Phytochemical Composition and Antioxidant Capacity of 30 Chinese Teas

Tea has been reported to prevent and manage many chronic diseases, such as cancer, diabetes, obesity, and cardiovascular diseases, and the antioxidant capacity of tea may be responsible for these health benefits. In this study, the antioxidant capacities of fat-soluble, water-soluble, and bound-insoluble fractions of 30 Chinese teas belonging to six categories, namely green, black, oolong, dark, white, and yellow teas, were systematically evaluated, applying ferric-reducing antioxidant power and Trolox equivalent antioxidant capacity assays. In addition, total phenolic contents of teas were determined by Folin–Ciocalteu method, and the contents of 18 main phytochemical compounds in teas were measured by high-performance liquid chromatography (HPLC). The results found that several teas possessed very strong antioxidant capacity, and caffeine, theaflavine, gallic acid, chlorogenic acid, ellagic acid, and kaempferol-3-O-glucoside, as well as eight catechins, were the main antioxidant compounds in them. Thus, these teas could be good natural sources of dietary antioxidants, and their extracts might be developed as food additives, nutraceuticals, cosmetics, and pharmaceuticals.

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Determination of Flavonoid and Proanthocyanidin Profile of Hungarian Sour Cherry

Molecules ◽

10.3390/molecules23123278 ◽

2018 ◽

Vol 23 (12) ◽

pp. 3278 ◽

Cited By ~ 10

Author(s):

Andrea Nemes ◽

Erzsébet Szőllősi ◽

László Stündl ◽

Attila Biró ◽

Judit Homoki ◽

...

Keyword(s):

Antioxidant Capacity ◽

Radical Scavenging Activity ◽

Radical Scavenging ◽

Sour Cherry ◽

Fresh Fruit ◽

Water Soluble ◽

Trolox Equivalent Antioxidant Capacity ◽

Total Phenolic ◽

Antioxidant Power ◽

Trolox Equivalent

Hungarian sour cherries (SC) are excellent source of anthocyanin (concentrations (100–300 mg in 100 g fresh fruit) and melatonin (0.15 mg in 100 g fresh fruit), but other flavonoid derivatives also can be isolated by aqueous alcoholic extraction. We have developed a new process for extracting non-extractable procyanidines bound to the membrane, proteins, and fibers. These compounds were seperated with UHPLC-MS methods, and the structure of individual components were identified on the basis of their mass fragmentation spectra. The antioxidant capacity of soluble and non-soluble antioxidants were measured with ferric reducing antioxidant power (FRAP), 1,1-diphenyl-2-picrylhydrazyl radical scavenging activity (DPPH), trolox equivalent antioxidant capacity (TEAC) assays, and compared to the new measurement methods of water-soluble antioxidant capacity (ACW), lipid-soluble antioxidant capacity (ACL). Furthermore, total phenolic content (TPC) and total procyanidin content (PAC) were determinated. As a result of our investigation, we found that the solvent combination, where in the first step is water–ethanol (1:1), then 100% ethanol were suitable for the extraction of the extractable antioxidants. However, the chemiluminescence method that is based on the elimination of the superoxide radical is more accurate than other colorimetric methods which measure antioxidant capacity.

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Fermentation with Tea Residues Enhances Antioxidant Activities and Polyphenol Contents in Kombucha Beverages

Antioxidants ◽

10.3390/antiox11010155 ◽

2022 ◽

Vol 11 (1) ◽

pp. 155

Author(s):

Dan-Dan Zhou ◽

Adila Saimaiti ◽

Min Luo ◽

Si-Yu Huang ◽

Ruo-Gu Xiong ◽

...

Keyword(s):

Green Tea ◽

High Performance ◽

Antioxidant Activities ◽

Black Tea ◽

Trolox Equivalent Antioxidant Capacity ◽

Total Phenolic ◽

Array Detector ◽

Antioxidant Power ◽

Phenolic Contents ◽

Trolox Equivalent

Kombucha is a popular beverage with various bioactivities (such as antioxidant activity), which can be attributed to its abundant bioactive compounds, especially polyphenols. Kombucha is conventionally prepared by fermentation of a sugared black tea infusion without tea residue. In this study, the effects of black tea residue and green tea residue on kombucha were studied, and its antioxidant activities, total phenolic contents, as well as concentrations of polyphenols at different fermentation stages were evaluated using ferric-reducing antioxidant power, Trolox equivalent antioxidant capacity, Folin-Ciocalteu method and high-performance liquid chromatography with a photodiode array detector. The results showed that fermentation with tea residue could markedly increase antioxidant activities (maximum 3.25 times) as well as polyphenolic concentrations (5.68 times) of kombucha. In addition, green tea residue showed a stronger effect than black tea residue. Overall, it is interesting to find that fermentation with tea residues could be a better strategy to produce polyphenol-rich kombucha beverages.

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Potential of Grape Wastes as a Natural Source of Bioactive Compounds

Molecules ◽

10.3390/molecules23102598 ◽

2018 ◽

Vol 23 (10) ◽

pp. 2598 ◽

Cited By ~ 18

Author(s):

Guo-Yi Tang ◽

Cai-Ning Zhao ◽

Qing Liu ◽

Xiao-Ling Feng ◽

Xiao-Yu Xu ◽

...

Keyword(s):

Bioactive Compounds ◽

Antioxidant Activities ◽

Food Additives ◽

Water Soluble ◽

Trolox Equivalent Antioxidant Capacity ◽

Total Phenolic ◽

Antioxidant Power ◽

Phenolic Contents ◽

Antioxidant Capacities ◽

Phenolic Profiles

Grapes are widely used in the wine and juice industries, which can lead to massive amounts of waste, mostly grape peels and seeds. The antioxidant capacities, total phenolic and flavonoid contents and phenolic profiles of peels and seeds from 30 grape varieties were systemically assessed. The antioxidant activities of fat-soluble, water-soluble and insoluble-bound fractions of grape peels and seeds were evaluated using ferric-reducing antioxidant power and Trolox equivalent antioxidant capacity assays, and their total phenolic contents and total flavonoid contents were determined by the Folin-Ciocalteu method and AlCl3 colorimetry, respectively. It was found that the antioxidant capacities were diverse among different grape peels and seeds. Moreover, several phenolic compounds were identified and quantified, including gallic acid, cyanidin-3-glucoside, epicatechin, catechin gallate, ferulaic acid, rutin and resveratrol, which could contribute to the antioxidant capacities of these grape peels and seeds. Several grape wastes with strong antioxidant activity could be abundant sources of natural bioactive compounds, and have the potential for development into functional foods, food additives and pharmaceuticals.

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Phenolic Profiles and Antioxidant Activities of 30 Tea Infusions from Green, Black, Oolong, White, Yellow and Dark Teas

Antioxidants ◽

10.3390/antiox8070215 ◽

2019 ◽

Vol 8 (7) ◽

pp. 215 ◽

Cited By ~ 18

Author(s):

Cai-Ning Zhao ◽

Guo-Yi Tang ◽

Shi-Yu Cao ◽

Xiao-Yu Xu ◽

Ren-You Gan ◽

...

Keyword(s):

Antioxidant Activities ◽

Dry Weight ◽

Trolox Equivalent Antioxidant Capacity ◽

Total Phenolic ◽

Antioxidant Power ◽

Phenolic Contents ◽

Tea Infusions ◽

Phenolic Profiles ◽

Trolox Equivalent ◽

Ferric Reducing Antioxidant Power

Tea is among the most consumed drink worldwide, and its strong antioxidant activity is considered as the main contributor to several health benefits, such as cardiovascular protection and anticancer effect. In this study, the antioxidant activities of 30 tea infusions, which were obtained by the mimic of drinking tea of the public, from green, black, oolong, white, yellow and dark teas, were evaluated using ferric-reducing antioxidant power (FRAP) and Trolox equivalent antioxidant capacity (TEAC) assays, ranging from 504.80 ± 17.44 to 4647.47 ± 57.87 µmol Fe2+/g dry weight (DW) and 166.29 ± 24.48 to 2532.41 ± 50.18 µmol Trolox/g DW, respectively. Moreover, their total phenolic contents (TPC) were detected by Folin-Ciocalteu assay and were in the range of 24.77 ± 2.02 to 252.65 ± 4.74 mg gallic acid equivalent (GAE)/g DW. Generally, Dianqing Tea, Lushan Yunwu Tea, and Xihu Longjing Tea showed the strongest antioxidant activities among 30 teas. Furthermore, the phenolic compounds in tea infusions were identified and quantified, with catechins most commonly detected, especially in green tea infusions, which were main contributors to their antioxidant activities. Besides tea polyphenols, considerable content of caffeine also presented in 30 tea infusions.

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Quality Parameters of Juice Obtained from Hydroponically Grown Tomato Processed with High Hydrostatic Pressure or Heat Pasteurization

International Journal of Food Science ◽

10.1155/2020/4350461 ◽

2020 ◽

Vol 2020 ◽

pp. 1-12

Author(s):

Maja Jeż ◽

Wioletta Błaszczak ◽

Kamila Penkacik ◽

Ryszard Amarowicz

Keyword(s):

Hydrostatic Pressure ◽

Antioxidant Capacity ◽

High Hydrostatic Pressure ◽

Storage Period ◽

Quality Parameters ◽

Trolox Equivalent Antioxidant Capacity ◽

Total Phenolic ◽

Microbial Count ◽

Antioxidant Power ◽

Trolox Equivalent

The effect of processing such as high hydrostatic pressure (HHP) (400-600 MPa/15 min) or low pasteurization temperature (LPT) (74°C/2 min) or high pasteurization temperature (HPT) (90°C/1 min) on selected quality parameters of juice obtained from hydroponically cultivated beef tomatoes was investigated. The total polyphenols content (TPC), total phenolic index (TPI), Trolox equivalent antioxidant capacity (ABTS) and ferric reducing antioxidant power (FRAP) were analysed in the fresh and processed juices stored for 0, 7 and 14 days. What is more, colour parameters (L∗,a∗,b∗,∆E), the activity of polyphenol oxidase (PPO) and peroxidase (POD) and microbial stability were also analyzed following the juices storage. Among all the tested samples, the juice exposed to 600 MPa for 15 min showed superior quality. Samples treated with 600 MPa for 15 min and stored for 0, 7 and 14 days had high TPC, TPI, ABTS, FRAP and a∗ values. As demonstrated, these tested samples at the end of the storage period retained 90% and 95% of their polyphenol content and antioxidant capacity, respectively. As in the case of pasteurization, juice processing at 600 MPa for 15 min clearly reduced the activity of food-spoiling enzymes (PPO, POD) as well as the microbial count. The obtained results showed that TPC was significantly and positively correlated with TPI, ABTS and FRAP parameters.

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Comparison of total phenolic contents and antioxidant capacities in mint genotypes used as spices / Baharat olarak kullanılan nane genotiplerinin toplam fenolik içerikleri ve antioksidan kapasitelerinin karşılaştırılması

Turkish Journal of Biochemistry ◽

10.1515/tjb-2015-0034 ◽

2015 ◽

Vol 40 (6) ◽

Cited By ~ 2

Author(s):

Mahfuz Elmastaş ◽

İsa Telci ◽

Hüseyin Akşit ◽

Ramazan Erenler

Keyword(s):

Antioxidant Capacity ◽

Total Phenolic Content ◽

Phenolic Content ◽

Dry Weight ◽

Trolox Equivalent Antioxidant Capacity ◽

Total Phenolic ◽

Herbal Tea ◽

Antioxidant Power ◽

Phenolic Contents ◽

Antioxidant Agents

AbstractObjective: Mint (Mentha spp.) genotypes used as spices are cultivated in Turkey and used for different purposes including herbal tea, spices, the cosmetics industry, and are used in folk medicine. While mint species have been used in traditional practices during humanity’s long history, there is limited research on the comparison of their antioxidant capacity and phenolic contents. This aim of the research is to compare antioxidant capacity and phenolic contents in mint clones to determine superior genotypes for herbal and spice usage and cultivation.Methods: Antioxidant capacity was evaluated by ferric reducing antioxidant power (FRAP) and trolox equivalent antioxidant capacity (TEAC). Total phenolic content in clones were determined by Folin-Ciocalteu method.Results: Maximum total phenolic content [28.27±3.95 μg gallic acid equivalent (GAE)/g dry weight (DW)] and FRAP activity 577.09±46.02 μmol Trolox equiv/g DW were obtained from Clone 13 (M. spicata), while M. piperita clones were higher for TEAC activity (800.02±1.10 μmol Trolox equiv/g DW). The results were first records for M. villoso nervata. FRAP and TEAC activities selected clones were correlated with total phenolic content (r=0.77; 0.73 respectively).Conclusion: According to the results, it can be suggested that Clone 13, Clone 5, (M. spicata) Clone 3 and Clone 8 (M. piperita) are more suitable for use as spice, herbal tea, and antioxidant agents. The clones must be selected for commercial cultivation by the grower and they can be used as spices and herbal teas.

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Antioxidant Potential of Grass Pea Seeds from European Countries

Foods ◽

10.3390/foods7090142 ◽

2018 ◽

Vol 7 (9) ◽

pp. 142 ◽

Cited By ~ 7

Author(s):

Wojciech Rybiński ◽

Magdalena Karamać ◽

Katarzyna Sulewska ◽

Andreas Börner ◽

Ryszard Amarowicz

Keyword(s):

Phenolic Compounds ◽

Total Phenolics ◽

Trolox Equivalent Antioxidant Capacity ◽

Total Phenolic ◽

Grass Pea ◽

Antioxidant Power ◽

Phenolic Contents ◽

Trolox Equivalent ◽

Ferric Reducing Antioxidant Power ◽

Derivatives Of

Phenolic compounds were extracted from seeds of 30 varieties of grass pea (Lathyrus sativus) into 80% (v/v) methanol. The total phenolics compounds content of the extracts and their antioxidant activity were determined using Folin-Ciocalteu’s phenol reagent and 2,2′-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) and ferric-reducing antioxidant power (FRAP) methods, respectively. Total phenolic contents ranged from 1.88 to 7.12 mg/g extract and 20.3 to 70.3 mg/100 g seeds. The extracts and seeds were characterized using Trolox equivalent antioxidant capacity values of 0.015–0.037 mmol Trolox/g extract and 0.158–0.372 mmol Trolox/100 g seeds, and FRAP values of 0.045–0.120 mmol Fe2+/g extract and 0.487–1.189 Fe2+/100 g seeds. The total phenolics content of grass pea extract was correlated with the results of the ABTS (r = 0.881) and FRAP (r = 0.781) assays. The same correlation was observed between the results of both assays (r = 0.842). Two derivatives of p-coumaric acid were the dominant phenolic compounds of the Derek cultivar of grass pea.

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Serbian aromatized wine “Bermet”: Electrochemical, chemiluminescent and spectrophotometric determination of antioxidant activity

Journal of the Serbian Chemical Society ◽

10.2298/jsc190404139g ◽

2020 ◽

Vol 85 (4) ◽

pp. 517-529

Author(s):

Stanislava Gorjanovic ◽

Ferenc Pastor ◽

Sofia Loupassaki ◽

Mile Veljovic ◽

Predrag Vukosavljevic ◽

...

Keyword(s):

Antioxidant Capacity ◽

Integrated Approach ◽

Trolox Equivalent Antioxidant Capacity ◽

Total Phenolic ◽

Equal Weight ◽

Antioxidant Power ◽

15Th Century ◽

Traditional Procedure ◽

Trolox Equivalent ◽

Ferric Reducing Antioxidant Power

Serbian aromatized wine ?Bermet? from grapes grown on Fruska Gora Mountain has been in production since the 15th century. Ten commercial Bermets produced according to the traditional procedure by different manufacturers, and six prepared within the scope of this study were assessed for antioxidant (AO) activity using electrochemical, chemiluminescent and spectrophotometric AO assays. Direct current polarographic assay based on the decrease of anodic current of [hydrogen(peroxido)(1-)]hydroxidomercury(II) complex formation in alkaline H2O2 solution at potential of mercury oxidation, chemiluminescent H2O2 scavenging assay, as well as commonly used spectrophotometric assays (2,2?-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) based Trolox equivalent antioxidant capacity (TEAC), 2,2-diphenyl-1- picrylhydrazyl (DPPH) and ferric reducing antioxidant power (FRAP)) were used. Total phenolic content (TPC) was determined by Folin?Ciocalteu assay. The results obtained were correlated using regression analysis, ANOVA and F-test. An integrated approach to AO capacity determination allowed a more comprehensive comparison between samples. The approach is based on the introduction of the relative antioxidant capacity index, calculated by assigning each AO assay equal weight, and by PCA analysis. In addition, the introduction of phenolic antioxidant coefficients, calculated as the ratio between individual AO capacity and TPC, enabled a better understanding of their relation.

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Biowaste as a Potential Source of Bioactive Compounds—A Case Study of Raspberry Fruit Pomace

Foods ◽

10.3390/foods10040706 ◽

2021 ◽

Vol 10 (4) ◽

pp. 706

Author(s):

Slađana Krivokapić ◽

Milorad Vlaović ◽

Biljana Damjanović Vratnica ◽

Andrej Perović ◽

Svetlana Perović

Keyword(s):

High Performance ◽

Rubus Idaeus ◽

Total Phenolic ◽

Antioxidant Compounds ◽

Ultrasound Assisted Extraction ◽

Antioxidant Power ◽

Chromatography Analysis ◽

Potential Source ◽

Trolox Equivalent ◽

Fruit Pomace

Raspberry fruit pomace, a byproduct of juice production, was studied as a potential source of antioxidant compounds. Target high-performance liquid chromatography analysis of important polyphenolic compounds (gallic, p-coumaric, caffeic, quercitrin, chlorogenic, and ellagic acid) was performed together with analysis of total phenolic content (TPC), total flavonoid content (TFC), total anthocyanins content (TAC), and antioxidant capacity (via ferric reducing antioxidant power (FRAP) and 1,1-diphenyl-2-picrylhydrazyl (DPPH) assays). The differences in polyphenolic content of Rubus idaeus L. pomace were evaluated following ultrasound-assisted extraction and conventional maceration with different organic solvents. Additionally, the yield of free phenolics was measured in hydrolyzed pomace extracts. The results obtained show that the ultrasound method maximizes the quantity of antioxidant compounds in terms of TPC (27.79 mg/L gallic acid equivalent (GAE)), TFC (8.02 mg/g quercetin equivalent (QE)), TAC (7.13 mg/L cyanidine-3-glucoside equivalent (C3G Eq)), caffeic (19.17 µg/g), chlorogenic (3.56 µg/g), ellagic (105.52 µg/g), and gallic acids (8.75 µg/g), as well as FRAP (1002.72 µmol/L) and DPPH assays (969.71 µmol/mL vitamin C equivalent (vit C Eq); 567.00 µmol/100 g Trolox equivalent (TE)). On the other hand, conventional maceration maximizes the yield of quercetin and p-coumaric acid. In terms of biowaste valorization, raspberry fruit pomace has a promising industrial potential and may prove to be useful in the development of antioxidant dietary supplements.

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Antioxidant capacity of Lathyrus sativus seeds

Journal of Food Bioactives ◽

10.31665/jfb.2020.11242 ◽

2020 ◽

Vol 11 ◽

Author(s):

Wojciech Rybiński ◽

Magdalena Karamać ◽

Michał Janiak ◽

Andreas Börner ◽

Natalia Płatosz ◽

...

Keyword(s):

Phenolic Compounds ◽

Antioxidant Capacity ◽

Phenolic Acids ◽

Total Phenolics ◽

Trolox Equivalent Antioxidant Capacity ◽

Total Phenolic ◽

Grass Pea ◽

Phenolic Contents ◽

Trolox Equivalent ◽

Pea Seeds

Grass pea seeds of 30 varieties from Poland, Slovakia, Czech, Russia, Ukraine, Hungary, Bulgaria, India, Iran, Tunisia, Ethiopia, Canada, and Chile were investigated. Phenolic compounds were extracted from seeds into 80% (v/v) methanol. The total phenolics compounds content of the extracts was determined using Folin-Ciocalteu’s phenol reagent. The antioxidant activity was determined using ABTS and FRAP assays. Total phenolic contents ranged from 2.74 to 10.7 mg/g extract and from 35.9 to 144.7 mg/100 g seeds. The extracts and seeds were characterized using Trolox equivalent antioxidant capacity values of 0.014–0.060 mmol Trolox/g extract and 0.188–0.866 mmol Trolox/100 g seeds, and FRAP values of 0.188–0.866 mmol Fe2+/g extract and 0.541–1.398 Fe2+/100 g seeds. The total phenolics content of grass pea extract was correlated with the results of the ABTS (r = 0.854) and FRAP (r = 0.958) assays. A similar correlation existed between the results of both assays (r = 0.890). Phenolic acids were the dominant phenolic compounds of two cultivars of grass pea. Syringic and sinapic acids had the highest amounts while ferulic, p-hydroxybenzoic, protocatechuic, and p-coumaric acids were present in much lower quantitie. Phenolic acids were present in the form of free compounds, esters, and glycosides.

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