Thisstudyexploredtheinfluencesofenvelopeintegrityofcookedstarchgranulesonphysicochemicaland
thermophysical properties of mungbean and cassava starches. Alkali treatment was used to selectively
leach amylose from the amorphous region of both starches and partially fragmented starch molecules
intolower-molecular-weightpolymers.Itwas foundthatdespitethelossof40%oftheoriginal contentof
amylose,bothmungbeanandcassavastarches retainedsimilarcrystallinities,gelatinizationtemperature
ranges, and pasting profiles compared to the native starches. However,the loss of granule-bound starch
synthases during alkalitreatment and subsequent alkali cooking in excess water played significant roles
in determining granular disintegration. The alterations in envelope integrity due to the negative charge
repulsion among polymers within the envelope of swollen granules, and the fragmentation of starch
molecules, were responsible for the alterations in thermophysical properties of mungbean and cassava
starches cooked under alkaline conditions.
©
Thisstudyexploredtheinfluencesofenvelopeintegrityofcookedstarchgranulesonphysicochemicaland
thermophysical properties of mungbean and cassava starches. Alkali treatment was used to selectively
leach amylose from the amorphous region of both starches and partially fragmented starch molecules
intolower-molecular-weightpolymers.Itwas foundthatdespitethelossof40%oftheoriginal contentof
amylose,bothmungbeanandcassavastarches retainedsimilarcrystallinities,gelatinizationtemperature
ranges, and pasting profiles compared to the native starches. However,the loss of granule-bound starch
synthases during alkalitreatment and subsequent alkali cooking in excess water played significant roles
in determining granular disintegration. The alterations in envelope integrity due to the negative charge
repulsion among polymers within the envelope of swollen granules, and the fragmentation of starch
molecules, were responsible for the alterations in thermophysical properties of mungbean and cassava
starches cooked under alkaline conditions.
©
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