Abstract
A method for the determination of the optical purity of partially racemized samples of l-aspartic acid, based on the measurement of the pitch and handedness of cholesteric mesophases induced in MBBA ( p-methoxybenzylidene- p'-n-butylaniline), is described. The minimum quantity of aspartic acid required varies with the optical purity of the sample (from 50 μg for an enantiomeric purity of 10–20% down to 5 μg for purities around 90%).
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