Sodium diacetate
Sodium diacetate (SDA), also known as sodium diacetate, or monosodium diacetate, has the molecular formula ch3coona.ch3cooh.xh2o or NAH (CH3COO) 2, and the molecular weight of anhydrous matter is 142.09. It is a molecular compound of acetic acid and sodium acetate. 1g sodium diacetate can be dissolved in about 1ml water, and the pH of 10% solution is 4.5-5.0.
picture
Introduction to food additive sodium diacetate
1. Sodium diacetate is a new type of food and feed fungicide, sour agent and modifier with stable properties and low price. It is designated as a safe substance by the U.S. Food and drug administration. It has the functions of high-efficiency mildew prevention, corrosion prevention, fresh preservation, improving palatability, increasing nutritional value and helping growth. It is now widely used in livestock and poultry feed.
The safety of sodium diacetate is reflected in that sodium diacetate does not change the characteristics of food itself and is not affected by the pH value of food itself. It participates in the metabolism of the body and produces carbon dioxide and water. It can be regarded as a part of food and can maintain the original color, flavor and nutrients of food. Because it is safe, non-toxic, no residue, no carcinogen and no distortion, it is listed as an anti mildew and preservative for food developed by international organizations.
2. Gb2760-2014 standard for the use of food additives specifies the maximum amount of sodium diacetate used as a food additive in different foods.
picture
Action mechanism of sodium diacetate in anti-corrosion and anti mildew
The antiseptic and antifungal effect of sodium diacetate comes from acetic acid. The acetic acid molecule has good compatibility with lipid compounds. Acetic acid can penetrate the cell wall (the non dissociated acetic acid can penetrate the cell wall of mold tissue more effectively than the ionized acetic acid), denature the protein in the cell, and thus have the effect of sterilization.
Sodium diacetate interferes with the interaction of enzymes by effectively penetrating the cell wall of mold and inhibits the production of mold, so as to achieve the function of high-efficiency mildew prevention and corrosion prevention. In terms of chemical molecular structure, sodium diacetate is a bimolecular salt with short hydrogen bond and contains 40% of free acetic acid molecules that can be released. It is acidic in aqueous solution. The released acetic acid can penetrate into the cell wall of mold tissue and interfere with various enzyme systems in the cell, so as to denature the protein in the cell and inhibit the growth and reproduction of microorganisms, So as to play an antibacterial role. However, it has little effect on lactic acid bacteria and baker's yeast needed in food, and can protect the nutritional components of food. This characteristic makes sodium diacetate listed as a very unusual food additive.
Sodium diacetate has a strong inhibitory effect on fungi (including fungi, molds and bacteria). The single molecule acetic acid in its molecule can reduce the pH value of the substance and has good compatibility with ester compounds. Therefore, it can penetrate through the cell wall and effectively penetrate into the cells of bacterial tissues, interfere with the interaction of enzymes between cells, promote the denaturation of bacterial proteins, change the cell morphology and structure, achieve the purpose of bacterial dehydration and death, and play the role of antibacterial and anti-corrosion. As SDA is a highly effective inhibitor of mold and bacteria, especially aflatoxin, it can effectively inhibit the occurrence, growth and spread of more than 10 kinds of mycotoxins (spores) and 4 kinds of bacterial nuclides common in meat, vegetables, fruits, corn, wheat, peanuts, grains, beans, bread and other agricultural products.
Application of sodium diacetate
1. As anti mildew preservative
Adding 0.1-0.2% 1-2kg / T sodium diacetate to the feed can effectively prevent the feed from mildew and prolong the storage period of the feed by 1-2 months; Adding 0.1-0.3% sodium diacetate to the compound feed can preserve the feed for 3-5 months.
2. As a nutritional flavoring agent
Adding 0.05-0.2% sodium diacetate in pellet formula feed can increase the utilization rate of protein in feed by 11%, increase the weight of fish by more than 10%, and increase the weight of piglets by 6-8%. Adding an appropriate amount of sodium diacetate in milk formula feed can effectively improve the milk protein content of dairy cows.
3. As disinfectant
Adding 0.1-0.2% sodium diacetate to aquatic feed can effectively prevent fish diseases caused by homologous microorganisms and can be used as clarifying disinfectant for fish ponds; Adding 0.05-0.3% sodium diacetate to poultry feed can prevent chicken diarrhea and improve the survival rate of brood by more than 10%.
4. Improve the utilization rate of feed nitrogen and energy
The addition of 0.3% sodium diacetate in the feed increased the daily gain of weaned piglets by 10.8% compared with no addition; It had a significant effect on the daily feed intake of weaned piglets. The addition of sodium diacetate can significantly improve the feed conversion rate of weaned piglets (by 10.5%), which may be mainly because sodium diacetate improves the utilization rate of feed nitrogen and energy.
5. Improve the milk yield and milk fat rate of dairy cows
Feeding cows with 0.1% - 0.5% sodium diacetate in feed can increase feed intake by 10% - 20%, milk yield by 13% - 20% and milk fat rate by 0.2%.