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首页> 外文期刊>Journal of Environmental Engineering >Characterization of exocellular protein and its role in bioflocculation
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Characterization of exocellular protein and its role in bioflocculation

机译:胞外蛋白的表征及其在生物絮凝中的作用

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摘要

The relationship between exocellular biopolymer concentration and cation concentration was examined using laboratory scale activated sludge reactors with bactopeptone as a feed. An increase in the divalent cation concentration in the feed to the reactors was associated with an increase in the bound exocellular protein concentration, and high sodium concentrations resulted in a decrease in the bound protein concentration. The changes in bound biopolymer were explained according to the cation bridging model. Incubation of a laboratory activated sludge with a proteolytic enzyme resulted in deflocculation of the suspension as measured by an increase in the number of particles in the 5-40 mu m range, which suggested that the exocellular protein was strongly involved in the aggregation of bacteria into flocs. SDS PAGE results revealed the presence of a single protein in the exocellular biopolymer extract from municipal, industrial, and laboratory activated sludge samples. The molecular weight of the protein was approximately 15 daltons. Amino acid analysis and amino acid sequencing results suggested the protein was a lectinlike protein, and binding site inhibition studies demonstrated that the protein had lectinlike activity.
机译:使用以细菌素为原料的实验室规模的活性污泥反应器,检查了胞外生物聚合物浓度与阳离子浓度之间的关系。反应器进料中二价阳离子浓度的增加与结合的胞外蛋白质浓度的增加有关,高钠浓度导致结合的蛋白质浓度降低。根据阳离子桥联模型解释了结合的生物聚合物的变化。实验室活化的污泥与蛋白水解酶的孵育导致悬浮液解絮凝,这通过5-40μm范围内的颗粒数量增加来衡量,这表明胞外蛋白强烈参与了细菌向絮状物。 SDS PAGE结果显示,市政,工业和实验室活化污泥样品的细胞外生物聚合物提取物中存在单一蛋白质。该蛋白质的分子量约为15道尔顿。氨基酸分析和氨基酸测序结果表明该蛋白是一种凝集素样蛋白,结合位点抑制研究表明该蛋白具有凝集素样活性。

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