Analysis Of Degradation Products And Structural Characterization Of Pretreated Reed Straw And Chinese Silver Grass By⁶⁰Co-γ Irradiation

Utilization of lignocellulosic biomass fuel ethanol, can effectively solve the problem of fuel ethanol is the high cost of raw materials, raw materials Co., etc.. But because of the natural lignocellulose has complex structure, enzyme reaction and degree is low, so it is difficult to saccharification and fermentation preparation of fuel ethanol. Therefore, must carry on the pretreatment of lignocellulosic feedstocks, increasing the cellulose reaction accessibility. Irradiation as a physical means, to break the structure of cellulose, cellulose reactivity increases, improve fermentable sugar yield. Irradiation as a physical means, to break the structure of cellulose, cellulose reactivity increases, improve fermentable sugar yield.In this study, reeds, grass straw lignocellulose as the research object, using the6OCo gamma ray irradiation processing technology, of lignocellulose in0～2000kGy irradiation dose pretreatment, degraded and microstructure. The main results are as follows:1. Irradiation promote reed grass, cellulose, hemicellulose degradation decomposition. After irradiation, the degradation of2000kGy, reeds and Chinese silver grass in hemicellulose rate were79.86%and95.76%; Degradation of cellulose reeds and Chinese silver grass in the rates were83.07%and53.28%. Irradiation on the degradation of lignin reeds, grass is smaller, the degradation rate was less than20%. Different doses of irradiation of reed in the water extract of glucose, xylose, glucose, galactose, fiber Arabia two sugar, galacturonic acid, glucuronic acid7kinds of sugar content was higher than that of Chinese silver grass. Reed water extract, two sugar glucose in fiber in2000kGy relative content were19.28±0.02mg/g,100.59±0.03mg/g. Chinese silver grass sinensis extract in2000kGy glucose, fiber two sugar content were17.94±0.02mg/g,63.47±0.02mg/g.2The irradiation process, cellulose, hemicellulose, lignin degradation, in addition to generating fermentable sugar outside, also generates a range of by-products. Reed from the water extract of ethyl acetate extract identified42kinds of fatty acids,27aromatic compounds and7kinds of furan compounds. But only identified26kinds of fatty acids,22aromatic compounds and3kinds of furan compounds from Chinese silver grass. 3IR peak irradiation reed grass, the spectra are similar, the peak position changed little, peak strength decrease. The effect of irradiation on the cellulose crystalline structure is also obvious. After2000kGy irradiation crystallization of Chinese silver grass degree was reduced from48.72%to21.68%, and the reed crystallinity decreased from47.15%to39.53%, a drop of only7.62%. That is easier to break the irradiated crystalline structure of Chinese silver grass. Reed, Chinese silver grass overall morphology in irradiation can greatly damage, from the smooth surface, compact becomes rough, rugged, and holes, surface scaly shedding, the morphology features of the original are lost in2000kGy.