scholarly journals Optimizing Spacer Length for Positioning Functional Groups in Bio-Waste

Environments ◽  
2018 ◽  
Vol 5 (9) ◽  
pp. 100 ◽  
Author(s):  
Revathi Iyengar ◽  
Maria Faure-Betancourt ◽  
Saleh Talukdar ◽  
Jinting Ye ◽  
Abel Navarro
Keyword(s):  
Functional Groups ◽  
Amine Group ◽  
Ambient Conditions ◽  
Tea Leaves ◽  
Acid Base ◽  
Spacer Length ◽  
Dipole Interactions ◽  
Green Tea Leaves ◽  
Better Than ◽  
Spent Tea Leaves

The goal of this study was to determine the optimal chain length needed for tethering functional groups on bio-wastes. The purpose of modifying the surface of bio-waste is to improve their affinity for phenols. To this end, four different aminated green tea leaves, with the amine group located at the end of 6, 8, 10, and 12 carbons were synthesized. Green approaches to functionalization lead to fewer reactive sites. Optimizing spacer length is one way to ameliorate this. The aminated tea leaves were prepared by a tosylation reaction followed by displacement with a diamine used in excess. The tea leaves with the amine at the end of six carbons proved to have the best ability to remove 2-chlorophenol (2-CP) from its aqueous solution. It was at least 3–4 times better than native spent tea leaves. The mechanism by which the phenol was removed proved to be primarily an acid–base reaction followed by H-bonding and dipole–dipole interactions. Because of the acid–base interactions, the relatively low-boiling 2-CP did not volatilize off the aminated tea leaves enabling recycling. On the other hand, with activated charcoal, the adsorbed 2-CP volatilized almost completely under ambient conditions.

scholarly journals Preparation and Characterization of Chemically-Modified Biomaterials and Their Application as Adsorbents of Penicillin G

2018 ◽  
Vol 1 (1) ◽  
pp. 114-124 ◽  
Author(s):  
Jesie Silva ◽  
Lizebel Morante ◽  
Tesfamichael Demeke ◽  
Jacqueline Baah-Twum ◽  
Abel Navarro
Keyword(s):  
Chemical Modification ◽  
Functional Groups ◽  
Negative Impact ◽  
Ph Dependence ◽  
Sem Analysis ◽  
Penicillin G ◽  
Tea Leaves ◽  
Reaction Conditions ◽  
Spent Tea Leaves

The prevalence of antibiotics in water creates microbial resistance and has a negative impact on the ecosystem. Biomaterials such as spent tea leaves are rich in functional groups and are suitable for chemical modification for diverse applications. This research proposes the use of spent tea leaves of chamomile (CM), green tea (GT), and peppermint (PM) as structural scaffolds for the incorporation of carboxyl, sulfonyl, and thiol groups to improve the adsorption of Penicillin G (Pe). Adsorbents characterization reported a higher number of acidic functional groups, mainly in thiolated products. Scanning electron microscopy (SEM) analysis showed changes on the surfaces of the adsorbents due to reaction conditions, with a stronger effect on thiolated and sulfonated adsorbents. Elemental analysis by Energy dispersive X-ray spectrophotometry (EDS) corroborated the chemical modification by the presence of sulfur atoms and the increase in oxygen/carbon ratios. Batch experiments at different pH shows a strong pH-dependence with a high adsorption at pH 8 for all the adsorbents. The adsorption follows the trend CMs > GTs > PMs. Thiolation and sulfonation reported higher adsorptions, which is most likely due to the sulfur bridge formation, reaching adsorption percentages of 25%. These results create a new mindset in the use of spent tea leaves and their chemical modifications for the bioremediation of antibiotics.

Effects of Soil Selenium Supplementation Level on Selenium Contents of Green Tea Leaves and Milk Vetch

2007 ◽  
Vol 12 (1) ◽  
pp. 35-39 ◽  
Author(s):  
Dae-Jin Kim ◽  
Dae-Soo Chung ◽  
Sung-Chul C. Bai ◽  
Hyeong-Soo Kim ◽  
Yu-Bang Lee
Keyword(s):  
Green Tea ◽  
Selenium Supplementation ◽  
Tea Leaves ◽  
Green Tea Leaves

The potential role of tea in periodontal therapy: An updated review

2020 ◽  
Vol 17 ◽  
Author(s):  
Ali Forouzanfar ◽  
Hamideh Sadat Mohammadipour ◽  
Fatemeh Forouzanfar
Keyword(s):  
Green Tea ◽  
Potential Role ◽  
Wide Spectrum ◽  
Periodontal Diseases ◽  
Herbal Remedies ◽  
World Population ◽  
Tea Leaves ◽  
The World ◽  
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.

Aspirin Adsorption onto Activated Carbon Derived from Spent Tea Leaves: Statistical Optimization and Regeneration Study

2021 ◽  
Author(s):  
Syie Luing Wong ◽  
Mohamed Hizam Mohamed Noor ◽  
Norzita Ngadi ◽  
Ibrahim Mohammed Inuwa ◽  
Ramli Mat ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Statistical Optimization ◽  
Tea Leaves ◽  
Regeneration Study ◽  
Spent Tea Leaves

scholarly journals Green synthesis of reduce graphene oxide by green tea leaves

2021 ◽  
Vol 1795 (1) ◽  
pp. 012070
Author(s):  
Hamsa A. Abdulmageed ◽  
Abdulhadi. K. Judran ◽  
Farah T. M. Noori
Keyword(s):  
Graphene Oxide ◽  
Green Synthesis ◽  
Green Tea ◽  
Reduce Graphene Oxide ◽  
Tea Leaves ◽  
Green Tea Leaves

scholarly journals 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 ◽  
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

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

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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