Abstract
AbstractThree types of crystalline lactose hydrates having melting points (MP) of 218°C, 195°C and 169°C were crystallised from 680 ml litre−1 ethanol solution with a lactose to solvent ratio of 1:14‐1:24 at three pH values, ∼ 4, 2.5 and 1.3. The three types were characterised on the basis of their optical rotation, phase transition and X‐ray powder diffraction pattern. The samples with high and low MP were α‐lactose hydrates whereas that with the intermediate MP (195°C) was a hydrated lactose containing both α‐ and β‐forms.
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