scholarly journals Determination of Total Polyphenols and Antioxidant Activity of Leaf and Bark Extracts of Combretumglutinosum

2017 ◽  
Vol 6 (7) ◽  
pp. 1075-1079
Keyword(s):  
Antioxidant Activity ◽  
Total Polyphenols

The rapid determination of total polyphenols content and antioxidant activity in Dendrobium officinale using near-infrared spectroscopy

2016 ◽  
Vol 8 (23) ◽  
pp. 4584-4589 ◽  
Author(s):  
Longhui Ma ◽  
Zhimin Zhang ◽  
Xingbing Zhao ◽  
Sufeng Zhang ◽  
Hongmei Lu
Keyword(s):  
Antioxidant Activity ◽  
Infrared Spectroscopy ◽  
Near Infrared ◽  
Rapid Determination ◽  
Nir Spectroscopy ◽  
Dendrobium Officinale ◽  
Chemometric Methods ◽  
Total Polyphenols ◽  
Rapid Quantification

NIR spectroscopy coupled with chemometric methods for rapid quantification of total polyphenols content and antioxidant activity inDendrobium officinale.

scholarly journals THE INFLUENCE OF CLIMATIC CONDITIONS ON OENOLOGICAL PARAMETERS OF SOME WINE CULTIVARS FROM DIFFERENT ROMANIANVINEYEARD

2020 ◽  
Vol 1 (1) ◽  
pp. 103-110
Author(s):  
PetronelaAnca Onache ◽  
Dorin Ioan Sumedrea ◽  
Alina Florea ◽  
Andrei Tănase
Keyword(s):  
Antioxidant Activity ◽  
Statistical Analysis ◽  
Climatic Conditions ◽  
Pinot Noir ◽  
Chemical Parameters ◽  
Total Polyphenols ◽  
Sauvignon Blanc

A study concerning the influence of climatic conditions on the oenological parameters of wine cultivars was carried out using six wine cultivars under the climatic conditions of 2019. Wine samples were taken from Ştefăneşti–Argeş, Babadag and Drăgăşani viticultural centres. Determination of the oenological parameters has been made for the following wine cultivars: Riesling Italian, Fetească Regală, Sauvignon Blanc, Feteascǎ Neagră, Merlot and Pinot Noir. The chemical parameters were determined using a Mindray BS 200 oenological analyser and the statistical analysis of the results was carried out using the Duncan test. A correlation was made between the parameters of the six wine cultivars from the three viticultural centres, focusing on the correlations between the total polyphenols of wines and their antioxidant activity.

Contribution of Major Polyphenols to the Antioxidant Profile and Cytotoxic Activity of Olive Leaves

2019 ◽  
Vol 19 (13) ◽  
pp. 1651-1657
Author(s):  
Zouhaier Bouallagui ◽  
Asma Mahmoudi ◽  
Amina Maalej ◽  
Fatma Hadrich ◽  
Hiroko Isoda ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Hepg2 Cells ◽  
Cytotoxic Activities ◽  
Phenolic Composition ◽  
Olive Leaves ◽  
Total Polyphenols ◽  
Cytotoxic Effects ◽  
Antioxidant Profile ◽  
Phytochemical Profile ◽  
Mcf 7

Aim: This study was designed to investigate the phytochemical profile and the cytotoxic activities of the eco-friendly extracts of olive leaves from Chemlali cultivar. Materials and Methods: The Phenolic composition of olive leaves extracts, the antioxidant activity and the cytotoxic effects against MCF-7 and HepG2 cells were determined. Results: Olive leaves extracts showed relevant total polyphenols contents. Oleuropein was the major detected phenolic compound reaching a concentration of 16.9 mg/ml. The antioxidant potential of the studied extracts varied from 23.7 to 46.5mM Trolox equivalents as revealed by DPPH and ABTS assays. Cytotoxicity experiments showed similar trends for both HepG2 and MCF-7 cells with the infusion extract being the most active. Conclusion: This study denotes that olive leaves may have great potential as endless bioresource of valuable bioactive compounds which may have a wide application.

scholarly journals Comparative Assessment of the Basic Chemical Composition and Antioxidant Activity of Stevia rebaudiana Bertoni Dried Leaves, Grown in Poland, Paraguay and Brazil—Preliminary Results

2021 ◽  
Vol 11 (8) ◽  
pp. 3634
Author(s):  
Teresa Leszczyńska ◽  
Barbara Piekło ◽  
Aneta Kopeć ◽  
Benno F. Zimmermann
Keyword(s):  
Antioxidant Activity ◽  
Chemical Composition ◽  
Vitamin C ◽  
Dietary Fiber ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Stevia Rebaudiana ◽  
Steviol Glycosides ◽  
Total Polyphenols ◽  
Stevia Rebaudiana Bertoni

This study compares the content of basic nutrients (proteins, fats, digestible carbohydrates, dietary fiber and ash), steviol glycosides, selected antioxidants (vitamin C, total polyphenols) and antioxidant activity in dried leaves of Stevia rebaudiana Bertoni cultivated in Poland, Paraguay and Brazil and available in the direct sale. The basic chemical composition was determined by standard AOAC (Association of Official Analytical Chemists) methods. Content of steviol glycosides was determined by the UHPLC-UV chromatographic method. Total polyphenols content was expressed as gallic acid equivalent (GAE) and catechins equivalent (CE). Antioxidant activity was measured as ABTS●+ free radical scavenging activity. Dried leaves of S. rebaudiana grown in Poland had significantly higher contents of dietary fiber, and lower protein and ash content, compared to those derived from Paraguay and Brazil. The former had, however, considerably higher contents of total steviol glycosides, stevioside and rebaudioside D, compared to the remaining two plants. In the Paraguay-derived dried leaves, the content of rebaudioside A, C, E and rubusoside was found to be significantly lower. Dried leaves of S. rebaudiana Bertoni, cultivated in Poland, contained substantially more vitamin C and a similar content of total polyphenols, compared to those from Brazil and Paraguay. The examined material from Brazil and Paraguay plantations showed similar antioxidant activity, while that obtained from Polish cultivation was characterized by a significantly lower value of this parameter.

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