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Enzyme activities in activated sludge flocs

机译：活性污泥絮凝物中的酶活性

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This study quantified the activities of enzymes in extracellular polymeric substances ( EPS) and in pellets. Seven commonly adopted extraction schemes were utilized to extract from aerobic flocs the contained EPS, which were further categorized into loosely bound ( LB) and tightly bound ( TB) fractions. Ultrasonication effectively extracted the EPS from sludge flocs. Enzyme assay tests showed that the protease activity was localized mainly on the pellets, amylase and alpha-glucosidase activities were largely bound with LB-EPS, and few protease, alpha-amylase, or alpha-glucosidase activities were associated with the TB-EPS fraction. There exists no correlation between the biochemical compositions of EPS and the distribution of enzyme activities in the sludge matrix. The 44-65% of alpha-amylase and 59-100% of alpha-glucosidase activities noted with the LB-EPS indicate heterogeneous hydrolysis patterns in the sludge flocs with proteins and carbohydrates.
机译：这项研究量化了细胞外聚合物（EPS）和颗粒中酶的活性。七个常用的提取方案用于从需氧絮凝物中提取所含EPS，将其进一步分为松散结合（LB）和紧密结合（TB）组分。超声处理可有效地从污泥絮体中提取EPS。酶分析测试表明，蛋白酶活性主要集中在沉淀物上，淀粉酶和α-葡萄糖苷酶的活性主要与LB-EPS结合，很少有蛋白酶，α-淀粉酶或α-葡萄糖苷酶的活性与TB-EPS组分相关。 EPS的生化组成与污泥基质中酶活性的分布之间没有相关性。 LB-EPS记录的44-65％的α-淀粉酶活性和59-100％的α-葡萄糖苷酶活性表明污泥絮凝物中具有蛋白质和碳水化合物的非均质水解模式。

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