Horacio Dorigan Moya

• Abstract

  In this project, the decomposition reaction of potassium peroxymonosulfate (PMS) in basic medium containing cobalt(II)/EDTA will be used in the development and application of a chemiluminescent analytical method to determine the total content of oxidizable compounds in tea samples, herbal extracts medicinal products, wines, beers, fruit juices and drugs, samples not investigated with this…

  Study of the alkaline decomposition reaction of potassium peroxymonosulfate and 2,2'-azobis dichorhydrate (2-methylpropionamidine): analytical applications in tea, herbs, wines, beers fruit juices and drugs, AP.R

• Abstract

  A method for the determination of total reducing capacity (TRC) based on the reduction reaction of Cu(II) to Cu(I) by antioxidants in buffered solution (pH 7.0) containing the 4,4'-dicarboxy-2,2'-biquinoline acid (BCA) was developed. Absorbance values at 558 nm characteristic of the Cu(I)/BCA complexes formed were used to determine the TRC of aqueous extracts of twelve Brazilian plants. T…

  A Comprehensive Study of the Use of Cu(I)/4,4'-Dicarboxy-2,2'-biquinoline Complexes to Measure the Total Reducing Capacity: Application in Herbal Extracts., PUB.ART

• Abstract

  The aim of this project is the development of a spectrophotometric method for the quantification of the total antioxidant capacity of ophthalmic formulations based on the consumption of the MPPD*+ free radical (purple) which is originated from the oxidation of N-(4-methoxyphenyl)-1,4-phenylenediamine (MPPD, blue). Previous results revealed that the addition of eye drops in a solution cont…

  Quantification of antioxidant capacity of eyedrops and artificial tears based on the consumption of the MPPD*+free radical originated from the oxidation of n-(4-methoxyphenyl)-1,4-phenylenediamine, BP.IC

• Abstract

  N-(4-methoxyphenyl)-1,4-phenylenediamine, abbreviated MPPD, also known as Variamine Blue B, is a p-phenylenediamine used as visual indicator in the complexometric titration of Fe(III) with EDTA (pH 2.0).It has been observed the colorless MPPD can be oxidized to its respective free radical MPPD*+ (purple) in buffered acid medium (pH 4,0; acetate).In presence of reducing agents (e.g. ascorb…

  Development of a spectrophotometric method for quantification of antioxidant capacity based on the formation of free radical derived from n- (4-methoxyphenyl)-1,4-phenylene, BP.IC

• Abstract

  The aim of this project is the development of an alternative spectrophotometric method to quantify the antioxidant capacity of some Brazilian tropical fruits and medicinal plant extracts based on the reduction reaction of Fe(III) to Fe(II) in aqueous solution containing excess of 1, 10-phenanthroline (1,10-phen).Fruits and plant extracts are rich in antioxidant compounds and the addition …

  New spectrophotometric method for quantification of the antioxidant capacity of tropical fruits and medicinal plant extracts based on the formation of Fe(II)/1,10-phenanthroline complexes, BP.IC

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