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Article | 11.04.2021
A phytase is sensitive to external stresses like heat and humidity during storage, and also to other aggressive feed compounds, for instance when mixed into a vitamin/mineral mix. Therefore, storage tests of phytases need to be conducted to assess their stability when stored as a product or when stored in a premix.
OptiPhos® Plus G, CT and L demonstrate long shelf life
Shelf life is determined by defining the time point when more than 20% activity has been lost. The shelf life of OptiPhos® Plus granular (G), coated (CT) and liquid (L) were evaluated during incubation at a constant temperature of 25 ± 2 oC and 60 ± 5% humidity.
The results indicated that OptiPhos® Plus G and CT have a shelf life of at least 24 months, showing recoveries which were above 90% (Figure 1).
OptiPhos® Plus L was incubated and showed a recovery of 90% after 12 months (Figure 1).
Figure 1. Recoveries over time of OptiPhos® Plus G, CT and L incubated at 25 oC
OptiPhos® Plus stability in a concentrated premix
OptiPhos® Plus G and CT were mixed into a very concentrated vitamin/mineral mix (0.1% premix) containing 250 g/kg choline chloride (known as the most aggressive compound in premixes). Despite this very aggressive environment, OptiPhos® Plus G and CT demonstrated recoveries of 87% and 92%, respectively after 6 months incubation at 25 oC (Figure 2). This demonstrates that OptiPhos® Plus G, a mainstream choice of phytase form, is very stable in premix.
Figure 2. Recoveries of OptiPhos® Plus G and CT in a concentrated vitamin/mineral blend incubated at 25 oC for 3 and 6 months
Advantages of high stability of OptiPhos® Plus
This high stability of OptiPhos® Plus reduces the risk of substantial activity losses during storage, avoiding final feeds which are deficient in phosphorus. In particular, the fact that OptiPhos® Plus G and CT are very stable when blended into an aggressive and concentrated premix makes it the ideal phytase to be used for companies active in the export of concentrated premixes.
Product mentioned in this article
OptiPhos® Plus is the latest generation, most thermostable phytase on the market. OptiPhos® Plus has improved thermostability and shows robust and reliable matrix values.
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