Production of ethanol and isoflavones from steam-pretreated Radix Puerariae by solid state fermentation.
- Author:
Xiaoguo FU
1
;
Hongzhang CHEN
;
Weidong WANG
Author Information
1. Key State Laboratory of Biochemical Engineering Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
- Publication Type:Journal Article
- MeSH:
Cellulase;
metabolism;
Ethanol;
metabolism;
Fermentation;
physiology;
Glucan 1,4-alpha-Glucosidase;
metabolism;
Isoflavones;
biosynthesis;
Pueraria;
metabolism;
Steam;
Yeasts;
metabolism
- From:
Chinese Journal of Biotechnology
2008;24(6):957-961
- CountryChina
- Language:Chinese
-
Abstract:
The gelatinization process of the starch is replaced by unpolluted steam-pretreatment on the base of the Radix Puerariae rich in fiber and isoflavones. The production of ethanol and isoflavones by simultaneous saccharification and solid state fermentation (SSF) of steam-pretreatment Radix Puerariae is presented. The optimal technological conditions were obtained: Radix Puerariae being steam-pretreated at a saturated vapor pressure of 0.8 MPa for 3.5 min, glucoamylase(65 u/g), cellulase(1.5 u/g), 0.1%(NH4)2SO4, 0.1%KH2PO4 and activated yeasts being added in, and fermentation at 35-37 degrees C for 60 h. Under these conditions, the yield of ethanol and isoflavones from 100 g Radix Pureriae (dry basis) were 27.47 g and 4.43 g, respectively, the starch utilization rate was 95%. In comparison with the traditional fermentation technology, the simultaneous saccharification and SSF of steam-pretreatment Radix Puerariae is clean and energy-saving. It provides new way of the production of ethanol from the non-food starch material, and worthwhile to be explored and implemented in industry.
