Valine is an α-amino acid that is used in the biosynthesis of proteins. It contains an α-amino group (which is in the protonated −NH3+ form under biological conditions), an α-carboxylic acid group (which is in the deprotonated −COO− form under biological conditions), and a side chain isopropyl group, making it a non-polar aliphatic amino acid. It is essential in humans, meaning the body cannot synthesize it: it must be obtained from the diet. Human dietary sources are foods that contain protein, such as meats, dairy products, soy products, beans and legumes. In the genetic code it is encoded by all codons starting with GU, namely GUU, GUC, GUA, and GUG.
CERTIFICATE OF ANALYSIS
PRODUCT NAME:L-VALINE PRODUCTION DATE:
BATCH NO: REPORT DATE:
STANDARD:USP/FCC SHELF LIFE:2 YEARS
Tests | Limits | Test results |
Description | White crystalline powder | conforms |
Identification（IR） | concordant with the reference spectrum | conforms |
Assay | 98.5～101.5% | 100.0% |
pH | 5.5～7.0 | 5.8 |
Specific rotation[a]D 20 | +26.7°～+29.0° | +27.8° |
Chloride(Cl) | ≤0.05% | <0.05% |
Sulfate(SO4) | ≤0.03% | <0.03% |
Iron(Fe) | ≤30ppm | <30ppm |
Other amino acids | ﹤0.5% | conforms |
Loss on drying | ≤0.30% | 0.08% |
Residue on ignition | ≤0.10% | 0.02% |
Aerobic mesophilic microorganisms | ≤500cfu/g | conforms |
Enterobacteriaceae | Negative/g | conforms |
Salmonella | Negative/25g | conforms |
Conclusion: Passed test according to the Standard of USP/FCC. |
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