Versatile Uses of Glycerin in the Food Industry

Glycerin, also known as glycerol, is a versatile food additive with a wide range of applications in the food and beverage industry. Chemically, it is a simple polyol compound, typically derived from plant oils like coconut or palm oil or produced through the fermentation of sugars. This naturally occurring substance is known for its sweet taste, although it is only about 60-75% as sweet as sucrose, which makes it a suitable low-calorie alternative for specific applications.

One of the primary functions of glycerin in food products is as a humectant. A humectant is a substance that helps retain moisture, preventing products from drying out. This property is particularly beneficial in food items such as baked goods, candies, and dried fruits. In baked goods, for example, glycerin helps maintain the softness of cakes, muffins, and cookies, extending their freshness and shelf life. Similarly, in candies like marshmallows and chewing gum, glycerin helps preserve a chewy texture, preventing the products from becoming hard or stale.

In addition to its moisture-retaining abilities, glycerin acts as a solvent, which means it helps dissolve other food ingredients, enhancing the consistency and texture of products. This is crucial in processed foods, where uniformity in texture is essential for consumer satisfaction. Glycerin is particularly effective in dissolving flavors and colors, ensuring even distribution throughout the product.

Glycerin also functions as a sweetener and preservative. Its ability to prevent sugar crystallization is especially valuable in confections like soft candies and icings, where a smooth, creamy texture is preferred. Furthermore, glycerin’s preservative properties stem from its ability to lower water activity in food products, reducing the likelihood of spoilage by inhibiting microbial growth.

Despite its wide usage, glycerin is generally recognized as safe (GRAS) by health authorities such as the U.S. FDA and the WHO. Its multifunctional properties and safety profile make it an indispensable ingredient in the modern food industry.
Versatile Uses of Glycerin in the Food Industry

Candelilla wax

Candelilla wax is very similar to beeswax in texture and scent, and it poses many of the same benefits. It is an excellent humectant, works wonders for moisturizing dry skin, and is incredibly soothing.

Candelilla wax is a natural plant wax derived from Euphorbia antisyphilitica Zucc., which is grown in the semi-desert regions. It is a complex mixture composed of wax hydrocarbons, wax, resin esters, lactones, free wax resin alcohols, and free wax resin acids.

This wax is a globally recognized food additive approved by the FDA, used mainly as a glazing agent and binder for chewing gums. As a food additive, candelilla wax has the E number E 902.

Candelilla wax is obtained through extraction from the plants by immersion in a tank containing boiling water acidified with sulfuric acid. Candelilla wax is a hard and brittle wax. It is composed of about 20-29% wax esters, 12-14% alcohols and sterols, 49-50% hydrocarbons, 7-9% free acids, 2-3% moisture and 1% mineral matter.
Candelilla wax

Humectants

Humectants are hygroscopic (attracting moisture from the air) excipients such as propylene glycol or glycerine. The substances are incorporated in food to promote retention of moisture. It prevents food from drying out by counteracting the effect of a wetting agent atmosphere having low degree of humidity.

Humectants are additives that bind water and control water activity (aw). They are believed to reduce water activity of a product due to the presence of hydrophilic group such as hydroxyl groups, which have affinity to form hydrogen bonds with molecules of water, thus decreasing the availability of free water.

Water activity reduction achieved by adding humectants to food enhances stability, maintains texture, and reduces microbial activity.

Salt and sugar are the oldest, most widely used humectants. Other commonly used humectants include sorbitol, glycerol and propylene glycol.

They can be added to the food system to develop more favorable conditions, without adversely affecting flavor and texture.

Propylene glycol is used to maintain moisture within a narrow range in certain food products, such as coconut and marshmallows, in certain medicines and cosmetics as well as in tobacco, and is a solvent for food colors and flavors.

Glycerol is used as a solvent for flavors and food colors. It is also used as a humectant, plasticizer, emollient, sweetener, and filler in low-fat food products such as cookies. Glycerol is a common energy yielding food and is widely distributed in food, both as a natural constituent and as a GRAS (generally recognized as safe) additive.

Sorbitol is widely present in nature, particularly as a constituent of many fruits and berries. Sorbitol syrup is used as an efficient humectant, and as a sequestering and emulsifying agent in confectionery and bakery products, as well as in mayonnaise, creams and sauces.
Humectants