L-Alanyl-L-cystine

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L-Alanyl-L-cystine (CAS No. 115888-13-6) is a white crystalline dipeptide composed of alanine and cystine, with a molecular weight of 382.5 g/mol and a purity of 99% min. It is commonly used in cell culture media and pharmaceutical development, especially in serum-free environments where a reliable cystine source is essential.

By providing a more stable and soluble form of cystine, this compound helps support antioxidant mechanisms and promotes cellular growth under nutrient-limited conditions. It should be stored at 2–8 °C in sealed containers to preserve quality. It is available in 25 kg fibre drums, with a monthly output of up to 1 ton to ensure stable supply for ongoing research and production needs.

CAS No.: 115888-13-6
Molecular Formula: C₁₂H₂₂N₄O₆S₂
Purity: 99% min

Appearance White crystalline powder
Molecular Weight 382.5 g/mol
Density 1.4 ± 0.1 g/cm³
Boiling Point 751.7 ± 60.0 °C at 760 mmHg
Melting Point N/A
Flash Point 408.4 ± 32.9 °C
Packaging 25 kg per fibre drum
Storage Conditions 2–8 °C

Product Name
1. L-Alanyl-L-Cystine;
2. (2R,2'R)-3,3'-Disulfanediylbis(2-((S)-2-aminopropanamido)propanoic acid);
3. (2R)-2-[(2S)-2-aminopropanamido]-3-{[(2R)-2-[(2S)-2-aminopropanamido]-2-carboxyethyl]disulfanyl}propanoic acid
Production capacity 1 ton/month
Applications Raw material for cell culture media, API intermediate

Is L-Alanyl-L-cystine suitable for serum-free cell culture?

Yes. L-Alanyl-L-cystine is used in serum-free cell culture as a dipeptide-based source of cystine. It supports antioxidant function and promotes cell growth and viability in environments where serum is absent or reduced, making it valuable in defined media formulations.

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