过氧化物漂白对蔗渣木聚糖提取的影响

Effect of Peroxide Bleaching Pretreatments on Xylan Extraction of Sugarcane Bagasse

比较了直接浸提和预处理后再浸提对蔗渣木聚糖提取率和产物的影响。蔗渣经过碱性过氧化氢或过氧乙酸的漂白预处理,有利于促进木聚糖的溶出和提高提取率,尤其是碱性过氧化氢的促进作用更显著,可以使木聚糖提取率达到21.5%(对干料),精制后产物纯度和白度分别达到85%和83%,但对于木聚糖纯度的提高并不是很显著。不同提取方式所得到的木聚糖在糖基组成和红外光谱图均有很高的相似度。

The effect of peroxide bleaching on xylan extraction, including the extracted amount from the solid res-idue, purity and whiteness was studied. The results suggested that the method with pretreatment using alkali peroxide or peracetic acid is more efficient than that of direct extraction. The best results were obtained with alkali-hydrogen peroxide pretreatment following by alkaline extraction. A final brightness of 83% , purity of 87% , and yields of 22% was obtained. Study also showed that alkali-hydrogen peroxide increased the broken points in polymers and facilitated xylan releasing. No significant difference in sugar composition was observed by FT-IR spectra detecting. Alkali hydro-gen peroxide pretreatment did not show obvious increase in the purity of product. The basic component and IR spectra from different treatment were very similar.