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Preparation of low digestible and viscoelastic tigernut (Cyperus esculentus) starch by Bacillus acidopullulyticus pullulanase.
International Journal of Biological Macromolecules 2017 September
Tigernut starch is an underutilized food resource. In this study, pullulanase (PUL) hydrolysis was used to change its physiochemical properties for different food applications. The content of low digestible fractions, resistant starch and slow digestible starch, in PUL modified tigernut starch significantly increased from 2.03% to 25.08% (P<0.05) using 100U/g starch of PUL in the debranching reaction. The paste or dispersion of PUL modified tigernut starch had a significantly decreased viscoelasticity (P<0.05), but the paste still exhibited a typical property of pseudoplasticity. Molecular weight, amylopectin A B2 and B3 chain of PUL modified starch were lower, while amylose content, amylopectin B1 chain were higher than those of natural tigernut starch. The low digestible and viscous tigernut starch is highly valued as a component in some functional foods.
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