Modification of maize starch by thermal processing in glacial acetic acid
2000
Shogren, R.L.
Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) methods were used to determine if corn starch-glacial acetic acid mixtures can be melted and thermally processed at reasonable temperatures. DSC studies showed that the melting temperature of dry starch was reduced from about 280 to 180degreeC in the presence of >30% acetic acid. Glass transition temperatures varied from 110 to 40degreeC at 15 and 45% acetic acid, respectively. XRD showed the loss of native starch crystallinity and the formation of V-type complexes. Addition of 10% water decreased the melting temperatures to 140-150degreeC while addition of a base (sodium acetate) had little effect. Some possible applications of processing starch in glacial acetic acid will be discussed.
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