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显示 1-29 共 29 条结果 关于 "220108" 范围 论文
Wojciech Ostrowski et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 967, 21-27 (2014-07-27)
Liquid chromatography coupled to mass spectrometry (MS) with electrospray ionization (ESI) is one of analytical techniques to obtain accurate results of low molecular weight aromatic compounds in biological samples of different origin. The interpretations of mass spectra of these aromatic
I Reenilä et al.
Journal of chromatography. B, Biomedical applications, 663(1), 137-142 (1995-01-06)
We applied coulometric detection (three electrochemical electrodes in series) to quantitate vanillic acid and isovanillic acid using reversed-phase HPLC. The formation of these reaction products from dihydroxybenzoic acid was used as a precise and reproducible measure of catechol-O-methyltransferase (COMT) activity
Georgios I Panoutsopoulos et al.
Pharmacology, 73(4), 199-208 (2005-01-04)
Aromatic aldehydes are good substrates of aldehyde dehydrogenase activity but are relatively poor substrates of aldehyde oxidase and xanthine oxidase. However, the oxidation of xenobiotic-derived aromatic aldehydes by the latter enzymes has not been studied to any great extent. The
Miguel A Providenti et al.
Journal of bacteriology, 188(11), 3862-3869 (2006-05-19)
In Comamonas testosteroni strain BR6020, metabolism of isovanillate (iVan; 3-hydroxy-4-methoxybenzoate), vanillate (Van; 4-hydroxy-3-methoxybenzoate), and veratrate (Ver; 3,4-dimethoxybenzoate) proceeds via protocatechuate (Pca; 3,4-dihydroxybenzoate). A 13.4-kb locus coding for the catabolic enzymes that channel the three substrates to Pca was cloned. O
Ecem Evrim Çelik et al.
Food research international (Ottawa, Ont.), 108, 286-294 (2018-05-08)
The interactions of coffee and bread crust melanoidins with hydroxycinnamic and hydroxybenzoic acids (HCA/HBA) containing different numbers of -OH and -OCH₃ groups localized at different positions on the aromatic ring were investigated. By doing so, mechanism of the interactions was
Qi-kang Ya et al.
Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials, 33(8), 1254-1256 (2011-01-11)
To study the chemical constituent from the antithrombus activity extract of Radix Aerio Fici Microcarpae. The isolation and purification of the extract were conducted by means of silica gel column chromatography, polyamide column chromatography and recrytallization. The structures of these
M I Donnelly et al.
Journal of bacteriology, 142(3), 916-924 (1980-06-01)
When grown at the expense of 3,4,5-trimethoxybenzoic acid, a strain of Pseudomonas putida oxidized this compound and also 3,5-dimethoxy-4-hydroxybenzoic (syringic) and 3,4-dihydroxy-5-methoxybenzoic (3-O-methylgallic) acids; but other hydroxy- or methoxy-benzoic acids were oxidized slowly or not at all. Radioactivity appeared exclusively
Motohiro Nishimura et al.
Journal of bioscience and bioengineering, 102(2), 124-127 (2006-10-10)
Strain NL15-2K was isolated from soil by screening for bacteria capable of catabolizing lignin-related aromatic acids. This isolate was identified as a Streptomyces sp. on the basis of morphology and an analysis of its 16S rRNA gene sequence. NL15-2K utilized
Jing-Jing Zhu et al.
Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica, 31(20), 1691-1693 (2007-01-18)
To investigate the active constituents from Rumex dentatus. Compounds were isolated by silica gel, Sephadex LH -20 and ODS column chromatography and identified by chemical and spectroscopic methods. Ten compounds were obtained and identified as helonioside A (1), gallic acid
Gema Pereira-Caro et al.
Free radical biology & medicine, 160, 784-795 (2020-09-15)
The health benefits of orange juice (OJ) consumption are attributed in part to the circulating flavanone phase II metabolites and their microbial-derived ring fission phenolic catabolites. The present study investigated these compounds in the bloodstream after acute intake of 500 mL
L L Teixeira et al.
Food & function, 8(6), 2266-2274 (2017-05-26)
The bioavailability and metabolism of anthocyanins and ellagitannins following acute intake of grumixama fruit, native Brazilian cherry, by humans, and its in vitro antiproliferative activity against breast cancer cells (MDA-MB-231) were investigated. A single dose of grumixama juice was administered
W Setyaningsih et al.
Journal of agricultural and food chemistry, 67(10), 3018-3027 (2019-02-15)
There are several phenolic compounds in rice grains providing benefits for human health. The concentration of phenolic compounds in rice is strongly affected by the polishing steps during rice production. A new sensitive ultraperformance liquid chromatography-ultraviolet-visible spectroscopy method with a
M R Jeffers et al.
Microbiology (Reading, England), 143 ( Pt 6), 1975-1981 (1997-06-01)
A methyltransferase enzyme catalysing the 3-O-methylation of isovanillic acid (3-hydroxy-4-methoxybenzoic acid) by S-adenosylmethionine (SAM) was identified in Phanerochaete chrysosporium and purified. Gel filtration indicated an M(r) of 71,000 and SDS-PAGE showed that the enzyme was composed of two subunits of
Marc Gitzinger et al.
Nucleic acids research, 40(5), e37-e37 (2011-12-22)
Trigger-inducible transcription-control devices that reversibly fine-tune transgene expression in response to molecular cues have significantly advanced the rational reprogramming of mammalian cells. When designed for use in future gene- and cell-based therapies the trigger molecules have to be carefully chosen
J U Kreft et al.
European journal of biochemistry, 226(3), 945-951 (1994-12-15)
The previously studied complete methyl transfer sequence of tetrahydrofolate-dependent O-demethylation catalyzed by Holophaga foetida strain TMBS4 extracts was separated into two steps using cobalamins as non-physiological substrates: electrochemically produced cob(I) alamin served as methyl acceptor for phenyl methyl ether demethylation
Jessica L di Gesso et al.
Molecular nutrition & food research, 59(6), 1143-1154 (2015-03-25)
Flavonoids are generally studied in vitro, in isolation, and as unmetabolized precursor structures. However, in the habitual diet, multiple flavonoids are consumed together and found present in the circulation as complex mixtures of metabolites. Using a unique study design, we
Zhenya Chen et al.
ACS synthetic biology, 6(9), 1784-1792 (2017-06-07)
Vanillyl alcohol is a phenolic alcohol and is used as a flavoring agent in foods and beverages. In this paper, we propose a novel artificial pathway for microbial production of vanillyl alcohol from simple carbon sources. The pathway extends from
Widiastuti Setyaningsih et al.
Food chemistry, 288, 221-227 (2019-03-25)
Fifteen phenolic compounds were determined in rice grains by ultrasound assisted extraction and ultra-performance liquid chromatography with photodiode array detection. Primarily, an UAE method has been developed and validated for the extraction of phenolics from rice grains. For the optimization
Amandeep K Sandhu et al.
Food & function, 9(1), 96-106 (2018-01-11)
Strawberries contain a wide array of nutrients and phytochemicals including polyphenols such as anthocyanins, proanthocyanidins and ellagitannins. These polyphenols are absorbed and metabolized to various phenolic metabolites/conjugates in the body, which may play a role in disease risk reduction. In
Chun-Mei Chen et al.
Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials, 34(9), 1368-1370 (2012-01-21)
To study the chemical constituents of Phryma leptostachya. The chemical constituents were isolated and purified by silica gel column, recrystallization and Pre-RP-HPLC and their structwes were elucidated by spectroscopic methods. Five compounds were obtained and identified as ursolic acid (1)
Preparation of oxygenated phenylacetic acids.
Weller DD, et al.
The Journal of Organic Chemistry, 49(11), 2061-2063 (1984)
E Malarczyk
Acta biochimica Polonica, 31(4), 383-395 (1984-01-01)
Nocardia sp. demethylates veratric acid to vanillic and isovanillic acids, and subsequently to protocatechuic acid. The accumulation of specific mRNA observed during incubation of Nocardia sp. cells with substrate, as well as the effect of inhibitors of transcription and translation
Jun-Hui Choi et al.
Scientific reports, 10(1), 21102-21102 (2020-12-05)
Previous studies have suggested that vinegar intake can help to reduce body fat and hyperglycemia. Therefore, this study aimed to evaluate the anti-obesity efficacy of vinegar fermented using Cudrania tricuspidata fruits (CTFV) and its main phenolic constituents and to analyze
Mohamed A Farag et al.
Chemistry & biodiversity, 12(6), 955-962 (2015-06-18)
Bacterial wilts of potato, tomato, pepper, and or eggplant caused by Ralstonia solanacearum are among the most serious plant diseases worldwide. In this study, the issue of developing bactericidal agents from natural sources against R. solanacearum derived from plant extracts
Xuhuiqun Zhang et al.
Food & function, 9(2), 806-818 (2018-01-19)
Red raspberry (Rubus idaeus L.) contains a variety of polyphenols including anthocyanins and ellagitannins. Red raspberry polyphenols absorbed in different forms (parent compounds, degradants or microbial metabolites) are subject to xenobiotic metabolism in the intestine, liver, and/or kidney, forming methylate
Zhuxing Tang et al.
Journal of pharmaceutical and biomedical analysis, 40(2), 484-489 (2005-09-17)
A method based on capillary electrophoresis with electrochemical detection has been developed for the separation and determination of isovanillic acid, gentisic acid, kaempferol, quercetin, caffeic acid and protocatechuic acid in Ilex Purpurea Hassk and its medicinal preparations for the first
Sanghyun Lee et al.
Scientific reports, 9(1), 8059-8059 (2019-05-31)
Catechol O-methyltransferase (COMT) is widely distributed in nature and installs a methyl group onto one of the vicinal hydroxyl groups of a catechol derivative. Enzymes belonging to this family require two cofactors for methyl transfer: S-adenosyl-l-methionine as a methyl donor
Tomas Strucko et al.
Scientific reports, 7, 41431-41431 (2017-01-31)
Over-expression of a gene by increasing its copy number is often desirable in the model yeast Saccharomyces cerevisiae. It may facilitate elucidation of enzyme functions, and in cell factory design it is used to increase production of proteins and metabolites.
M A Fernández et al.
Journal of ethnopharmacology, 53(1), 11-14 (1996-07-26)
The phenolic fractions of aerial part of Scrophularia frutescens and S. sambucifolia (Scrophulariaceae) showed a potent antibacterial activity. Ferulic, isovanillic, p-hydroxycinnamic, p-hydroxybenzoic, syringic, caffeic, gentisic and protocatechuic acids were isolated from S. frutescens and ferulic, p-coumaric, vanillic, p-hydroxibenzoic and syringic
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