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Glucose and Fructose Adsorption on Sucrose Crystals. Their Role as Habit‐Modifiers
Author(s) -
Sgualdino G.,
Vaccari G.,
Mantovani G.,
Aquilano D.
Publication year - 1997
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170320807
Subject(s) - fructose , sucrose , monosaccharide , chemistry , crystal habit , adsorption , selectivity , aqueous solution , impurity , crystal (programming language) , crystallography , molecule , inorganic chemistry , organic chemistry , crystallization , catalysis , programming language , computer science
Experimental evidences show that α‐D‐glucose and β‐D‐fructose work as habit‐modifiers of sucrose crystals grown from aqueous solutions at high concentration only. Their ability to affect the sucrose habit is examined from structural point of view, through stereochemical analysis of both additive molecules and surface sites on some significant polar and non‐polar forms of sucrose crystal. We referred to the classical TLK (terraces, ledges, kinks) model and restricted the adsorption interactions to the H‐bondings only. Notwithstanding the simple qualitative model we adopted, our method of analysis appears satisfactory to interpret analogies and differences in selectivity between glucose and fructose. However, it is not able to explain why the additive concentrations, needed to induce macroscopic effects. are so high. To clear this aspect, we assumed a behaviour as “disruption tailor‐made additives” for both monosaccharides. Finally, sucrose crystals grown in the presence of equimolecular mixture of glucose and fructose (50 + 50 g/100 g H 2 O), examined by X‐ray powder diffractometry, show the systematic splitting of main diffraction peaks; the systematic effect reveals the influence of both impurities on the bulk structure of sucrose crystal.