丁酸

丁酸
Skeletal structure	Flat structure
	IUPAC名; 丁酸; Butyric acid
别名	butyric acid; propanecarboxylic acid butanoic acid
识别
CAS号	107-92-6
PubChem	264
ChemSpider	259
SMILES	O=C(O)CCC;
InChI	1/C4H8O2/c1-2-3-4(5)6/h2-3H2,1H3,(H,5,6);
InChIKey	FERIUCNNQQJTOY-UHFFFAOYAP
UN编号	2820
ChEBI	30772
DrugBank	DB03568
KEGG	C00246
MeSH	Butyric+acid
IUPHAR配体	1059
性质
化学式	C4H8O2
摩尔质量	88.1051 g·mol⁻¹
外观	无色液体
密度	0.96 g/mL
熔点	-7.9 °C (265.1 K)
沸点	163.5 °C (436.5 K)
溶解性（水）	混溶
pKa	4.82
折光度n; D	1.3980 (19 °C)
黏度	0.1529 cP
危险性
	欧盟危险性符号; 有害 Xn 腐蚀性 C
警示术语	R：R20 R21 R22 R34 R36 R37 R38
MSDS	External MSDS
闪点	72 °C（162 °F）
自燃温度	452 °C（846 °F）
相关物质
相关羧酸	丙酸; 丙烯酸; 丁二酸; 2-羟基丁二酸; 酒石酸; 2-丁烯酸; 反-丁烯二酸; 戊酸
相关化学品	1-丁醇; 丁醛; 丁酸甲酯
	若非注明，所有数据均出自标准状态（25 ℃，100 kPa）下。

丁酸，又称酪酸，是化学式为C H₃CH₂CH₂-COOH的羧酸和短链饱和脂肪酸，存在于腐臭的黄油、帕马森干酪、呕吐物和腋臭中。丁酸带有难闻的气味，味先辣后甜，与乙醚类似。10ppb浓度的丁酸即可被狗嗅出，人则大于10ppm。

丁酸是脂肪酸，在动物脂肪和植物油中以丁酸酯形式存在。其甘油酯占黄油的3~4%，当黄油腐烂后，含有难闻气味的丁酸即通过水解释放出来。它是短链脂肪酸的主要一员。丁酸为弱酸，酸度与乙酸（pK_a=4.76）类似，pK_a为4.82。^[1]该相似性与它们共有的-CH₂COOH末端结构有关。^[2]丁酸密度0.96 g/cm³，摩尔质量88.1051。

丁酸室温下为无色油状液体，-8°C凝固，164°C沸腾。可溶于水、乙醇和乙醚，其水溶液中加入氯化钙会沉淀出丁酸。丁酸被重铬酸钾和硫酸氧化得到二氧化碳和乙酸，被碱性高锰酸钾氧化则得到二氧化碳。丁酸钙（Ca(C₄H₇O₂)₂·H₂O）的溶解度随温度升高而降低。

丁酸的结构异构体为异丁酸，2-甲基丙酸。

生产

工业

在工业中，丁酸是透过丙烯和合成气加氢甲酰化生产、形成丁醛，丁醛被氧化成最终产物。^[3]

H
2 + CO + CH
3CH=CH
2 → CH
3CH
2CH
2CHOoxidation→butyric acid

然而，以这种方式获得的丁酸不能被视为天然产物，因此不用于食品工业中。

发酵

生产天然丁酸的方式为发酵，丁酸可以透过特殊厌氧细菌进行发酵后产生，能产生丁酸的细菌包含梭菌属、丁酸杆菌属、丁酸弧菌属、梭杆菌属...等厌氧微生物，基于商业目的，又以梭菌属为最适合的物种，常见的菌种为丁酸梭菌（酪酸菌）^[4]。

在其他常见的益生菌中，以梭菌属所生产的丁酸量最多、嗜酸乳杆菌能产生少量丁酸，双歧杆菌则不会产生丁酸。^[5]

用途

丁酸在食品、饮料行业应用十分广泛、也可以作为纯酸用于乳制品工业。

丁酸甲酯、丁酸乙酯 (增味剂)：丁酸以酯的形式作为食品添加剂以增加水果香味。^[6]
丁酸钠(补充剂)：丁酸也会制成口服补充剂，多以丁酸钠的形式出现，有研究指出，补充丁酸会改变发炎性肠道疾病患者的肠道微生物群。^[7]

生理效应

丁酸在能量代谢（及糖尿病、肥胖）、炎症反应和免疫反应中有许多作用。丁酸可以被线粒体代谢产生ATP，也可以通过组蛋白修饰酶和G蛋白偶联受体（ FFAR2、FFAR3、HCA2等）产生生理效应。^[8]^[9]

成瘾性

丁酸是I类组蛋白脱乙酰酶选择性拮抗剂。^[10]组蛋白脱乙酰酶作为组蛋白修饰酶，可以抑制基因表达。组蛋白脱乙酰酶可以调节突触形成、突触可塑性，调节长期记忆的形成。I类组蛋白脱乙酰酶已知参与了成瘾性的形成。^[11]^[12]^[13] 丁酸和其他组蛋白脱乙酰酶拮抗剂被用于研究在药物成瘾实验动物中组蛋白脱乙酰酶的基因转录、神经和行为学效应。^[13]^[14]^[15]

参考资料

^ Adimix Sodium Butanoate information (PDF). [2008-05-10]. （原始内容 (PDF)存档于2008-05-27）.
^ Using the pKa table. [2008-05-10]. （原始内容存档于2009-02-08）.
^ Wiley-VCH (编). Ullmann's Encyclopedia of Industrial Chemistry. Carboxylic Acids, Aliphatic 1. Wiley. 2003-03-11 [2024-03-27]. ISBN 978-3-527-30385-4. doi:10.1002/14356007.a05_235. （原始内容存档于2018-03-05）（英语）.
^ Zigová, Jana; Šturdı́k, Ernest; Vandák, Dušan; Schlosser, Štefan. Butyric acid production by Clostridium butyricum with integrated extraction and pertraction. Process Biochemistry. 1999-10, 34 (8) [2024-03-27]. doi:10.1016/S0032-9592(99)00007-2. （原始内容存档于2023-03-14）（英语）.
^ Markowiak-Kopeć, Paulina; Śliżewska, Katarzyna. The Effect of Probiotics on the Production of Short-Chain Fatty Acids by Human Intestinal Microbiome. Nutrients. 2020-04-16, 12 (4) [2024-04-12]. ISSN 2072-6643. PMC 7230973 . PMID 32316181. doi:10.3390/nu12041107. （原始内容存档于2024-04-15）（英语）.
^ He, Guo-qing; Kong, Qing; Chen, Qi-he; Ruan, Hui. Batch and fed-batch production of butyric acid by Clostridium butyricum ZJUCB. Journal of Zhejiang University-SCIENCE B. 2005-11, 6 (11). ISSN 1673-1581. PMC 1390654 . PMID 16252341. doi:10.1631/jzus.2005.B1076 （英语）.
^ Facchin, Sonia; Vitulo, Nicola; Calgaro, Matteo; Buda, Andrea; Romualdi, Chiara; Pohl, Daniel; Perini, Barbara; Lorenzon, Greta; Marinelli, Carla; D’Incà, Renata; Sturniolo, Giacomo Carlo. Microbiota changes induced by microencapsulated sodium butyrate in patients with inflammatory bowel disease. Neurogastroenterology & Motility. 2020-10, 32 (10). ISSN 1350-1925. PMC 7583468 . PMID 32476236. doi:10.1111/nmo.13914 （英语）.
^ Kasubuchi M, Hasegawa S, Hiramatsu T, Ichimura A, Kimura I. Dietary gut microbial metabolites, short-chain fatty acids, and host metabolic regulation. Nutrients. 2015, 7 (4): 2839–49. PMC 4425176 . PMID 25875123. doi:10.3390/nu7042839 . 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.
^ Tilg H, Moschen AR. Microbiota and diabetes: an evolving relationship. Gut. September 2014, 63 (9): 1513–1521. PMID 24833634. S2CID 22633025. doi:10.1136/gutjnl-2014-306928.
^ Offermanns S, Colletti SL, Lovenberg TW, Semple G, Wise A, IJzerman AP. International Union of Basic and Clinical Pharmacology. LXXXII: Nomenclature and Classification of Hydroxy-carboxylic Acid Receptors (GPR81, GPR109A, and GPR109B). Pharmacological Reviews. June 2011, 63 (2): 269–90. PMID 21454438. doi:10.1124/pr.110.003301 .
^ Robison AJ, Nestler EJ. Transcriptional and epigenetic mechanisms of addiction. Nat. Rev. Neurosci. November 2011, 12 (11): 623–637. PMC 3272277 . PMID 21989194. doi:10.1038/nrn3111.
^ Nestler EJ. Epigenetic mechanisms of drug addiction. Neuropharmacology. January 2014,. 76 Pt B: 259–268. PMC 3766384 . PMID 23643695. doi:10.1016/j.neuropharm.2013.04.004.
^ ^13.0 ^13.1 Walker DM, Cates HM, Heller EA, Nestler EJ. Regulation of chromatin states by drugs of abuse. Curr. Opin. Neurobiol. February 2015, 30: 112–121. PMC 4293340 . PMID 25486626. doi:10.1016/j.conb.2014.11.002.
^ Ajonijebu DC, Abboussi O, Russell VA, Mabandla MV, Daniels WM. Epigenetics: a link between addiction and social environment. Cellular and Molecular Life Sciences. August 2017, 74 (15): 2735–2747. PMC 11107568 . PMID 28255755. S2CID 40791780. doi:10.1007/s00018-017-2493-1.
^ Legastelois R, Jeanblanc J, Vilpoux C, Bourguet E, Naassila M. Mécanismes épigénétiques et troubles de l'usage d'alcool : une cible thérapeutique intéressante? [Epigenetic mechanisms and alcohol use disorders: a potential therapeutic target]. Biologie Aujourd'hui. 2017, 211 (1): 83–91. PMID 28682229. doi:10.1051/jbio/2017014  （法语）.

外部链接

国际化学品安全卡1334

[1] Adimix Sodium Butanoate information (PDF). [2008-05-10]. （原始内容 (PDF)存档于2008-05-27）.

[2] Using the pKa table. [2008-05-10]. （原始内容存档于2009-02-08）.

[3] Wiley-VCH (编). Ullmann's Encyclopedia of Industrial Chemistry. Carboxylic Acids, Aliphatic 1. Wiley. 2003-03-11 [2024-03-27]. ISBN 978-3-527-30385-4. doi:10.1002/14356007.a05_235. （原始内容存档于2018-03-05）（英语）.

[4] Zigová, Jana; Šturdı́k, Ernest; Vandák, Dušan; Schlosser, Štefan. Butyric acid production by Clostridium butyricum with integrated extraction and pertraction. Process Biochemistry. 1999-10, 34 (8) [2024-03-27]. doi:10.1016/S0032-9592(99)00007-2. （原始内容存档于2023-03-14）（英语）.

[5] Markowiak-Kopeć, Paulina; Śliżewska, Katarzyna. The Effect of Probiotics on the Production of Short-Chain Fatty Acids by Human Intestinal Microbiome. Nutrients. 2020-04-16, 12 (4) [2024-04-12]. ISSN 2072-6643. PMC 7230973 . PMID 32316181. doi:10.3390/nu12041107. （原始内容存档于2024-04-15）（英语）.

[6] He, Guo-qing; Kong, Qing; Chen, Qi-he; Ruan, Hui. Batch and fed-batch production of butyric acid by Clostridium butyricum ZJUCB. Journal of Zhejiang University-SCIENCE B. 2005-11, 6 (11). ISSN 1673-1581. PMC 1390654 . PMID 16252341. doi:10.1631/jzus.2005.B1076 （英语）.

[7] Facchin, Sonia; Vitulo, Nicola; Calgaro, Matteo; Buda, Andrea; Romualdi, Chiara; Pohl, Daniel; Perini, Barbara; Lorenzon, Greta; Marinelli, Carla; D’Incà, Renata; Sturniolo, Giacomo Carlo. Microbiota changes induced by microencapsulated sodium butyrate in patients with inflammatory bowel disease. Neurogastroenterology & Motility. 2020-10, 32 (10). ISSN 1350-1925. PMC 7583468 . PMID 32476236. doi:10.1111/nmo.13914 （英语）.

[Review_–_General_summary_as_of_April_2015-8] Kasubuchi M, Hasegawa S, Hiramatsu T, Ichimura A, Kimura I. Dietary gut microbial metabolites, short-chain fatty acids, and host metabolic regulation. Nutrients. 2015, 7 (4): 2839–49. PMC 4425176 . PMID 25875123. doi:10.3390/nu7042839 . 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.

[Review_for_diabetes-9] Tilg H, Moschen AR. Microbiota and diabetes: an evolving relationship. Gut. September 2014, 63 (9): 1513–1521. PMID 24833634. S2CID 22633025. doi:10.1136/gutjnl-2014-306928.

[IUPHAR's_comprehensive_2011_review_on_HCARs-10] Offermanns S, Colletti SL, Lovenberg TW, Semple G, Wise A, IJzerman AP. International Union of Basic and Clinical Pharmacology. LXXXII: Nomenclature and Classification of Hydroxy-carboxylic Acid Receptors (GPR81, GPR109A, and GPR109B). Pharmacological Reviews. June 2011, 63 (2): 269–90. PMID 21454438. doi:10.1124/pr.110.003301 .

[Nestler-11] Robison AJ, Nestler EJ. Transcriptional and epigenetic mechanisms of addiction. Nat. Rev. Neurosci. November 2011, 12 (11): 623–637. PMC 3272277 . PMID 21989194. doi:10.1038/nrn3111.

[Nestler_2014_epigenetics-12] Nestler EJ. Epigenetic mechanisms of drug addiction. Neuropharmacology. January 2014,. 76 Pt B: 259–268. PMC 3766384 . PMID 23643695. doi:10.1016/j.neuropharm.2013.04.004.

[Chromatin_states-13] 13.0 ^13.1 Walker DM, Cates HM, Heller EA, Nestler EJ. Regulation of chromatin states by drugs of abuse. Curr. Opin. Neurobiol. February 2015, 30: 112–121. PMC 4293340 . PMID 25486626. doi:10.1016/j.conb.2014.11.002.

[pmid28255755-14] Ajonijebu DC, Abboussi O, Russell VA, Mabandla MV, Daniels WM. Epigenetics: a link between addiction and social environment. Cellular and Molecular Life Sciences. August 2017, 74 (15): 2735–2747. PMC 11107568 . PMID 28255755. S2CID 40791780. doi:10.1007/s00018-017-2493-1.

[pmid28682229-15] Legastelois R, Jeanblanc J, Vilpoux C, Bourguet E, Naassila M. Mécanismes épigénétiques et troubles de l'usage d'alcool : une cible thérapeutique intéressante? [Epigenetic mechanisms and alcohol use disorders: a potential therapeutic target]. Biologie Aujourd'hui. 2017, 211 (1): 83–91. PMID 28682229. doi:10.1051/jbio/2017014  （法语）.

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