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Posted: 4/15/2021 - 0 comment(s) [ Comment ]
Category: Technology

The vitamin change in pelleting

Under the same pelleting time, as the temperature increases of feed pellet machine , the loss rate of most vitamins in the granulation process gradually increases.For most vitamin, the loss rate gradually increases as the granulation temperature increases. The loss rate of vitamin B12 has little change in the granulation process , The loss rate of vitamin B6 in the granulation process varies greatly. When the granulation time is 1min, the pelleting temperature increases from 71°C to 110°C and the loss rate increases from 25% to 70%.



The vitamin change in extrusion

Under the fixed extrusion time of fish feed extruder machine , when the temperature increases, the loss rate of various vitamins in the expansion process increases. The loss rate of vitamin B12 in the extrusion process changes little, The loss rate of vitamin B6 in the pelleting process varies greatly. After extrusion, the hydroperoxides, peroxides and cycloperoxides produced by the oxidation of lipids in pet food will cause the oxidation of vitamins A and E to produce peroxides, which will react Vitamin B6 with active carbonyl groups . The highly activated carbonyl produced by non-enzymatic browning of sugars also has a destructive effect on vitamins.



The vitamin change of storage period

Vitamin A, D, E, B1, B2, B6, and B12 have a large decrease after storage for 45 days, and vitamin E has a small decrease; vitamin E has a large decrease after storage for 90 days, and a small decrease It is vitamin B2. This may be because vitamin E has a strong antioxidant effect, which is an unsaturated fatty acid and is easy to decompose; while vitamin A and B2 are chemically stable, and under the influence of vitamin E's strong antioxidant effect, it is not easy to decompose and oxidize.

According to the different functional characteristics of various vitamins, we can add a certain proportion of multivitamins in pet food. By measuring the loss rate of vitamins during production such as extrusion and pelleting and the loss rate of vitamins during storage, it is found that the temperature With time changes, various vitamins have a certain degree of loss. Among them, granulation and expansion have a greater impact on vitamin B6, while storage time has a greater impact on fat-soluble vitamins (such as vitamin E).