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Lactic acid is an important organic acid, and its yield and consumption are second only to the second organic acid of citric acid. It is reported that the consumption of lactic acid accounts for about 15% of the total consumption of organic acids. In recent years, due to the expansion of L-lactic acid in biodegradable plastics, the demand will increase at a relatively large rate. It is predicted that it may catch up or exceed citric acid after several years. Lactic acid is widely found in nature, and lactic acid is found in living organisms. Lactic acid, also known as 2-hydroxypropionic acid, α-hydroxypropionic acid, has an asymmetric carbon atom in its molecular structure, forming two optical isomers, d-body, l-body and racemic dl-body, totaling 3 An optical isomer. In 1780 Scheele got this product in sour milk, hence the name lactic acid. There are right-handed and racemic forms in human and animal meat tissues, while left-handed bodies are normal metabolites of mammals. It is also naturally found in fruits such as poppies, apples, and tomato juice. Commercially available products, whether produced by fermentation or synthetic methods, are racemic forms.
Due to the presence of hydroxyl groups and carboxyl groups in the molecule, the product has the functions of these two functional groups, forming a carboxylic acid ester with an acid anhydride, forming a lactate with an alcohol, and forming a salt with sodium, calcium, ferrous iron or the like; Hydroxyl groups and carboxyl groups, therefore, self-esterification can occur to form linear polyesters, and even cyclic compounds can be formed, ie, cyclic dimer lactide . When oxidized under slow conditions, this product can produce pyruvic acid. When heated to above 250 °C, it will be broken down to form acetaldehyde, which will release carbon dioxide and water. Reaction with ammonia or an amine produces lactic acid amide. In addition to the self-esterification of the hydroxyl and carboxyl groups of the product, the hydroxyl group and the carboxyl group may also participate in the reaction, for example, by reacting with an aldehyde or a ketone to form a cyclic acetal. In the pharmaceutical use of sodium lactate to prevent acidosis, lactate, calcium lactate, etc. are raw materials for the pharmaceutical industry, ethyl lactate is a fragrance, butyl lactate is a good auxiliaries for lacquers, and an important raw material for plasticizers and improvers in the plastics industry; Used as a rust remover in the electroplating industry.
1) Lactic acid has strong antiseptic and fresh-keeping effect. It can be used in fruit wine, beverage, meat, food, pastry making, vegetable (olive, cucumber, pearl onion) pickling and canning, grain processing, fruit storage, with adjustment pH, bacteriostatic, prolonged shelf life, seasoning, color preservation, and product quality;
2) In terms of seasoning, the unique sour taste of lactic acid can increase the taste of food. Adding a certain amount of lactic acid to salads such as salad, soy sauce and vinegar can maintain the stability and safety of microorganisms in the product, and at the same time make the taste more mild. ;
3) Because of the mild acidity of lactic acid, it can also be used as the preferred sour agent for delicate soft drinks and juices;
4) When brewing beer, adding proper amount of lactic acid can adjust the pH value to promote saccharification, facilitate yeast fermentation, improve beer quality, increase beer flavor and extend shelf life. Used in white wine, sake and fruit wine to adjust pH, prevent the growth of bacteria, enhance the acidity and refreshing taste; 5. Buffered lactic acid can be used in hard candy, fruit candy and other confectionery products, with moderate acidity and low sugar conversion rate. Lactic acid powder can be used for powdering various types of candy as a powdery sour agent;
5) Natural lactic acid is a natural intrinsic component in dairy products. It has the taste of dairy products and good anti-microbial effect. It has been widely used in blending yoghurt cheese, ice cream and other foods, and has become a popular dairy acid sour agent;
6) Lactic acid powder is a direct sour conditioner for the production of steamed bread. Lactic acid is a natural fermented acid, so it can make bread unique. Lactic acid is a natural sour taste regulator. It is used for baking and baking in bread, cakes, biscuits, etc., and can improve the quality of food and maintain color. , extend the shelf life.
1) Using lactic acid vapor disinfection in wards, operating rooms, laboratories, etc., can effectively kill bacteria in the air, reduce disease and improve health;
2) widely used as a preservative, carrier, cosolvent, pharmaceutical preparation, pH adjuster, etc. in medicine;
3) Lactic acid polymerizes to obtain polylactic acid. Polylactic acid can be drawn into a silk-spun yarn. This thread is a good surgical suture. After the suture is healed, it can be automatically degraded into lactic acid and absorbed by the human body without adverse consequences. In particular, the surgical suture in the body eliminates the trouble of suturing the second operation. The polymer compound can be used as a binder for organ transplantation and bone grafting;
4) Lactic acid can be directly formulated into medicines or daily health care products; such as Jiaolu private parts shower gel is a formula developed by European experts. It is slow to produce mature vaginal lactobacilli, and has added lactic acid to maintain the self-cleaning effect of the vagina.
5) The restriction of muscle vitality and anti-fatigue.
1) Lactic acid is used in the fermentation industry to control pH and increase the purity of the ferment;
2) In the cigarette industry, tobacco moisture can be maintained, impurities in tobacco can be removed, taste can be changed, tobacco grade can be improved, lactic acid can neutralize nicotine nicotine, and harmful substances can be reduced to improve tobacco quality;
3) Used in the textile industry to treat fibers, which can make the fibers easy to color, increase the luster, and make the touch soft;
4) Used as a pH regulator and synthetic agent in the paint ink industry; in the plastic fiber industry, it is the preferred raw material for the degradable new material polylactic acid PLA;
5) Lactic acid can also be used as a starting material for polylactic acid to produce a new generation of fully biodegradable plastics;
6) In the tanning industry, lactic acid can remove the lime and calcium from the leather, making the leather soft and fine, thus making high-grade leather;
7) Lactic acid is often used in nickel plating because it has a unique complexing constant for nickel. It can also be used as an acid-base buffer and stabilizer in the plating bath. In the microelectronics industry, its unique high purity and low metal content meets the high quality requirements of the semiconductor industry. It is used as a safe organic solvent for the cleaning of photosensitive materials.
8) Lactic acid is used as a pH regulator and a synthetic agent in a variety of water-based coating systems. Such as: coating of electrodeposited materials. Lactic acid products have a low boiling point and are ideally suited for safe dissolution systems for high solids coatings. The lactic acid product line offers opportunities to produce high solids coatings with good fluid properties;
9) Lactic acid has the functions of cleaning and descaling. It is better for washing and cleaning products than traditional organic detergents, so it can be applied to many descaling products. Such as: toilet, bathroom, coffee machine cleaner. Lactic acid is antimicrobial and can be synergistic when used in combination with other antimicrobial agents such as ethanol.
1) Since L-lactic acid is part of the skin's inherent natural moisturizing factor, it is widely used as a moisturizer for many skin care products. L-lactic acid is the most effective type of AHA and has little irritation;
2) Since L-lactic acid is naturally present in the hair, the effect is to make the surface of the hair shiny and bright, so lactic acid is often used as a pH regulator for various hair care products;
3) Lactic acid can be used as a moisturizer in various toiletries, such as private bath, strip soap and moisturizer. It can be used as a pH regulator in liquid soaps, soaps and shampoos. In addition, the addition of lactic acid in the bar soap reduces the loss of moisture during storage and thus prevents the soap from cracking.
Agricultural livestock industry
1) Lactic acid with an optical purity of more than 99% can be used in the production of slow-release pesticides such as herbicides, which are non-toxic and efficient for crops and soils;
2) Lactic acid polymer is used to produce agricultural film, which can be used to replace plastic film, which can be decomposed by bacteria and then absorbed by the soil, which is good for environmental protection;
3) Lactic acid is also used in green feed storage agents and forage ripening agents;
4) As a growth promoter in pig and poultry feed. Lactic acid can lower the pH in the stomach, activate digestive enzymes, improve the ability of amino acids to digest, and benefit the growth of the intestinal epithelium. Piglets are fed a diet containing acidifiers for several weeks after weaning, which can increase body weight by 15% during weaning;
5) Lactic acid inhibits the growth of microorganisms. Lactating piglets are infected with diseases caused by Escherichia coli and Salmonella, and the addition of lactic acid to the feed prevents the growth of pathogenic bacteria in the lower gastrointestinal tract of piglets;
6) Lactic acid can act as a preservative for feed and enhance microbial stabilizers for by-products of feed, grain and meat processing products;
7) Adding lactic acid to the drinking water of poultry and piglets can effectively inhibit the growth of pathogenic bacteria and increase the weight of animals.
Toxicity protection Pure product is non-toxic. The salts are not toxic as long as they are not heavy metal salts. The oral LD50 of the rats was 3730 mg/kg.
Features: The pure product is a colorless liquid, and the industrial product is a colorless to pale yellow liquid. Odorless and hygroscopic. It is miscible with water, ethanol and glycerin, and insoluble in chloroform, carbon disulfide and petroleum ether.
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