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catechol/ľuľok zemiakový
Odkaz sa uloží do schránky
Strana 1 od 30 výsledky
Studies on the respiration of the white potato; preliminary investigation of the endogenous respiration of potato slices and catechol oxidase activity.
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[Catechol inhibition by the activation of oxidative metabolism in potato tuber slices].
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Effect of catechol tannins isolated from a medicinal plant Chrysobalanus icaco on the infectivity of potato virus X.
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Electrochemical biosensor made with tyrosinase immobilized in a matrix of nanodiamonds and potato starch for detecting phenolic compounds.
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The envisaged ubiquitous sensing and biosensing for varied applications has motivated materials development toward low cost, biocompatible platforms. In this paper, we demonstrate that carbon nanodiamonds (NDs) can be combined with potato starch (PS) and be deposited on a glassy carbon electrode
A new insight into purification of polyphenol oxidase and inhibition effect of curcumin and quercetin on potato polyphenol oxidase.
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In the literature, the polyphenol oxidase (PPO) enzyme has been purified a many times via Sepharose 4B-l-tyrosine-p-aminobenzoic acid affinity column. In order to study PPO purification efficiency, 2-aminophenol and 4-aminophenol were applied as a spacer arm to CNBr-activated Sepharose 4B. The
New Method for Accurate Determination of Polyphenol Oxidase Activity Based on Reduction in SERS Intensity of Catechol.
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Rapid and accurate measurement of polyphenol oxidase (PPO) activity is important in the food industry as PPOs play a vital role in catalyzing enzymatic reactions. The aim of this study was to develop surface-enhanced Raman scattering (SERS) approach for accurate determination of PPO activity in
Purification, kinetic parameters, and isoforms of polyphenol oxidase from "Xushu 22" sweet potato skin
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We purified and compared the polyphenol oxidase (PPO) isoenzymes present in "Xushu 22," a sweet potato. A membrane-bound form (mPPO) and two soluble forms (sPPO1 and sPPO2) were identified and purified using ammonium sulphate precipitation, ion exchange chromatography, gel filtration chromatography,
Evaluation of structure and bioprotective activity of key high molecular weight acylated anthocyanin compounds isolated from the purple sweet potato (Ipomoea batatas L. cultivar Eshu No.8).
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In order to figure out the key acylated anthocyanin compounds accounting for the bioprotective activity of purple sweet potato (Ipomoea batatas L.), ODS packing column, semi-preparative HPLC method, activity evaluation assays, and ultra-high-performance liquid chromatography with quadrupole
Flow injection spectrophotometric determination of L-Dopa and carbidopa in pharmaceutical formulations using a crude extract of sweet potato root [Ipomoea batatas (L.) Lam.] as enzymatic source.
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A flow injection (FI) spectrophotometric method is proposed for the determination of L-dopa and carbidopa in pharmaceutical formulations. After selection of the extraction medium (e.g., buffer-to-tissue ratio, pH, buffer concentration, protective agents and/or stabilizers) and storage conditions,
Inhibition of the β-catenin/Tcf signaling by caffeoylquinic acids in sweet potato leaf through down regulation of the Tcf-4 transcription.
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Sweet potato leaves contain the highest levels of functional polyphenols. In this study the effects of the sweet potato leaf extract and its contents, such as mono (3, 4, and 5)-caffeoylquinic acid (CQA), di-CQA (4,5-diCQA, 3,5-diCQA, and 3,4-diCQA) and caffeic acid (CA), were evaluated on the
The role of various amino acids in enzymatic browning process in potato tubers, and identifying the browning products.
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The effects of five structurally variant amino acids, glycine, valine, methionine, phenylalanine and cysteine were examined as inhibitors and/or stimulators of fresh-cut potato browning. The first four amino acids showed conflict effects; high concentrations (⩾ 100mM for glycine and ⩾ 1.0M for the
Crystal structure of a plant catechol oxidase containing a dicopper center.
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Catechol oxidases are ubiquitous plant enzymes containing a dinuclear copper center. In the wound-response mechanism of the plant they catalyze the oxidation of a broad range of ortho-diphenols to the corresponding o-quinones coupled with the reduction of oxygen to water. The crystal structures of
Carot-4-en-9,10-diol, a conidiation-inducing sesquiterpene diol produced by Trichoderma virens PS1-7 upon exposure to chemical stress from highly active iron chelators.
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To screen biocontrol agents against Burkholderia plantarii, the causative agent of rice seedling blight, we employed catechol, an analog of the virulence factor tropolone, to obtain chemical stress-resistant microorganisms. The fungal isolate PS1-7, identified as a strain of Trichoderma virens,
Antigenotoxicity of Enzymatic Browning Reaction Products of Potatoes in the Micronucleus Test.
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This study investigated the antigenotoxic effects of enzymatic browning reaction products (PEBRPs) obtained by reaction of polyphenol compounds with oxidase extracted from potato. Each of the PEBRPs by themselves at 100 mg/kg did not induce an increased frequency of micronucleated polychromatic
Development of Low-Cost Paper-Based Biosensor of Polyphenol Oxidase for Detection of Phenolic Contaminants in Water and Clinical Samples
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In the present work, polyphenol oxidase (PPO) enzyme was purified from potato peel using three-phase partitioning (TPP). In this method, ammonium sulfate and t-butanol were added to precipitate the protein/enzyme from the crude aqueous extract. The PPO enzyme precipitated as an interfacial layer
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