Oxidation of Isohumulones Induces the Formation of Carboxylic Acids by Hydrolytic Cleavage
摘要:
The degradation of isohumulones in mechanistic experiments was investigated. Incubation of trans-isohumulone in the presence of L-proline led to the formation of carboxylic acids and their corresponding proline amides. In the context of isohumulones unknown amides were verified first in model incubations and then in beer for the first time by comparison with authentic reference standards via LC-MS analyses. Carboxylic acids and amides were formed preferably under oxidative conditions and increasing pH. Stable isotope experiments excluded the incorporation of molecular oxygen into carboxylic acids, strongly indicating a hydrolytic mechanism via beta-dicarbonyl cleavage. The proposed mechanism includes oxidation and thereby incorporation of molecular oxygen to the isohumulone ring structure followed by hydrolytic cleavage leading to acids and amides.
COMPOSITIONS AND FOODS FOR IMPROVING LIPID METABOLISM
申请人:KIRIN BEER KABUSHIKI KAISHA
公开号:EP1481671B1
公开(公告)日:2011-08-31
Compositions and foods for improving lipid metabolism
申请人:Yajima Hiroaki
公开号:US20060233902A1
公开(公告)日:2006-10-19
It is intended to provide compositions and foods for use in the treatment, prophylaxis, or amelioration of diseases or symptoms which can be treated, prevented or ameliorated by activating PPAR, in particular, insulin resistant diabetes and hyperlipidemia. Namely, medicinal compositions usable in treating, preventing or improving diseases or symptoms which can be treated, prevented or ameliorated by activation PPAR which contain humulones, isohumulones or lupulones or pharmaceutically acceptable salts or solvates thereof.
TASTE-MASKED DOSAGE FORMS
申请人:MSB Holdings, Inc
公开号:US20210346385A1
公开(公告)日:2021-11-11
Sublingual dosage forms comprising a bitter active ingredient (including sildenafil, tadalafil, tetrahydrocannabinol, and cannabidiol) and a bitterness reducing agent are described. Methods of treating sexual dysfunction by administering the sublingual dosage form to an individual in need thereof are also described.
Oxidation of Isohumulones Induces the Formation of Carboxylic Acids by Hydrolytic Cleavage
作者:Stefan Rakete、Robert Berger、Steffi Böhme、Marcus A. Glomb
DOI:10.1021/jf501826h
日期:2014.7.30
The degradation of isohumulones in mechanistic experiments was investigated. Incubation of trans-isohumulone in the presence of L-proline led to the formation of carboxylic acids and their corresponding proline amides. In the context of isohumulones unknown amides were verified first in model incubations and then in beer for the first time by comparison with authentic reference standards via LC-MS analyses. Carboxylic acids and amides were formed preferably under oxidative conditions and increasing pH. Stable isotope experiments excluded the incorporation of molecular oxygen into carboxylic acids, strongly indicating a hydrolytic mechanism via beta-dicarbonyl cleavage. The proposed mechanism includes oxidation and thereby incorporation of molecular oxygen to the isohumulone ring structure followed by hydrolytic cleavage leading to acids and amides.