نتایج جستجو برای: phenolic

تعداد نتایج: 24076  

Journal: :The Journal of organic chemistry 2003
Salvatore D Lepore Yuanjun He

A vast rate increase in the Mitsunobu reaction of phenols with alcohols where either or both are sterically hindered has been achieved by the use of high concentration combined with sonication.

2013
iaoyun Yang Jeffrey Kirsch Jeffrey Fergus Aleksandr Simonian

During the electrochemical analysis or disposal of most of phenolic compounds, insulated polymeric substrates are created and cover the electrode surface. This can cause the signal current to decay over time, which is called electrode fouling or electrode passivation. This paper describes a model based on the potential drop across the fouling layer that is helpful for deeper understanding of th...

2016
Fatma Pehlivan Karakas Gunce Sahin Cingoz Arzu Ucar Turker

BACKGROUND Exogenous pretreatment of oxidative stress on callus cultures of Bellis perennis L. (common daisy) induced catalase (CAT), superoxide dismutase (SOD), total phenolic, total flavonoid, total protein and selected commercial phenolic compounds production and accumulation. MATERIALS AND METHODS The callus culture obtained from B. perennis pedicel explants was incubated on Murashige and...

Journal: :Journal of the Japan Society of Colour Material 1991

2003
Donglin Zhang Yasunori Hamauzu

Different colored bell peppers (Capsicum annuum L.), green, red, and yellow were examined for their content of phenolic compounds, ascorbic acid and carotenoids as well as free radical scavenging activity using DPPH assay and antioxidant activity using ß-carotene/linoleic acid assay. Phenolic, ascorbic acid and carotenoid contents varied in different colored bell peppers. Green pepper had highe...

Journal: :Molecules 2015
Mirtha Navarro Hoyos Fernando Sánchez-Patán Renato Murillo Masis Pedro J Martín-Álvarez William Zamora Ramirez Maria J Monagas Begoña Bartolomé

The phenolic composition of extracts from Uncaria tomentosa L. from different regions of Costa Rica was studied using advanced analytical techniques such as UPLC/TQ-ESI-MS and (13)C-NMR. Samples from leaves, stems, bark and wood (n = 22) were subjected to extraction to obtain phenolic and alkaloid extracts, separately. Comparatively, higher values of total phenolic content were observed for lea...

2017
Hiba N. Rajha Nada El Darra Sally El Kantar Zeina Hobaika Nicolas Louka Richard G. Maroun

Grape harvest date is determined according to the technological and phenolic maturities. These parameters were calculated for different red grape (Vitis vinifera L.) varieties (Cabernet Sauvignon, Merlot, Syrah, Cabernet Franc) over four years (2008, 2009, 2010, and 2011) (642 samples). Titratable acidity and sugar content of the grapes were used to determine the technological maturity, whereas...

2016
Christian Carpéné Mounia Hasnaoui Balázs Balogh Peter Matyus Alfredo Fernández-Quintela Víctor Rodríguez Josep Mercader Maria P. Portillo

Resveratrol has been reported to inhibit monoamine oxidases (MAO). Many substrates or inhibitors of neuronal MAO interact also with other amine oxidases (AO) in peripheral organs, such as semicarbazide-sensitive AO (SSAO), known as primary amine oxidase, absent in neurones, but abundant in adipocytes. We asked whether phenolic compounds (resveratrol, pterostilbene, quercetin, and caffeic acid) ...

Journal: :Journal of chromatography. A 2000
A Escarpa M C González

We have designed a novel working strategy to optimize a unique chromatographic method consisting of diode array detection for the analysis of the most representative phenolic compounds from different food sources. The simultaneous inclusion of standard phenolic compounds, phenolic compounds isolated from food sources and representative real extracts as an ultimate test in analysis has allowed t...

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