Katrina Rosales
Butyric acid, also known as butanoic acid, is a colorless, oily liquid with a pungent odor. It is a type of short-chain fatty acid that is produced by the body and found in foods such as butter, cheese, and milk. Butyric acid is also used in various industrial applications, such as the production of perfumes and artificial flavorings. Due to its potent smell, even a small amount of butyric acid can have a significant impact on the fragrance of a perfume. In this paragraph, we will explore the role of butyric acid in perfumery and its effect on the final scent.
| Characteristics | Values |
|---|---|
| Odor | Unpleasant |
| State | Oily, colorless liquid |
| Boiling Point | 164°C |
| Solubility | Soluble in water, ethanol, and ether |
| Chemical Formula | CH3CH2CH2COOH |
| Use in Perfumes | Used as a fragrance/aroma compound |
| Concentration | A little goes a long way |
| Purchase Options | Available in small quantities from Paul proxisante and Vigon |
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What You'll Learn
Butyric acid is a colourless liquid with a pungent odour
Butyric acid is produced as an end product of the fermentation of sugar by obligate anaerobic bacteria. It was first discovered in 1861 by Louis Pasteur, who found that Clostridium butyricum was the most prominent and main bacterium responsible for its production. However, other organisms such as C. kluyveri, C. beijerinckii, and C. barkeri, among several others, also produce butyric acid.
In humans, butyric acid is one of two primary endogenous agonists of human hydroxycarboxylic acid receptor 2 (HCA2), a Gi/o-coupled G protein-coupled receptor. It is also found in animal fats and vegetable oils, as well as in bovine milk, breast milk, butter, parmesan cheese, and body odour. It has a taste similar to butter and is used as a flavouring agent in food manufacturing.
Due to its powerful odour, butyric acid is used as a fishing bait additive and has also been used as a stink bomb by activist groups. Low-molecular-weight esters of butyric acid, such as methyl butyrate, have pleasant aromas and are used as additives in perfumes, flavourings, varnishes, pharmaceuticals, and disinfectants.
While the exact amount of butyric acid in perfumes is unclear, it is safe to assume that it is used in small, carefully measured quantities to avoid an overpowering odour.
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It is used as a food and perfume additive
Butyric acid, also known as butanoic acid, is a straight-chain alkyl carboxylic acid with the chemical formula CH3CH2CH2COOH. It is an oily, colorless liquid with an unpleasant odour. Despite its disagreeable smell, its low-molecular-weight esters, such as methyl butyrate, often have pleasant aromas or tastes. As a result, they find application as food and perfume additives.
In the food industry, butyric acid is a versatile additive, serving as a flavouring agent, flavour enhancer, and preservative. It imparts a taste reminiscent of lactic acid, often associated with fresh bread, butter, and yogurt. This characteristic flavour contributes to its widespread use in enhancing the taste of food products. Moreover, butyric acid esters are commonly employed as preservatives, helping to enhance fruit aroma. It occurs naturally in many dairy products, such as butter, hard cheeses like Parmesan, milk (especially from goats and sheep), yogurts, cream, and various fermented foods. The name "butyric acid" originates from the ancient Greek word for butter, reflecting its presence in this dairy product.
Butyric acid is also an approved food flavouring in the EU FLAVIS database (number 08.005). It is used in fishing bait additives, with commercially available carp bait flavours using butyric acid as their ester base. The powerful odour of butyric acid makes it effective in attracting fish. Additionally, it has been utilised by organisations like the Sea Shepherd Conservation Society as a stink bomb to disrupt Japanese whaling crews.
Beyond its role in food additives, butyric acid is also used in perfumes. Its esters, which possess pleasant aromas, contribute to its use as a perfume additive. The specific amount or concentration of butyric acid in perfumes may vary depending on the formulation and intended effect.
In summary, butyric acid, with its unique chemical properties, finds application in both the food and perfume industries. Its pleasant-tasting esters and ability to enhance flavours make it a valuable additive in food products, while its esters with pleasant aromas contribute to its use in perfumes.
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It is an important component in the mammalian gut
Butyric acid is a straight-chain alkyl carboxylic acid with the chemical formula CH3CH2CH2COOH. It is an oily, colorless liquid with an unpleasant odor. However, its esters usually have pleasant aromas and tastes and are used as additives in perfumes, food, flavorings, varnishes, pharmaceuticals, and disinfectants.
Butyric acid is an important component in the mammalian gut. It is a short-chain fatty acid produced by beneficial colonic bacteria (probiotics) that feed on, or ferment prebiotics, which are plant products that contain dietary fiber. These short-chain fatty acids benefit the colonocytes by increasing energy production and may protect against colon cancer by inhibiting cell proliferation. Butyrate, a metabolite of butyric acid, is an essential microbial metabolite with a vital role as a modulator of proper immune function in the host. It is a critical mediator of the colonic inflammatory response and has been shown to promote the differentiation of regulatory T cells.
In the gut microbiomes of mammals, omnivores and herbivores have butyrate-producing bacterial communities dominated by the butyryl-CoA:acetate CoA-transferase pathway, while carnivores have communities dominated by the butyrate kinase pathway. The odor of butyric acid, which emanates from the sebaceous follicles of all mammals, works on ticks as a signal.
Butyric acid affects morphology, growth rate, and gene expression in mammalian cells in culture. Sodium butyric acid produces reversible growth inhibition in several mammalian tumor cells in culture, but it causes cell death only in human neuroblastomas and human glioma cells in culture. Butyric acid also regulates oxidative stress index levels, colonic mucus layer distribution, tight junction protein expressions, and immune index levels in the colon.
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It is produced by hydroformylation from propene and syngas
Butyric acid, also known as butanoic acid, is an oily, colorless liquid with an unpleasant odor. Despite its disagreeable smell, its esters have pleasant aromas and tastes, making them popular additives in perfumes and foods.
Butyric acid is produced industrially by hydroformylation from propene and syngas, forming butyraldehyde, which is then oxidized to obtain the final product. The hydroformylation reaction was first discovered by German chemist Otto Roelen in the context of the Fischer-Tropsch process. Syngas, a combination of synthesis gas (CO and H2), and alkenes, is one of the most important syngas-related reactions.
The Ruhrchemie/Rhone-Poulenc process (RCRPP) is a commercially available two-phase system that employs a rhodium catalyst with water-soluble TPPTS as a ligand for the hydroformylation of propene. The reactants, propene and syngas, are combined in a 1.1:1 ratio, yielding a mixture of butyraldehyde and isobutyraldehyde with minimal by-products. The excess olefin and syngas are separated from the aldehyde phase and recycled back into the reactor, contributing to process efficiency.
The choice of catalyst metals and ligands in hydroformylation processes is critical. While cobalt catalysts were historically favored due to their lower cost, rhodium catalysts are now preferred for the hydroformylation of propene despite their higher expense. This preference arises from the lower l/b-butyraldehyde ratio associated with cobalt catalysts, which can be mitigated by using rhodium catalysts or modifying cobalt catalysts with monodentate phosphine ligands. However, the use of phosphine ligands can decrease reactivity and lead to the formation of alcohols and alkanes, which may be acceptable in specific applications.
The hydroformylation of propene has a conversion rate of 98%, and the selectivity for n-butanal is high. This reaction plays a significant role in the production of fine chemicals, including perfumes, showcasing the importance of understanding and optimizing hydroformylation processes for industrial applications.
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It is used in the synthesis of butyrate ester perfumes
Butyric acid, also known as butanoic acid, is a straight-chain alkyl carboxylic acid with the chemical formula CH3CH2CH2COOH. It is a colourless liquid with an unpleasant odour. However, its esters, known as butyrates or butanoates, often have pleasant aromas and are used as additives in perfumes, foods and fishing baits.
Butyric acid was first observed by French chemist Michel Eugène Chevreul in 1814, although it was not until 1818 that he had purified it sufficiently to characterise it. Another French chemist, Henri Braconnot, was also researching the composition of butter and publishing his findings at the same time, which led to disputes about priority. Chevreul claimed that he had found the substance responsible for the smell of butter and, by 1817, he had published some of his findings regarding the properties of butyric acid, naming it.
Butyric acid is not commonly found in nature, but its esters are widespread. For example, ethyl butyrate (also known as ethyl butanoate or butyric ether) is an ester with the chemical formula CH3CH2CH2COOCH2CH3. It has a fruity odour, similar to pineapple, and is commonly used as an artificial flavouring and fragrance. It is used in orange juices, alcoholic beverages, perfumes and plastics.
In industry, butyric acid is produced by hydroformylation from propene and syngas, forming butyraldehyde which is then oxidised to the final product. It can also be produced by several fermentation processes performed by obligate anaerobic bacteria, a pathway discovered by Louis Pasteur in 1861.
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Frequently asked questions
Butyric acid, or butanoic acid, is a straight-chain alkyl carboxylic acid with the chemical formula CH3CH2CH2COOH. It is an oily, colorless liquid with an unpleasant odor.
The amount of butyric acid in perfume varies depending on the specific perfume and its ingredients. However, it is typically used in small quantities due to its potent odor. Some perfumes may contain butyric acid as a synthetic compound, while others may have trace amounts of it as a natural ingredient.
Butyric acid and its esters, known as butyrates or butanoates, have pleasant aromas or tastes when used in low concentrations. They enhance the natural quality of fruit fragrances and are also used as synthetic additives in food and perfume industries.
While butyric acid is generally considered safe, excessive exposure or high concentrations may cause negative reactions in some individuals. It is important to use it in small quantities and dilute it appropriately to avoid any potential hazards.
