Antioxidant activity of various extracts of old tea leaves and black tea wastes (Camellia sinensis L.)

“…Also, Nor Qhairul Izzreen and Mohd Fadzelly (2013) reported higher phenolic content in young tea shoots (80.27 mg/g) in comparison to mature leaves (56.63 mg/g). This decrease in phenolics with maturity of plant part might be due to the morphological changes that occur in leaf with age (Farhoosh et al 2007). The solvent extracts of different tea plant parts [apical bud, 1st leaf, 2nd leaf, 3rd leaf, 4th leaf, 5th leaf, stem, mature leaves, flowers, fruits, roots (R A , R B , R C )] were evaluated for individual catechins, caffeine and theanine content using published RP-HPLC-DAD (Rana et al 2015).…”

Section: Resultsmentioning

confidence: 99%

“…Hence, to meet the soaring demand of these high valuable phytoconstituents, there in emergent need to explore new economical and sustainable sources of these phytochemicals. Various studies have been performed for exploration of major tea constituents from underutilized leaves (Nor Qhairul Izzreen and Mohd Fadzelly 2013) and flowers of tea (Lin et al 2003;Farhoosh et al 2007). These studies revealed the use of underutilized plant parts as potent source of major bioactives.…”

Section: Introductionmentioning

confidence: 99%

Screening and purification of catechins from underutilized tea plant parts and their bioactivity studies

et al. 2016

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Comparative investigation of major phytoconstituents was performed from various parts of tea plant viz. apical bud, subtending 1st-5th leaf, stem, coarse leaves, flowers, fruits and roots. From the results of comparative RP-HPLC-DAD analysis it was found that underutilized tea parts especially coarse leaves, flowers and fruits contains abundant amount of phenolics (17.5%) and catechins (4-5%). From these underutilized tea plant parts the catechins were extracted and purified and then screened for their anticancer, immunomodulatory effect and antimicrobial activity against food borne pathogens. The results showed that tea fruit extract exhibited higher toxicity against oral cancer cells and also promotes proliferation of mice splenocytes. The results of antimicrobial studies revealed the inhibitory effect of these extracts against both gram positive and gram negative bacteria. These investigations clearly demonstrated that the underutilized tea plant parts could act as economical and sustainable bioresource of functionally active constituents which further lead to the development of new cost-effective nutraceuticals and other formulations.

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“…The mechanism of immunostimulation of GTE is still not clear but it may related to one or more of components, especially catechins, flavonols, flavanones, phenolic acids, glycosides, and the aglycones of plant pigments (Farhoosh et al, 2007). These components have powerful natural antioxidants (Farhoosh et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…These components have powerful natural antioxidants (Farhoosh et al, 2007). The usefulness of antioxidants in protecting cellular components against oxidative stress is well established (Mohan et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

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Hasanpour¹,

Salati²,

Falahatkar³

et al. 2017

Turk. J. Fish. Aquat. Sci.

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Effects of green tea in fish based oxidized oil was evaluated in this study. Lipid of diet was replaced by oxidized fish oil (OFO) at 0, 50 and 100% levels. Green tea extract (GTE) was added to diet in 3 levels, 0, 5 and 100 mg/kg giving a total of 9 experimental diets. Two hundred and seventy sturgeon hybrid (Huso huso ♀ × Acipenser ruthenus ♂), mean weight of 211.71±0.23 g randomly divided in 27 fiberglass tanks with 700 l volume after 2 weeks adaptation. After 6 weeks, biometry was done to evaluate growth performance and blood samples were taken. The result showed that feeding with OFO had no effects on condition factor and specific growth rate. However, in fish fed GTE feed efficiency ratio and protein efficiency ratio improved slightly. Red blood cells were not affected by OFO and GTE while in fish received GTE and both GTE and OFO white blood cells increased significantly (P<0.05). Immunological parameters, (IgM, ACH50 and Lysozyme) showed significant increase in compare to control (P<0.05). Our findings showed that feeding of sturgeon hybrid with OFO had no effects on growth but GTE improved feeding performance. Also OFO had no effects on immune function.

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Antioxidant activity of various extracts of old tea leaves and black tea wastes (Camellia sinensis L.)

Cited by 110 publications

References 26 publications

Fontes vegetais naturais de antioxidantes

Fontes vegetais naturais de antioxidantes

Screening and purification of catechins from underutilized tea plant parts and their bioactivity studies

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