Method of preparing .alpha.-l-aspartyl-l-phenylalanine...

Details Method of preparing .alpha.-l-aspartyl-l-phenylalanine... Method of preparing .alpha.-l-aspartyl-l-phenylalanine...

C - Chemistry, Metallurgy

07

K

C07K 5/075 (2006.01) C07K 1/14 (2006.01) C07K 5/072 (2006.01)

Patent

CA 2069257

An acid addition salt of .alpha.-APM is dissolved or suspended in an aqueous medium at 50°C or lower at a pH of 3 or less and a concentration of the salt of 3 wt.% or more. A liquid having a pH of 3 or more and containing or not containing .alpha.- APM is prepared and gradually mixed with solution A with stirring. The temperature of the liquid mixture is kept to be 40°C or lower and the pH value of the mixture is kept at 3 or more, optionally adding a base thereto, whereby crystals of .alpha.- APM are precipitated out.

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