Method for reducing toxins in edible alcohol byproduct DDGS (distillers dried grains with soluble) feed

Abstract

The invention discloses a method for reducing toxins in edible alcohol byproduct DDGS feed, which comprises the following steps: 1) drying and crushing corn, adding amylase and peroxydehydrogenase for mixing, and adding water for preheating; (2) preheating to 45 DEG C from 30 DEG C, and standing for 2 hours; (3) continuing to heat to 105 DEG C for liquefying, cooling to 60 DEG C through flash evaporation, and adding saccharifying enzyme for saccharifying; 4) adding yeast which contains lactic acid bacteria, and fermenting in a fermentation tank for 70 hours; 5) rectifying the fermented mash through a tower kettle, cooling the vinasse liquid in the tower kettle to be lower than 40 DEG C, adding lactic acid bacteria, and fermenting at 35 DEG C for 2 hours, and 6) centrifugally drying after fermentation to obtain the DDGS feed with low toxin content. The toxin content in the DDGS feed treated by the method is as follows: gibberellinone is less than 150ppb, vomitoxin is less than 3000ppb, and aflatoxin is less than 2ppb.

Description

Technical Field

[0001] The invention belongs to the technical field of DDGS feed production methods, and in particular relates to a method for reducing toxins in DDGS feed produced as a byproduct of edible alcohol. Background Art

[0002] Animal husbandry accounts for a certain proportion of my country's economy. The development of animal husbandry is inseparable from feed, and the safety of feed directly affects the safety of livestock products. Corn DDGS is an important animal feed. Its full name is corn dried distiller's grains and solubles. It is a by-product obtained by heating, drying and mixing the waste residues and waste liquids left after fermentation in the process of producing corn ethanol by microbial fermentation.

[0003] The product quality of DDGS feed is crucial. Mold in DDGS feed will change the nutritional composition of feed and reduce the utilization of nutrients by animals. At the same time, mold will produce a large number of secondary metabolites in feed, which are called mycotoxins, such as vomitoxin, zearalenone and aflatoxin. Mycotoxins are one of the most important safety risk factors in the feed industry and feed supply chain. Cereals are the key substrate for mold growth, and cereals account for 50%-70% of feed. If animals consume too much grain feed contaminated by mold, it may cause mycotoxin residues in animal-derived foods (fish, meat and dairy products), further causing food safety problems.

[0004] Therefore, there is an urgent need in the prior art for a method of reducing toxins in DDGS feed, a byproduct of edible alcohol, so as to improve the product quality of DDGS feed. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for reducing toxins in DDGS feed, a byproduct of edible alcohol, so as to improve the product quality of DDGS feed.

[0006] The object of the present invention is achieved through the following technical scheme: a method for reducing toxins in DDGS feed produced as a byproduct of edible alcohol, comprising the following steps: 1) After the corn is dried and crushed, add 0.02% of the weight of corn amylase and 0.01-0.02% of the weight of amylase peroxide dehydrogenase to mix the material, and add 1.9 times the weight of corn water to preheat; 2) Preheating from 30°C to 45°C, with a residence time of 2 hours. Long preheating time facilitates the reaction of peroxidase and reduces the toxin content in the raw materials; 3) Continue to heat up to 105°C for liquefaction, cool down to 60°C through flash evaporation, and add 0.015% of the weight of corn saccharifying enzyme for saccharification; 4) Add yeast at a ratio of 0.002% by weight of the saccharified mash, the yeast contains 0.01% by weight of lactic acid bacteria, and ferment in a fermenter for 70 hours; 5) After the fermented mash is distilled in the tower, the temperature of the lees in the tower is lowered to below 40°C, and then 0.01-0.02% of the weight of the lees is added with lactic acid bacteria, and fermented at 35°C for 2 hours; 6) After fermentation, DDGS feed with low toxin content is obtained by centrifugal drying.

[0007] In the present invention, the preheating residence time in step 2) is 2 hours. The residence time is relatively long, so a portion of the toxins can be treated by peroxidase; in steps 4) and 5), two short-term fermentation steps are performed, and lactic acid bacteria are used to remove most of the remaining toxins.

[0008] The beneficial effects of the present invention are as follows: the method of the present invention can reduce the toxin content in DDGS and improve the product quality of DDGS feed. DETAILED DESCRIPTION

[0009] The present invention is described in detail below. Example 1

[0010] A method for reducing toxins in DDGS feed produced as a byproduct of edible alcohol comprises the following steps: 1) After the corn is dried and crushed, add 0.02% of the weight of corn amylase and 0.01% of the weight of amylase peroxide dehydrogenase to mix the material, and add 1.9 times the weight of corn water to preheat; 2) Preheating from 30°C to 45°C, with a residence time of 2 hours. Long preheating time facilitates the reaction of peroxidase and reduces the toxin content in the raw materials; 3) Continue to heat up to 105°C for liquefaction, cool down to 60°C through flash evaporation, and add 0.015% of the weight of corn saccharifying enzyme for saccharification; 4) Add yeast at a ratio of 0.002% by weight of the saccharified mash, the yeast contains 0.01% by weight of lactic acid bacteria, and ferment in a fermenter for 70 hours; 5) After the fermented mash is distilled in the tower, the temperature of the lees in the tower is reduced to below 40°C, and then 0.01% of the weight of the lees is added with lactic acid bacteria, and fermented at 35°C for 2 hours; 6) After fermentation, DDGS feed with low toxin content is obtained by centrifugal drying.

[0011] After being processed by the above steps of the present invention, the toxin content in the DDGS feed is: zearalenone <150 ppb, vomitoxin <3000 ppb, and aflatoxin <2 ppb. Example 2

[0012] A method for reducing toxins in DDGS feed produced as a byproduct of edible alcohol comprises the following steps: 1) After the corn is dried and crushed, add 0.02% of the weight of corn amylase and 0.02% of the weight of amylase peroxide dehydrogenase to mix the material, and add 1.9 times the weight of corn water to preheat; 2) Preheating from 30°C to 45°C, with a residence time of 2 hours. Long preheating time facilitates the reaction of peroxidase and reduces the toxin content in the raw materials; 3) Continue to heat up to 105°C for liquefaction, cool down to 60°C through flash evaporation, and add 0.015% of the weight of corn saccharifying enzyme for saccharification; 4) Add yeast at a ratio of 0.002% by weight of the saccharified mash, the yeast contains 0.01% by weight of lactic acid bacteria, and ferment in a fermenter for 70 hours; 5) After the fermented mash is distilled in the tower, the temperature of the lees in the tower is reduced to below 40°C, and then 0.02% of the weight of the lees is added with lactic acid bacteria, and fermented at 35°C for 2 hours; 6) After fermentation, DDGS feed with low toxin content is obtained by centrifugal drying.

[0013] After being processed by the above steps of the present invention, the toxin content in the DDGS feed is: zearalenone <150 ppb, vomitoxin <3000 ppb, and aflatoxin <2 ppb.

[0014] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A method for reducing toxins in DDGS feed produced as a byproduct of edible alcohol, characterized in that The steps include: 1) After the corn is dried and crushed, add 0.02% of the weight of corn amylase and 0.01-0.02% of the weight of amylase peroxide dehydrogenase to mix the material, and add 1.9 times the weight of corn water to preheat; 2) Preheat from 30°C to 45°C, with a residence time of 2 hours; 3) Continue to heat up to 105°C for liquefaction, cool down to 60°C through flash evaporation, add saccharifying enzyme at 0.015% of the weight of corn for saccharification, and obtain saccharified mash; 4) Add yeast at a ratio of 0.002% by weight of the saccharified mash, the yeast contains 0.01% by weight of lactic acid bacteria, and ferment in a fermenter for 70 hours; 5) After the fermented mash is distilled in the tower, the temperature of the lees in the tower is lowered to below 40°C, and then 0.01-0.02% of the weight of the lees is added with lactic acid bacteria, and fermented at 35°C for 2 hours; 6) After fermentation, DDGS feed with low toxin content is obtained by centrifugal drying.