نتایج جستجو برای: 5 caffeoyl quinic acid

تعداد نتایج: 1845563  

Journal: :Journal of general microbiology 1984
A R Hawkins A J Francisco da Silva C F Roberts

The first three steps in quinic acid degradation in Aspergillus nidulans are catalysed by highly inducible enzymes encoded by a gene cluster regulated by an adjacent control region. Analysis of two non-inducible mutants has been done in diploid strains, where qutA8 is recessive and all three enzyme activities are fully induced in heterozygous qutA8/qutA+ diploids. In contrast, qutA4/qutA+ heter...

Journal: :The Biochemical journal 1970
B E Ellis G H Towers

The biogenesis of rosmarinic acid (alpha-O-caffeoyl-3,4-dihydroxyphenyl-lactic acid), the second most common ester of caffeic acid in the plant kingdom, was studied in Mentha arvense and Mentha piperita. Administration of (14)C-labelled compounds showed that, whereas the caffeoyl moiety was formed from phenylalanine via cinnamic acid and p-coumaric acid, the 3,4-dihydroxyphenyl-lactic acid moie...

Journal: :Biomacromolecules 2011
Céline J Besset Alexander T Lonnecker Jennifer M Streff Karen L Wooley

Strategies for the preparation of polycarbonates, derived from natural polyhydroxy monomeric repeat units, were developed for biosourced polycarbonates based on quinic acid. The design and synthesis of regioselectively tert-butyldimethylsilyloxy (TBS)-protected 1,4- and 1,5-diol monomers of quinic acid were followed by optimization of their copolymerizations with phosgene, generated in situ fro...

Journal: :Plant physiology 1998
K Inoue V J Sewalt G B Murray W Ni C Stürzer R A Dixon

The biosynthesis of monolignols can potentially occur via two parallel pathways involving free acids or their coenzyme A (CoA) esters. Caffeic acid 3-O-methyltransferase (COMT) and caffeoyl CoA 3-O-methyltransferase (CCOMT) catalyze functionally identical reactions in these two pathways, resulting in the formation of mono- or dimethoxylated lignin precursors. The activities of the two enzymes i...

Journal: :Molecules 2016
Wenbing Ding Ye Li Guanhua Li Hualiang He Zhiwen Li Youzhi Li

Three new 30-noroleanane triterpenoid saponins, akebonoic acid 28-O-β-d-glucopyranosyl-(1''→6')-β-d-glucopyranosyl ester (1), akebonoic acid 28-O-(6''-O-caffeoyl)-β-d-glucopyranosyl-(1''→6')-β-d-glucopyranosyl ester (Holboelliside A, 2) and 3β,20α,24-trihydroxy-29-norolean-12-en-28-oic acid 3-O-(6'-O-caffeoyl)-β-d-glucopyranoside (Holboelliside B, 3) were isolated from the stems of Holboellia c...

Journal: :Bioorganic & medicinal chemistry letters 2013
Seung Young Lee Eunjung Moon Sun Yeou Kim Kang Ro Lee

Five new quinic acid derivatives (1-5), together with 10 known quinic acid derivatives (6-15), were isolated from the MeOH extract of Pimpinella brachycarpa (Umbelliferae). Their structures were established on the basis of spectroscopic analyses including extensive 2D NMR studies (COSY, HMQC and HMBC). Isolated compounds 1-15 were evaluated for their inhibitory activities on nitric oxide (NO) p...

Journal: :Journal of chromatographic science 2004
Hongjuan Yang Bo Yuan Lei Li Huashan Chen Famei Li

A simple and sensitive high-performance liquid chromatography (HPLC) method has been developed for the determination of chlorogenic acid (3-O-caffeoyl-D-quinic acid) in plasma and applied to its pharmacokinetic study in rabbits after administration of Flos Lonicerae extract. Plasma samples are extracted with methanol. HPLC analysis of the extracts is performed on a C(18) reversed-phase column u...

Journal: :Journal of Chemistry 2022

Cyclocarya paliurus (Batal.) Iljinskaja (LCP) leaves have been widely employed in food and traditional medicine for treating hyperlipidaemia its complications, possibly owing to their antioxidant properties. The aim of the present study is identify chemical ingredients extracts from LCP by using UHPLC-Q-Orbitrap-MS/MS-based molecular networking, a very recent useful tool annotation constituents...

Journal: :Molecules 2008
Mareike Maas Frank Petereit Andreas Hensel

From the ethyl acetate soluble fraction of a methanol/water extract of the herb Eupatorium perfoliatum L. (Asteraceae) six caffeic acid derivatives have been isolated and identified by 1D- and 2D-NMR spectroscopic data. Besides the common quinic acid derivatives 5-caffeoylquinic acid (chlorogenic acid), 3-caffeoylquinic acid (neochlorogenic acid) and 3,5-dicaffeoylquinic acid, three up to now u...

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