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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Comparison of Selected Physicochemical Characteristics of Commercial Phytases Relevant to their Application in Phosphate Pollution Abatement
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Comparison of Selected Physicochemical Characteristics of Commercial Phytases Relevant to their Application in Phosphate Pollution Abatement

机译：商业化植酸酶的某些理化特性与其在磷酸盐污染消除中的应用的比较

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摘要

The enzyme phytase catalyses the dephosphorylation of phytic acid and it's salts, phytates. Supplementation of monogastric animal feed with microbial-derived phytase increases the bioavailability of phytic acid bound phosphate. This facilitates a reduction in the addition of inorganic phosphate to the feed and reduces phosphorus excretion. To achieve maximum efficacy in terms of phosphate pollution abatement, supplemental phytases added to animal feed must survive thermal processing of the feed, resist inactivation by the proteolytic enzymes encountered in the animal's digestive tract and display high activity at physiological temperature and pH. A series of in vitro experiments were carried out to determine the relative suitability of four major commercial phytase products for use in animal feed. The enzymes assessed lost between 14% and 72% of their original activities after heating to 80℃ for 5 minutes. After exposure to simulated upper digestive tract conditions, the phytases assessed retained between 0 and 28% of their original activities. The commercial phytases displayed between 98% and 67% of their maximum activities at 39℃ and all phytases assessed had an optimum pH between pH 4 and pH 5. None of the phytases assessed satisfied all of the criteria of an ideal phytase for use in animal feed.
机译：植酸酶催化植酸及其盐，植酸盐的去磷酸化。单胃动物饲料中补充微生物来源的植酸酶可增加植酸结合磷酸盐的生物利用度。这有助于减少进料中无机磷酸盐的添加并减少磷的排泄。为了在消除磷酸盐污染方面达到最大功效，添加到动物饲料中的肌醇六磷酸酶必须在饲料的热加工过程中存活下来，抵抗动物消化道中遇到的蛋白水解酶的失活，并在生理温度和pH值下表现出高活性。进行了一系列的体外实验，以确定四种主要的商业植酸酶产品用于动物饲料的相对适用性。加热至80℃5分钟后，所评估的酶丧失了其原始活性的14％至72％。暴露于模拟的上消化道条件后，所评估的植酸酶保留其原始活性的0％至28％。商业植酸酶在39℃时表现出其最大活性的98％至67％，所有被评估的植酸酶的最佳pH都在pH 4和pH 5之间。被评估的植酸酶均未满足用于动物的理想植酸酶的所有标准。饲料。

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