scholarly journals Determination of Antioxidant Compounds and Antioxidant Activity of Six Table Grapes with Red Skin

2020 ◽  
Vol 145 ◽  
pp. 01004
Author(s):  
Yanqiu Shen ◽  
Xinyi Cheng ◽  
Hui Gu ◽  
Guihong Zhou ◽  
Hui Xia ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Rank Order ◽  
Basic Knowledge ◽  
Antioxidant Compounds ◽  
Chengdu Plain ◽  
Table Grapes ◽  
Total Anthocyanins ◽  
Total Flavonoids Content ◽  
Grape Cultivars

Red grapes are a better source of antioxidants. Although studies have reported the major antioxidant contents and activities of grape cultivars, but the literature lacks information on detailed antioxidant composition and capacities of grape cultivars grown with rain-shelter-cultivation in Chengdu plain, south of China. In the present study, the total phenolics content (TPC), total flavonoids content (TFC), total flavanols content (TFAC), total anthocyanins content (TMAC) and antioxidant activity (DPPH, ABTS and FRAP) were detected and the results will provide basic knowledge about antioxidants of six red skin grapes. The results indicated the content rank order as follow: seeds > skin > pulp. Furthermore, ‘Red Globe’, ‘Jintianmeizhi’ and ‘Hongbaladuo’ have more antioxidants than other cultivars. Our results will provide a basic theory basis for consumers and further utilization of antioxidants.

scholarly journals Analysis of Polyphenolic Content and Antioxidant Activity of Four Dark Skin Grapes

2020 ◽  
Vol 145 ◽  
pp. 01005
Author(s):  
Yanqiu Shen ◽  
Wanling Zhang ◽  
Xiaohan Wei ◽  
Guihong Zhou ◽  
Hui Xia ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Radical Scavenging ◽  
Chengdu Plain ◽  
Table Grapes ◽  
Polyphenolic Content ◽  
Total Anthocyanins ◽  
Total Flavonoids Content ◽  
Grape Skins ◽  
Phenolics Content ◽  
Radical Scavenging Ability

The polyphenolic of grape skins, pulps and seeds are potential source of natural antioxidant, which are receiving increased attention. In the present work, the total phenolics content (TPC), total flavonoids content (TFC), total flavanols content (TFAC), total anthocyanins content (TMAC) and antioxidant activity (DPPH, ABTS and FRAP) in different tissues of 4 table grapes cultivated in Chengdu plain, south of China, were investigated. In present study, expect TMAC was not be detected in seeds, and our results showed that seeds were the highest in polyphenolic content and antioxidant activity followed by skins, and then pulp. Besides, ‘Fenghou’ is richer in polyphenolic content than other three cultivars. Hence, ‘Fenghou’ extracts possesses higher free radical scavenging ability.

scholarly journals Pigments, Polyphenols and Antioxidant Activity of Leaf Extracts from Four Wild Rose Species Grown in Sicily

2018 ◽  
Vol 46 (2) ◽  
pp. 402-409 ◽  
Author(s):  
Francesca D'ANGIOLILLO ◽  
Michele Massimo MAMMANO ◽  
Giancarlo FASCELLA
Keyword(s):  
Antioxidant Activity ◽  
Morphological Characteristics ◽  
Natural Antioxidants ◽  
Total Flavonoids ◽  
Leaf Extracts ◽  
Methanolic Extracts ◽  
Dpph Method ◽  
Total Anthocyanins ◽  
Total Flavonoids Content ◽  
Promising Source

Leaf methanolic extracts of four wild Rose species (Rosa canina L., R. corymbifera Borkh., R. micrantha Borrer ex Sm and R. sempervirens L.) grown in Sicily were analysed in order to evaluate differences among indigenous roses which could be used such as source of bioactive compounds and natural antioxidants. Leaves were harvested during two different periods (June and October) and their morphological characteristics were described. Leaf content of chlorophylls, total anthocyanins, total flavonoids, total polyphenols (Folin-Ciocalteu method) and antioxidant activity (DPPH method) were determined. Results showed that the contents of chlorophylls and carotenoids were higher in leaves of all species harvested in June than in those harvested in October. On the contrary, total anthocyanins of R. micrantha and R. corymbifera leaves were higher in October. Total polyphenol content was higher in leaves of all species were harvested in October. No difference in total flavonoids content was recorded between the two harvest periods but only among the four species. Antioxidant activity was generally high in leaf extracts of all species in both periods and, particularly, in R. micrantha leaves harvested in June. These outcomes seem to support the assessment that leaves harvested from some Sicilian wild roses may be used as promising source of healthy compounds and that their content varies with the species and harvest period.

scholarly journals Optimization The Effect of Roasting Conditions by Central Composite Design (CCD) Method on The Antioxidant Compounds of Opuntia Ficus Indica Seeds From Morocco

2020 ◽  
Author(s):  
Chakir El Guezzane ◽  
Hamza El Moudden ◽  
Hicham Harhar ◽  
Abdelkader Zarrouk ◽  
Mohamed Tabyaoui
Keyword(s):  
Antioxidant Activity ◽  
Central Composite Design ◽  
Principal Component ◽  
Total Phenolic ◽  
Antioxidant Compounds ◽  
Opuntia Ficus Indica ◽  
Optimal Value ◽  
Total Flavonoids Content ◽  
The One ◽  
Central Composite

Abstract The effect of roasting conditions on antioxidant activity Opuntia Ficus Indica seeds from Morocco and their phenolic compounds were optimized by the Central Composite Design (CDD) method. The CCD was used to optimize the roasting conditions: temperature (X1: 60–200 °C) and roasting time (X2: 10–50 min). The best roasting conditions were used in order to optimize the optimal value of the response : TPC (Total Phenolic Content): X1: 200°C, X2: 50min with 104.86±1.94GAE/g extract predicted response, TFC (Total Flavonoids Content) : X1: 200 °C, X2: 50 min with 81.23±0.90 mg QE/g extract predicted responses, TTC (Total Condensed Tannins Content): X1: 128.9°C, X2: 34.92min with 6.12±0.95 mg QAE/g extract) predicted response. Moreover, the optimal potential antioxidant activity by ABTS assay and DPPH assay was found in extracts of Opuntia Ficus Indica seeds roasted: at a high temperature of the roasting. Furthermore, the positive significant correlations were determined by the principal component analysis (PCA) on the one hand, between the antioxidant capacity of the extracts and their antioxidants compounds (TPC and TFC), and on the other hand, between the two assays ABTS and DPPH. Consequently, the results of this work indicated that roasted Opuntia Ficus Indica seeds from Morocco can be considered as an essential ingredient for human foods.

scholarly journals Determination of Antioxidant Activity of Vitamin C by Voltammetric Methods

Proceedings ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 23 ◽  
Author(s):  
Klaudia Suliborska ◽  
Monika Baranowska ◽  
Agnieszka Bartoszek ◽  
Wojciech Chrzanowski ◽  
Jacek Namieśnik
Keyword(s):  
Antioxidant Activity ◽  
Vitamin C ◽  
Chemical Properties ◽  
Differential Pulse ◽  
Antioxidant Compounds ◽  
Redox Active ◽  
Physical And Chemical ◽  
Kinetics Of ◽  
Voltammetric Methods

Voltammetric methods—cyclic (CV) and differential pulse voltammetry (DPV) are considered the most appropriate way to evaluate antioxidant activity of redox active compounds. They provide information about both mechanism and kinetics of electrochemical oxidation of antioxidants as well as their physical and chemical properties such as the redox potential or the number of electrons transferred. These methods are helpful for understanding the mechanisms of oxidation or reduction processes of antioxidant compounds. This work presents the electrochemical properties of vitamin C obtained by both CV and DPV methods.

Determination of antioxidant activity and antioxidant compounds in wild edible mushrooms

2007 ◽  
Vol 20 (3-4) ◽  
pp. 337-345 ◽  
Author(s):  
Mahfuz Elmastas ◽  
Omer Isildak ◽  
Ibrahim Turkekul ◽  
Nuri Temur
Keyword(s):  
Antioxidant Activity ◽  
Edible Mushrooms ◽  
Antioxidant Compounds ◽  
Wild Edible Mushrooms

scholarly journals Pseudo-Univariate Calibration Based on NIR Spectroscopy in the Determination of Anthocyanins and Antioxidant Activity in Grape Juices

2021 ◽  
Author(s):  
Karla Beltrame ◽  
Thays Gonçalves ◽  
Paulo Março ◽  
Sandra Gomes ◽  
Makoto Matsushita ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Near Infrared ◽  
Correlation Coefficients ◽  
Nir Spectroscopy ◽  
Grape Juice ◽  
Calibration Models ◽  
Total Anthocyanins ◽  
Alternative Methodology ◽  
Grape Juices

This work shows an alternative methodology based on a portable near-infrared (NIR) spectroscopy coupled to independent components analysis (ICA) in a pseudo-univariate calibration way to determine total anthocyanins (TA) concentration and antioxidant activity (AA) in whole grape juice. To this, the scores proportions more related to TA and AA were plotted against TA and AA obtained by its respective references methodology to build pseudo-univariate calibration models with correlation coefficients of 0.9699 and 0.9814, respectively. From the results, it is possible the suggestion that NIR spectra coupled to ICA enable to overcome interferences using first-order data and work properly when there is enough selectivity for the analyte profile in the sample data.

scholarly journals Penentuan Total Fenolik, Uji Antioksidan, Dan Uji Antibakteri Pada Ekstrak Etanol Jantung Pisang Ambon (Musa acuminate Colla)

2021 ◽  
Vol 1 ◽  
pp. 1903-1914
Author(s):  
Ratna Tri Lestari ◽  
S Slamet ◽  
W Wirasti ◽  
Urmatul Waznah
Keyword(s):  
Antioxidant Activity ◽  
Ethanolic Extract ◽  
Ethanol Extract ◽  
Total Phenol ◽  
Antioxidant Compounds ◽  
Antimicrobial Function ◽  
High Antioxidant Activity ◽  
Banana Flower ◽  
Paper Disc

AbstractBanana plant is one type of plant that contains chemical compounds that can be used for treatment. One part of the plant that has not been fully utilized is the heart of the Ambon banana (Musa acuminate Colla). Banana flower is known to contain flavonoid compounds, phenols, alkaloids, tannins, saponins, and coumarins. One of the compounds belonging to the flavonoid group which generally includes natural antioxidant compounds and has an antimicrobial function is phenolic compounds. The purpose of this study was to determine the total phenols, to examine the activity of antioxidants, antibacterials, and the ethanol extract of Ambon banana flower (Musa acuminate Colla). Determination of total phenol using the GAE (Gallic Acid Equivalence) method, antioxidant analysis using the FRAP method, and the antibacterial activity test using the paper disc method. The total phenol yield obtained was 17.7291 ± 0.102 mg GAE/g extract, the results from the antioxidant test were obtained with an EC50 value of 0.0628 µmolFe2+/g sampel extract, which means that the ethanolic extract of Ambon banana flower has a high antioxidant activity value, and antibacterial results in the extract. with a medium average (5-10 mm). From the results of tests carried out, the ethanol extract of Ambon banana flower has antioxidant activity and has little antibacterial power.Keywords : Banana plants; Ambon banana flower; antioxidants; antibacterial; total phenol AbstrakTanaman pisang merupakan salah satu jenis tanaman yang mengandung senyawa kimia yang dapat digunakan untuk pengobatan. Salah satu bagian tanaman yang belum dimanfaatkan secara maksimal adalah jantung pisang ambon (Musa acuminate Colla). Jantung pisang diketahui mengandung senyawa flavonoid, fenol, alkaloid, tannin, saponin, dan kumarin. Salah satu senyawa yang termasuk golongan flavonoid yang umumnya termasuk senyawa antioksidan alami dan memiliki fungsi antimikroba yaitu senyawa fenolik. Tujuan dari penelitian ini yaitu penentuan total fenol, meneliti aktivitas antioksidan, antibakteri, dan pada ekstrak etanol jantung pisang ambon (Musa acuminate Colla). Penentuan total fenol menggunakan metode GAE (Equivalensi Asam Galat), analisis antioksidan menggunakan metode FRAP, dan uji aktivitas antibakteri menggunakan metode kertas cakram. Hasil total fenol yang diperoleh 17,7291 ± 0,102 mg GAE/g ekstrak, hasil dari uji antioksidan didapat dengan nilai EC50 pada ekstrak 0,0628 µmolFe2+/g sampel yang berarti ekstrak etanol jantung pisang ambon mempunyai nilai aktivitas antioksidan yang tinggi, dan hasil antibakteri pada ekstrak dengan rata-rata sedang (5-10 mm). Dari hasil pengujian yang dilakukan ekstrak etanol jantung pisang ambon mempunyai aktivitas antioksidan dan mempunyai sedikit daya antibakteri. Kata kunci : Tanaman pisang; jantung pisang ambon; antioksidan; antibakteri; total fenol.

Determination of antioxidant compounds and antioxidant activity in commercial oilseeds for food use

2007 ◽  
Vol 103 (4) ◽  
pp. 1494-1501 ◽  
Author(s):  
Carlo I.G. Tuberoso ◽  
Adam Kowalczyk ◽  
Erika Sarritzu ◽  
Paolo Cabras
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Compounds
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