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Study of interaction between metal ions and quercetin

Food Science and Human Wellness 2018年第3期7卷 215-219页

作者： Taiane Souza de Castilho Tatiane Brescovites Matias Keller Paulo nicolini jaqueline nicolini Instituto Federal do Parana-IFPR Lacoppi-Laboratorio de Corantes e Processos PiroliticosDepartamento de QuimicaPalmasPRBrazil

A displacement test based on the interaction between the flavonoid quercetin and an excess of metal chloride allows the determination of the binding constant for the reaction between quercetin and Ca2+,Mg^2+and Ni^2+.The values obtained were 2.20±1.77×10^3 for Ca^2+,1.37±0.59×10^3 for Mg^2+and 7.03±1.04×10^4 for Ni^2+,and all interactions showed type 1:1 stoichiometry,as determined by titration and by the method of continuous variations(Job’s method).The complexion effect was observed qualitatively through a colorimetric change in the medium(yellow→neon yellow)and spectroscopically through a bathochromic shift in the absorption band of quercetin in the presence of *** investigation serves as a tool for the development and testing of materials capable of capturing toxic metal ions or favoring the absorption of beneficial ions(in relation to the human metabolism)through the construction of efficient bioorganic *** results reported herein allow understanding of this detection system,indicating the following ascending order of the binding constants(Mg^2+

关键词： Binding constants Quercetin Antioxidant properties

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Use of ultrasound to modify the pyrolyzed biomass of Pinus *** the implications for biological models

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Information Processing in Agriculture 2018年第2期5卷 199-204页

作者： Aislan R.Guimaraes Marcelo E.Cordeiro jaqueline nicolini Keller P.nicolini Chemistry Department Federal Institute of ParanaCampus PalmasPR CEP 85555-000Brazil

Pine(Pinus ssp.)needle biomass(PNB)was pyrolyzed at 400℃ for 3 h and then subjected to hydrothermal treatment at the same temperature for 10 min,with and without the addition of potassium chloride(KCl).The suspensions of the materials treated hydrothermally were submitted to ultrasound for 5,10,20,30 and 60 *** reflectance UV-Vis(DRUV)spectroscopy results for the materials with variations in sonication times were obtained and the band gap energy(E)was calculated.A culture medium containing Saccharomyces cerevisiae was monitored during 30 min of exposure to different materials for the calculation of the 10%(IC10),30%(IC30)and 50%(IC50)inhibitory *** the samples that underwent ultrasonic treatment,the material pyrolyzed at 400℃ without the addition of potassium ions(PNB4003H60)presented the greatest inhibition of 10% of the Saccharomyces cerevisiae *** the materials without the addition of potassium,the material pyrolyzed and sonicated for 10 min(PNB4003H10)showed the best characteristics for use as a support for Saccharomyces cerevisiae organisms.

关键词： Potassium Saccharomyces cerevisiae Spectroscopy

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