In the process of feed processing, whether it is a small extrusion machine or a large food extrusion machine. Some heat-sensitive nutrients in feed, such as vitamins, enzyme preparations, live bacteria preparations and some flavor substances, will lose a large part of their activity due to the influence of high temperature, extrusion, grinding and other factors in the processing process.
Under the normal granulation condition of food extrusion machine, vitamin loss is generally more than 10%. Loss of live bacteria in the granulation process: the main live bacteria added in the feed are lactic acid bacteria, streptococcus, bacillus and yeast, and their stability in the granulation process is very different. The loss of active yeast cells was particularly great, and almost no active cells existed.
Loss of heat sensitive components during expansion
1. Vitamin loss in the extrusion process of feed extruder Temperature, pressure, friction and moisture will lead to vitamin loss. The loss of vitamin A, vitamin D3 and folic acid was about 11% in the feed puffed at 120℃.
2. The loss of enzyme preparation in the extrusion process is usually up to 120~150℃, higher than the granulation temperature, under such conditions most enzyme preparation will completely lose their activity, at 110℃, phytase activity retention rate is zero; The activity of β-glucanase and cellulase could not be measured at 110℃.
3. Loss of live agents during extrusion The loss of live agents during extrusion is much greater than the loss under granulation. The extrusion temperature above 120℃ will cause the activity of lactobacillus, streptococcus, bacillus and yeast which are widely used at present to lose all.
Ji 'nan FLD food extrusion machinery recommendations in the feed processing process should pay attention to the following points:
1. Control the processing temperature and do not affect the additive activity too much.
2. Reduce the amount of water used, can in dry out.
3. The grinding particle size is moderate, too large will affect ripening and digestion, and too fine will affect the normal operation of the digestive system.
4. At the same time, the loss control of feed nutrition. Pay attention to the authenticity of the nutrition of the purchase, do not purchase defective products. Storage time should not be long, will also affect nutrition. Summer time should be short, winter time can be extended in due course.
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