Thermostable phytase enzyme
Are all phytases the same?
It is talking about the different phytases and their origin. First phytases market – Natutpphos, Ronozyme P, derived from different types of mushrooms (respectively Aspergillus niger var. Van tighen, formerly known as A. ficuum, and Peniophora lycii. Newest phytase VemoZyme NTP was obtained from Escherichia coli (bacteria) and shown its positive effect on productivity, bone mineralization and phosphorus utilization in birds. There are developed and other phytases originating from E.coli, but not yet received approval and are not available in the U.S..
In the gastrointestinal tract phytases is “soluble” only at low pH as solvent means that it is mixed with the aqueous phase of the intestinal contents. Precisely at this point can reach phytase and phytate phosphorus from secede. Approximately phytate pH 4 starts form insoluble precipitates cations (eg calcium, zinc, iron and copper). At pH 6 prevail insoluble phytate complexes. Upon birds ultimate solubility of phytate occurs in the glandular stomach and gizzard (stomach area). movements of gastric contents to the duodenum and later in the small intestine pH begins to rise. way in the small intestine excretion of phosphorus is the best in the duodenum. At the end of the small intestine is actually remaining phytate insoluble.
All phytases can seal off phosphorus from phytate molecule under suitable conditions. Commercial forms of phytases have been chosen to be active in practically levels of phytate during the selection process before marketing. However, you should know that in commercial forms of phytase their biochemical indicators are not necessarily identical. Overall, the effects of different phytases in poultry is influenced by biochemical factors such as pH profile, specific activity and resistance to the attacks of endogenous proteases.
Thermostability of the enzyme shows that it must be added by pulverizi-ing after pelleting or can be used as a direct additive to feed, but it does not affect the activity “in vivo”, when the enzyme is properly included in the feed (ie . was not inactivated by pelleting).
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