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green tea

Chen-Wei Pan, Deng-Juan Qian, Hong-Peng Sun, Qinghua Ma, Yong Xu, E Song
Purpose. To determine the prevalence, causes, and associations of visual impairment (VI) among participants aged 60 years or older in a rural community in China. Methods. A community-based survey was undertaken in a rural town located in Eastern China and 4579 people aged 60 years or older participated in the study. Presenting visual acuity was assessed using a Snellen chart with tumbling-E optotypes and anterior segment was examined using a slit-lamp. VI was defined as presenting VA <6/18 and it included moderate VI (<6/18 to 6/60) and blindness (<6/60)...
2016: Journal of Ophthalmology
Ji-Yuan Liang, Jun-Yun Wu, Ming-Yeh Yang, Anren Hu, Liang-Yü Chen
Polyphenols are associated with a wide range of physiological properties. Catechin is a flavan-3-ol with five phenolic hydroxyl groups. After blue light illumination, the transparent solution of catechin became yellowish. The effects of visible light illumination (400-800nm) were investigated on molecular structures and antioxidant capacities of catechin. Under the neutral or alkaline aqueous with the illumination of blue light, the photolysis and polymerization of catechin were observed in this study. A chromogenic catechin dimer was separated and identified as a proanthocyanidin by the chromatographic technique and mass spectrometry...
October 19, 2016: Journal of Photochemistry and Photobiology. B, Biology
Wan K Kim-Park, Eman S Allam, Jadesada Palasuk, Michael Kowolik, Kichuel K Park, L Jack Windsor
Green tea (Camellia sinensis; lǜ chá) extracts have been shown to possess anti-oxidant and anti-inflammatory effects in various cell types. Green tea extract (GTX) has been shown to significantly inhibit the activity of collagenase-3 (matrix metalloproteinase-13 (MMP-13)) in vitro. MMPs, such as MMP-9, are known to be involved in many inflammatory diseases including periodontal disease. GTX and a major catechin, epigallocatechin-gallate (EGCG), were examined for their ability to inhibit purified MMP-9 activity and its release from stimulated neutrophils...
October 2016: Journal of Traditional and Complementary Medicine
Yohei Shirakami, Hiroyasu Sakai, Takahiro Kochi, Mitsuru Seishima, Masahito Shimizu
The mechanisms of action of polyphenols have attracted much attention. Catechins are generally known as tea polyphenols. Researchers have extensively investigated the molecular mechanisms of these substances, especially (-)-epigallocatechin gallate of green tea catechin, and have provided new insights in the prevention and therapy for chronic diseases. This chapter summarizes catechins and their effects on chronic diseases, including metabolic syndromes, cardiovascular diseases, neurodegenerative diseases, and cancer, focusing on the effects of green tea catechins...
2016: Advances in Experimental Medicine and Biology
Roberta E Rossi, Tara Whyand, Charles D Murray, Mark I Hamilton, Dario Conte, Martyn E Caplin
Inflammatory bowel diseases (IBD) are chronic immune disorders of unclear aetiology. Dietary deficiencies may be a potential pathogenic factor in their development. Patients often take food supplements without knowledge of any evidence base. We have therefore assessed the evidence for food supplementation in the management of IBD. A PubMed search was performed for the terms Inflammatory bowel disease; nutritional deficiencies; dietary supplements; curcumin; green tea; vitamin D/other vitamins; folic acid; iron; zinc; probiotics; andrographis paniculata; and boswellia serrate...
December 2016: European Journal of Gastroenterology & Hepatology
Keiko Unno, Ayane Hara, Aimi Nakagawa, Kazuaki Iguchi, Megumi Ohshio, Akio Morita, Yoriyuki Nakamura
BACKGROUND: Theanine, an amino acid in tea, has significant anti-stress effects on animals and humans. However, the anti-stress effects of drinking green tea have not yet been elucidated. HYPOTHESIS/PURPOSE: The present study aimed to explore anti-stress effects of green tea and roles of tea components in a mouse model of psychosocial stress. STUDY DESIGN: We examined anti-stress effects of three types of green teas, theanine-rich "Gyokuro", standard "Sencha", and Sencha with lowered caffeine (low-caffeine green tea)...
November 15, 2016: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
Yoo Seob Shin, Sung Un Kang, Ju Kyeong Park, Yang Eun Kim, Yeon Soo Kim, Seung Joon Baek, Seong-Ho Lee, Chul-Ho Kim
BACKGROUND AND PURPOSE: Aberrant expression of β-catenin is highly associated with progression of various cancers including head and neck cancer (HNC). Green tea is most commonly used beverage in the world and one of the more bioactive compounds is the antioxidant epigallocatechin gallate (EGCG). This study was performed to investigate the mechanism by which EGCG inhibits the growth of HNC, focusing on the modulation of the expression and activity of β-catenin. METHODS: In vitro effects of EGCG on the transcription, translation, or degradation of β-catenin were investigated...
November 15, 2016: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
Brian J Martin, Chris McGlory, Martin J MacInnis, Mary K Allison, Stuart M Phillips, Martin J Gibala
We reported that supplementation with green tea extract (GTE) lowered the glycemic response to an oral glucose load following exercise but via an unknown mechanism. Here we examined the effect of supplementation with GTE on plasma glucose kinetics upon ingestion of a glucose beverage during exercise recovery. Eleven healthy, sedentary men (21±2 y; BMI=23±4 kg•m(-2), VO2peak=38±7 ml•kg(-1)•min(-1); mean±SD) ingested GTE (350 mg) or placebo (PLA) thrice daily for 7-d in a double-blind, crossover design...
October 7, 2016: Journal of Applied Physiology
Naga Pavan Kumar Chevala, Naga Thirumalesh Chevala, Kirubakaran Dhanakodi, Rama Rao Nadendla, Chandrashekara Krishnappa Nagarathna
BACKGROUND: Tea is an economic important crop with high medicinal value due to rich polyphenols content. In the present research we studied the accumulation of polyphenols of in vitro regenerated callus from anthers. OBJECTIVE: Callus induction of tea anthers and in vitro accumulation of phenolic compounds from the anther-derived callus. MATERIALS AND METHODS: Standardization of callus induction for tea anthers. In vitro generated callus was screened for in vivo accumulation of catechins and its isomers were screened by FC reagent staining technique...
July 2016: Pharmacognosy Magazine
Horrolein Arab, Soleiman Mahjoub, Karimollah Hajian-Tilaki, Mehdi Moghadasi
BACKGROUND: Alzheimer's disease (AD) is the most prevalent degenerative disorder of the brain among elderly individuals. Many studies indicate that oxidative stress is an important pathogenic factor which involves oxidizing macromolecules such as DNA, lipids, and proteins in AD. Green tea is a rich source of antioxidant compounds that can remove radical oxygen species. The purpose of this study was to investigate the influence of green tea consumption on markers of oxidative stress in AD...
2016: Caspian Journal of Internal Medicine
Shuyun Wu, Minghua Lai, Jiahao Luo, Jingwen Pan, Li-Ming Zhang, Liqun Yang
To understand the mechanism responsible for the α-amylase inhibitory activity of tea polysaccharides, the interaction between α-amylase and an acidic branched tea polysaccharide (TPSA) was investigated using fluorescence spectroscopy and resonance light scattering analysis. TPSA, exhibiting inhibitory activity towards α-amylase (the maximum inhibition percentage of 65%), was isolated from green tea (Camellia sinensis) and characterized by nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy, and gas chromatography...
October 15, 2016: International Journal of Biological Macromolecules
Ji-Young Choi, Ye Jin Kim, Ri Ryu, Su-Jung Cho, Eun-Young Kwon, Myung-Sook Choi
Green tea (GT) has various health effects, including anti-obesity properties. However, the multiple molecular mechanisms of the effects have not been fully determined. The aim of this study was to elucidate the anti-obesity effects of GT via the analysis of its metabolic and transcriptional responses based on RNA-seq profiles. C57BL/6J mice were fed a normal, high-fat (60% energy as fat), or high-fat + 0.25% (w/w) GT diet for 12 weeks. The GT extract ameliorated obesity, hepatic steatosis, dyslipidemia, and insulin resistance in diet-induced obesity (DIO) mice...
October 14, 2016: Nutrients
Teeradate Kongpichitchoke, Ming-Tzu Chiu, Tzou-Chi Huang, Jue-Liang Hsu
Teas can be classified according to their degree of fermentation, which has been reported to affect both the bioactive components in the teas and their antioxidative activity. In this study, four kinds of commercial Taiwanese tea at different degrees of fermentation, which include green (non-fermented), oolong (semi-fermented), black (fully fermented), and Pu-erh (post-fermented) tea, were profiled for catechin levels by using high performance liquid chromatography (HPLC). The result indicated that the gallic acid content in tea was directly proportional to the degree of fermentation in which the lowest and highest gallic acid content were 1...
October 12, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Xiran He, Bo Gao, Lei Zhou, Sidong Xiong
Viral myocarditis, which is mainly caused by coxsackievirus B3 (CVB3), affects about 5%-20% of the world population and still lacks efficient treatments. Green tea, a tonic and healthful beverage that was originated in ancient China, has been receiving considerable attention for its protective effect on cardiovascular diseases in recent years. In present investigation, we aimed to explore the effect of Green tea polyphenol epigallocatechin-3-gallate (EGCG) on CVB3-induced myocarditis and its underlying mechanism...
October 6, 2016: Journal of Cardiovascular Pharmacology
Amani F Abaza, Osama N Mohamed, Fathy K El-Fiky, Khaled A Ahmed
OBJECTIVES: This study aimed to determine the occurrence of methicillin-resistant Staphylococcus aureus (MRSA) nasal carriage among patients, healthcare workers (HCWs), and community individuals, as well as to test the effect of tea extracts on detected S. aureus isolates. MATERIALS AND METHODS: This cross-sectional study that was followed by an experimental study included a total of 1021 nasal swab samples that were collected from 470 community cases, 191 HCWs, and 360 patients...
September 2016: Journal of the Egyptian Public Health Association
Maria Campos, C Batista, N R Jesus, C M Silva, T P Silva
Cardiovascular patients frequently use herbal medicinal products, in order to contribute to the improvement of their chronic condition without medical intervention. However, they are likely to suffer from adverse effects from natural products and herb-drug interactions. This work aimed to alert cardiovascular patients and healthcare providers of the potential of occurrence of herb-drug interactions with cardiovascular therapy. Information obtained from the campaign "Aprender Saúde Entre as Plantas e os Medicamentos", carried out by the Observatory of Herb-Drug Interactions (www...
October 7, 2016: Cardiovascular & Hematological Agents in Medicinal Chemistry
Ilaria Peluso, Mauro Serafini
Consumption of Tea (Camellia Sinensis) has been correlated with low incidence of chronic pathologies, such as cardiovascular diseases and cancers, in which oxidative stress is deeply involved. Tea catechins and theaflavins are, respectively, the bioactive phytochemicals responsible for the antioxidant activity of Green Tea (GT) and Black Tea (BT). Apart from the redox properties, tea catechins and theaflavins could have also pharmacological activities, such as lowering effects on glucose, lipid and uric acid (UA)...
October 16, 2016: British Journal of Pharmacology
J Anand, N Rai
The present investigation aims at evaluating synergistic herbal based composition of purified catechins with fluconazole, amphotericin B and copper sulphate against Candida albicans (MTCC 3017) and Candida glabrata (MTCC 3019). The catechins were isolated from green tea leaves of Assam, Himachal Pradesh and Uttarakhand regions of India. The synergistic activity of combinations against Candida species was assessed following microdilution checkerboard technique and time kill assay. The inhibitory action of most significant combination on treated Candida cells was assessed by scanning electron microscopy...
October 12, 2016: Journal de Mycologie Médicale
Amir Hadi, Makan Pourmasoumi, Marzieh Kafeshani, Jahangir Karimian, Mohammad Reza Maracy, Mohammad Hasan Entezari
OBJECTIVE: Additional oxygen consumption during intense exercises may lead to oxidative stress and contribute to muscular fatigue. Green tea and sour tea (Hibiscus sabdariffa L.), which contain various flavonoids and polyphenols, have many healthful properties such as anticarcinogenic, anti-inflammatory, and heart protecting effects. The aim of the present study was to assess the effects of green tea and sour tea supplementation on oxidative stress and muscle damage in soccer athletes...
October 13, 2016: Journal of Dietary Supplements
Maheswata Sahoo, Lingaraja Jena, Surya Narayan Rath, Satish Kumar
The influenza A (H1N1) virus, also known as swine flu is a leading cause of morbidity and mortality since 2009. There is a need to explore novel anti-viral drugs for overcoming the epidemics. Traditionally, different plant extracts of garlic, ginger, kalmegh, ajwain, green tea, turmeric, menthe, tulsi, etc. have been used as hopeful source of prevention and treatment of human influenza. The H1N1 virus contains an important glycoprotein, known as neuraminidase (NA) that is mainly responsible for initiation of viral infection and is essential for the life cycle of H1N1...
September 2016: Genomics & Informatics
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