Physicochemical, antioxidant and antimicrobial activities of green teas manufactured from common tea clones of different gardens in Bangladesh

Sarkar, Animesh; Alam, Mahabub; Roy, Prantik; Biswas, Rahul; Haque, Md Ismail

doi:10.1016/j.jafr.2022.100407

Cited by 7 publications

(8 citation statements)

References 42 publications

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“…The value of IC50 was used in the in vitro study. This potential antioxidant activity could be explained by the presence of the phenolic compounds related to different mechanisms, such as free radical scavenging, hydrogen donation, singlet oxygen quenching and metal ion-chelation and acting as substrates for radicals such as superoxide and hydroxyl (Kim et al, 2014, Sarkar et al, 2022.…”

Section: Total Phenolic and Flavonoid Contents And Antioxidant Activi...mentioning

confidence: 99%

“…A positive correlation between the consumption of green tea (camellia sinensis) and beneficial antioxidant, antiinflammatory and anti-carcinogenic effects have been suggested by several studies. The deleterious effects of oxidative stress are counteracted by natural antioxidants defence mechanisms that involve enzyme and nonenzyme detoxification systems (Sarkar et al, 2022). Green tea is attracted undergoing clinical trials due to its *Corresponding author: e-mail: nacera_haroun@yahoo.fr chemo-protector and anti-oxidant properties (Shakeela Begum et al, 2017).This present study aims to investigate the ameliorative role of green tea on nicotine-induced hematotoxicity, oxidative stress, inflammation and structural lesions in bone marrow and spleen.…”

Section: Introductionmentioning

confidence: 99%

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2023

Pak. J. Pharm. Sci.,

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We investigate the effects of green tea extract (GTE) on the attenuation of nicotine hematotoxicity, oxidative stress, inflammation and spleen and bone marrow structural lesions. Rats were treated by injecting nicotine (1,5mg/kg b.w. for 7 weeks) intraperitoneally and thereby supplementing GTE 2% orally to them. Haematological profiles, inflammation markers, neutrophil/lymphocyte (NLR), platelet/lymphocyte (PLR) and mean platelet volume (MPV/Plat) ratios-and erythrocyte sedimentation rate (ESR) were evaluated. Splenic levels of malondialdehyde (MDA), nitric oxide (NO), advanced protein oxidation products (AOPP) and catalase activity were measured. Femur bone and spleen were subjected to histological study. Nicotine-induced haematological abnormalities, a rise in the NLR and MPV/Plat ratios and ESR values with a drop in the PLR values compared to other experimental groups and leads to a significant increase in MDA, NO and AOPP levels-with a decrease in catalase activity compared to control groups. The bone marrow and spleen of nicotine exposed rats showed severe degenerative changes. GTE supplementation attenuates hematotoxicity, induce a decrease in the inflammation markers values, improved the levels of MDA, NO, AOPP and catalase activity and attenuate the adverse histological effects. GTE rich on polyphenols and flavonoids revealed by the in vitro study protects against the hazardous effects of nicotine.

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Section: Total Phenolic and Flavonoid Contents And Antioxidant Activi...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Untitled

2023

Pak. J. Pharm. Sci.,

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“…Tea plant has thousands of years of cultivation and utilization history in China. According to the different processing methods, tea leaves are classified into green tea, black tea, oolong tea, dark tea, white tea and yellow tea 2–4 . Green tea, a non‐fermented tea, is rich in various active secondary metabolites, and is famous for its health benefits, including anti‐oxidant, anti‐obesity and anticancer effects.…”

Section: Introductionmentioning

confidence: 99%

“…According to the different processing methods, tea leaves are classified into green tea, black tea, oolong tea, dark tea, white tea and yellow tea. [2][3][4] Green tea, a nonfermented tea, is rich in various active secondary metabolites, and is famous for its health benefits, including anti-oxidant, anti-obesity and anticancer effects. In 2022, green tea production reached 1.85 million tons in China, accounting for 58.28% of the total output and its output value reached 205.82 billion yuan (RMB), accounting for 64.71% of the total output value, keeping the position of largest production and output value.…”

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confidence: 99%

Chemical composition and discrimination with volatile profiles of Yongchuan Xiuya green tea with different baking treatments

Luo,

Wang,

Chang

et al. 2024

Flavour & Fragrance J

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This study aimed to explore the effects of different baking treatments on the quality of Yongchuan Xiuya (YCXY) green tea. It was found that a long time baking at low temperature was beneficial to keep green colour, faint scent, mellow and fresh taste quality, whereas baking under high temperature was adverse to the quality. Baking treatments slightly regulated (−)‐epigallocatechin, (−)‐epicatechin, (−)‐gallocatechin gallate, total chlorophyll and carotenoid. As the baking temperature rose, the content of tea polyphenols, gallic acid, catechins, caffeine, soluble sugar and polyphenols/amino acids ratio obviously decreased. A total of 40 kinds of volatiles were detected in these six tea samples. A model for aroma type discrimination was successfully established based on partial least squares‐discriminant analysis (PLS‐DA). Ten kinds of volatile substances were the key characteristic markers for the faint scent, chestnut aroma and high‐fired aroma types of YCXY green tea. 1‐hexanol, hotrienol and dimethyl sulfide were furtherly used to discriminant aroma type based on Fisher discriminant analysis (FDA).

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“…[8][9][10] Several investigations associated with the phytochemical analyses, antioxidant activity and antimicrobial effects of black and green tea compounds in Bangladesh have been conducted. [11][12][13][14] However, no cytotoxic assay has been used previously to evaluate the anticancer efficacy of any of the marketed green tea products. Therefore, the objective of this study is to compare the phytochemical constituents and biological activities including anticancer potential of multiple green tea brands marketed in Bangladesh.…”

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Comparative Phytochemical and Biological Analyses of commercial Green Tea Products Marketed in Dhaka, Bangladesh

2023

TJNPR

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IntroductionGreen tea refers to a product made from fresh tea leaves by steaming or pan-frying to deactivate the enzyme polyphenol oxidase, thereby preventing the oxidation of polyphenolic components such as catechins. Camellia thea is a synonym of the green tea plant. 1 Camellia sinensis sinensis and Camellia sinensis assamica are the two most common varieties of C. sinensis. Typically, sinensis variety produces green tea, while the assamica variety generates black tea. 2 Considering its health benefits, green tea has been recognized to be superior to black tea since it possesses more polyphenols. Flavonoids are the predominant polyphenols present in green tea. Catechins and theanine are the two primary constituents unique to green tea, and their antioxidant and other medicinal values are gaining a great deal of attention worldwide. Green tea has been included into the category of beverages with functional qualities as a result of the growing interest in its therapeutic implications.

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Physicochemical, antioxidant and antimicrobial activities of green teas manufactured from common tea clones of different gardens in Bangladesh

Cited by 7 publications

References 42 publications

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Chemical composition and discrimination with volatile profiles of Yongchuan Xiuya green tea with different baking treatments

Comparative Phytochemical and Biological Analyses of commercial Green Tea Products Marketed in Dhaka, Bangladesh

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