syringes Using Micro-Flow Imaging, Archimedes, and Quartz Crystal Microbalance with DissipationAAPS J 2017, 19 (1), 110–116.
https://doi.org/10.1208/s12248-016-9983-1.

[14] Pfizer –Engineering a ceramic piston pump to minimize particle formation for a therapeutic immunoglobulin: A combined factorial and modeling approach.J Adv Manuf & Process 2023, 5 (1), e10142.
https://doi.org/10.1002/amp2.10142.

[15]Antibody adsorption and orientation on hydrophobic surfacesLangmuir 2012, 28 (3), 1765–1774.
https://doi.org/10.1021/la203095p.

[16] AstraZeneca–The Impact of the Metal Interface on the Stability and Quality of a Therapeutic Fusion ProteinMol. Pharmaceutics 2020, 17 (2), 569–578. https://doi.org/10.1021/acs.molpharmaceut.9b01000.

[17] Janssen Pharmaceuticals (Johnson and Johnson) –Quartz Crystal Microbalance as a Predictive Tool for Drug-Material of Construction Interactions in Intravenous Protein Drug AdministrationJournal of Pharmaceutical Sciences 2023, 112 (12), 3154–3163. https://doi.org/10.1016/j.xphs.2023.07.019.

[18] Eli Lilly –Surface Interactions of Monoclonal Antibodies Characterized by Quartz Crystal Microbalance with Dissipation: Impact of Hydrophobicity and Protein Self-InteractionsJournal of Pharmaceutical Sciences 2012, 101 (2), 519–529.
https://doi.org/10.1002/jps.22771.

[19] Bristol-Myers Squibb –Overview of the Impact of Protein Interfacial Instability on the Development of Biologic ProductsIn Protein Instability at Interfaces During Drug Product Development; Li, J., Krause, M. E., Tu, R., Eds.; AAPS Advances in the Pharmaceutical Sciences Series; 2021; Vol. 43, pp 1–8.
https://doi.org/10.1007/978-3-030-57177-1_1.

[20] Novartis Pharma –Understanding the adsorption and potential tear film stability properties of recombinant human lubricin and bovine submaxillary mucins in an in vitro tear film modelColloids and Surfaces B: Biointerfaces 2020, 195, 111257. https://doi.org/10.1016/j.colsurfb.2020.111257.

[21]Dual-mode and Label-free Detection of Exosomes from Plasma Using an Electrochemical Quartz Crystal Microbalance with Dissipation MonitoringAnal. Chem. 2022, 94 (5), 2465–2475. https://doi.org/10.1021/acs.analchem.1c04282.

[22]Amplified QCM-D biosensor for protein based on aptamer-functionalized gold nanoparticlesBiosensors and Bioelectronics 2010, 26 (2), 575–579. https://doi.org/10.1016/j.bios.2010.07.034.

[23]Bioactivated PDMS microchannel evaluated as sensor for human CD4+ cells – The concept of a point-of-care method for HIV monitoring. Sensors and Actuators B: Chemical 2007, 123 (2), 847–855.
https://doi.org/10.1016/j.snb.2006.10.034.

[24]Apolipoprotein E Binding Drives Structural and Compositional Rearrangement of mRNA-Containing Lipid Nanoparticles.ACS Nano 2021, 15 (4), 6709–6722. https://doi.org/10.1021/acsnano.0c10064.

[25]Development of Nanopackaging for Storage and Transport of Loaded Lipid Nanoparticles.. Nano Lett. 2023, 23 (14), 6760–6767.
https://doi.org/10.1021/acs.nanolett.3c01271.

[26]Review of structural design guiding the development of lipid nanoparticles for nucleic acid delivery.Current Opinion in Colloid & Interface Science 2023, 66, 101705. https://doi.org/10.1016/j.cocis.2023.101705.

[27]QCM-D Investigations on Cholesterol–DNA Tethering of Liposomes to Microbubbles for Therapy.J. Phys. Chem. B 2023, 127 (11), 2466–2474.
https://doi.org/10.1021/acs.jpcb.2c07256.

[28]Thermo-responsive lipophilic NIPAM-based block copolymers as stabilizers for lipid-based cubic nanoparticles.Colloids and Surfaces B: Biointerfaces 2022, 220, 112884. https://doi.org/10.1016/j.colsurfb.2022.112884.

[Biological Interface/Biofilm]

Are you exploring a world based on lipid structure?

Biofilms and liposomes based on lipid structure are widely used in research in multiple fields. For example, in the design and development of new biosensor systems, biomaterial coatings, and drug delivery systems, these structures are used as inert surfaces, biocompatible surfaces, cell membrane mimics, or transport carriers.

There are two methods that can be utilized in the study of biofilms. A floating biofilm model structure can be formed at the air-water interface, allowing you to simulate the characteristics and conditions of the cellular environment.

Another method is to form a supported biofilm or lipid based structure on a solid substrate. The supported lipid bilayer is a lipid layer deposited on the surface and composed of predetermined lipid ratios, which may be labeled as different molecules or embedded membrane proteins. These films can help understand biological processes and serve as key factors in the preparation of biomaterials. They can also participate in more complex structures such as biosensor design and interact with various biological or synthetic molecules such as ligands DNA、 The interactions between nanoparticles, polymers, or other lipid structures.

In the design and development of nanomedicine, lipid based nanostructures can serve as blood vessels and targeted carriers for drug transport. Embedding the interested drug into a vesicle or micelle structure, suitable for specific environmental conditions, enhances drug protection in stabilizing and reducing toxicity, prolonging circulation time, controlling release rate, and improving tissue targeting.

Floating biofilm model

Most biochemical reactions occur around the cell membrane or within the phospholipid bilayer membrane. The cell membrane affects protein folding and creates a specific microenvironment that triggers reactions. To understand and simulate actual biological systems, it is necessary to study these interactions in an environment that simulates natural conditions. The Langmuir monolayer of membrane phospholipids has been proven to be a good model system for biological membranes.

Langmuir monolayer phospholipid membrane is similar to a semi biological membrane and can be used as a model cell membrane, which has been proven in literature to be an excellent model for biological systems. In a free floating monolayer, the diffusion and dynamics of molecules are close to their role in actual systems. In nature, most biochemical reactions occur at the interface of biological membranes, and freely floating model membranes allow for natural diffusion and migration of molecules. To study cell biofilms, Langmuir membrane analyzer can be combined with various sensors and instruments besides Langmuir membrane balance. Other research techniques include PM-IRRAS, BAM, SPOT, fluorescence microscopy, and traditional microscopy, which make it possible to study molecular interactions, localization, stacking, and micro area formation in single molecular layers.

Simulating the behavior of pulmonary surfactants

Pulmonary surfactants cover the alveoli of the lungs and play a crucial role in making breathing easier. During inhalation, surfactants reduce the surface tension of tissues by about 15 times, making it easier for alveoli to expand. During exhalation, the surface area of the alveoli decreases, causing surfactants to concentrate more on the surface. At the end of exhalation, a nearly zero surface tension is generated, which can prevent alveolar collapse.

Dipalmitoylphosphatidylcholine (DPPC) is a phospholipid present on the surface of alveoli.The highly ordered solid phase of DPPC maintains near zero surface tension in the alveoli during exhalation. To simulate the actual surfactant behavior in alveoli, measurements need to be taken at near zero surface tension. Research has shown that the KSV NIMA Langmuir ribbon sliding film analyzer can be used to measure the near zero surface tension of DPPC.

Application Summary: Achieving High Single Molecular Layer Surface Pressure with Ribbon Slip Barrier Membrane Analyzer: Pulmonary Surfactants at Near Zero Surface Tension

Construction of supporting lipid structure

Langmuir Blodgett (LB) and Langmuir Schaefer (LS) impregnation are two methods for preparing phospholipid bilayers with different lipid compositions. By combining the LB and LS methods, an asymmetric phospholipid bilayer with lipid composition can also be created. For example, some biochemical sensors can be prepared for surface plasmon resonance spectroscopy, quartz crystal microbalance measurement, and X-ray photoelectron spectroscopy. The third method is to prepare a supported phospholipid bilayer directly on the surface through vesicle rupture and fusion in QCM-D setup.

Supporting biofilm - preparation and characterization

Whether we are dealing with supported biofilms, liposomes, or other lipid based structures, QSense QCM-D can be used to characterize and validate the relevant absorption and release processes on the surface, which is crucial for understanding, adjusting, and optimizing lipid based systems. For example, the formation kinetics of the supporting lipid membrane can be monitored on the surface, and the quality of the formed bilayer membrane can be evaluated. It is also possible to monitor subsequent interactions with lipid membranes, such as uptake or binding of membrane-bound molecules, or validation of their defective parts. In the context of nanomedicine, lipid based nanostructures can be characterized for their absorption, delivery, and release processes, and can serve as blood vessels for targeted drug delivery.

[Biological Interface/Biomolecular Interaction]

The analysis of interactions between biomolecules is a focus of many disciplines, from biochemistry and biotechnology to pharmaceutical science. It is the focus of basic science and applied research and development. The goal of studying the interactions between biomolecules is to go from purely acquiring knowledge and understanding biological systems and functions, to using the acquired knowledge to design drugs, biomimetic sensors, and technologies that improve our quality of life.

Basic understanding of the interactions between biomolecules

For example, in basic and applied research, a fundamental understanding of the mechanisms of lipid proteins and protein ligand interactions is a goal, in which these systems are studied and characterized to obtain the processes of biomolecule interactions.

QSense QCM-D is a real-time method for detecting and monitoring biomolecule interactions, such as binding and interaction dynamics, as well as structural changes in molecular layers. This method has been used to improve the understanding of target interaction mechanisms and ligand structural changes. It is also used to explore the behavior of molecules and the causes of diseases, such as protein folding disorders, peptide aggregation into long and thin fibers, amyloid like structures, etc.

Due to the fact that most biochemical reactions in nature occur on phospholipid bilayer membranes or cell membranes within cells, membranes can affect protein folding and create specific microenvironments in which reactions occur. To understand and simulate actual biological systems, it is necessary to study these interactions in an environment that simulates natural conditions. The Langmuir monolayer of membrane phospholipids has been proven to be an excellent model system for biological membranes. In drug discovery, the permeation of drugs through the cell wall and the reaction between drugs and the cell membrane are important factors in drug delivery. These can be evaluated by studying the interaction between drugs and floating biofilm models. In the food industry, the removal of allergenic proteins is very important, and a deeper understanding can be obtained through molecular level research.

Application Abstract: Interactions of biomolecules in cell membrane models.

Analysis of Biomolecular Interactions in Applied Research and Development

Once knowledge of the interaction behavior of biomolecules is established, it is possible to use this new information. In applied science, such as drug exploration, nanotoxicology, or the design of biosensors, the interactions of biomolecules are crucial, and this knowledge can be used to identify targets for new compounds and detect potential new candidate drugs.

In this context, QSense QCM-D is used to analyze proteins and their interactions with DNA, as well as to detect antibody antigen interactions. QCM-D is highly sensitive to conformational changes in the tertiary structure of small molecule bound proteins, and can be used for designing, validating, and optimizing drug compounds. For example, studying the effects of amyloid growth inhibitors, investigating the conformational effects of nucleic acid receptors, and screening compounds for their interactions with cells and protein drug targets.

The knowledge of biomolecule interactions can also be used to design biosensors and detection systems, where biological behavior is imitated and utilized, such as for detecting and diagnosing diseases.

Toxicity of nanoparticles

Nanoparticles (NPs) are now applied in many different industries, including cosmetics, paints, and coatings. Therefore, in-depth research has been conducted on the toxicity of nanoparticles. Due to its large specific surface area, inhaled nanoparticles can induce pulmonary inflammation and adverse immune reactions in the respiratory system.

The Langmuir membrane analyzer provides a method for studying the effect of nanoparticles on lipid membranesgoodThe tools. The effect of 1wt% hydroxyapatite nanoparticles on the isothermal compression curve of natural lung surfactant (Infasurf) was studied. After contact with nanoparticles, there is a significant time-dependent transition in the isothermal compression curve on the left side, indicating the inhibitory effect of surfactants.

ACS Nano 2011, 5 (8), 6410-6416. Copyright 2011 American Chemical Society. (with permission)

[Functional Surface/Sensor]

Living in today's society, information and predictability are highly valued, and we revolve around a large number of sensors to detect, detect, and measure various aspects of the surrounding environment. The amount of information collected every day is very large, with temperature, air pressure, light intensity, or toxic substances being just some examples.

Sometimes the collected data only provides us with information and convenience in daily life, such as giving us information so that we can decide whether to bring an extra sweater when going out. But it can also be used to determine whether adjustment and control are needed, such as verifying whether the pressure value remains within the preset maximum and minimum values. Each type of sensor is based on a specific detection method and can monitor parameters of interest.

Biosensors are a subclass of sensors. Biosensors utilize natural designed biometric systems for detection, such as target substances that bind to receptors. Then this information is converted and readings are collected. Sensors based on conductive polymershighThe potential for application is being extensively studied. Langmuir Blodgett technology is capable of producing highly assembled controllable thickness films and has therefore been used in sensor applications,. These sensors have been used for gas sensors and detection of trace antibiotics in solutions. Different detection methods, from optical detection to conductivity measurement, are being applied.

QSense QCM-D as an Acoustic Biosensor

Biosensors are applied in many fields, such as medical applications, food industry, and national defense. In addition to biometric components, biosensors also consist of two parts: sensors that can detect biometric recognition and interpretable signal readout. Sensors can be based on different principles. A common sensor principle is acoustic sensing, such as quartz crystal microbalance (QCM). QCM technology based on piezoelectric principle for detection is a method in biosensing and has been used for decades in the development and application of biosensors.

As detailed in this widely circulated and detailed review of acoustic biosensors, the biological detection system of biosensors can be based on antibodies, proteins DNA、 Design and construct related modules for cells, lipid structures, carbohydrates, and nanoparticles. The scope of building modules and recognition components ranges from small to large, capable of detecting everything from heavy metal ions and DNA hybridization to cell attachment, proliferation, and growth, as well as cell response to external stimuli. The potential detection system has a wide range and is constantly exploring sensor interface processing strategies to improve its sensitivity and selectivity.

Conductive polymer based sensor

With the increasing emphasis on miniaturized devices, newly developed nanomaterials can further develop this field. Many of these materials cannot be prepared using traditional microfabrication methods, but instead utilize emerging technologies.

Conductive polymers such as polyaniline, polythiophene, polypyrrole, and their derivatives have been used as active layers for gas sensors and in the fabrication of immobilized enzyme biosensors. Sensors made of conductive polymers have many excellent characteristics, such as high sensitivity and short response time. Conductive polymers are also easy to synthesize and have good mechanical properties. The LB film analyzer can be used to prepare large-area highly controllable conductive polymer films.

[Functional Surface/Biological Functional Materials]

Throughout human history, people have been attempting to replace or repair damaged or diseased body parts in order to restore and restore their function. Usually, people choose implant materials based on their availability; Modern CalendarhistoryWith the introduction of the concept of biocompatibility and the deepening of related research, biocompatibility has also become one of the important selection indicators, and we may be at the dawn of seeing new models and next-generation biomaterials.

calendarShi ZaoThe records of repairing and replacing body parts can be traced back thousands of years. At that time, the concepts of biocompatibility or sterilization had not yet been proposed. Throughout human history, materials used as substitutes for body parts have varied at different times. From sea shells in the Mayan period to ready-made materials such as polymers, metals and ceramics in the heroic era after the Second World War, to modern engineering materials designed based on biocompatibility, such as organic silicon, hydrogel and hydroxyapatite. The next generation of biomaterials is also being developed now. The new generation of materials not only has good biocompatibility, but also has certain functionality. These materials can be adjusted and used to control physiological environments and have induced responsiveness such as tissue repair.

Supramolecular and Bioactive Materials

Implants that successfully integrate the body can effectively repair missing body parts by replicating the structure of the missing tissue. But even if the implant material is compatible with the human body, there is still a possibility of long-term complications and permanent loss of tissue function. It can be foreseen that bioactive coatings can restore bodily functions through interactions such as inducing tissue regeneration and repair reactions, and work in this area is already underway. These biological functional materials are designed as stimuli responsive supramolecular nanostructures, typically consisting of polymers, synthetic membranes, or other nanoscale assemblies that are functionalized by embedding biomolecules such as proteins, peptides, or drugs. The functions of these materials are responsive and predictable, designed to perceive and respond to the surrounding physiological environment, providing a well controlled surface. These supramolecular systems and materials can not only be used as implant coatings in tissue engineering and regenerative medicine, but also as drug carriers for stimulus responsive drug delivery and immunology.

Design and characterization of supramolecular bioactive materials

These supramolecular nanostructures have the potential to modify and adjust material properties, potentially solving some current biomedical challenges and establishing the position of the next generation of biomaterials.

However, in order to design these bioactive materials in a controlled manner, it is necessary to understand the assembly process of nanoscale components and characterize the material properties under different environmental conditions. By using QSense technology, real-time monitoring of material assembly can be achieved, and the dynamic effects of different salt concentrations, temperatures, pH values, and similar environmental parameters on material structure can be characterized. This technology can also evaluate functional effects such as cell adhesion and spreading properties.

References

Biomaterials Science, 3rd edition. Introduction to Medical Materials

Editor: Buddy Ratner, Allan Hoffman, Frederick Schoen, Jack Lemons, 2012