碱性木聚糖酶研究进展*

木聚糖是一种在自然界中含量仅次于纤维素的丰富的可再生资源,木聚糖酶是一类可以将木聚糖水解成单糖和寡糖的酶,利用木聚糖酶将木聚糖分解后的产物被广泛应用于食品、造纸以及纺织等行业。木聚糖酶按其对酸碱环境的耐受能力分为碱性木聚糖酶、中性木聚糖酶和酸性木聚糖酶,其中碱性木聚糖酶适合应用于造纸工业中,尤其在造纸的制浆、促进漂白及废纸脱墨等多种工艺中,可以显著提高纸张质量,有效降低氯气排放量,从而减少对环境的污染。随着生物技术的进步,利用基因工程技术可以对碱性木聚糖酶进行分子改造,以提高其耐碱、耐热能力,扩大其在工业应用中的条件范围。介绍碱性木聚糖酶在分子改造方面的研究进展以及其在造纸漂白和制浆、废纸脱墨中的应用。

Research Progress of Alkaline Xylanase

Xylan is an abundant renewable resource in nature, the content of which is second only to cellulose. Xylanase is a kind of enzyme that can hydrolyze xylan into monosaccharides and oligosaccharides. The products decomposed by xylanase can be widely used in food, papermaking, textile and other industries. Xylanase can be divided into alkaline xylanase, neutral xylanase and acidic xylanase according to its tolerance to acid-base environment. Alkaline xylanase is suitable for paper industry, especially in various processes such as pulping, bleaching and waste paper deinking, which can significantly improve paper quality, effectively reduce chlorine emission, and reduce environmental pollution. With the progress of biotechnology, the molecular modification of alkaline xylanase can be carried out by means of genetic engineering, so as to improve its alkali resistance and heat resistance and expand its condition range in industrial application. This paper introduces the research progress of alkaline xylanase in molecular modification, and briefly introduces its applications in pulping, bleaching and waste deinking.