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determination of antioxidant activity in tea extracts

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

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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 Antioxidants Activity in Tea Extract

The antioxidant activity of water extracts from white, green and black tea was measured using three methods. 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 ...

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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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Determination of Antioxidant Activity in Tea Extracts, and ...

Antioxidant activity of different types of tea (green, oolong, black, pu-erh ) were measured using different modern methods. Several types of commercially available teas, from various manufacturers were tested for antioxidant content using the amperometric method, the data is displayed here. Data gathered about antioxidant content of these different tea samples can be used to estimate quality ...

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Antioxidant activity determination in Sencha and Gun ...

Antioxidant activity determination in Sencha and Gun Powder green tea extracts with the application of voltammetry and UV-VIS spectrophotometry. Author links open overlay panel Anna Masek a Ewa Chrzescijanska b Anna Kosmalska a Marian Zaborski a. Show more. Share.

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Determination of antioxidant activity and total phenol ...

Determination of antioxidant activity and total phenol contents of two Salvia extracts ... The most Salvia species are used as a traditional herbal tea in some Mediterranean countries. It has been collected from ... Antiradical activity values of extracts of S.fruticosa changed between 599.10 µg/m and 890.14 µg/ml.

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Determination of Phenolic and Antioxidant Properties in ...

Determination of Phenolic and Antioxidant Properties in Tea and ... antioxidant activity of tea extracts. Some studies on the extraction conditions of active antioxidant components from

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Phenol content and antioxidant activity of green, yellow ...

Determination of antioxidant activity of tea leaf extracts The antioxidant activity was determined using two methods, ABTS and DPPH methods. The ABTS assay followed the method of Arnao et al. [10] with some modifications. The results were expressed as μmol trolox equivalents (TE)/100 g of tea leaves (μmol TE/100 g).

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Determination of in vitro antioxidant activity of fennel ...

Total antioxidant activity of ethanol and water extracts of FS was determined by the thiocyanate method. Table 1 shows the extraction yields and gallic acid equivalents. In addition, Table 2 shows inhibition of lipid peroxidation in percent of water and ethanol extracts of FS, α-tocopherol, BHA and BHT.Ethanol and water extracts of FS exhibited effective antioxidant activity at all ...

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Determination of antioxidant activity in methanolic and ...

Determination of antioxidant activity in methanolic and chloroformic extracts of Momordica charantia Rezaeizadeh A1, ABZ Zuki2*, Abdollahi M2, YM Goh2, MM Noordin3, M Hamid4 and TI Azmi1,2 1Institute of Bioscience, University Putra Malaysia, 43400 UPM, Serdang, Selangor.

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Determination of Antioxidant Activity in Tea Extracts, and ...

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 Phenolic and Antioxidant Properties in ...

Determination of Phenolic and Antioxidant Properties in Tea and ... antioxidant activity of tea extracts. Some studies on the extraction conditions of active antioxidant components from

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Determination of Phenolics and Antioxidant Properties in ...

Determination of Phenolics and Antioxidant Properties in Tea and the Effects of Polyphenols on Alpha-Amylase Activity: N.I. Nadiah, L.H. Cheng, M.E. Azhar, A.A. Karim, U. Uthumporn and A.S. Ruri: Abstract: Total phenolic content (TPC), total flavonoid content (TFC) and antioxidant activity on different type of tea (green, black and oolong) which were extracted by using three types of solution ...

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Green Extraction of Antioxidant Polyphenols from Green Tea ...

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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A comparative study of the antioxidant scavenging activity ...

Comparisons of the antioxidant activity of green and black teas have been described in the past and shown green tea to exhibit greater antioxidant activity (Von Gadow, Joubert, & Hansmann, 1997). Coffea arabica (arabica) has been suggested to contribute up to 64% of total antioxidant intake in the human diet ( Svilaas et al., 2004 ), but its ...

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Determination of in-vitro phenolics, antioxidant capacity ...

Determination of in-vitro phenolics, antioxidant capacity and bio-accessibility of Kombucha tea produced from black carrot varieties grown in Turkey Elif YILDIZ1* , Metin GULDAS2, Ozan GURBUZ1 a Received 09 Jan., 2020 Accepted 01 Mar., 2020

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Validated HPTLC and antioxidant activities for quality ...

2.8 Determination of antioxidant activities. Miang extracts were investigated for antioxidant activities by the following assays. 2.8.1 2,20-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) assay. Miang extracts were tested for free radical scavenging activities by ABTS assay.

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Estimation of Total Phenols and Flavonoids in Extracts of ...

A significant antioxidant activity, i.e., mean inhibition of DPPH radical was observed in methanol extract and ethyl acetate fraction at the concentration of 10 μg/ml and 5 μg/ml respectively (Table 2). A slight increase in antioxidant activity was observed in methanol extract as well as ethyl acetate fraction in concentration dependent manner.

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In vitro antioxidant activity of phenolic-enriched ...

2.5 Determination of antioxidant activity The DPPH scavenging activity, ABTS scav-enging capacity, and ferric-reducing antioxidant power (FRAP) assays were used to evaluate the an-tioxidant activity of the extracts. The DPPH assay was determined by the method of Mohsen and Am-mar (2009). The ABTS assay was carried out ac-

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(PDF) Antioxidant activity and phenolic content of fresh ...

Antioxidant activity of nuts as compared with those positive correlation between these parameters (r2 = 0.70) (Fig. 3). of tea samples The correlation found in this study between antioxidant activity and phenolic content was lower than that between the same To better evaluate their contribution to human diet, total parameters in different ...

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Determination of antioxidant activity and total phenol ...

Determination of antioxidant activity and total phenol contents of two Salvia extracts ... The most Salvia species are used as a traditional herbal tea in some Mediterranean countries. It has been collected from ... Antiradical activity values of extracts of S.fruticosa changed between 599.10 µg/m and 890.14 µg/ml.

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Antioxidant Activity of Various Tea Extracts in Relation ...

The yields of crude tea extracts for green tea, pouchong tea, oolong tea, and black tea were 3.96, 4.14, 5.11, and 3.89 g, respectively. Antioxidant Activity. The antioxidant activity of tea extracts was determined according to the thiocyanate method (Mitsuda et al., 1966). Each sample (500 pg) in 0.5 mL of

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Determination of Phenolics and Antioxidant Properties in ...

Determination of Phenolics and Antioxidant Properties in Tea and the Effects of Polyphenols on Alpha-Amylase Activity: N.I. Nadiah, L.H. Cheng, M.E. Azhar, A.A. Karim, U. Uthumporn and A.S. Ruri: Abstract: Total phenolic content (TPC), total flavonoid content (TFC) and antioxidant activity on different type of tea (green, black and oolong) which were extracted by using three types of solution ...

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Antioxidant activity and determination of bioactive ...

Antioxidant activity and determination of bioactive compounds by ... Also a tea spoon of root powder is given every night as blood purifier (Pullaiah, 2006). ... values of DPPH radical scavenging activity of Methanol extracts of three species of Atalantia compared with the standard (Vitamin C).

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ANTIOXIDANT POTENTIAL AND RADICAL SCAVENGING ACTIVITY OF ...

correlations between polyphenol content in processed tea leaves extracts and its antiradical and antioxidant activity. Evaluations were carried on leaves differentiated by the fermentation process degree -white, green, yellow, red and black tea, with use of DPPH, ABTS, FRAP, reducing power and chelating activity evaluation methods.

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Determination of antioxidant activity in methanolic and ...

Determination of antioxidant activity in methanolic and chloroformic extracts of Momordica charantia Rezaeizadeh A1, ABZ Zuki2*, Abdollahi M2, YM Goh2, MM Noordin3, M Hamid4 and TI Azmi1,2 1Institute of Bioscience, University Putra Malaysia, 43400 UPM, Serdang, Selangor.

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Determination of Antioxidant Activities of Different ...

Methods of the determination of antioxidant activity, radical scavenging and total phenolic content The antioxidant activity of the extracts were determined with β-carotene-linoleic acid system [22]. The β-carotene solution was prepared by dissolving 2 mg of β-carotene in 10 mL of chloroform. 40 mg of linoleic

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Determination of antioxidant activity of different ...

of discoloration indicates the scavenging potential of the antioxidant compounds or extracts in terms of hydrogen donating ability (Oktay et al., 2003). RESULTS AND DISCUSSION species and its total antioxidant capacity is given in Table 1. Total antioxidant capacity of Emblica officinalis is expressed as the number of equivalents of ascorbic acid.

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Determination of Antioxidant Activity in Different ...

The antioxidant activity by the method of NO revealed sequestration of nitric oxide by the ethanolic extracts of methanol and 11.62% of 6.9% and is not verified activity in other extracts. Other studies were done to verify the antioxidant potential, including the method scavenger of superoxide free radical and

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Determination of Antioxidant Activity in Garlic ( Allium ...

Determination of Antioxidant Activity in Garlic (Allium sativum) Extracts Subjected to Boiling Process in vitroCunbao Liu 1, Xu Yang 1, Yufeng Yao 1, Weiwei Huang 1, Wenjia Sun 1, Yanbing Ma 1,. 1 Department of Molecular Immunology, Institute of Medical Biology, Chinese Academy of Medical Science and Peking Union Medical College, Kunming, China

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