LIMA Fish Feed Machine,Chicken Feed Machine
Because the amount of phytase usage is about 20% of the amount of commercial enzyme preparation, the study of phytase thermal stability is quite large (Bedford and Schulze, 1998). The reason why it is probably, which may be embarrassing acids in many vegetative feed raw materials, which makes phosphorus and other nutrients are difficult to absorb and utilize because of the presence of phosphorus (CHERYAN, 1980; EECKHOUT and DEPAEPE, 1994; Ravindran, 1995) . However, endogenous phytases in a single stomach animal lack activity or activity (Pallauf and Rimbach, 1997). More complicated, the plants of the same phytic acid also contain a considerable number of phosphatases, and phosphorus digestive nutritional problems are interleaved with each other. Phosphorus pollution has become a restriction factor in the production of holycatal and poultry. 46U China Feed Industry Information Network – Based on Feed, Service Animal Husbandry
The source of phytase is wide, and its characteristics are also different. LiU et al. (1998) reviewed the document before 1998. The results show that the most active temperature from bacteria, fungi, yeast and plant, is 45 to 77 degrees Celsius, which is different from 32 degrees Celsius. DVORAKOVA et al. (1997) describe the phytase properties separated from Aspergillus Niger. The phytase has an activity in the temperature range of 25 to 65 degrees Celsius, and its optimum temperature is 55 degrees Celsius; it is cultured at 60 degrees Celsius for 10 minutes to lose 5%, while in 80 degrees Celsius for 10 minutes. The initial activity lost 80%. As a part of a heat-resistant enzyme, WYSS et al. (1998) were studied against heat denaturation from the purified phytase separated from a. fumigatus and Aspergillus (A. NiGe). These two sources of phytases are denatured at as low as 55 degrees Celsius. However, when the temperature is increased to 90 degrees Celsius, the phytase from the A. Fumigatus is again folded into an active configuration, but the phytase from Aspergillus (A. NiGe) does not matter. Undoubtedly, some heat resistance phytase will be put into commercial use in the near future. 46U China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry
The enzyme in the solution is inactive, and does not indicate that the enzyme in the feed is also inactivated, which is because of the feed. The enzyme is interactive with the feed matrix. In fact, the feed feedstock can protect the enzyme from steam or high temperature in a short period of time (Chesson, 1993). Determination of phytase activity in particulate feed enzyme activity provides more accurate data. Simons et al. (1990) addition of phytase to ldquo; General Pig Feed RdquO; medium, the feed is heated to 50 degrees Celsius or 65 degrees Celsius prior to granulation. The results show that the temperature of 78 degrees Celsius or 81 degrees Celsius is heated to 50 degrees Celsius, and the activity of the enzyme is not reduced at this time; however, when heated to 65 degrees Celsius, the temperature reaches 84 degrees Celsius or 87 degrees Celsius, at this time, the enzyme is made The activity loss is 17% or 54%. Gibson (1995) adds 3 plantase preparations in wheat base diet, and is made of particulate feed at 65 to 95 degrees Celsius. The results showed that 2 plant acid enzyme preparations were inactive at 65 degrees Celsius granulation temperature, and only 1 plant acid enzyme preparation reserved considerable amounts of activity at 85 degrees Celsius or more. In addition to the stability of the study enzyme in solution, WYSS or the like (1998) is also added to the merchanease isolated from the cigarette and black cream to the product feed before granulation (75 degrees Celsius or 85 degrees Celsius). The results show that when the granulation temperature is 75 degrees Celsius, the active recovery rate of the two phytases in the particulate feed is similar; however, when the granulation temperature is 85 degrees Celsius, the phytase activity from aspergillus is from the smoke. The phytic acid enzyme activity of Aspergillus has to lose more, which also supports their research results of denaturation kinetics. EECKHOUT et al. (1995) added a commercial phytase formulation to the feed, indicating that the granulation temperature of 69 to 74 degrees Celsius can lose 50% to 65%. 46U China Feed Industry Information Network – Based on Feed, Service Animal Husbandry
The action not only affects the effects of microbial enzymes added to the feed, but also affects the naturally occurring enzyme in feed raw materials. The role of the class. Gibson (1995) found that granulation at 85 degrees Celsius will make the endogenous investigative phytase activity in wheat inactivation. EECKHOUT and DEPAEPE (1994) reported in the survey of phytase activity in different feeds, wheat bran is a phytase, but the phytase activity of the granulation sample is only 56% of the unsuccessful sample. JongBloed and Kemme (1990) found that granulation in close proximity to 80 degrees Celsius can reduce the activity of phytase in pig feed, where the pig feed is formulated in a feed raw material that is rich or lack of phyase activity. of. They also conducted a test to determine the effects of apparent absorption rate of granulation on phosphorus. They were found in two experiments that the absorption rate of phosphorizine-rich feedmeated feed was reduced, which was consistent with the results of endogenous phytase inactivation. 46U China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry
The attention of the feed industry on the research of phytase stability is due to the current machining temperature High, and the absorption rate of phosphorus due to nutrients and environmental factors is increasingly important. Exogenous enzymes increase the encapsulating or formation of granules, which provides a method for the current protective enzyme from thermal damage. More basicThe method may be the separation of heat resistance enzymes or reducing it to the active configuration after enzyme degeneration.Another unfortunately, these methods do not prevent high temperature damage to endogenous enzymes contained in feed raw materials. 46U China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry
