Butyric acid, 1-Propanecarboxylic acid, Propanecarboxylic acid, C4:0 (Lipid numbers)
|Jmol 3D model||Interactive image
|Molar mass||88.11 g·mol−1|
|Odor||Unpleasant and obnoxious|
|Density||1.135 g/cm3 (−43 °C)
0.9528 g/cm3 (25 °C)
|Melting point||−5.1 °C (22.8 °F; 268.0 K)|
|Boiling point||163.75 °C (326.75 °F; 436.90 K)|
|Sublimes at −35 °C
|Solubility||Slightly soluble in CCl4
Miscible with ethanol, ether
|Vapor pressure||0.112 kPa (20 °C)
0.74 kPa (50 °C)
9.62 kPa (100 °C)
|Thermal conductivity||1.46·105 W/m·K|
Refractive index (nD)
|1.398 (20 °C)|
|Viscosity||1.814 cP (15 °C)
1.426 cP (25 °C)
|Monoclinic (−43 °C)|
a = 8.01 Å, b = 6.82 Å, c = 10.14 Å
α = 90°, β = 111.45°, γ = 90°
|0.93 D (20 °C)|
Std enthalpy of
Std enthalpy of
|Safety data sheet||External MSDS|
|GHS signal word||Danger|
|P280, P305+351+338, P310|
EU classification (DSD)
|R-phrases||R20/21/22, R34, R36/37/38|
|S-phrases||S26, S36, S45|
|Flash point||71 to 72 °C (160 to 162 °F; 344 to 345 K)|
|440 °C (824 °F; 713 K)|
|Lethal dose or concentration (LD, LC):|
LD50 (median dose)
|2000 mg/kg (oral, rat)|
Related Carboxylic acids
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Butyric acid (from Greek βούτῡρον, meaning "butter"), also known under the systematic name butanoic acid, abbreviated BTA, is a carboxylic acid with the structural formula CH3CH2CH2-COOH. Salts and esters of butyric acid are known as butyrates or butanoates. Butyric acid is found in milk, especially goat, sheep and buffalo milk, butter, parmesan cheese, and as a product of anaerobic fermentation (including in the colon and as body odor). It is also found in milk chocolate produced by the Hershey process, or added to imitate the flavour of Hershey's chocolate. Butyric acid is present in, and is the main distinctive smell of, human vomit. It has an unpleasant smell and acrid taste, with a sweetish aftertaste similar to ether. It can be detected by mammals with good scent detection abilities such as dogs at 10 parts per billion, whereas humans can detect it in concentrations above 10 parts per million.
Butyric acid was first observed in impure form in 1814 by the French chemist Michel Eugène Chevreul. By 1818, he had purified it sufficiently to characterize it. However, Chevreul did not publish his early research on butyric acid; instead, he deposited his findings in manuscript form with the secretary of the Academy of Sciences in Paris, France. Henri Braconnot, a French chemist, was also researching the composition of butter and was publishing his findings, and this led to disputes about priority. As early as 1815, Chevreul claimed that he had found the substance responsible for the smell of butter. By 1817, he published some of his findings regarding the properties of butyric acid and named it. However, it was not until 1823 that he presented the properties of butyric acid in detail. The name of butyric acid comes from the Latin word for butter, butyrum (or buturum), the substance in which butyric acid was first found.
- 1 Chemistry
- 2 Production
- 3 Uses
- 4 Biochemistry
- 5 Pharmacology
- 6 Research
- 7 See also
- 8 References
- 9 External links
Butyric acid is a fatty acid occurring in the form of esters in animal fats. The triglyceride of butyric acid makes up 3–4% of butter. When butter goes rancid, butyric acid is liberated from the glyceride by hydrolysis, leading to the unpleasant odor. It is an important member of the fatty acid subgroup called short-chain fatty acids. Butyric acid is a medium-strong acid that reacts with bases and strong oxidants, and attacks many metals.
The acid is an oily, colorless liquid that is easily soluble in water, ethanol, and ether, and can be separated from an aqueous phase by saturation with salts such as calcium chloride. It is oxidized to carbon dioxide and acetic acid using potassium dichromate and sulfuric acid, while alkaline potassium permanganate oxidizes it to carbon dioxide. The calcium salt, Ca(C4H7O2)2·H2O, is less soluble in hot water than in cold.
Personal protective equipment such as rubber or PVC gloves, protective eye goggles, and chemical-resistant clothing and shoes are used to minimize risks when handling butyric acid.
Inhalation of butyric acid may result in soreness of throat, coughing, a burning sensation, and laboured breathing. Ingestion of the acid may result in abdominal pain, shock, and collapse. Physical exposure to the acid may result in pain, blistering and skin burns, while exposure to the eyes may result in pain, severe deep burns and loss of vision.
It is industrially prepared by the fermentation of sugar or starch, brought about by the addition of putrefying cheese, with calcium carbonate added to neutralize the acids formed in the process. The butyric fermentation of starch is aided by the direct addition of Bacillus subtilis. Salts and esters of the acid are called butyrates or butanoates.
Butyric acid or fermentation butyric acid is also found as a hexyl ester hexyl butyrate in the oil of Heracleum giganteum (a type of hogweed) and as the octyl ester octyl butyrate in parsnip (Pastinaca sativa); it has also been noticed in skin flora and perspiration.
Butyric acid is used in the preparation of various butyrate esters. Low-molecular-weight esters of butyric acid, such as methyl butyrate, have mostly pleasant aromas or tastes. As a consequence, they are used as food and perfume additives. It is also used as an animal feed supplement due to the ability to reduce pathogenic bacterial colonization. It is an approved food flavoring in the EU FLAVIS database (number 08.005).
Due to its powerful odor, it has also been used as a fishing bait additive. Many of the commercially available flavors used in carp (Cyprinus carpio) baits use butyric acid as their ester base; however, it is not clear whether fish are attracted by the butyric acid itself or the substances added to it. Butyric acid was, however, one of the few organic acids shown to be palatable for both tench and bitterling.
|This section is missing information about 2 additional metabolic pathways: . (May 2015)|
Butyrate is produced as end-product of a fermentation process solely performed by obligate anaerobic bacteria. Fermented Kombucha "tea" includes butyric acid as a result of the fermentation. This fermentation pathway was discovered by Louis Pasteur in 1861. Examples of butyrate-producing species of bacteria:
- Clostridium butyricum
- Clostridium kluyveri
- Clostridium pasteurianum
- Faecalibacterium prausnitzii
- Fusobacterium nucleatum
- Butyrivibrio fibrisolvens
- Eubacterium limosum
The pathway starts with the glycolytic cleavage of glucose to two molecules of pyruvate, as happens in most organisms. Pyruvate is then oxidized into acetyl coenzyme A using a unique mechanism that involves an enzyme system called pyruvate:ferredoxin oxidoreductase. Two molecules of carbon dioxide (CO2) and two molecules of elemental hydrogen (H2) are formed as waste products from the cell. Then,
|Acetyl coenzyme A converts into acetoacetyl coenzyme A||acetyl-CoA-acetyl transferase|
|Acetoacetyl coenzyme A converts into β-hydroxybutyryl CoA||β-hydroxybutyryl-CoA dehydrogenase|
|β-hydroxybutyryl CoA converts into crotonyl CoA||crotonase|
|Crotonyl CoA converts into butyryl CoA (CH3CH2CH2C=O-CoA)||butyryl CoA dehydrogenase|
|A phosphate group replaces CoA to form butyryl phosphate||phosphobutyrylase|
|The phosphate group joins ADP to form ATP and butyrate||butyrate kinase|
ATP is produced, as can be seen, in the last step of the fermentation. Three molecules of ATP are produced for each glucose molecule, a relatively high yield. The balanced equation for this fermentation is
- C6H12O6 → C4H8O2 + 2 CO2 + 2 H2.
- Clostridium acetobutylicum, the most prominent acetone and propianol producer, used also in industry
- Clostridium beijerinckii
- Clostridium tetanomorphum
- Clostridium aurantibutyricum
These bacteria begin with butyrate fermentation, as described above, but, when the pH drops below 5, they switch into butanol and acetone production to prevent further lowering of the pH. Two molecules of butanol are formed for each molecule of acetone.
The change in the pathway occurs after acetoacetyl CoA formation. This intermediate then takes two possible pathways:
- acetoacetyl CoA → acetoacetate → acetone
- acetoacetyl CoA → butyryl CoA → butyraldehyde → butanol
Highly-fermentable fiber residues, such as those from resistant starch, oat bran, pectin, and guar are transformed by colonic bacteria into short-chain fatty acids (SCFA) including butyrate, producing more SCFA than less fermentable fibers such as celluloses. One study found that resistant starch consistently produces more butyrate than other types of dietary fiber. The production of SCFA from fibers in ruminant animals such as cattle is responsible for the butyrate content of milk and butter.
Fructans are another source of prebiotic soluble dietary fibers. They are often found in the soluble fibers of foods which are high in sulfur, such as the Allium and Cruciferous vegetables. Sources of fructans include wheat (although some wheat strains such as spelt contain lower amounts), rye, barley, onion, garlic, Jerusalem and globe artichoke, asparagus, beetroot, chicory, dandelion leaves, leek, radicchio, the white part of spring onion, broccoli, brussels sprouts, cabbage, fennel and prebiotics such as fructooligosaccharides (FOS), oligofructose and inulin. While many of these foods lack in butyrate production compared to resistant starch, they do have a number of benefits. They generally possess a low glycemic index which appeals well to diabetics. They also appeal to those on the ketogenic diet who benefit from beta-Hydroxybutyric acid, which is a HDAC inhibitor which can cross the blood brain barrier and be used as fuel in the mitochondria of brain cells. Other HDAC inhibitors in these butyrate producing foods are sulforaphane, which has promise in inhibiting human breast cancer cells. Sulforaphane has also been shown to promote hair growth in mice, it contains compounds which prevent ulcers, and helps with cognitive function in rats. It is good to note that sulforaphane in broccoli is destroyed if prepared improperly. Diallyl disulfide found in the fructans containing garlic has been shown to reduce chemical toxicity and carcinogenesis in rodents, and shows synergestic benefits with butyrate when it comes to inhibiting the growth of human cancer tumor cells in the colon.
|Inhibited enzyme||IC50 (nM)||Entry note|
|GPCR target||pEC50||Entry note|
|NIACR1||missing data||Full agonist|
Like other short chain fatty acids (SCFAs), butyrate is an agonist at the free fatty acid receptors FFAR2 and FFAR3, which function as nutrient sensors which help regulate energy balance; unlike the other SCFAs, butyrate is also an agonist of niacin receptor 1. Butyric acid is also utilized by mitochondria, particularly in colonocytes, to generate adenosine triphosphate (ATP) during fatty acid metabolism. Butyric acid is also an HDAC inhibitor (specifically, HDAC1, HDAC2, HDAC3, and HDAC8), a drug that inhibits the function of histone deacetylase enzymes, thereby favoring an acetylated state of histones in cells. Acetylated histones have a lower affinity for DNA than nonacetylated histones, due to the neutralization of electrostatic charge interactions. In general, it is thought that transcription factors will be unable to access regions where histones are tightly associated with DNA (i.e., nonacetylated, e.g., heterochromatin). Therefore, butyric acid is thought to enhance the transcriptional activity at promoters, which are typically silenced or downregulated due to histone deacetylase activity.
|This section requires expansion. (May 2015)|
Butyric acid is metabolized by various human XM-ligases (ACSM1, ACSM2B, ASCM3, ACSM4, ACSM5, and ACSM6), also known as butyrate–CoA ligase. The metabolite produced by this reaction is butyryl–CoA, and is produced as follows:
- Adenosine triphosphate + Butyric acid + Coenzyme A → Adenosine monophosphate + Pyrophosphate + Butyryl-CoA
- Tributyrin + H20 = Dibutyrin + Butyrate
Peripheral therapeutic effects
Butyrate has numerous beneficial effects in humans on energy homeostasis and related diseases (diabetes and obesity), inflammation, and immune function (e.g., it has pronounced antimicrobial and anticarcinogenic effects). These effects occur through its utilization by mitochondria to generate ATP during fatty acid metabolism or through one or more of its histone-modifying enzyme targets (i.e., the class I histone deacetylases) and G-protein coupled receptor targets (i.e., FFAR2, FFAR3, and NIACR1).
Immunomodulation and inflammation
Butyrate's effects on the immune system are mediated through the inhibition of class I histone deacetylases and activation of its G-protein coupled receptor targets: NIACR1 (GPR109A), FFAR2 (GPR43), and FFAR3 (GPR41). Among the short-chain fatty acids, butyrate is the most potent promoter of intestinal regulatory T cells in vitro and the only one among the group that is an NIACR1 ligand. It has been shown to be a critical mediator of the colonic inflammatory response. It possesses both preventive and therapeutic potential to counteract inflammation-mediated ulcerative colitis and colorectal cancer.
Butyrate has established antimicrobial properties in humans that are mediated through the antimicrobial peptide LL-37, which it induces via HDAC inhibition on histone H3. Butyrate increases gene expression of FOXP3 (the transcription regulator for Tregs) and promotes colonic regulatory T cells (Tregs) through the inhibition of class I histone deacetylases; through these actions, it increases the expression of interleukin 10, an anti-inflammatory cytokine. Butyrate also suppresses colonic inflammation by inhibiting the IFN-γ–STAT1 signaling pathways, which is mediated partially through histone deacetylase inhibition. While transient IFN-γ signaling is generally associated with normal host immune response, chronic IFN-γ signaling is often associated with chronic inflammation. It has been shown that butyrate inhibits activity of HDAC1 that is bound to the Fas gene promoter in T cells, resulting in hyperacetylation of the Fas promoter and up-regulation of Fas receptor on the T-cell surface. It is thus suggested that butyrate enhances apoptosis of T cells in the colonic tissue and thereby eliminates the source of inflammation (IFN-γ production).
Similar to other NIACR1 agonists, butyrate also produces marked anti-inflammatory effects in a variety of tissues, including the brain, gastrointestinal tract, skin, and vascular tissue. Butyrate binding at FFAR3 induces neuropeptide Y release and promotes the functional homeostasis of colonic mucosa and the enteric immune system.
Butyric acid is important as an energy (ATP) source for cells lining the mammalian colon (colonocytes). Without butyric acid for energy, colon cells undergo upregulated autophagy (i.e., self-digestion).
Butyrate produces different effects in healthy and cancerous cells; this is known as the "butyrate paradox". In particular, butyrate inhibits colonic tumor cells and promotes healthy colonic epithelial cells. The signaling mechanism is not well understood. A review suggested that the chemopreventive benefits of butyrate depend in part on the amount, time of exposure with respect to the tumorigenic process, and type of fat in the diet. The production of volatile fatty acids such as butyrate from fermentable fibers may contribute to the role of dietary fiber in colon cancer. Short-chain fatty acids, which include butyric acid, are produced by beneficial colonic bacteria (probiotics) that feed on, or ferment prebiotics, which are plant products that contain adequate amounts of dietary fiber. These short-chain fatty acids benefit the colonocytes by increasing energy production and cell proliferation, and may protect against colon cancer.
Conversely, some researchers have sought to eliminate butyrate and consider it a potential cancer driver. Studies in mice indicate it drives transformation of MSH2-deficient colon epithelial cells. It is important to note that these are related to a gene deficiency. Niacin, beta-hydroxybutyrate, and curcumin may be effective adjunct treatments if genetic issues are present.
A review on the relationship between the microbiome and diabetes asserted that butyrate can induce "profound immunometabolic effects" in animal models and humans with type 2 diabetes; it also noted a relationship between the presence of obesity or diabetes and a state of marked dysbiosis in a host, which is not yet completely understood. While acknowledging that there is strong evidence for the use of butyrate in such disorders, the review called for more research into the pathophysiology (i.e., biomolecular mechanisms) of these diseases, so as to improve therapeutic approaches to these diseases.
The observation of a large number of downregulated genes after methamphetamine withdrawal is consistent with previous results showing that methamphetamine can cause increased expression of histone deacetylases (HDACs) in the nucleus accumbens and the dorsal striatum. Butyric acid is a HDAC inhibitor. HDACs are enzymes that can cause histone deacetylation and repression of gene expression. HDACs are important regulators of synaptic formation, synaptic plasticity, and long-term memory formation. Several HDACs also appear to play significant roles in various models of drug abuse and addiction. The local knockout of HDAC1, as well as chronic and continuous infusion of MS-275, a pharmacological inhibitor highly selective in vitro for HDAC1, has been found with NAc suppressed cocaine-induced locomotor sensitization in mice. HDAC3 inhibitor RGFP966 has been shown to facilitate the extinction of cocaine-seeking behavior and prevent reinstatement of cocaine-conditioned place preference in mice. Histone deacetylase inhibitors have been shown to decrease cocaine, but not sucrose, self-administration in rats. The beneficial bacteria that ferment probiotics and prebiotics to produce butyric acid have been shown to regulate behavior by means of the vagus nerve.
Cognitive deficits and memory
Studies in rodents have found that the environment exerts an influence on epigenetic changes related to cognition, in terms of learning and memory; environmental enrichment is correlated with increased histone acetylation, and verification by administering histone deacetylase inhibitors induced the sprouting of dendrites, an increased number of synapses, and reinstated learning behaviour and access to long-term memories. Research has also linked learning and long-term memory formation to reversible epigenetic changes in the hippocampus and cortex in animals with normal-functioning, undamaged brains. In human studies, post-mortem brains from Alzheimer's patients show increased histone de-acetylase levels.
- Histone acetylase
- Histone deacetylase
- Histone-modifying enzyme
- Indole-3-butyric acid
- Acids in wine
- Gamma-Hydroxybutyric acid
- Beta-Hydroxybutyric acid
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Short-chain fatty acids (SCFAs) such as acetate, butyrate, and propionate, which are produced by gut microbial fermentation of dietary fiber, are recognized as essential host energy sources and act as signal transduction molecules via G-protein coupled receptors (FFAR2, FFAR3, OLFR78, GPR109A) and as epigenetic regulators of gene expression by the inhibition of histone deacetylase (HDAC). Recent evidence suggests that dietary fiber and the gut microbial-derived SCFAs exert multiple beneficial effects on the host energy metabolism not only by improving the intestinal environment, but also by directly affecting various host peripheral tissues.
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Recent studies have suggested that gut bacteria play a fundamental role in diseases such as obesity, diabetes and cardiovascular disease. Data are accumulating in animal models and humans suggesting that obesity and type 2 diabetes (T2D) are associated with a profound dysbiosis. First human metagenome-wide association studies demonstrated highly significant correlations of specific intestinal bacteria, certain bacterial genes and respective metabolic pathways with T2D. Importantly, especially butyrate-producing bacteria such as Roseburia intestinalis and Faecalibacterium prausnitzii concentrations were lower in T2D subjects. This supports the increasing evidence, that butyrate and other short-chain fatty acids are able to exert profound immunometabolic effects.
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The establishment of a link between light therapy, vitamin D and human cathelicidin LL-37 expression provides a completely different way for infection treatment. Instead of treating patients with traditional antibiotics, doctors may be able to use light or vitamin D [291,292]. Indeed using narrow-band UV B light, the level of vitamin D was increased in psoriasis patients (psoriasis is a common autoimmune disease on skin) . In addition, other small molecules such as butyrate can induce LL-37 expression . Components from Traditional Chinese Medicine may regulate the AMP expression as well . These factors may induce the expression of a single peptide or multiple AMPs . It is also possible that certain factors can work together to induce AMP expression. While cyclic AMP and butyrate synergistically stimulate the expression of chicken β-defensin 9 , 4-phenylbutyrate (PBA) and 1,25-dihydroxyvitamin D3 (or lactose) can induce AMP gene expression synergistically [294,298]. It appears that stimulation of LL-37 expression by histone deacetylase (HDAC) inhibitors is cell dependent. Trichostatin and sodium butyrate increased the peptide expression in human NCI-H292 airway epithelial cells but not in the primary cultures of normal nasal epithelial cells . However, the induction of the human LL-37 expression may not be a general approach for bacterial clearance. During Salmonella enterica infection of human monocyte-derived macrophages, LL-37 is neither induced nor required for bacterial clearance .
Table 3: Select human antimicrobial peptides and their proposed targets
Table 4: Some known factors that induce antimicrobial peptide expression
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Specific species that have been recognized by their high levels of butyrate production include Faecalibacterium prausnitzii and the cluster IV and XIVa of genus Clostridium ... Administration of acetate, propionate, and butyrate in drinking water mimics the effect of Clostridium colonization in germ-free mice, resulting in an elevated Treg frequency in the colonic lamina propria and increased IL-10 production by these Tregs (180, 182). Of the three main SCFAs, butyrate has been found to be the most potent inducer of colonic Tregs. Mice fed a diet enriched in butyrylated starches have more colonic Tregs than those fed a diet containing propinylated or acetylated starches (181). Arpaia et al. tested an array of SCFAs purified from commensal bacteria and confirmed butyrate was the strongest SCFA-inducer of Tregs in vitro (180). Mechanistically, it has been proposed that butyrate, and possibly propionate, promote Tregs through inhibiting histone deacetylase (HDAC), causing increased acetylation of histone H3 in the Foxp3 CNS1 region, and thereby enhancing FOXP3 expression (180, 181). Short-chain fatty acids partially mediate their effects through G-protein coupled receptors (GPR), including GPR41, GPR43, and GPR109A. GPR41 and GPR43 are stimulated by all three major SCFAs (191), whereas GPR109A only interacts with butyrate (192).
Figure 1: Microbial-derived molecules promote colonic Treg differentiation.
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