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【答案】应助回帖
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mengfanbo: 金币+10, 翻译EPI+1, ★★★★★最佳答案 2013-06-10 16:38:53
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In this article the sweetpotato residue was chosen as raw material while the lactobacillus and the Aspergillus niger performed as the Fermentation Strains. The effects of fermentation time, inoculation quantity and ratio of material to liquid on extract rate of insoluble dietary fiber were investigated. In addition, a single factor experiment and an orthogonal experiment were carried out to optimize the preparation process of sweetpotato residue dietary fiber conducted by a microbe fermentation method.The results showed that 20 hours for fermentation, 1% quantity for inoculation and 1to 10 for the ratio of material to liquid could be concluded as the optimal process conditions of lactobacillus fermentation method. And the extract rate of IDF under these conditions was 12%. Besides above, the optimal process conditions of Aspergillus niger fermentation method were also determined and depicted as 96 hours, 5% and 1to 40 for fermentation, quantity for inoculation and ratio of material to liquid respectively. A 20% extract rate could be obtained within these conditions. The swelling force and the water-retaining capacity of the prepared sweetpotato dietary fiber were 2.8mL/g and 4.33g/g respectively of which the numbers were improved by 75% and 34.5 respectively compared with that of materials. In conclusion, not only the quality index of sweetpotato residue dietary fiber could be improved by a microbe fermentation method but also theoretical supports could be available for large scale preparation of it. |
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