Title: Small-angle neutron scattering studies of starch granule structure
Abstract: Starch granules from the potato, wheat, barley, millet, waxy maize, mung bean, smooth pea and wrinkled pea have been examined as slurries in D2O by the technique of small-angle neutron scattering (SANS). All starches except that from wrinkled peas exhibit a Bragg peak at 100 Å approximately but this disappears on gelatinization. The Bragg peak is believed to arise from alternating amorphous and crystalline regions. By the use of different D2OH2O mixtures, the isopicnic point was shown experimentally to occur at 52% D2O w/w which was close to that calculated theoretically (50·4% D2O w/w). Examination of native and defatted wheat starches in an isopicnic D2OH2O mixture showed evidence of a lipid peak at 152–167 Å. On the basis of this evidence and that from Debye-Scherrer broadening of the 100 Å peak it is proposed that the lipid occurs radially. Further evidence in support of these dimensions and conclusions comes from Guinier analyses of the gelatinized starch granules. Using the racemose model for amylopectin, then each raceme was found to fit optimally the SANS scattering data when it was assumed to be either a squat cylinder or ellipsoid with dimensions of 150 × 60 Å.
Publication Year: 1984
Publication Date: 1984-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 64
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