Introduction of Microtech 5000/10000
The commercial application of phytase as feed additive was confirmed and accepted in animal industry. It was used to increase the efficiency of phosphorus in plant feed, decrease the environmental pollution, and reduce the anti-nutritional effects of phytic acid and its chelate. The Microtech 5000/10000 is the high-tech product which is designed through bioinformatics, DNA shuffling, high-throughput screening, liquid fermentation and dosage preparation technologies.
The high temperature resistant performance, acid resistance performance and pH adaptability were greatly improved in Microtech 5000/10000. In the feed industry, the bioavailability of phytate phosphorus was greatly increased by its excellent and stable catalysis.
Definition of Phytase Activity
One unit of phytate activity is defined as the amount of enzyme that releases 1 µmol phosphorus per minute from sodium phytate at 37◦C and pH 5.5.
Research and Development
Random mutation and selection
Heat-stable phytase mutant libraries was established through error prone PCR (EP-PCR), direct evolution and DNA shuffling. Heat resistance mutant was selected by high throughput screening.
On gene level, the 3D structure of heat-stable phytase was modeled by the software of Discovery Studio, Gromacs and Pymol. The potential active and high temperature resistance center were analyzed and predicted by molecular dynamics. After confirmed the mutagenized genes and the modified amino acid sequences by protein domain structure analysis, molecules in weak intermolecular interactions and unstable areas were replaced by heat-stable mutations. The phytase optimization was maintained through the enhanced compactness of the external surface and the stability of spatial structure on protein level. Through high temperature resistance screening, highly catalysis phytase at high temperature environment was obtained.
Depending on the excellent heat-stability performance and advanced dosage forms of the 4th generation phytase, there was no less of Microtech 5000/10000 relative activity after 5min water bath at 75◦C – 80◦C. The enzyme relative activity was more than 85% even in 85◦C of water bath for 5min.
After feed conditioning and pelleting, the Microtech 5000/10000 enzyme activity retention rate was maintained between 82% to 98%.
The Microtech 5000/10000 has wide range of pH adaptability and stability from pH 2 to 12, and insure its enzymolysis in monogastric animals.
The enzyme retention rates were 96.7% and 98.8% when Microtech 5000/10000 were treated with pepsase and trypsin for 120 mins, respectively. High anti-protease ability was shown in the tolerance test. Microtech 5000/10000 showed high tolerance to 14 kinds of metal ion solutions.
The efficiency of phytate phosphorus which was released from DDGS, corn, wheat and soybean meal were up to 705 when treated with Microtech 5000/10000 for 4 hours at 37◦C and pH 5.5.
Enzymes and carriers are mixed and spray dried to be mini-granular product by special dosage preparation technology to make sure its mobility and stability.
Application Effects on Broilers
Six hundred broilers (1 days of age) were randomly assigned to positive control (PC, corn-soybean based meal); negative control (NC, reducing 0.1% available phosphorus from corn-soybean based meal); and Treatment (Microtech, negative control diet with 100g/t Microtech 5000), respectively. After 42 days feeding trail, the results showed that the weight gain and FCR had no difference between PC and Microtech. The phosphorus digestibility was significantly increased (P < 0.05) by Microtech 5000. Our results indicated that Microtech 5000 could maintain broilers growth performance and nutrient digestibility even decreasing the dietary 0.1% of available P.
Compared with the NC group, Microtech 5000 significantly increased (P < 0.05) the tibial ash, calcium and phosphorus (P) contents. Broilers in PC group consumed higher (P < 0.05) amount of P than other two groups, and the P excretion was higher (P < 0.05) than NC and Microtech groups. The Microtech 5000 significantly decreased (P < 0.05) 26.67% of P excretion. These results suggested that Microtech 5000 excellently improved the P utilization efficiency.