In this study, the quality properties of fresh noodles with tea polyphenols (TPs), including rheological and texture properties, were characterised. The changes of gluten protein second structure, free thiol group (-SH) content and TPs content were evaluated in fresh noodles during storage time. The results showed that the flour farinograph and extensograph properties could be improved by 0.9% TPs. All of textural parameters exhibited significant decrease (P < 0.05) along with the storage time, including hardness, springiness and tensile force of fresh noodles, while the shelf life of noodles containing TPs was longer than that of non-TPs noodles. In addition, TPs inhibited the transformation of glutenin macropolymer (GMP) into SDS-soluble glutenin in the fresh noodles. Furthermore, the increase in free thiol group, the decrease of a-helix structure and the change of TPs content mostly occurred during the first 9 days. These results indicated that TPs could prolong the shelf life of fresh noodles.
Peroxide-acetic acid (Peroxide-HAc) pretreatment is a simplified and cost-effective technology due to its mild conditions without the catalysis of strong acids, which was introduced to treat sugarcane bagasse (SCB) in this paper. Then pretreated SCB was used to produce bioethanol using
thermophilic Saccharomyces cerevisiae in deionized water (DW) and sodium citrate buffer solution (SCS) fermentation systems, respectively. Results: showed that peroxide-HAc pretreatment can selectively remove lignin and change morphological structures, thus positively increasing
saccharification and fermentation efficiency downstream. SCB pretreated at 100 °C obtained the lowest residual lignin content of 2.88% and achieved the highest ethanol yield of 92.10% (0.45 g/g-biomass) in DW system. In particular, SCS can decrease the residual sugars content of pretreated
SCB during simultaneous saccharification and co-fermentation (SSCF) process. The addition of Tween 80 improved SSCF of SCB pretreated at 80 °C likely because Tween 80 can block residual lignin adsorption with enzymes. The concentration of acetic acid and glycerol byproducts from SCB pretreated
at 80 °C can be decreased by SCS and DW systems, respectively, comparing to SCS and DW systems with additing Tween 80. This study provided a systematic process route for the bioethanol production by mild pretreatment method.
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