Essential oils, kava pyrones and phenolic compounds from leaves and rhizomes of Alpinia zerumbet (Pers.) B.L. Burtt. &amp; R.M. Sm. and their antioxidant activity

Elzaawely, Abdelnaser A.; Xuan, Tran Dang; Tawata, Shinkichi

doi:10.1016/j.foodchem.2006.08.025

Cited by 116 publications

(102 citation statements)

References 30 publications

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“…DK and DDK were present in all six different parts of the plant but rhizomes had higher inhibitory activity against AGEs formation than the other parts [154]. А previous study also provided data about the antioxidant acitivities of DDK present in leaves and rhizomes of A. zerumbet [155]. Among the compounds isolated from Alpinia zerumbet rhizomes, DK had the strongest inhibitory activity against BSA glycation with IC50 value of 15.9 µM.…”

Section: Other Phenolic Compounds a Stilbene Glucoside -2354'-tetrmentioning

confidence: 80%

Plant-Derived Agents with Anti-Glycation Activity

Odjakova¹,

Popova²,

Sharif³

et al. 2012

Glycosylation

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Section: Other Phenolic Compounds a Stilbene Glucoside -2354'-tetrmentioning

confidence: 80%

Plant-Derived Agents with Anti-Glycation Activity

Odjakova¹,

Popova²,

Sharif³

et al. 2012

Glycosylation

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“…The radical scavenging activity was evaluated as described previously [15]. Two milliliters of the methanolic solution of the sample at (200, 400, 600, and 800 ppm) were mixed with 1 mL of 0.5 mM DPPH methanolic solution and 2 mL sodium acetate buffer (0.1 M, pH 5.5).…”

Section: Antioxidant Activity By Dpph Radical Scavenging Methodsmentioning

confidence: 99%

Phenolic Compounds and Antioxidant Activity of Rice Straw Extract

Elzaawely

Maswada

El-Sayed

et al. 2017

ILNS

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Abstract. Agricultural wastes cause a serious environmental problem in Egypt. Utilization of these wastes by an environmentally friendly way is a very important issue. The objective of this study was to utilize rice straw into high-value products. Antioxidant activity, total soluble phenols, and flavonoids were evaluated in ethyl acetate extract prepared from rice straw after alkaline hydrolysis. Total phenols were found to be 221.6 mg gallic acid equivalents (GAE), while total flavonoids were 4.9 mg rutin equivalents (RE). The extract exhibited strong antioxidant activity measured by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging method and its IC 50 value was 0.4 mg/ml. Furthermore, the ethyl acetate extract possessed high antioxidant activity assayed by β-carotene bleaching method and its value of lipid peroxidation inhibition (LPI) was 75.4%. It also exhibited high reducing power and its IC 50 value was equal to 0.06 mg/ml. HPLC analysis indicated that this extract contained seven phenolic acids including; protocatechuic, caffeic, syringic, p-coumaric, ferulic, rosmarinic and cinnamic, in addition to two flavonoids; qurecetin and kaempferol. Results indicated that ferulic and p-coumaric acids were the major soluble phenolic acids in rice straw, and their concentrations were 3.9 and 2.9 mg/g DW. It can be summarized that the strong antioxidant activity of ethyl acetate extract, prepared from rice straw, was highly correlated with its high level of phenolic compounds.

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“…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]. Antioxidant compounds are widely distributed in vegetables, fruits, herbs and many food sources [9][10][11]. Thus, natural antioxidants need to be explored in supporting human health.…”

Section: Introductionmentioning

confidence: 99%

Antioxidant Capacity and Phenolic Contents of Three <i>Quercus</i> 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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Essential oils, kava pyrones and phenolic compounds from leaves and rhizomes of Alpinia zerumbet (Pers.) B.L. Burtt. & R.M. Sm. and their antioxidant activity

Cited by 116 publications

References 30 publications

Plant-Derived Agents with Anti-Glycation Activity

Plant-Derived Agents with Anti-Glycation Activity

Phenolic Compounds and Antioxidant Activity of Rice Straw Extract

Antioxidant Capacity and Phenolic Contents of Three <i>Quercus</i> Species

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