Effects of extraction solvents on concentration and antioxidant activity of black and black mate tea polyphenols determined by ferrous tartrate and Folin–Ciocalteu methods

Türkmen, Necattin; Sarı, Ferda; Velioğlu, Sedat

doi:10.1016/j.foodchem.2005.08.034

Cited by 616 publications

(418 citation statements)

References 36 publications

(32 reference statements)

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“…Numerous examples of the application of the FolinCiocalteu assay to assess the AOC of natural products may be found in the literature (HUANG; OU; PRIOR, 2005;TURKMEN;SARI, 2006). In most cases, total phenols determined by the Folin-Ciocalteu method are correlated with the antioxidant capacities confirming the value of the Folin-Ciocalteu test.…”

Section: Determination Of the Antioxidant Activity By The Dpph Assaymentioning

confidence: 79%

A novel procedure to measure the antioxidant capacity of Yerba maté extracts

et al. 2012

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Yerba maté extracts have in vitro antioxidant capacity attributed to the presence of polyphenolic compounds, mainly chlorogenic acids and dicaffeoylquinic acid derivatives. DPPH is one of the most used assays to measure the antioxidant capacity of pure compounds and plant extracts. It is difficult to compare the results between studies because this assay is applied in too many different conditions by the different research groups. Thus, in order to assess the antioxidant capacity of yerba maté extracts, the following procedure is proposed: 100 µL of an aqueous dilution of the extracts is mixed in duplicate with 3.0 mL of a DPPH 'work solution in absolute methanol (100 µM.L-1), with an incubation time of 120 minutes in darkness at 37 ± 1 °C, and then absorbance is read at 517 nm against absolute methanol. The results should be expressed as ascorbic acid equivalents or Trolox equivalents in mass percentage (g% dm, dry matter) in order to facilitate comparisons. The AOC of the ethanolic extracts ranged between 12.8 and 23.1 g TE % dm and from 9.1 to 16.4 g AAE % dm. The AOC determined by the DPPH assay proposed in the present study can be related to the total polyphenolic content determined by the Folin-Ciocalteu assay.

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Section: Determination Of the Antioxidant Activity By The Dpph Assaymentioning

confidence: 79%

A novel procedure to measure the antioxidant capacity of Yerba maté extracts

et al. 2012

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“…O conteúdo de compostos fenólicos, flavonoides e atividade antioxidante estão relacionados com a capacidade de extração de componentes de acordo com o grau de polaridade do solvente e da relação entre soluto e o solvente, sendo que a ação antioxidante é maior em extratos obtidos com solventes mais polares (Turkmen et al, 2006;Carvalho Jr. et al, 2014;Settharaksa et al, 2014).…”

Section: Resultsunclassified

Avaliação da atividade antimicrobiana de extratos de Eugenia anomala e Psidium salutare (Myrtaceae) frente à Escherichia coli e Listeria monocytogenes

Simonetti

Ethur

Castro

et al. 2016

Rev. bras. plantas med.

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RESUMO:As doenças transmitidas por alimentos ocorrem principalmente devido à ingestão de alimentos contaminados por microrganismos patogênicos, dentre eles a Escherichia coli e Listeria monocytogenes. Uma das alternativas estudadas para minimizar a contaminação de alimentos é o emprego de plantas, ou seus extratos, como agentes antimicrobianos de origem natural em produtos alimentícios. Desta forma o objetivo do presente estudo é fornecer dados científicos a respeito de duas plantas nativas do RS ainda não estudadas, Eugenia anomala e Psidium salutare, visando potencial emprego como agente antimicrobiano natural em alimentos. Para tanto, avaliou-se a atividade antimicrobiana de extratos de E. anomala e P. salutare contra E. coli e L. monocytogenes através da determinação da concentração inibitória mínima (CIM) pelo método de microdiluição em caldo, a capacidade antioxidante dos extratos por meio do método de redução do radical DPPH e a citotoxicidade in vitro empregando células CHO-K1. Os resultados obtidos mostraram que os extratos de acetato de etila e etanólico de ambas as espécies possuem ação antioxidante muito alta, de 94,08% e 93,86%, respectivamente. Apenas o extrato hexânico de P. salutare apresentou ação antimicrobiana moderada (CIM = 312,5 µg/mL). Todos os extratos apresentaram ação citotóxica sendo que os maiores percentuais foram do extrato clorofórmico de E. anomala (77,05%) e hexânico de P. salutare (76,79%), na concentração de 100 µg/mL. Assim, o presente estudo demonstrou que as espécies vegetais estudadas apresentam potencial para emprego como agente antimicrobiano destes microrganismos.Palavras-chave: Concentração Inibitória Mínima, Citotoxicidade in vitro, Atividade Antioxidante.ABSTRACT: Evaluation of the antimicrobial activity of extracts of Eugenia anomala and Psidium salutare (Myrtaceae) against the Escherichia coli and Listeria monocytogenes. The foodborne diseases occur mainly due to the ingestion of food contaminated by pathogenic microorganisms, including Escherichia coli and Listeria monocytogenes. One of the alternatives studied to minimize contamination of food is the use of plants or their extracts as antimicrobial agents naturally occurring in food products. The objective of this study is to provide scientific data on two native plants of RS have not studied Eugenia anomala and Psidium salutare for a potential use as a natural antimicrobial agent in food. To this end, we evaluated the antimicrobial activity of extracts of E. anomala and P. salutare against E. coli and L. monocytogenes by determining the minimum inhibitory concentration (MIC) by the broth microdilution method, the antioxidant capacity of the extract for means DPPH radical reduction method and in vitro cytotoxicity using CHO-K1 cells. The results showed that the ethyl acetate and ethanolic extracts of both species have very high antioxidant activity, of 94.08% and 93.86%, respectively. Only the hexane extract of P. salutare showed a moderate antimicrobial activity (MIC = 312.5 mg/mL). Moreover, all extracts showed ...

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“…Antioxidant components and activity are highly dependent on extracting solvent and concentration of solvent (Turkmen et al, 2006), but they also vary within the samples. Many researchers have reported the relationship between phenolic content and antioxidant activity.…”

Section: Reducing Powermentioning

confidence: 99%

Chemical composition and antioxidant properties of ginger root (Zingiber officinale)

Adel¹,

Prakash²

2010

J. Med. Plants Res.

168

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The chemical composition and antioxidant activity (in aqueous and solvent extracts) of Ginger root (Zingiber officinale) were determined. The antioxidant components analysed were polyphenols, vitamin C, β carotene, flavonoids and tannins. Antioxidant assays such as free radical scavenging activity, reducing power and total antioxidant activity were carried out for ethanol, methanol, acetone, 80% methanol and 80% ethanolic extracts. Protein and fat of sample were 5.08 and 3.72 g/100 g respectively. Ash, minerals namely iron, calcium, phosphorous, zinc, copper, chromium and manganese) and vitamin C were 3.85 (g), 8.0 (mg), 88.4 (mg), 174 (mg), 0.92 (mg), 0.545 (mg), 70 (µg), 9.13 (mg) and 9.33 (mg) per 100 g of sample, respectively. Antioxidant components (polyphenols, flavonoids and total tannin) were higher in hot water (100°C) extract than other solvent extracts and 30°C water extract. Antioxidant activity by 3 different methods showed higher activity in solvent extract than water extract. Order of antioxidant activity by reducing power and free radical scavenging activity by DPPH was as follows, 80% methanolic > 80%ethanolic > methanolic > ethanolic > 30°C water >100°C water > acetonic extract.

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Effects of extraction solvents on concentration and antioxidant activity of black and black mate tea polyphenols determined by ferrous tartrate and Folin–Ciocalteu methods

Cited by 616 publications

References 36 publications

A novel procedure to measure the antioxidant capacity of Yerba maté extracts

A novel procedure to measure the antioxidant capacity of Yerba maté extracts

Avaliação da atividade antimicrobiana de extratos de Eugenia anomala e Psidium salutare (Myrtaceae) frente à Escherichia coli e Listeria monocytogenes

Chemical composition and antioxidant properties of ginger root (Zingiber officinale)

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