Phenol
Mostrando 1-12 de 1495 artigos, teses e dissertações.
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1. Ethanol and aqueous extracts characterization from guava (Psidium guajava L.) and avocado (Persea americana Mill.) residues
Abstract In Mexico, avocado and guava production generate agronomic residues that contain bioactive compounds as secondary metabolites produced in plants. Their consumption offer favourable health effects; therefore, the objective of the present research was to characterize the bioactive compounds and antioxidant properties in guava (Psidium guajava L.) and
Food Sci. Technol. Publicado em: 2021-09
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2. Physicochemical, sensory properties and in-vitro bioaccessibility of phenolics and antioxidant capacity of traditional noodles enriched with carob (Ceratonia siliqua L.) flour
Abstract In this study, the use of carob flour (CF) was investigated to improve the nutritional, antioxidative, and sensory properties of the noodles produced by the traditional method. In traditional noodle production, carob flour was used as a substitute to wheat flour at six different ratios (0% -control: Cmilk, Cwater, 10-40%, CF; w/w). In the noodle sam
Food Sci. Technol. Publicado em: 2021-09
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3. A Comparison of the Photolytic and Photocatalytic Degradation of Triclosan: Identification of Transformation Products and Ecotoxicity Evaluation
Triclosan (5-chloro-2-(2,4-dichlorophenoxy)phenol) is commonly used as an antibacterial agent in various industrial products and is often detected in wastewater effluent. Comparison was made for triclosan degradation by photolysis and TiO2 photocatalysis (under UV irradiation (125 W)) based on analysis of transformation products, together with ecotoxicity ev
J. Braz. Chem. Soc.. Publicado em: 2021-08
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4. A Theoretical Antioxidant Mechanism for Cytoprotective Effect of p-Acetamide-Salicylate Derivatives against Free Radical Initiator AAPH in Human Erythrocytes
The molecular mechanism of cytoprotective effect on human erythrocytes of aminophenol and salicylates associated derivatives was related to their antioxidant capacity. The oxidative hemolysis induced by water-soluble free-radical initiator 2,2’-azobis-(2-amidine-propane)-dihydrochloride (AAPH) was inhibited by drug candidates named benzaminophen (BZL), sal
J. Braz. Chem. Soc.. Publicado em: 2021-07
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5. Electrochemical Preparation and Evaluation of Cytotoxic Activity of Methoxyl-oxo-biseugenol, a New Oxidized Derivative of Biseugenol
Electrochemical procedures have emerged as a powerful tool for the synthesis of complex organic molecules including transformation of natural products. In this study, the electrosynthesis of biseugenol in MeOH afforded one new oxidized derivative, which was characterized as methoxyl-oxo-biseugenol (MOB) by nuclear magnetic resonance (NMR) and electrospray io
J. Braz. Chem. Soc.. Publicado em: 2021-05
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6. Comparison of phenolics, antioxidant capacity and total phenol bioaccessibility of Ribes spp. grown in Turkey
Abstract In this study, anthocyanins (13), flavanols (6), phenolic acids (10), flavonol glycosides (17), antioxidant capacity, and bioaccessible phenolic content of Ribes spp., grown in Turkey were investigated. Individual phenolic compounds were identified and quantified with LC-QTOF/MS in red and black currants and hybrid Jostaberry. Significant variations
Food Sci. Technol. Publicado em: 2020-12
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7. A Highly Selective Fluorescent Chemosensor for Al3+ Based on 2,2’:6’,2”-Terpyridine with a Salicylal Schiff Base
Two 2,2’:6’,2”-terpyridine-based Schiff bases (TPySSB and TPySB) have been synthesized. The TPySSB shows remarkable selective ‘off-on’ fluorescence for Al3+ in combination with photoinduced electron transfer (PET) mechanism and C=N isomerization mechanism. Chemosensor TPySSB binds Al3+ in a 1:2 ratio with an association constant 6.8 × 105 (correla
J. Braz. Chem. Soc.. Publicado em: 2020-09
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8. Effect of heat treatment for liquefaction and pasteurization on antioxidant activity and phenolic compounds of Astragalus and sunflower-cornflower honeys
Abstract In this study, effect of heat treatments (liquefaction at 55 °C for 12 h and pasteurisation at 90 °C 15 sec) on total phenolic content, antioxidant activity and phenolic compounds of astragalus and sunflower-cornflower honeys was investigated. Total phenol content and antioxidant activity of honeys were assessed by Folin-Ciocalteu and ABTS methods
Food Sci. Technol. Publicado em: 2020-09
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9. Zn treatment effects on biological potential of fennel bulbs as affected by in vitro digestion process
Abstract Zn treatment effects on the stability of polyphenols, MDA (malondialdehyde) content, antioxidant and lipoxygenase inhibition activities of two varieties of fennel bulbs were studied by using an in vitro gastrointestinal digestion model. Likewise, the effect of Zn on viability cells of E. coli was also performed. The results revealed that high amount
Food Sci. Technol. Publicado em: 2020-06
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10. Optimization of the extraction of phenolic compounds from olive pomace using response surface methodology
ABSTRACT Extraction of olive oil gives rise to large quantities of pomace and liquid effluents, since on average only 21% of the weight of the olive corresponds to oil, the remaining 79% consists of water, bark, pulp and stone. With the intention to make available new forms of use of this residue, this research was proposed, with aimed to optimize the extrac
Rev. Ceres. Publicado em: 2020-06
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11. Pyrolysis of the Caupi Bean Pod (Vigna unguiculata): Characterization of Biomass and Bio-Oil
The use of agricultural residues for the production of bio-oil is an important alternative to the use of fossil fuels. In this study, the Caupi bean pod (Vigna unguiculata) was characterized and used as biomass in the production of bio-oil. This biomass was evaluated in terms of physicochemical, morphological (scanning electron microscopy (SEM)), and thermal
J. Braz. Chem. Soc.. Publicado em: 2020-06
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12. A QUÍMICA DOS SANEANTES EM TEMPOS DE COVID-19: VOCÊ SABE COMO ISSO FUNCIONA?
In December 2019, the first case of severe acute respiratory syndrome (COVID-19), caused by the new coronavirus (SARS-CoV-2) was reported and the disease was declared as a worldwide pandemic in March 2020. As there is no vaccine currently available, the daily hygiene cleaning habits and social distance are the ways to fight COVID-19 indicated by the WHO. Han
Quím. Nova. Publicado em: 2020-05