Green Tea Extract

Houston, Neil; Kimball, Alexa B.

doi:10.1002/9781118384824.ch12

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…It has observed a high demand and interest of people on dietary supplements with green tea extract on account of their high values of antioxidant activity (AOA) [2]. Green tea has a significant high antioxidant potential owing to the presence in leaves flavon-3-ols or other name catechins [3]. These compounds differ from other poly phenols in that both carbonyl and hydroxyl groups are absent in the 4 positions.…”

Section: актуальные вопросы фармацевтической и медицинской науки и практики 2021 т 14 № 2(36) с 215-219mentioning

confidence: 99%

Study and evaluation antioxidant activity of dietary supplements with green tea extract

Maslov¹,

Kolisnyk²,

Komisarenko³

et al. 2021

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The aim of the work is to determine and evaluate the antioxidant activity of dietary supplements with green tea extract, as well as to introduce conditional terms of the level of AOA. Materials and methods. The object of the study was dietary supplements of different manufactures: “Green Tea Extract” of Natural Sources, USA (DS1), “Extract of green tea” of Elit-Pharm, Ukraine (DS2) and “Green tea” of Pharmakom, Ukraine (DS3). Potentiometric measurements were conducted by pH meter Hanna 2550 (Germany) with a combined platinum electrode EZDO 5010. Epigallocatechin-3-O-gallate ˃98.0 % (Sigma Aldrich), K3[Fe(CN)6], K4[Fe(CN)6], NaHPO4, KH2PO4 were analytical grade. Results. It was established that a value of the antioxidant activity of DS1 was 36.51 mmol/tab, DS2 – 29.78 mmol/tab, and DS3 – 16.67 mmol/tab. DS1 had the highest value of the antioxidant activity, which correlated with the content of catechins (r2 = 0.9314). According to the proposed conditional terms of antioxidant activity dietary supplements, DS1 and DS2 possessed a low level of antioxidant activity, whereas DS3 corresponded to very low level of antioxidant activity. Conclusions. It was found that the studied dietary supplements with green tea extract have antioxidant activity, which correlates with the content of catechins.

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Section: актуальные вопросы фармацевтической и медицинской науки и практики 2021 т 14 № 2(36) с 215-219mentioning

confidence: 99%

Study and evaluation antioxidant activity of dietary supplements with green tea extract

Maslov¹,

Kolisnyk²,

Komisarenko³

et al. 2021

АПФМНП

View full text Add to dashboard Cite

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Study of the qualitative composition and quantitative content of some groups of BAS in dietary supplements with green tea leaf extract

Maslov¹,

Kolisnyk²,

Hrechana³

et al. 2021

ZMJ

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Recently, there has been a high demand from the population for dietary supplements that have antioxidant activity. First of all, these are dietary supplements with green tea leaf extract, because green tea contains catechins in a fairly high amount. Nowadays, according to the current legislation of Ukraine the qualitative composition and quantitative content of biologically active substances in dietary supplements are not established, which to a certain extent affects the quality and safety of these products. The aim of the study was to determine the qualitative composition and quantitative content of some groups of BAS in dietary supplements with green tea leaf extract. Materials and methods. Three dietary supplements from different manufacturers “Green Tea Extract”, “Green Tea Extract”, “Green Tea” were chosen for the study. Qualitative analysis was performed by thin layer chromatography, for quantification spectrophotometry in the UV-region was used. Results. The presence of catechins was found in the studied dietary supplements, caffeine was found only in trace amounts. The total content of catechins is 146.80 ± 1.36 mg, 79.00 ± 0.88 mg, 28.00 ± 0.75 mg, and in terms of green tea extract, which is stated in dietary supplements for dietary supplements “Green Tea Extract”, “Green Tea Extract”, “Green Tea”, respectively. Conclusions. Qualitative and quantitative analysis of some groups of BAS of three dietary supplements with green tea leaf extract was performed. It was found that dietary supplements “Green Tea Extract” and “Green Tea” meet the requirements of the US Pharmacopoeia 38 in terms of catechins. Based on the study, it can be concluded that the problem of compliance with dietary supplements is relevant today and requires the introduction of regulatory documentation for the detection and determination of biologically active substances in dietary supplements.

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Green Tea Extract

Cited by 2 publications

References 8 publications

Study and evaluation antioxidant activity of dietary supplements with green tea extract

Study and evaluation antioxidant activity of dietary supplements with green tea extract

Study of the qualitative composition and quantitative content of some groups of BAS in dietary supplements with green tea leaf extract

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