نتایج جستجو برای: o diphenols

تعداد نتایج: 554334  

Journal: :Plant physiology 2004
Michael L Sullivan Ronald D Hatfield Sharon L Thoma Deborah A Samac

Red clover (Trifolium pratense) leaves contain high levels of polyphenol oxidase (PPO) activity and o-diphenol substrates. Wounding of leaves during harvest and ensiling results in browning of leaf tissues from activity of PPO on the o-diphenols. In association with browning, leaf proteins remain undegraded during ensiling, presumably due to PPO-generated o-quinone inhibition of leaf proteases....

Journal: :Biochemical Society transactions 1975
R Davies W S Pierpoint

These indicate that in crabs adapted to 850 mosmolal condition, the glutamate, proline and glycine oxidation rates are similar in terms of pmol consumed per unit time, although the lower number of C atoms in glycine means that it enables only 40% as much ADP to be phosphorylated to ATP as the other two amino acids do. When the salinity is decreased, however, the contribution of glycine C to COz...

Journal: :Sustainability 2021

Phenol and its derivatives are hazardous, teratogenic mutagenic, have gained significant attention in recent years due to their high toxicity even at low concentrations. Phenolic compounds appear petroleum refinery wastewater from several sources, such as the neutralized spent caustic waste streams, tank water drain, desalter effluent production unit. Therefore, effective treatments of wastewat...

Journal: :Journal of oleo science 2014
Sonda Ammar Akram Zribi Amir Ben Mansour Mohamed Ayadi Ridha Abdelhedi Mohamed Bouaziz

The present work has been carried out to ascertain the influence of different processing systems employed in olive process on the chemical composition, quality and stability of three Chemlali olive oils. Among these oils, two were classified as extra-virgin olive oils and the third named repassed olive oil was classified as an ordinary virgin olive oil. The analysis of the effect of the process...

2014
Stephan Gerhard Mauracher Christian Molitor Rami Al-Oweini Ulrich Kortz Annette Rompel

Tyrosinase exhibits catalytic activity for the ortho-hydroxylation of monophenols to diphenols as well as their subsequent oxidation to quinones. Owing to polymerization of these quinones, brown-coloured high-molecular-weight compounds called melanins are generated. The latent precursor form of polyphenol oxidase 4, one of the six tyrosinase isoforms from Agaricus bisporus, was purified to homo...

2002
J. R. Babu A. E. Brink

A method has been developed for the synthesis of semicrystalline poly(arylene ether ether sulfide) materials by first preparing a soluble, amorphous sulfoxide containing precursor, then rapidly reducing the sulfoxide moiety to sulfide. The sulfoxide polymers are synthesized using conventional nucleophilic aromatic substitution reactions between difluorodiphenyl sulfoxide and diphenols. Reductio...

Journal: :The Journal of nutritional biochemistry 2003
Shela Gorinstein Olga Martin-Belloso Elena Katrich Antonin Lojek Milan Cíz Nuria Gligelmo-Miguel Ratiporn Haruenkit Yong-Seo Park Soon-Teck Jung Simon Trakhtenberg

The aim of this study was to compare the contents of the main biochemical compounds and the antioxidant capacity of five Spanish olive oils by four different antioxidant tests and to find out the most valuable oil for disease preventing diets. Fatty acids, sterols and individual antioxidant compounds in Arbequina, Hojiblanca, Extra Virgin, Picual and Lampante Spanish olive oils were determined....

Journal: :The Biochemical journal 1998
J C Espín P A García-Ruiz J Tudela F García-Cánovas

This paper reports experiments on the stereospecificity observed in the monophenolase and diphenolase activities of mushroom tyrosinase. Several enantiomorphs of monophenols and o-diphenols were assayed: L-tyrosine, D,L-tyrosine, D-tyrosine; L-alpha-methyltyrosine, D,L-alpha-methyltyrosine; L-dopa, D,L-dopa, D-dopa; L-alpha-methyldopa, D,L-alpha-methyldopa; L-isoprenaline, D,L-isoprenaline and ...

Journal: :Applied and environmental microbiology 2005
Diana Hernández-Romero Francisco Solano Antonio Sanchez-Amat

Sequencing of the genome of Ralstonia solanacearum revealed several genes that putatively code for polyphenol oxidases (PPOs). To study the actual expression of these genes, we looked for and detected all kinds of PPO activities, including laccase, cresolase, and catechol oxidase activities, in cellular extracts of this microorganism. The conditions for the PPO assays were optimized for the phe...

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