Theo Nash
Glycerol, also known as glycerin or glycerine, is a clear, colourless, sweet-tasting liquid. It is a trihydric alcohol, meaning that its molecules contain three hydroxyl groups. This gives glycerol unique properties, such as being miscible with water and having preserving qualities. With its various applications, glycerol is an important compound in multiple industries, including food, pharmaceuticals, and personal care products.
| Characteristics | Values |
|---|---|
| Number of Alcohol Groups | 3 |
| Molecular Formula | HOCH2CHOHCH2OH |
| Chemical Structure | HOCH2-CHOHCH2OH |
| Discovered By | German/Swedish chemist Carl Wilhelm Scheele |
| Discovered In | 1779 |
| Named By | French chemist Michel Eugène Chevreul |
| Named In | 1811 |
| Other Names | Glycerin, Glycerine, Glycerites |
| Appearance | Clear, colourless, viscous, sweet-tasting liquid |
| Odour | Odourless |
| Solubility | Miscible with water, 100% water-soluble |
| Hygroscopic Nature | Yes |
| Toxicity | Non-poisonous to humans |
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What You'll Learn
Glycerol is a trihydric alcohol with three hydroxyl groups
Glycerol, also known as glycerin or glycerine, is a trihydric alcohol. This means that its molecules contain three hydroxyl (–OH) groups. The chemical structure of glycerol is HOCH2-CHOHCH2OH, with each of the end carbon atoms bonded to two hydrogen atoms (C–H) and a hydroxyl group (–OH). The central carbon atom is bonded to a hydrogen atom (C–H) and a hydroxyl group (–OH).
Glycerol is a clear, colourless, viscous, and sweet-tasting liquid. It is a simple triol compound that is part of the alcohol family of organic compounds. Glycerol is not poisonous to humans and is commonly found in fats and oils, particularly as the primary triglyceride in coconut and olive oils. It is also naturally occurring in all animal and plant cells.
The name "glycerine" was first introduced in 1811 by Michel Eugène Chevreul to describe what German-Swedish chemist Carl Wilhelm Scheele had previously called the "sweet principle of fat" upon discovering it in 1779. The word "glycerine" refers to commercial preparations of less than 100% purity, typically 95% glycerol. The term "glycerol" was later adopted in 1872 to denote the compound's relation to the alcohols family with the -ol suffix.
Glycerol has a wide range of applications across various industries. In the food industry, it is used as a sweetener, while in pharmaceuticals, it is used as a humectant. Glycerol is also an ingredient in gums and resins for protective coatings like automotive enamels and exterior house paints. It is used in the cosmetic industry in products such as skin lotions, mouthwashes, and shaving creams. Additionally, glycerol serves as a protective medium for freezing red blood cells, sperm cells, eye corneas, and other living tissues.
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It is a clear, colourless, sweet-tasting liquid
Glycerol, also known as glycerin, glycerine, or propane-1,2,3-triol, is a clear, colourless, sweet-tasting liquid. It is a trihydric alcohol, meaning that its molecules contain three hydroxyl (–OH) groups. The name glycerine was introduced in 1811 by French chemist Michel Eugène Chevreul, derived from the Ancient Greek word 'glykys', meaning sweet. It was originally called the "sweet principle of fat" by its discoverer, German-Swedish chemist Carl Wilhelm Scheele, in 1779.
Glycerol is a simple triol compound. It is a combination of sugar and alcohol and is classified by the FDA as a caloric macronutrient. In its pure form, it is a sweet-tasting, odourless, and viscous liquid that is 100% soluble in water. It is a non-poisonous substance to humans.
Glycerol has a wide range of uses. In the food industry, it is used as a sweetener and a humectant. It is also used in gums and resins to create protective coatings such as automotive enamels and exterior house paints. In the pharmaceutical industry, it is used in drug solvents, skin lotions, mouthwashes, and cough medicines. Glycerol is also a component of emulsifiers, which are used as softening agents in baked goods, plasticizers in shortening, and stabilizers in ice cream.
Additionally, glycerol is used in the cosmetic industry in products such as shaving cream, hair care, skincare, and toothpaste. It is also used in blood banking to preserve red blood cells before freezing and has applications in bioprinting and e-cigarettes. Glycerol's ability to form strong hydrogen bonds with water molecules makes it a useful solvent in botanical extractions, where it acts as a preserving agent without causing denaturation or rendering botanical constituents inert, as alcohols like ethanol do.
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Glycerol is used as a solvent in herbal extractions
Glycerol, also known as glycerin, is a clear, colourless, viscous, sweet-tasting liquid that belongs to the alcohol family of organic compounds. It has a molecular formula of HOCH2CHOHCH2OH and three hydroxyl groups.
Glycerol is often used as a solvent in herbal extractions, particularly in the cosmetic and pharmaceutical industries. It is a stable preserving agent for botanical extracts and does not cause the inversion or reduction-oxidation of a finished extract's constituents, even over several years. This is because glycerol does not denature or render a botanical's constituents inert, as other alcohols like ethanol and methanol do. Glycerol is also bacteriostatic, while ethanol is bactericidal.
Glycerol is a common solvent used in the extraction of polyphenols, flavonoids, and chlorophyll from plants. For example, it can be used to extract polyphenols from Carménère grape pomace and peppermint and common nettle leaves. The extraction temperature and solvent mixture ratios play a significant role in the concentration of the determined components in the extracts.
Glycerol is also used as a solvent in tincture method extractions, specifically as a 10% solution, to prevent tannins from precipitating in ethanol extracts of plants. It can be used as an "alcohol-free" alternative to ethanol, although it is important to note that glycerol itself contains alcohol groups. Additionally, alcohol-based tinctures can have the alcohol removed and replaced with glycerol for its preserving properties.
The use of glycerol as a solvent in herbal extractions is advantageous due to its low price, ease of acquisition, and fitness for consumption. It is also in line with the concept of ""green chemistry," which aims to protect the environment by limiting the use and generation of hazardous substances.
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It is bacteriostatic, unlike ethanol, which is bactericidal
Glycerol is a simple triol compound with three hydroxyl groups. It is a colourless, odourless, sweet-tasting, and viscous liquid. Glycerol is bacteriostatic, which means it is a biological or chemical agent that stops bacteria from reproducing but does not necessarily kill them. Ethanol, on the other hand, is bactericidal, meaning it kills bacteria.
Bacteriostatic agents, such as glycerol, work by interfering with bacterial protein production, DNA replication, or other aspects of bacterial cellular metabolism. They do not cause bacteria to die but rather prevent them from multiplying and spreading. This makes them useful in various applications, such as plastics, to prevent the growth of bacteria on surfaces.
In contrast, bactericidal agents like ethanol are often sought after for their bacteria-killing properties. For example, benzoyl peroxide is a bactericidal agent used in acne medications to kill the bacteria that contribute to acne formation.
While bactericidal agents may seem preferable to bacteriostatic agents due to their bacteria-killing ability, clinical studies have shown that this is not always the case. In a review of 56 randomized controlled trials comparing the efficacy of bacteriostatic and bactericidal agents, 49 trials found no difference in efficacy, 6 trials found the bacteriostatic agent superior, and only 1 trial found the bactericidal agent superior.
Furthermore, bacteriostatic agents like glycerol can be advantageous in certain situations. For instance, glycerol is used as a preserving agent in botanical extracts, preventing the constituents from denaturing or becoming inert over several years. It is also used in food and pharmaceuticals as a sweetener and humectant, respectively, due to its taste and moisture-retaining properties.
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Glycerol is used in the food industry as a sweetener
Glycerol, also known as glycerine or glycerin, is a clear, colourless, viscous, and sweet-tasting liquid. It is a simple triol compound with three hydroxyl groups, belonging to the alcohol family of organic compounds. In the context of its molecular structure and chemical behaviour, glycerol is considered an alcohol due to the presence of multiple hydroxyl (OH) groups. Specifically, it is a trihydroxy alcohol, indicating that it contains three hydroxyl groups.
Glycerol has a variety of applications in different industries, including food, cosmetics, and pharmaceuticals. In the food industry, glycerol serves multiple purposes, one of which is as a sweetener. Glycerol is commonly used as a sugar substitute or sweetener in various food products. It has approximately 27 kilocalories per teaspoon, which is higher than sugar, and it is about 60% as sweet as sucrose. This makes it a useful alternative to sugar, especially in low-fat or reduced-sugar foods.
Glycerol is also used as a humectant, a substance that helps retain moisture. This property is advantageous in maintaining the softness and freshness of baked goods and preventing ice crystal formation in frozen foods, such as low-fat frozen yogurt, ice cream, and other desserts. Its ability to mix with both oil and water-based ingredients makes it an excellent emulsifier, helping to create a smooth and homogeneous mixture in food products.
Additionally, glycerol acts as a solvent, aiding in the extraction of herbs and other botanical constituents. It is often used as an "alcohol-free" alternative to ethanol in tinctures and herbal extractions. Glycerol's preserving properties make it useful in food applications, helping to extend the shelf life of products. It is also added to icing to prevent it from setting too hard and is used as a filler in commercially prepared low-fat foods, such as cookies.
While glycerol has many beneficial uses in the food industry, it is important to note that excessive consumption, especially by children, can lead to glycerol intoxication. Symptoms of intoxication can include hypoglycaemia, nausea, and loss of consciousness. Therefore, it is essential to follow recommended guidelines for consumption to avoid any potential negative effects.
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Frequently asked questions
The molecule of glycerol has three hydroxyl or alcohol groups.
Glycerol, also known as glycerin or glycerine, is a water-absorbent liquid that is 100% soluble in water. It is a combination of sugar and alcohol.
Glycerol has a sweet taste.
