1. The use of lactic acid in the food industry
1) Lactic acid has a strong antiseptic and fresh-keeping effect. It can be used in fruit wine, beverages, meat, food, pastry production, vegetable (olive, cucumber, pearl onion) pickling and canning processing, grain processing, and fruit storage, with adjustments The functions of pH value, antibacterial, extending shelf life, seasoning, maintaining food color and improving product quality;
2) In terms of seasonings, the unique sour taste of lactic acid can increase the deliciousness of food. Adding a certain amount of lactic acid to salads, soy sauce, vinegar and other seasonings can maintain the stability and safety of microorganisms in the product, and at the same time make the taste more mild ；
3) As the acidity of lactic acid is mild and moderate, it can also be used as the first choice for carefully prepared soft drinks and fruit juices;
4) When brewing beer, adding an appropriate amount of lactic acid can not only adjust the pH value to promote saccharification, be beneficial to yeast fermentation, improve beer quality, but also increase beer flavor and extend shelf life. Used in white wine, sake and fruit wine to adjust pH, prevent the growth of bacteria, enhance sourness and refreshing taste; 5. Buffered lactic acid can be used in hard candies, fruit candies and other candy products, with moderate acidity and low sugar conversion rate. Lactic acid powder can be used for powdering all kinds of candies, as a powdered sour agent;
5) Natural lactic acid is a natural and inherent ingredient in dairy products. It has the taste of dairy products and good antimicrobial effect. It has been widely used in foods such as blended yogurt, cheese, ice cream, etc., and has become a popular sour agent for dairy products;
6) Lactic acid powder is a direct acidity regulator used in the production of buckwheat. Lactic acid is a kind of natural fermented acid, so it can make bread have a unique taste; as a natural sourness regulator, lactic acid is used for flavoring and antibacterial effects in baked foods such as bread, cakes, biscuits, and can improve the quality of food and maintain the color , Extend the shelf life.
2. The use of lactic acid in medicine
1) The use of lactic acid vapor for disinfection in wards, operating rooms, laboratories and other places can effectively kill bacteria in the air, reduce diseases, and achieve the purpose of improving health;
2) Widely used as preservatives, carriers, cosolvents, pharmaceutical preparations, pH regulators, etc. in medicine;
3) Polylactic acid is obtained by polymerization of lactic acid. Polylactic acid can be drawn into silk and spun into thread. This thread is a good surgical suture. After the seam is healed, there is no need to remove the suture. It can automatically degrade into lactic acid and be absorbed by the body without adverse consequences. Especially the surgical sutures in the body can avoid the trouble of second operation suture removal. This polymer compound can be used as an adhesive in organ transplantation and bone fixation;
4) Lactic acid can be directly formulated into medicine or made into lactate for use;
5) Restrictive effect on muscle vitality and anti-fatigue.
3. The use of lactic acid in industry
1) Lactic acid is used in the fermentation industry to control pH and improve the purity of fermentation products;
2) In the cigarette industry, it can maintain the humidity of tobacco, remove impurities in tobacco, change the taste, and improve the quality of tobacco. Lactic acid can also neutralize nicotine and nicotine, reduce harmful components to the human body and improve tobacco quality;
3) Used to process fibers in the textile industry, which can make the fibers easy to color, increase luster, and make the touch soft;
4) Used as a pH regulator and synthetic agent in the coating and ink industry; in the plastic fiber industry, it is the first choice for the new degradable material PLA;
5) Lactic acid can also be used as the starting material of polylactic acid to produce a new generation of fully biodegradable plastics;
6) In the tanning industry, lactic acid can remove lime and calcium from the leather, making the leather soft and dense, thereby making high-quality leather;
7) Lactic acid is often used in nickel plating process due to its unique complex constant for nickel. It can also be used as an acid-base buffer and stabilizer in the electroplating bath. In the microelectronics industry, its unique high purity and low metal content meet the semiconductor industry's high quality requirements, and it can be used as a safe organic solvent to clean photosensitive materials;
8) Lactic acid can be used in various water-based coating bonding systems as a pH adjuster and synthetic agent. Such as: the coating of electrowinning. Lactic acid products have a low boiling point and are very suitable for safe dissolution systems for high-solid coatings. The lactic acid product series provide an opportunity to produce high solids-containing coatings with good fluid properties;
9) Lactic acid has the functions of cleaning and descaling. It is better for washing cleaning products than traditional organic descaling agents, so it can be used in many descaling products. Such as: cleaners for toilets, bathrooms, coffee machines. Lactic acid has antimicrobial properties, and when it is used in conjunction with other antimicrobial agents such as ethanol, it can produce a synergistic effect.
4. The use of lactic acid in the cosmetics industry
1) Since L-lactic acid is a part of the skin's natural moisturizing factor , it is widely used as a moisturizer in 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, its function is to make the hair surface shiny and bright, so lactic acid is often used as a pH regulator in various hair care products;
3) Lactic acid can be used as a humectant in various bath products, such as body wash, bar soap and emollient honey. It can be used as a pH regulator in liquid soaps, soaps and shampoos. In addition, the addition of lactic acid to the bar soap can reduce the loss of water during storage, thus preventing the soap from drying out.
5. The use of lactic acid in agricultural products and agriculture
1) Lactic acid with an optical purity of more than 99% can be used to produce slow-release pesticides in pesticides, such as herbicides, which are non-toxic, harmless and highly efficient to crops and soil;
2) Lactic acid polymer is used in the production of agricultural film, which can be used to replace plastic film, which can be decomposed by bacteria and absorbed by the soil, which is beneficial to environmental protection;
3) Lactic acid is also used as green fodder storage agent and forage maturation agent;
4) As a growth promoter in pig and poultry feed. Lactic acid can lower the PH value in the stomach, activate digestive enzymes, improve amino acid digestibility, and is beneficial to the growth of intestinal epithelium. Piglets fed with feed containing acidulants for several weeks after weaning can increase their body weight by 15% during weaning;
5) Lactic acid inhibits the growth of microorganisms. Lactating piglets can be infected with diseases caused by E. coli and Salmonella. Adding lactic acid to the feed can prevent the growth of pathogenic bacteria in the lower gastrointestinal tract of the piglets;
6) Lactic acid can be used as a feed preservative and enhance the microbial stabilizer of 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 speed of animal weight gain.