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| Section2 = | Section3 = }} Piperine, along with its isomer chavicine, is the alkaloid〔''Merck Index'', 11th Edition, 7442〕 responsible for the pungency of black pepper and long pepper. It has also been used in some forms of traditional medicine and as an insecticide. Piperine forms monoclinic needles, is slightly soluble in water (1 g/25 L (18 °C)), and is highly soluble in alcohol (1 g/15 mL), ether (1 g/36 mL) and chloroform (1 g/1.7 mL). The solution in alcohol has a pepper-like taste. ==Preparation== Piperine is commercially available. If desired, it may be extracted from black pepper using dichloromethane. Aqueous hydrotopes can be used in the extraction to result in high yield and selectivity.〔Gaikar. Process for extraction of piperine from piper species. US 6365601, April 2, 2002.〕 The amount of piperine varies from 1-2% in long pepper, to 5-10% in commercial white and black peppers.〔http://www.tis-gdv.de/tis_e/ware/gewuerze/pfeffer/pfeffer.htm#selbsterhitzung〕 Further, it may be prepared by treating the solvent-free residue from an alcoholic extract of black pepper, with a solution of potassium hydroxide to remove resin (said to contain chavicine, an isomer of piperine) and solution of the washed, insoluble residue in warm alcohol, from which the alkaloid crystallises on cooling. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「piperine」の詳細全文を読む スポンサード リンク
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