Antioxidant Activity and Kinetics Studies of Quercetin, Epicatechin and Naringenin in Bulk Methyl Linoleate

2017 ◽  
Vol 94 (9) ◽  
pp. 1189-1196
Author(s):  
Manuel Palma ◽  
Paz Robert ◽  
Francisca Holgado ◽  
Joaquín Velasco ◽  
Gloria Márquez-Ruiz
Keyword(s):  
Antioxidant Activity ◽  
Methyl Linoleate ◽  
Kinetics Studies

Mechanism and kinetics studies on the antioxidant activity of sinapinic acid

2011 ◽  
Vol 13 (23) ◽  
pp. 11199 ◽  
Author(s):  
Annia Galano ◽  
Misaela Francisco-Márquez ◽  
J. Raúl Alvarez-Idaboy
Keyword(s):  
Antioxidant Activity ◽  
Sinapinic Acid ◽  
Kinetics Studies ◽  
Mechanism And Kinetics

Antioxidant activity of casein and Maillard reaction products from casein-sugar mixtures

1991 ◽  
Vol 58 (3) ◽  
pp. 313-320 ◽  
Author(s):  
Barry J. McGookin ◽  
Mary-Ann Augustin
Keyword(s):  
Antioxidant Activity ◽  
Methyl Linoleate ◽  
Maillard Reaction ◽  
Model System ◽  
Sugar Concentration ◽  
Maillard Reaction Products ◽  
Reaction Products ◽  
Sugar Mixtures

SummaryThe antioxidant activity of casein and Maillard reaction products obtained by reaction of casein with glucose or lactose was studied. Antioxidant activity was evaluated in a model System containing methyl linoleate with haemoglobin as a pro-oxidant. Casein was antioxidative and heating casein in the presence of glucose or lactose resulted in enhancement of antioxidant activity. The development of antioxidant activity in reacted casein–sugar mixtures was determined as a function of initial casein and sugar concentration. The observed antioxidant activity of reacted casein–sugar mixtures was due to casein itself and Maillard reaction products resulting from reacting casein with sugar.

Chemical Composition and Antioxidant Activity of Juices from Mature and Immature Acerola (Malpighia emarginata DC)

2005 ◽  
Vol 11 (4) ◽  
pp. 315-321 ◽  
Author(s):  
A. M. Righetto ◽  
F. M. Netto ◽  
F. Carraro
Keyword(s):  
Antioxidant Activity ◽  
Ascorbic Acid ◽  
Chemical Composition ◽  
Phenolic Compounds ◽  
Methyl Linoleate ◽  
Vitamin C ◽  
Hplc Analysis ◽  
Syringic Acid ◽  
Coumaric Acid ◽  
Malpighia Emarginata

Chemical composition and antioxidant activity of juice from immature and mature acerola and of concentrated juice from immature acerola were determined. Tartaric, malic and citric acids and a high content of ascorbic acid were found in all the juices. Vitamin C contents were 4.80, 1.90 and 0.97 g/100 g for the concentrated immature, the immature, and the mature acerola juices respectively. The total phenol contents decreased during ripening, from 3.8 mg of catechin/g for immature acerola juice to 1.4 mg of catechin/g for mature acerola juice. The concentrated immature juice had a content of 9.2mg of catechin/g of juice. Catechin, gallic acid, coumaric acid, syringic acid, caffeic acid and ferrulic acid were detected in immature acerola juice by HPLC analysis whereas mature acerola juice showed only one predominant peak with a retention time similar to that of ferrulic acid. The concentrated juice from immature acerola reduced the oxidation of methyl linoleate by 57.2% while the juice from immature acerola reduced the oxidation by 28.1%. These results stated that the antioxidant potential of the acerola juice depended on its content of phenolic compounds and the vitamin C.

Antioxidant Activity and Partitioning of Phenolic Acids in Bulk and Emulsified Methyl Linoleate

1999 ◽  
Vol 47 (8) ◽  
pp. 3036-3043 ◽  
Author(s):  
Satu S. Pekkarinen ◽  
Heiko Stöckmann ◽  
Karin Schwarz ◽  
I. Marina Heinonen ◽  
Anu I. Hopia
Keyword(s):  
Antioxidant Activity ◽  
Methyl Linoleate ◽  
Phenolic Acids

Role of Tocopherol in the Reduction of Mitochondrial NAD

1974 ◽  
Vol 52 (8) ◽  
pp. 679-688 ◽  
Author(s):  
Frank B. Carabello
Keyword(s):  
Lipid Peroxidation ◽  
Antioxidant Activity ◽  
Energy Transfer ◽  
Methyl Linoleate ◽  
Phosphate Uptake ◽  
Coenzyme Q ◽  
Specific Requirement ◽  
Methyl Linoleate Hydroperoxide

Tocopherol deficiency had no effect on phosphate uptake linked to ascorbate–tetramethyl-p-phenylenediamine but did impair energy transfer associated with succinate-linked reduction of NAD. These results suggest that tocopherol deficiency uncouples site 1 but not site 3 related energy transfer.Marked differences were obtained with tocopherol deficiency and methyl linoleate hydroperoxide which showed that the effects of tocopherol deficiency on mitochondrial energy transfer could not be duplicated by in vitro addition of peroxides.Tocopherol administration via the portal vein, 45 min prior to extraction of tissue, reversed the effects of tocopherol deficiency. Intraportal diphenyl-p-phenylenediamine reversed lipid peroxidation but did not substitute for tocopherol in restoration of mitochondrial energy transfer. It was concluded that restoration of antioxidant activity does not assure restoration of energy transfer in tocopherol-deficient mitochondria.These results suggest that there is a specific requirement for tocopherol in succinate-linked reduction of NAD which would imply a cofactor function for tocopherol or a tocopherol-dependent metabolite. It was proposed that coenzyme Q could be a tocopherol-dependent metabolite which is required for energy transfer.

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