Correct selection of mycotoxin adsorbent

At present, there are many mycotoxin adsorbents or binders on the market, which can be divided into two categories: one is inorganic binders, such as zeolites, bentonite and various clays. Second, organic adsorbents, such as yeast cell wall extract, cellulose and hemicellulose, should conform to the following principles no matter which kind of product is selected: 1 it must have high adsorption capacity and high adsorption capacity comes from the huge adsorption schedule area, the average specific surface area of zeolite powder is 18 square meters / g, and the average specific surface area of kaolin is 23 square meters / g. The specific surface area of Dumycin (previous generation) is 848 square meters / g. If a product lacks this data, it may be that the product lacks basic research. In principle, the first step in choosing a product is to look at the specific surface area. The specific surface area is less than 600 and there are usually larger interlayer channels, which provide a greater opportunity for the adsorption of nutrients. There is an essential difference between adsorption and adhesion. Adsorption is generally interpreted as "high-strength binding", while adhesion depends on the huge surface area to adhere to some toxins, rather than binding, these toxins will be freed out in the process of intestinal peristalsis and absorbed into the bloodstream to produce toxic effects. Although activated carbon has a large surface area, it can not be used to prevent aflatoxin poisoning in animals because it cannot really combine aflatoxin. (2) the ideal toxin adsorbent for selective adsorption should have the characteristics of adsorbing only toxins but not nutrients. So far, the literature on selective adsorption published in international authoritative academic journals is very limited. The author refers to "Poultry Science" and "Natural toxins" and proves that only NOVASIL has the characteristics of selective adsorption, but many bentonite products also claim to have selective characteristics. In order to help you understand and judge, the American Committee on mycotoxins specially stressed that only through experiments that only absorb toxins, not nutrients, can it be called selective adsorption. Otherwise, it can not claim to have selective adsorption characteristics, demycin is the authoritative academic literature proved to have selective adsorption characteristics. (3) broad-spectrum adsorption requires that a variety of toxins can be well adsorbed under the premise of high toxin concentration. The study of demycin shows that this product can specifically absorb aflatoxin, zearalenone and ochratoxin at the same time. The research of Dr. Donald, president of American United Feed Company, shows that Demycin can overcome the toxic effects of vomiting toxin and zearalenone on piglets, while laboratory studies have shown that general vomiting toxins are difficult to be absorbed by adsorbents. (4) No side effects means that such products can not have obvious adverse effects or pollution on the animal or human food chain, first of all, they can not absorb a large amount of nutrients, and animals have a higher demand for micronutrients than usual when there is a high concentration of toxics. this determines that zeolite powder and bentonite can not be used as toxin adsorbents. Adsorbents can not contain substances such as dioxins that pollute the human food chain, and the carcinogenic incubation period of dioxins in the human body can reach more than 20 years. In western countries, dioxins are listed as the first pollutant. China's feed industry has not systematically tested the dioxin pollution in feed so far. Bentonite in the United States has been reported for many times to contain excessive dioxins. Therefore, each company should provide proof that dioxins meet the standard at the time of import. (5) it must be proved to be effective only with double data of laboratory and animal experiments to prove its effectiveness. many companies only provide data that laboratories have adsorption capacity, and activated carbon is proved to be able to absorb a certain amount of aflatoxin in the laboratory. however, animal poisoning can not be prevented in animal experiments, indicating that the efficacy of the product can not be proved by laboratory results alone. In order to ensure that the product meets all the above five conditions and the reliability of the information provided, all the above materials should be published in authoritative academic journals. If any company can provide products that meet the above conditions, the products should be classified as advanced special adsorbents for the adsorption of toxins, otherwise the products may have mild or serious shortcomings or even not worth using. Although unipolarity and bipolarity are used to describe the characteristics of different soils in many fields of soil chemistry in the United States, the characteristics related to adsorption properties are no longer expressed by polarity after physical modification of clay. Abroad, domestic zeolite powder and bentonite products should be clearly classified and can not be used as toxin adsorbents. This can be done with reference to the FDA classification of the United States. Responsible editor: Dr. Kang-the effect is not easy to judge, used, when the raw material is good, no problem, when there is something wrong with the raw material, can not afford to use it. Early vomiting toxins can cause skin irritation, loss of appetite and vomiting In the later stage, it will cause bleeding, gangrene of digestive tract, problems of central nervous system, destruction of immune system, decrease of hematopoiesis in bone marrow and decrease of spleen and reproductive function. The limit standard of DON in grains in China is 1.0 mg/kg. At present, there is no perfect product, and the products on the market can only partially solve the problem. -- after adsorption, I think we have to protect the intestines and remove toxins-- the good moderator of that manufacturer said.