Recent advances in the processing of green tea biomolecules using ethyl lactate. A review
Conclusions A diversity of results has been reported for the different green solvents and extraction techniques studied to remove caffeine from green tea leaves and extracts in the last years. Nevertheless, despite the solvent used, the loss of catechins is unavoidable to some extent. In this sense, ethyl lactate has demonstrated higher selectivity and efficiency with respect to commercial and other agrochemical solvents currently used to that end. Additionally, combining ethyl lactate with Supercritical CO2 Anti-Solvent technique, a decaffeinated green tea precipitate could be obtained, overcoming limitations of presently...
Source: Trends in Food Science and Technology - January 31, 2017 Category: Food Science Source Type: research
Metabolomic profiling delineate taste qualities of tea leaf pubescence
Publication date: Available online 1 February 2017 Source:Food Research International Author(s): Mingzhi Zhu, Na Li, Ming Zhao, Wenliang Yu, Jian-Lin Wu The amount of pubescence on leaf epidermis is an important morphological marker for the quality of green tea, and the tea with plenty of pubescence is generally recognized as having a better taste. However, there is no systematic study on chemical compositions of tea leaf pubescence. The contributions of pubescence to taste properties are far from clear. In this research, 114 components were identified from the tea leaf pubescence of yunkang 10, a broad-leaf tea cul...
Source: Food Research International - January 31, 2017 Category: Food Science Source Type: research
Coffee and tea consumption and risk of leukaemia in an adult population: A reanalysis of the Italian multicentre case-control study
Conclusion The lower risk of leukaemia among regular coffee consumers, reported by a few of previous small studies, was not confirmed. The protective effect of tea on the AML risk is only partly consistent with results from other investigations. (Source: Cancer Epidemiology)
Source: Cancer Epidemiology - January 30, 2017 Category: Cancer & Oncology Source Type: research
Effect of green tea mouth rinse on Streptococcus mutans in plaque and saliva in children: An in vivo study
Conclusion: Hence, finally, our study showed that green tea catechin is effective as a mouth wash against S. mutans and having better action in plaque as compared to saliva. It can be used as an adjunct to commercially available mouthwashes. (Source: Journal of Indian Society of Pedodontics and Preventive Dentistry)
Source: Journal of Indian Society of Pedodontics and Preventive Dentistry - January 30, 2017 Category: Dentistry Authors: Anil Kumar Goyal Manohar Bhat Meenakshi Sharma Mamta Garg Abhishek Khairwa Rakesh Garg Source Type: research
Pest management through Bacillus thuringiensis (Bt) in a tea-silkworm ecosystem: status and potential prospects.
Abstract
Bacillus thuringiensis (Bt) is a soil bacterium that forms spores containing crystals comprising one or more Cry or Cyt proteins having potential and specific insecticidal activity. Different strains of Bt produce different types of toxins, affecting a narrow taxonomic group of insects. Therefore, it is used in non-chemical pest management, including inherent pest resistance through GM crops. The specificity of action of Bt toxins reduces the concern of adverse effects on non-target species, a concern which remains with chemical insecticides as well. To make use of Bt more sustainable, new strains...
Source: Applied Microbiology and Biotechnology - January 30, 2017 Category: Microbiology Authors: Dashora K, Roy S, Nagpal A, Roy SM, Flood J, Prasad AK, Khetarpal R, Neave S, Muraleedharan N Tags: Appl Microbiol Biotechnol Source Type: research
Iron oxide nanoparticles coated with green tea extract as a novel magnetite reductant and stabilizer sorbent for silver ions: Synthetic application of Fe3O4@green tea/Ag nanoparticles as magnetically separable and reusable nanocatalyst for reduction of 4 ‐nitrophenol
Green tea extract having many phenolic hydroxyl and carbonyl functional groups in its molecular framework can be used in the modification of Fe3O4 nanoparticles. Moreover, the feasibility of complexation of polyphenols with silver ions in aqueous solution can improve the surface properties and capacity of the Fe3O4@green tea extract nanoparticles (Fe3O4@GTE NPs) for sorption and reduction of silver ions. Therefore, the novel Fe3O4@GTE NPs nano‐sorbent has potential ability as both reducing and stabilizing agent for immobilization of silver nanoparticles to make a novel magnetic silver nanocatalyst (Fe3O4@GTE/Ag NPs). Ind...
Source: Applied Organometallic Chemistry - January 29, 2017 Category: Chemistry Authors: Hojat Veisi, Fatemeh Ghorbani Tags: FULL PAPER Source Type: research
Tea polyphenols dominate the short-term tea (Camellia sinensis) leaf litter decomposition.
This study aims to monitor the mass loss rate of tea leaf litter and nutrient release pattern, and investigate the role of tea polyphenols played in this process. High-performance liquid chromatography (HPLC) and classical litter bag method were used to simulate the decomposition process of tea leaf litter and track the changes occurring in major polyphenols over eight months. The release patterns of nitrogen, potassium, calcium, and magnesium were also determined. The decomposition pattern of tea leaf litter could be described by a two-phase decomposition model, and the polyphenol/N ratio effectively regulated the degrada...
Source: J Zhejiang Univ Sci ... - January 28, 2017 Category: Science Authors: Fan DM, Fan K, Yu CP, Lu YT, Wang XC Tags: J Zhejiang Univ Sci B Source Type: research
Consumption of coffee and tea with add-ins in relation to daily energy, sugar, and fat intake in US adults, 2001 –2012
Coffee and tea are among the most widely consumed beverages in US adults.1,2 Unlike other popular beverages including alcohol and sugar-sweetened beverages that are typically consumed in isolation, many people prefer drinking coffee and tea with add-ins like sugar or cream. These add-in items are often dense in energy and fat but low in nutritional value. Drinking coffee and tea with add-ins on a regular basis might impact an individual's daily energy/nutrient intake and diet quality.3 The 2015 –2020 Dietary Guidelines for Americans suggests that ‘coffee, tea, and flavored waters also can be selected, but calories from...
Source: Public Health - January 25, 2017 Category: Global & Universal Authors: R. An, Y. Shi Tags: Short Communication Source Type: research
Tea silkworm droppings as an enriched source of tea flavonoids
Publication date: Available online 25 January 2017 Source:Journal of Food and Drug Analysis Author(s): Tzu-Yun Chou, Meei-Ju Yang, Shih-Kung Tseng, Shoei-Sheng Lee, Chia-Chuan Chang Andraca droppings are the waste excreted by the tea biter, Andraca theae. Their chemical constituents and potential medical use, unlike those of the traditional Chinese medicine silkworm droppings, have not yet been reported. To explore new nutraceuticals, the chemical constituents of this substance were investigated as the bioactive ingredients are generally present in the ethyl acetate (EtOAc)-soluble fraction. This fraction, obtained ...
Source: Journal of Food and Drug Analysis - January 24, 2017 Category: Food Science Source Type: research
Effects of 10 weeks of high intensity interval training and green tea supplementation on serum levels of Sirtuin-1 and peroxisome proliferator-activated receptor gamma co-activator 1-alpha in overweight women
Conclusion Based on the findings, it can be concluded that the supplementation of green tea with high intensity interval training can significantly reduce weight, body mass index, and undesirable effects of obesity and overweight by increasing the levels of STRT1 and PGC-1α. (Source: Science and Sports)
Source: Science and Sports - January 24, 2017 Category: Sports Medicine Source Type: research
Safety Evaluation of Fluoride Content in Tea Infusions Consumed in the Azores-a Volcanic Region with Water Springs naturally Enriched in Fluoride.
Abstract
Tea is the second most commonly consumed beverage in the world. It is well recognized that the consumption of tea in high quantities can promote the development of fluorosis. The main objective of this study is to estimate the exposure to fluoride in the Azores through drinking tea prepared with water from different volcanic locations, by i) investigating the fluoride (F) content of various commercial brands of tea (Camellia sinensis) marketed in Azores and ii) comparing tea releasing rates of F according to brewing time, considering the fluoride concentration in the different types of water used ...
Source: Biological Trace Element Research - January 23, 2017 Category: Biology Authors: Linhares DP, Garcia PV, Amaral L, Ferreira T, Dos Santos Rodrigues A Tags: Biol Trace Elem Res Source Type: research
An Appraisal of Drug-Drug Interactions with Green Tea (Camellia sinensis)
In conclusion, the ingestion of green tea extract or its associated catechins is not expected to result in clinically significant influences on major cytochrome P450 or uridine 5′-diphospho-glucuronosyltransferase enzyme substrates or drugs serving as substrates of P-glycoprotein. However, some caution is advised in the consumption of significant amounts of green tea beverages or green tea extract in patients prescribed known substrates of organic anion transporting polypeptide, particularly those with a narrow therapeutic index. [...] Georg Thieme Verlag KG Stuttgart · New YorkArticle in Thieme eJournals: Table of cont...
Source: Planta Medica - January 23, 2017 Category: Drugs & Pharmacology Authors: Albassam, Ahmed A. Markowitz, John S. Tags: Reviews Source Type: research
Relationship between multi-element composition in tea leaves and in provenance soils for geographical traceability
The objective of this study was to select the elements in tea leaves correlated with provenance soils, and further build a robust discriminant model of tea according to the geographical origin. Fresh tea leaves along with corresponding topsoil and subsoil samples were collected from three different tea producing regions in China. The concentrations of 20 elements were determined in tea leaf and soil samples. Analysis of variance, Pearson correlation analysis and linear discriminant analysis were used to analyze the obtained data. The results indicated that elemental fingerprinting profiles were different for tea leaves and...
Source: Food Control - January 23, 2017 Category: Food Science Source Type: research
Korean Chungtaejeon tea extract attenuates weight gain in C57BL/6J-Lep ob/ob mice and regulates adipogenesis and lipolysis in 3T3-L1 adipocytes
Conclusion CTJ attenuated weight gain in ob/ob mice and regulated the activity of the molecules involved in adipogenesis and lipolysis in 3T3-L1 adipocytes. CTJ is a potentially valuable herbal therapy for the prevention of obesity and/or obesity-related disorders. (Source: Journal of Integrative Medicine)
Source: Journal of Integrative Medicine - January 19, 2017 Category: Complementary Medicine Source Type: research
Black tea volatiles fingerprinting by comprehensive two-dimensional gas chromatography – Mass spectrometry combined with high concentration capacity sample preparation techniques: Toward a fully automated sensomic assessment
This study aims to obtain an informative chemical signature of the volatile fraction of black tea samples from Ceylon by applying the principles of sensomics. In particular, several high concentration capacity (HCC) sample preparation techniques were tested in combination with GC×GC–MS to investigate chemical signatures of black tea volatiles. This platform, using headspace solid phase microextraction (HS-SPME) with multicomponent fiber as sampling technique, recovers 95% of the key-odorants in a fully automated work-flow. A group 123 components, including key-odorants, technological and botanical tracers, were mapped. ...
Source: Food Chemistry - January 17, 2017 Category: Food Science Source Type: research
