Green synthesis of reduce graphene oxide by green tea leaves

: Periodontal diseases are highly prevalent and can affect high percentage of the world population. Oxidative stress and inflammation plays an important role in the pathogenesis of periodontal diseases. Nowadays, more attention has been focused on the herbal remedies in the field of drug discovery. Green tea is an important source of polyphenol antioxidants, it has long been used as a beverage worldwide. The most interesting polyphenol components of green tea leaves that are related with health benefits are the catechins. Taken together this review suggested that green tea with its wide spectrum of activities could be a healthy alternative for controlling the damaging reactions seen in periodontal diseases.

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Development of antibacterial and UV protective cotton fabrics using plant food waste and alien invasive plant extracts as reducing agents for the in-situ synthesis of silver nanoparticles

Cellulose ◽

10.1007/s10570-021-03715-y ◽

2021 ◽

Author(s):

Nina Čuk ◽

Martin Šala ◽

Marija Gorjanc

Keyword(s):

Silver Nanoparticles ◽

Green Tea ◽

Food Waste ◽

Cotton Fabrics ◽

Reducing Agent ◽

Plant Food ◽

Japanese Knotweed ◽

Tea Leaves ◽

Green Tea Leaves

Abstract The development of cellulose-based textiles that are functionalised with silver nanoparticles (AgNP), synthesised according to a green approach, and offer protection against ultraviolet (UV) radiation and pathogenic bacteria is very important today. In the present work we demonstrate the environmentally friendly approach to obtain such textile material by AgNP synthesis directly (in-situ) on cotton fabrics, using water extracts of plant food waste (green tea leaves, avocado seed and pomegranate peel) and alien invasive plants (Japanese knotweed rhizome, goldenrod flowers and staghorn sumac fruit) as reducing agents. The extracts were analysed for their total content of phenols and flavonoids and their antioxidant activity. The synthesised AgNP on cotton were round, of different size and amount depending on the reducing agent used. The highest amount of AgNP was found for samples where Japanese knotweed rhizome extract was used as reducing agent and the lowest where extracts of goldenrod flowers and green tea leaves were used. Regardless of the reducing agent used to form AgNP, all cotton samples showed excellent protection against E. coli and S. aureus bacteria and against UV radiation with UV protection factor values above 50. The best results for UV protection even after the twelve repetitive washing cycles were found for the sample functionalized with AgNP synthesised with an extract of the Japanese knotweed rhizome. Due to the presence of AgNP on cotton, the air permeability and thermal conductivity decreased. AgNP had no effect on the change in breaking strength or elongation of fabrics. Graphic abstract

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Epigallocatechin-3-gallate attenuates acute pancreatitis induced lung injury by targeting mitochondrial reactive oxygen species triggered NLRP3 inflammasome activation

Food & Function ◽

10.1039/d1fo01154e ◽

2021 ◽

Author(s):

Zhu-Lin Luo ◽

Hongyu Sun ◽

Xiao-Bo Wu ◽

Long Cheng ◽

Jian-Dong Ren

Keyword(s):

Reactive Oxygen Species ◽

Acute Pancreatitis ◽

Green Tea ◽

Inflammasome Activation ◽

Oxygen Species ◽

Mitochondrial Reactive Oxygen Species ◽

Tea Leaves ◽

Nlrp3 Inflammasome Activation ◽

Health Promoting ◽

Green Tea Leaves

Green tea has been considered as a health-promoting beverage and is widely consumed worldwide. Epigallocatechin-3-gallate (EGCG), the most abundant polyphenol derived from green tea leaves with potent antioxidative and chemopreventive...

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Comparative Evaluation of the Antifungal Activity ofBorage(Borago officinalis) andCamellia sinesis(Green tea) leaves against variousAspergillusandCandidastrains

Journal of Biologically Active Products from Nature ◽

10.1080/22311866.2014.890063 ◽

2014 ◽

Vol 4 (1) ◽

pp. 29-36

Author(s):

Samaneh Eidi ◽

Hamideh Ghodrati Azadi ◽

Hossein Ghanbari Nehbandani

Keyword(s):

Antifungal Activity ◽

Green Tea ◽

Comparative Evaluation ◽

Tea Leaves ◽

Borago Officinalis ◽

Green Tea Leaves

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Multi-Element Determination for Green Tea Leaves and Their Extractants by ICP-AES with Online Concentration

BUNSEKI KAGAKU ◽

10.2116/bunsekikagaku.58.699 ◽

2009 ◽

Vol 58 (8) ◽

pp. 699-706 ◽

Cited By ~ 3

Author(s):

Hua Jin ◽

Akhmad Sabarudin ◽

Mitsuko Oshima ◽

Shoji Motomizu

Keyword(s):

Green Tea ◽

Tea Leaves ◽

Element Determination ◽

Green Tea Leaves

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Optimization of HIB Value Combination of Tween 60 and Span 80 on Cream Formulation of Ethanol Extract of Green Tea Leaves (Camellia Sinensis L.)

Majalah Obat Tradisional ◽

10.22146/mot.38402 ◽

2018 ◽

Vol 23 (3) ◽

pp. 124

Author(s):

Fransiska Lisa Anindya Putri ◽

Akhmad Kharis Nugroho ◽

Erna Prawita Setyowati

Keyword(s):

Antioxidant Activity ◽

Green Tea ◽

Camellia Sinensis ◽

Ethanol Extract ◽

Tea Leaves ◽

Lattice Design ◽

Dpph Method ◽

Green Tea Leaves ◽

Span 80 ◽

Tween 60

Green tea (Camellia sinensis L.) is known to have ability to protect skin against free radicals. This is supported by polyphenol compound catechin. This research aims to determine the optimum Hydrophilic-Lipophilic Balance (HLB) value of Tween 60 and Span 80 compositions on the optimum cream formula of ethanol extract of green tea leaves. Tea leaves are extracted by macerating using 70% ethanol. Catechin in extract is known from Thin Layer Chromatography (TLC) test with silica gel 60 F254 as stationary phase and ethyl acetate:aquadest:formic acid (18:1:1 v/v) as mobile phase. Antioxidant activity is determined by 2,2-Diphenyl-1-picryhydrazyl (DPPH) method and value of Inhibition Concentration 50% (IC50) is then calculated. Formula optimization using Design Expert® version 7.1.5 (DX 7) software, Simplex Lattice Design (SLD) method with two components Tween 60 and Span 80. Cream is characterized according to physical properties organoleptic, homogeneity, viscosity, pH, spreadability, adhesiveness, and cream type. The optimum formula obtained is then tested for physical stability for 4 weeks at room temperature (28±2°C) and data are statistically analyzed using one-way ANOVA. The extract contains catechin proved with Retention factor (Rf) value 0.8 and has antioxidant activity with IC50 value 56.35 ppm. 6.4% Tween 60 and 3.6% Span 80 result an optimum HLB value 11.1. It has viscosity 2897.50±35.94 mPa.s, spreadability 18.44±0.06 cm2, adhesiveness 0.85±0.05 seconds, and pH 4.530±0.002. Statistical test shows that the cream is significantly altered at pH, but does not significantly change in viscosity, spreadability, and adhesiveness after being stored for 4 weeks.

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