Comparison of selected physicochemical characteristics of commercial phytases relevant to their application in phosphate pollution abatement

被引：0
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作者：
Boyce, A. [1 ]
Walsh, G. [1 ]
机构：
[1] Department of Chemical and Environmental Sciences, University of Limerick, Limerick City, Ireland
来源：
Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering | 2006年 / 41卷 / 05期
关键词：
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°C 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°C 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. Copyright © Taylor & Francis Group; LLC;
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页码：789 / 798
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