determination of antioxidants activity in tea extract

determination of antioxidants activity in tea extract

Determination of Antioxidants Activity in Tea Extract

The highest antioxidant activity was found to be related to white tea. Hot water extracts of green and normal black tea showed also statistically significant antioxidant activities (P < 0.05). There was no statistically significant difference between the antioxidant activities of black tea and tea wastes, i.e. barks and old leaves discarded in

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determination of antioxidant activity in tea extracts, and

Determination of Antioxidant Activity in Tea Extracts, and

Keywords: Tea, antioxidant activity, amperometric method, antioxidants, tea polyphenols. 1. Introduction In the last decade, determination of antioxidant activity and the total content of antioxidants in foods, beverages, dietary supplements and herbal extracts has been in wide demand. This relates to the fact that antioxidants

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determination of antioxidant activity in tea extracts, and

Determination of Antioxidant Activity in Tea Extracts, and

The best results for antioxidant activity estimated by DPPH and phosphomolybdenum methods were achieved in biscuits enriched with black tea powder (3%): 2.25 and of 32.64 mg TEAC·g ⁻¹

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[pdf] determination of antioxidant activity in tea extracts

[PDF] Determination of Antioxidant Activity in Tea Extracts

DOI: 10.5099/AJ110400322 Corpus ID: 87969792. Determination of Antioxidant Activity in Tea Extracts, and Their Total Antioxidant Content @article{Yashin2011DeterminationOA, title={Determination of Antioxidant Activity in Tea Extracts, and Their Total Antioxidant Content}, author={Alexander Y. Yashin and Y. Yashin and B. Nemzer}, journal={American Journal of Biomedical Sciences}, year={2011

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determination of tea components with antioxidant activity

Determination of Tea Components with Antioxidant Activity

Determination of Tea Components with Antioxidant Activity CARMEN CABRERA,* RAFAEL GIMEÄNEZ, AND M. CARMEN LOÄ PEZ Department of Nutrition and Bromatology, School of Pharmacy, University of Granada, Campus de Cartuja, E-18012 Granada, Spain Levels of essential elements with antioxidant activity, as well as catechins, gallic acid, and caffeine

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measurement of antioxidant activity - sciencedirect

Measurement of antioxidant activity - ScienceDirect

Sireerat and Schulte (2012) determined the antioxidant activity of tea infusions, fruit juices and vegetable extracts using an automated amperometric DPPH assay, in which antioxidant capacity measurements were achieved using DPPH radical as an amperometric redox indicator, with a pencil Pb working electrode, in conjunction with a Pt counter

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[pdf] determination of antioxidant activity in tea extracts

[PDF] Determination of Antioxidant Activity in Tea Extracts

DOI: 10.5099/AJ110400322 Corpus ID: 87969792. Determination of Antioxidant Activity in Tea Extracts, and Their Total Antioxidant Content @article{Yashin2011DeterminationOA, title={Determination of Antioxidant Activity in Tea Extracts, and Their Total Antioxidant Content}, author={Alexander Y. Yashin and Y. Yashin and B. Nemzer}, journal={American Journal of Biomedical Sciences}, year={2011

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determination of tea components with antioxidant activity

Determination of Tea Components with Antioxidant Activity

Determination of Tea Components with Antioxidant Activity CARMEN CABRERA,* RAFAEL GIMEÄNEZ, AND M. CARMEN LOÄ PEZ Department of Nutrition and Bromatology, School of Pharmacy, University of Granada, Campus de Cartuja, E-18012 Granada, Spain Levels of essential elements with antioxidant activity, as well as catechins, gallic acid, and caffeine

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determination of antioxidant properties of dry rose tea

Determination of Antioxidant Properties of Dry Rose Tea

2.4. Determination of Total Antioxidant Substance by ABTS Method TEAC (trolox equivalent antioxidant capacity) method was used to determine the antioxidant activity of the rose samples. This method has become an effective factor in selecting the method in the study conducted because it is easier, practical and faster than other antioxidant

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comparison of the antioxidant activity of pickled tea

Comparison of the Antioxidant Activity of Pickled Tea

The picked Assam tea was extracted with water, 50% ethanol-water and ethanol and the suitable solvent was selected and determined for optimized extraction time. 2.5. Evaluation of antioxidant activity of the tea extracts 2.5.1 DPPH radical scavenging activity The antioxidant activity of the extracts was determined in term of

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determination and comparison of phenolic compound content and

Determination and comparison of phenolic compound content and

In practice, several in vitro test procedures are carried out for evaluating antioxidant activities with the samples of interest. The ability of phenolic extracts to reduce Fe 3 + to Fe 2 + in this assay serves as a significant reflection of the antioxidant activity (Oktay et al., 2003).

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green extraction of antioxidant polyphenols from green tea

Green Extraction of Antioxidant Polyphenols from Green Tea

For antioxidant activity, UAE-DES also produced higher FRAP, DPPH, and ABTS values than UAE-ethanol, ethanol, and hot water extraction, which may be related to the higher content of polyphenols in the tea extract obtained by UAE-DES, consistent with previous studies that demonstrated that polyphenols were the main contributors to antioxidant

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preparative isolation, quantification and antioxidant

Preparative isolation, quantification and antioxidant

About 6.4mg of phloridzin, 48.4mg of trilobatin, and 4.7mg of phloretin with purities of 96.7%, 98.4% and 98.1% were obtained from 130mg of the crude Sweet Tea extract. Phloridzin, trilobatin, and phloretin had effective radical scavenging activities, with IC50 values of 866.80, 20.16 and 179.47μg/mL, respectively, in a 1,1-diphenyl-2

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comparison of the antioxidant activity of pickled tea

Comparison of the Antioxidant Activity of Pickled Tea

The picked Assam tea was extracted with water, 50% ethanol-water and ethanol and the suitable solvent was selected and determined for optimized extraction time. 2.5. Evaluation of antioxidant activity of the tea extracts 2.5.1 DPPH radical scavenging activity The antioxidant activity of the extracts was determined in term of

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antioxidants | free full-text | antioxidant activity of

Antioxidants | Free Full-Text | Antioxidant Activity of

This tea’s preventive activity is attributed mainly to the antioxidant properties of its polyphenolic content . Although there have been several studies on tea’s polyphenols, there is a need for ongoing research, since there are many tea varieties cultivated in various regions having different soil and climatic conditions which affect tea

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evaluation of the antifungal and antioxidant activities of

Evaluation of the Antifungal and Antioxidant Activities of

lower the EC50 value, the higher is the antioxidant activity of the tested sample. EC50 values of A. vera extract, tea extract and ascorbic acid are indicated in Table II. Ascorbic acid was used as standard and tea extract was used as the positive control. The EC50 values were 11.49 μgml-1 and 13.36 μg ml-1.

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green extraction of antioxidant polyphenols from green tea

Green Extraction of Antioxidant Polyphenols from Green Tea

2.6. Determination of Antioxidant Activity The antioxidant activity of green tea extracts was determined using ferric-reducing antioxidant power (FRAP) assay, DPPH free radical scavenging assay, and ABTS free radical scavenging assay as described with some modifications by Tang et al. [29] and Yang et al. [30]. All experiments were

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total phenolic contents and antioxidant activities of

Total Phenolic Contents and Antioxidant Activities of

with water extract. Ferric reducing antioxidant assay ± results are closed each other and the highest activity (0.27 0.74 mM Trolox) was observed in the ethanol extract of ST. Antioxidant activities and TPC of the herbal tea samples varied depending on the extraction solvent. Water or aqueous organic solvent extracts of sage tea and green

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