L-Isoleucine
White crystalline flakes or crystalline powder. Slightly bitter. Odorless. The sublimation temperature is 168-170℃. It is an essential amino acid and is necessary for the normal development of infants and the nitrogen balance of adults. There are four isomers, and only the L-form has physiological effects. Excessive consumption will have an antagonistic effect with leucine and hinder development. Adult men need 1.3g/100ml.
L-histidine
Colorless needle-like or flaky crystals, which soften at 277°C and decompose at 287°C. The solubility in water at 25°C is 41.9g/L, very slightly soluble in alcohol, insoluble in ether and chloroform. Sweet.
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