堿處理中溫度對(duì)不同底物特性木質(zhì)纖維素結(jié)構(gòu)及酶解的影響
[Abstract]:In order to study the effect of temperature on lignocellulose structure and enzymatic hydrolysis efficiency of different substrate properties in alkaline pretreatment, Caragana (Caragana korshinskii Kom,), rice straw and wheat straw were used as raw materials. NaOH solution was pretreated at room temperature and high temperature, and analyzed by scanning electron microscope (SEM). Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were used to analyze the surface morphology, chemical composition and crystallinity of lignocellulose. The results of SEM and component analysis showed that alkali treatment of NaOH solution could effectively remove lignin from lignocellulose and destroy the dense physical structure. After treated with NaOH solution, lignin structure of Caragana korshinskii, rice straw and wheat straw was destroyed to a certain extent, and some functional groups such as hydroxyl, methylene, methoxy and ester bond were broken, the results of XRD analysis and enzymatic hydrolysis showed that, Alkali treatment can destroy the crystalline region of lignocellulose material, increase the porosity and internal surface area of the raw material, thus increase the accessibility of cellulase and the conversion rate of enzymatic hydrolysis. After 24 h enzymatic hydrolysis, Alkali treatment at high temperature can make the conversion rate of rice straw dextran up to 94.877.Among them, temperature, as an important factor, affects the effect of alkali treatment of NaOH solution. When the temperature increases, the effect of alkali treatment of NaOH solution on the removal of lignin is better. The physical structure of the substrate was destroyed more seriously, so increasing the temperature would promote the effect of alkali treatment in NaOH solution.
【作者單位】: 天津科技大學(xué)生物工程學(xué)院/工業(yè)發(fā)酵微生物教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】:公益性行業(yè)(農(nóng)業(yè))科研專項(xiàng)(編號(hào):201503135-15)
【分類號(hào)】:O636.11
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