Dynamic laser light scattering instrumentAs a high-precision analytical instrument based on dynamic light scattering technology, DLS has a wide and in-depth range of applications, covering multiple disciplines such as biomedicine, materials science, food industry, environmental monitoring, and chemical engineering. The following is an analysis of specific application scenarios and core values:
1. Biomedical field: Analyzing the dynamic behavior of biomolecules
Research on protein aggregation and stability:
DLS can monitor the aggregation status of proteins in real-time under different conditions, such as temperature, pH, and ionic strength, by measuring the particle size distribution of protein molecules. For example, in the development of antibody drugs, DLS can quickly screen formulations that avoid aggregation, ensuring the stability and activity of the drug.
Case: A team used DLS to discover that a certain antibody had the narrowest particle size distribution (PDI<0.1) at pH 6.5, significantly better than the results at pH 7.4, thus optimizing drug storage conditions.
Nucleic acid and virus like particle analysis:
DLS can detect the particle size and dispersibility of nucleic acids (such as siRNA, mRNA) and evaluate their delivery efficiency; At the same time, precise measurement of the particle size of virus like particles (VLPs) provides key data for vaccine development.
Data support: The detection range of DLS (0.3 nm-10 μ m) covers most biomolecules (such as proteins: 3-100 nm; viruses: 20-200 nm).
2. In the field of materials science: optimizing the performance of nanomaterials
Characterization of nanoparticles:
DLS is a core tool for the development of nanomaterials, which can measure the hydrodynamic diameter (Dh) and polydispersity index (PDI) of nanoparticles, evaluate their dispersibility and stability. For example, in the development of nanocatalysts, DLS can screen out particles with uniform particle size (PDI<0.2) to improve catalytic efficiency.
Technical advantages: DLS has fast measurement speed (1-5 minutes per measurement), suitable for high-throughput screening (such as batch testing of 96 well plates).
Research on Polymer Polymers:
DLS can analyze the molecular weight distribution and degree of branching of polymers, and realize the simultaneous measurement of "molecular weight particle size" in combination with gel permeation chromatography (GPC). For example, in the synthesis of polylactic acid (PLA), DLS can monitor the changes in molecular weight during the polymerization process and guide process optimization.
Typical parameters: The molecular weight measurement range of DLS is 1 × 10 ³ -2 × 10 ⁷ Da, covering most polymer materials.
3. In the field of food industry: ensuring product quality and safety
Analysis of lotion and colloid system:
DLS can detect the size and distribution of fat globules in dairy products, evaluate the quality and stability of milk; At the same time, monitor the particle size of fruit pulp particles in the juice to control the taste and appearance of the product.
Case: A dairy company used DLS to discover that the average particle size of milk fat globules after homogenization treatment decreased from 3 μ m to 0.5 μ m, significantly improving the stability of the product.
Characterization of food additives:
DLS can analyze the particle size and dispersibility of food additives (such as nanocellulose and liposomes) to ensure their functionality and safety. For example, in the development of nano packaging materials, DLS can verify the uniform dispersion of nanoparticles and avoid performance degradation caused by agglomeration.
4. Environmental monitoring field: Tracking the behavior of nano pollutants
Research on Nanoparticle Pollution:
DLS can monitor the particle size changes of nano pollutants (such as TiO ₂, AgNPs) in water bodies and assess their environmental risks. For example, studies have found that AgNPs gradually aggregate under light (particle size increases from 20 nm to 200 nm), leading to reduced toxicity. DLS provides key data support for this conclusion.
Technical features: DLS can measure particles in a solution state, preserving their original state and providing data with greater environmental authenticity.
5. Chemical engineering field: optimizing reaction processes and products
Study on the kinetics of polymerization reaction:
DLS can monitor the particle size changes in real-time during polymerization reactions, revealing the reaction mechanism. For example, in micro lotion polymerization, DLS can observe the gradual growth of particles from the nanometer level (50 nm) to the micron level (2 μ m), providing a basis for reaction control.
Extension function: Some DLS instruments support temperature slope experiments, which can study the phase transition behavior of particles at different temperatures.
Analysis of Crystal Growth and Precipitation Process:
DLS can measure the particle size distribution of crystals or precipitated particles, optimizing the crystallization process. For example, in the process of drug crystallization, DLS can screen out crystals with uniform particle size (Dv50=10 μ m), improving the solubility and bioavailability of drugs.