An obstacle in preparing alloisoleucine.
Alloisoleucine, prepared from a mixture of racemic isoleucine-alloisoleucine diastereoisomers, can be heavily contaminated with isoleucine if the recrystallization of acetyl-dl-alloisoleucine is controlled by melting point only. Two commercial specimens were found to be thus contaminated.
D003460:Crystallization; D007532:Isoleucine / Q000302:isolation & purification*; D013237:Stereoisomerism
D007532:Isoleucine