The effects of the catalyst used in acetylation, including sodium hydroxide (NaOH), potassium hydroxide (KOH), and calcium hydroxide (Ca(OH)2), on the chemical and physicochemical properties of acetylated waxy maize starch were investigated. The Ca(OH)2-catalyzed acetylated starch exhibited a slightly higher pasting temperature and a lower β-amylolysis limit compared with acetylated starch prepared under NaOH or KOH catalysis, but no difference was observed for their thermal properties. The carbohydrate profiles of isoamylase-debranched acetylated starches and their β-limit dextrins were characterized by high-performance size-exclusion chromatography. The Ca(OH)2-catalyzed acetylated starch showed a elution profile that was different from those of the other two acetylated starches with a greater proportion of saccharides eluted at a longer retention time. However, the differences in pasting temperature, β-amylolysis limit, and carbohydrate profile among the acetylated starches diminished when ethylenediaminetetraacetic acid (EDTA) was added. The results suggest that calcium might induce intermolecular crosslinking through chelation with oxygen of the anhydroglucose units and this type of crosslinking was promoted in acetylation catalyzed by Ca(OH)2.
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Wang et al. (2002) studied this question.
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