| http://www.w3.org/ns/prov#value | - The modified amino acids may also be purified by extraction with a lower alcohol such as methanol, butanol, or isopropanol to remove impurities such as inorganic salts. [0089] The modified amino acids generally are soluble in alkaline aqueous solution (pH>9.0); partially soluble in ethanol, n-butanol and 1:1 (v/v) toluene/ethanol solution and insoluble in neutral water.
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