Comparative determination of phytochemicals and antioxidant activity from leaf and fruit of Sapindus mukorrossi Gaertn. – A valuable medicinal tree

Singh, R. B.; Kumari, Nishi

doi:10.1016/j.indcrop.2015.04.012

Cited by 50 publications

(30 citation statements)

References 30 publications

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“…The reducing power was assayed by using the method described previously [2] with some slight modifications. Two hundred microliters of each extract or BHT was mixed with 0.5 mL phosphate buffer 0.2 M (pH 6.6) and 0.5 mL potassium ferricyanide [K 3 Fe(CN) 6 ] (10 g/L) in a test tube.…”

Section: Reducing Powermentioning

confidence: 99%

“…In recent years, plant phenolic compounds have a great deal of attention because of multifunctional properties and beneficial effects on human health [1,2]. Phenolic including phenolic acids and flavonoids, which are characterized by at least one aromatic ring (C6) bearing one or more hydroxyl groups [3][4][5][6], are naturally synthesized via the shikimate pathway [7].…”

Section: Introductionmentioning

confidence: 99%

“…It has been estimated that there are over six thousand phenolic compositions identified and still a large percentage remains unexplored [4,8]. Phenolics are powerful antioxidants due to their beneficial properties to neutralize free radicals effectively by providing a hydrogen or an electron [2]. Antioxidants act as an inhibitor in the initiation of deleterious free radical reactions because they can inhibit or delay the oxidation of an oxidizable substrate in a chain reaction [8].…”

Section: Introductionmentioning

confidence: 99%

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Antioxidant Capacity and Phenolic Contents of Three Quercus Species

Tuyen

Khang

et al. 2016

ILNS

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ABSTRACT. The antioxidant capability and phenolic contents of ethanol extracts (free phenolics) and ethyl acetate extracts (bound phenolics) of three Quercus species were estimated in this work. The antioxidant activities were examined by 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2′-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) free radical, reducing power and -carotene bleaching methods. HPLC was employed to detect major phenolic acids. The leaf extract of Q. salicina contained maximum total phenolics while the highest total flavonoid content was found in the leaf extract of Q. serrata. The antioxidant activities varied among three species. Bark extract of Q. salicina was the most potential and it was closed to levels of the standard antioxidative dibutyl hydroxytoluene (BHT). The bark extract of Q. serrata also showed promising antioxidant activities despite their eminence was negligibly lower than Q. salicina. Stronger antioxidant activities of free phenolics than those of the bound phenolics may be attributed to higher quantities of free phenolics in the barks of Quercus species, however total flavonoids may not contribute a critical role. By HPLC analysis, thirteen phenolic acids were detected in the leaf and bark extracts. Of them, Q. salicina showed maximum in number (ten compounds) and quantities of detected phenolic acids. Ellagic, chlorogenic and benzoic acids were dominant in Quercus species. Findings of this study revealed that leaves and barks of three Quercus species are rich source of antioxidants, and Q. salicina is the most promising and should be elaborated to exploit its pharmaceutical properties.

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Section: Reducing Powermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Antioxidant Capacity and Phenolic Contents of Three Quercus Species

Tuyen

Khang

et al. 2016

ILNS

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“…The reducing power of different extracts was determined by using a method described previously [12] with some slight modifications. The reducing power was investigated by observing the transformation of Fe 3+ to Fe 2+ .…”

Section: Reducing Powermentioning

confidence: 99%

“…As a result, this process probably increases the possibility of common diseases [3][4][5][6][7]. Antioxidants are believed to play a central role in health care to prevent and scavenge radicals because they can alleviate chronic diseases and degenerate ailments such as cancer, autoimmune disorder, hypertension, atherosclerosis and ageing process [8][9][10][11][12][13][14]. In recent years, several plants have been studied for their antioxidant activity to develop natural antioxidant formulations for food, cosmetic, medicine and other purposes [15,16].…”

Section: Introductionmentioning

confidence: 99%

Phenolic Compounds and Antioxidant Activity of Castanopsis phuthoensis and Castanopsis grandicicatricata

Tuyen

Khang

Minh

et al. 2016

ILNS

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Abstract:In this study, total phenolic and flavonoid contents, antioxidant capacity, and phenolic compositions of Castanopsis phuthoensis and Castanopsis grandicicatricata (Fagaceae family) were investigated. It was found that bark extracts were rich of phenolic contents, whereas leaf extracts were abundant of flavonoids. The total phenolics varied from 11.20 to 35.47 mg gallic acid equivalent g -1 dry weight (DW), and the total flavonoids were from 2.24 to 12.55 mg rutin equivalent g -1 DW. The results of antioxidant activity evaluation showed that the DPPH (1,1-diphenyl-2-picryl-hydrazyl) radical scavenging activity of the free phenolic extracts were higher than the bound phenolic extracts. Regarding the reducing power and β-carotene bleaching assays, the free phenolic extracts showed remarkably strong antioxidant capacity that were similar to the levels of the standard BHT (dibutyl hydroxytoluene) did. It could be concluded that free phenolic extracts were more effective in antioxidant activities than bound phenolic extracts. Highly significant correlations were observed between phenolic contents and antioxidant activities (0.813 for DPPH and 0.841 for reducing power). By HPLC analysis, seven phenolic acids were detected including gallic, p-hydroxybenzoic, vanillic, sinapic, p-coumaric, ellagic acids, and vanillin. Of which, gallic, ellagic, and sinapic acids were the most abundant compounds in the two species. The results suggest C. phuthoensis and C. grandicicatricata contain rich sources of natural antioxidants and phenolic compounds which are probably considered in pharmaceutical use.

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