AppliChem Pharmacopoeia Grade L-Cysteine

AppliChem Pharmacopoeia Grade L-Cysteine

L-Cysteine is a substance containingActive thiol groupAmino acids containing sulfur are commonly found in living organisms-One of the amino acids. molecular formulaC₃H₇NO₂S, molecular weight121.16Colorless crystal.L-Cysteine has become an important molecular tool in biopharmaceutical processes due to its unique chemical activity. Its main applications can be summarized into the following three directions.

1. Protein Engineering and Site directed Modification

In developmentAntibody conjugated drugsandDuring the process of long-acting drugs，L-Cysteine can replace a specific amino acid on the surface of proteins (such as antibodies) through genetic engineering technology, thereby introducingHighly reactive thiol groups,Therefore, it can be widely applied in the following scenarios:

① Antibody conjugated drugsUsing engineered thiol groups as precise "anchor points" to connect cell toxins, radioactive isotopes, or drug molecules, achievingFixed-point coupling.Compared with traditional random coupling, this method producesADCmedicineHigher uniformity, more controllable quality, and better pharmacokinetics.

② Long acting proteinConnect polyethylene glycol molecules to specific sitesL-The thiol group of cysteine can significantly prolong the half-life of protein drugs in the body and reduce the frequency of administration.

2. Cell culture process

In the industrial production of recombinant proteins such as monoclonal antibodies and recombinant hormones,L-Cysteine is a key additive for optimizing cell culture.L-Cysteine is the most important antioxidant in cellsglutathioneThe speed limiting raw material for synthesis. In large bioreactors, supplementation can be achieved throughL-Cysteine or its precursor (such asN-Acetylcysteine,NAC）To achieve the following objectives:

① Enhance cellular antioxidant capacityImprove cell viability and density;

② Reduce cell apoptosisExtend the cultivation period, therebySignificantly increase the production of target proteins;

③ Promote correct protein foldingMany therapeutic protein drugs contain complex disulfide bonds and should be added appropriatelyL-Cysteine helps maintain the reducing environment of the endoplasmic reticulum in cells, promotes the correct formation and pairing of disulfide bonds, and enhancesThe yield of active protein.

3. Downstream purification and formulation

In the downstream purification and formulation stages of recombinant protein drug production,L-Cysteine also often plays an important role:

① Depolymerization of protein aggregatesDuring the purification process, proteins may form aggregates due to non natural disulfide bonds. addLow concentration reducing agents (such asL-Cysteine or similar compoundsIt can gently restore these erroneous connections, dissociate aggregates into active monomers, and improvePurification yield.

② Antioxidant stabilizers in liquid formulationsIn the liquid formulation of protein drugs,L-Cysteine can be used asantioxidantUse to protect proteins (especially the thiol groups on their active sites) from oxidation, therebyExtend the shelf life of drugs.

AppliChem Pharmacopoeia Grade L-Cysteine

As a high-quality pharmaceutical raw material supplierPanReac AppliChemBy virtue of its product quality and strict quality control, it provides stable and high-quality pharmaceutical grade products for biopharmaceutical enterprisesL-Cysteine can meet the needs of upstream and downstream processes in biopharmaceuticals.

PanReac AppliChemMedicinal gradeL-Cysteine can provide free samples,Limited quantity, first come, first served!

PanReach AppliChem is one of the high-quality producers of biochemical reagents and pharmaceutical raw materials from Europe, with a hundred years of history and has passed multiple certificationsISOQuality system certification is a global certification for life science researchCRO/CDMOAn important supplier to enterprises, large pharmaceutical, diagnostic, food, cosmetics and other industrial enterprises. As a long-term fixed supplier to multiple global culture medium manufacturers and pharmaceutical companies,PanReac AppliChemIt is one of the few production enterprises in the world that can provide numerous pharmacopoeia grade and cell culture grade raw materials. It comprehensively offers chemicals such as cell culture grade, pharmacopoeia grade, biochemical grade, and ultra pure grade, including culture medium components such as amino acids, vitamins, antibiotics, salts, buffer solutions, stabilizers, surfactants, and commonly used chemicals in pharmaceutical processesTrisGuanyin, adenine, sodium caprylateDMSOβ - glucan, etc.

Xi Meijie isPanReac AppliChemChina's general agent, providing users with * technical support and after-sales service.