What is Sodium Lactate & What are Its Uses?

What is sodium lactate? To define this chemical substance, we should first understand what lactate is.

Lactate is a carboxylic acid with the molecular formula C3H6O3. It contains a hydroxyl group and belongs to the category of alpha-hydroxy acids (AHAs). In an aqueous solution, the carboxyl group releases a proton, resulting in lactate anions (CH3CH(OH)COO-). Lactate is widely present in the human body, animals, plants, and microorganisms.

So, what is sodium lactate? Sodium lactate is a chemical compound produced by neutralizing the lactate generated through the fermentation of sugar-containing plants like corn and beets. Its molecular formula is C3H5O3Na, with a molecular weight of 112.06. Sodium lactate is a colorless or slightly yellowish transparent syrup-like liquid with strong hygroscopic properties. It is odorless or may have a slightly distinctive odor and a slightly salty-bitter taste. It can dissolve in water, ethanol, and glycerol. The typical concentration ranges from 60% to 80% (by weight).

What are the uses of sodium lactate?

• Food Industry: Sodium lactate is utilized as a food preservative, flavor enhancer, antifreeze agent, and humectant in the food industry. It has been applied as a substitute for sodium benzoate as a preservative in some countries. Sodium lactate offers incomparable advantages over sodium benzoate, sodium citrate, and sodium erythorbate.

Specifically, it has the following significant effects on meat products:

1. Extended shelf life: It can prolong the shelf life by 30% to 100% or even longer.
2. Inhibiting the growth of pathogenic bacteria in food, such as E. coli, Listeria monocytogenes, and Clostridium botulinum, thereby increasing food safety.
3. Enhancing and preserving the flavor of meat.
4. As a salt, sodium lactate can reduce the amount of sodium chloride (table salt) used in meat products. It is also safer for individuals with low-salt diets, hypertension, or kidney diseases.

• Medical Field:

(1) In liquid form, sodium lactate can alleviate dehydration caused by diarrhea, poisoning caused by diabetes, and gastritis. It is used to replenish body fluids or electrolytes in intravenous solutions and is extensively applied in continuous ambulatory peritoneal dialysis (CAPD) for patients with kidney diseases. It is also used as an electrolyte and dialysate in intravenous injections, disinfectants for oral rinses, and bladder irrigation solutions.

(2) Sodium lactate is widely used in the preparation of Ringer's solution as an injectable solution for the treatment of metabolic acidosis.

(3) Sodium lactate is highly effective in treating skin disorders such as extreme dryness caused by conditions like xerosis. Lactate and lactate salts have antimicrobial properties and are used in anti-acne products. They are often combined with other active ingredients to produce a synergistic effect.

• Personal Care Industry:

Lactate and lactate salts are natural components of human skin and hair. They possess unique pH-regulating and moisturizing functions and find wide application in various personal care products such as bath products, skincare products, hair care products, and oral care products.

(1) Skincare products: Sodium lactate, being a natural moisturizing factor, constitutes one-fourth of the components in the stratum corneum of the skin. When used in cosmetics, sodium lactate can form a hydrating film with other chemicals, preventing the evaporation of skin moisture and keeping the skin hydrated, thereby preventing the formation of wrinkles. Sodium lactate is widely used as a moisturizing agent in skincare products. L-lactate salts can be used as a new generation of skin whitening agents, and when combined with other skin whitening agents, they exhibit a synergistic effect.

(2) Soaps and body wash: Sodium lactate is used as a moisturizer in various bathing products such as body washes, bar soaps, and body lotions. It serves as a pH regulator in liquid soaps, solid soaps, and shampoos. Additionally, adding sodium lactate to bar soap reduces water loss during storage, preventing the soap from drying out and cracking.

(3) Oral care products: Sodium lactate, with its high solubility and moderate taste, is an ideal source of calcium for oral care products. It promotes healthy teeth and has anti-plaque effects, making it widely used as an anti-plaque agent in toothpaste and mouthwash. The hemostatic properties of sodium aluminum lactate have a positive effect on gums and oral mucosa. Sodium lactate is stable, highly soluble in water, tasteless, and compatible with fluoride ions. It effectively inhibits tooth decay, removes dental plaque, and is extensively used in toothpaste and mouthwash as an anti-plaque agent.

(4) Hair care products: Lactate is a natural component of hair, and in hair care products, it functions as a pH regulator. Its mild nature allows for adjusting the pH to a slightly acidic level, improving hair quality and making it easier to comb.

Wrapping Up:

What is sodium lactate? Sodium lactate, derived from the fermentation of sugar-containing plants, is a versatile chemical compound. It finds applications in various industries, including food, medical, and personal care. And its multifunctional benefits make it a valuable ingredient in numerous consumer products.