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| Dietary fiber preparation from sweet potato by combinedtechnology of enzymolysis with alkaline hydrolysis |
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| Abstract: |
| In order to develop an optimal preparation procedure of dietary fiber from sweet potato that was red
picea yellow heart by combined technology of enzymolysis with alkaline hydrolysis， single factor and orthogonal array
design experiments were carried out and the properties of dietary fiber product were studied. The results showed
that the optimum preparation procedure was based on enzymolysis with addition of lipase of 0.5%， mixing enzyme
（α-maylase and glucoamylase）dose of 0.6%， papain of 0.2% alkaline hydrolysis for 1.5 h at 60℃with pH 8.5.
Under such conditions， the yield of dietary fiber could reach 66.31%， the contents of dietary fiber could increase from
24.21% in the raw materials to 83.74% in the soluble product. The swelling capacity， water holding capacity and oil
holding capacity of dietary fiber product was 6.23 mL/g， 9.33 g/g and 3.96 g/g respectively， the functional properties
were good. |
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