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5 results on '"Handique, Jyotirekha G."'

2. Antioxidant activity of some phenolic aldehydes and their diimine derivatives: A DFT study.

Author

Borgohain, Romesh, Guha, Ankur Kanti, Pratihar, Sanjay, and Handique, Jyotirekha G.

Subjects
ANTIOXIDANTS, ALDEHYDES, IMINE derivatives, DENSITY functional theory, PHENOLS, CHARGE exchange, FREE radical scavengers
Abstract

Phenolic compounds are known as antioxidant and/or radical scavengers via H-atom transfer or single electron transfer pathway. Density functional theory (DFT) calculations have been performed on some phenolic aldehydes and some of their designed diimine derivatives with different spacer lengths. Both H-atom transfer and single electron transfer pathways have been investigated by calculating the phenolic O–H bond dissociation energy (BDE) and vertical ionization potentials (IP V ). Moreover, the polarity of the solvent medium has been included in calculating BDE and IP V . The radical scavenging activity of these derivatives has been compared with 1,1-diphenyl-2-picrylhydrazyl (DPPH ) free radical. [ABSTRACT FROM AUTHOR]

Published
2015
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3. Antioxidant Activities and Total Phenolic and Flavonoid Contents in Three Indigenous Medicinal Vegetables of North-east India

Author

Handique, Jyotirekha G., Boruah, Manas Pratim, and Kalita, Dipika

Abstract

Antioxidant activities of the n-hexane, ethyl acetate and methanol extracts of three indigenous leafy vegetables of North East India viz., Polygonum microcephallum, Oxalis corniculataand Portulaca oleraceaewere measured by spectroscopic methods using the 1, 1- diphenyl-2-picrylhydrazyl (DPPH•) radical assay and xanthine/xanthine oxidase assay. The total phenolic and total flavonoid contents of each extract were also measured to assess their effect on the antioxidant activity. It was observed that the methanol extracts of all the species showed the highest antioxidant activities and high values for total phenolic and flavonoid contents. A strong correlation between the antioxidant activities and the total phenolic content was observed for the three vegetables. It indicates that phenolics are one of the main components responsible for the antioxidant behavior of vegetables. HPLC analysis showed the presence of a number of identified phenolic compounds.

Published
2012
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5. ChemInform Abstract: Reduction of α,β Unsaturated Carbonyl Compounds by Ni2+—BH‐4.

Author

Handique, Jyotirekha G., Purkayashtha, Arup, and Baruah, Jubaraj B.

Abstract

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Published
2001
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