Preparation of large crystals of N-benzyloxycarbonyl-L-aspartic acid
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United States of America Patent
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Feb 11, 1986
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N/A
app pub date -
Aug 26, 1983
filing date -
Aug 26, 1983
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Expired
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Abstract
N-Benzyloxycarbonyl-L-aspartic acid (Z-Asp) crystals several times larger than those obtained by conventional crystallization are prepared by acidifying an alkaline aqueous solution of a metal salt of Z-Asp at high temperatures of between about 20.degree. to 45.degree. C. The resulting large crystals contain less moisture and less impurities such as sodium chloride, dipeptide and benzyl alcohol, etc. than those crystals obtained at lower temperatures and they are easily processed for preparing aspartame.
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