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Characterisation of lactose crystallised in acidified aqueous ethanol
Author(s) -
Singh Rakesh K,
Shah Basant B
Publication year - 1992
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740580129
Subject(s) - lactose , chemistry , solvent , aqueous solution , ethanol , melting point , powder diffraction , crystallography , nuclear chemistry , organic chemistry
Three 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.