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Tea polyphenols

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https://www.readbyqxmd.com/read/29329838/effect-of-extraction-methods-on-the-chemical-components-and-taste-quality-of-green-tea-extract
#1
Yong-Quan Xu, Wei-Bin Ji, Peigen Yu, Jian-Xin Chen, Fang Wang, Jun-Feng Yin
The physicochemical properties of tea extracts are significantly affected by the extraction method. The aim of this study was to compare the effects of static and dynamic extractions on the concentrations of chemical components and taste quality of green tea extracts. Our results show that extraction of chemical components using static extraction follows a pseudo-second-order reaction, while that of dynamic extraction follows a first-order reaction. The concentrations of the solids, polyphenols, and free amino acids in green tea extract prepared by dynamic extraction were much higher, although the overall yields were not significantly different between the two extraction methods...
May 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29329833/effect-of-brewing-time-and-temperature-on-antioxidant-capacity-and-phenols-of-white-tea-relationship-with-sensory-properties
#2
S Pérez-Burillo, R Giménez, J A Rufián-Henares, S Pastoriza
White tea is highly consumed due to its sensory properties and health benefits, although most scientific reports don't include the analysis of both properties. Therefore, the objective of the present study was to unravel the best brewing conditions for optimal extraction of the bioactive compounds and antioxidant capacity, while realising the best sensory properties. Infusions of eighty commercial teas (sold in bags or leaves) were obtained at different time-temperature ratios, studying bioactive compounds (caffeine and individual catechins), antioxidant capacity and sensory analysis...
May 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29316635/skin-protective-effect-of-epigallocatechin-gallate
#3
Eunji Kim, Kyeonghwan Hwang, Jongsung Lee, Sang Yun Han, Eun-Mi Kim, Junseong Park, Jae Youl Cho
Epigallocatechin gallate (EGCG) is a catechin and an abundant polyphenol in green tea. Although several papers have evaluated EGCG as a cosmetic constituent, the skin hydration effect of EGCG is poorly understood. We aimed to investigate the mechanism by which EGCG promotes skin hydration by measuring hyaluronic acid synthase (HAS) and hyaluronidase (HYAL) gene expression and antioxidant and anti-pigmentation properties using cell proliferation assay, Western blotting analysis, luciferase assay, 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, and reverse transcription polymerase chain reaction (RT-PCR) analysis...
January 6, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29313749/the-potential-effects-of-caffeinated-beverages-on-insulin-sensitivity
#4
E Paul Cherniack, Natalie Buslach, Heather F Lee
Caffeinated beverages, most commonly tea and coffee, may have important effects on insulin regulation that may give their consumption an important role among nutritional factors in the development of diseases of glucose and insulin metabolism, such as diabetes and atherosclerotic vascular diseases. These beverages include compounds that may have contradictory effects on insulin and glucose: Caffeine impairs insulin sensitivity, but polyphenolic molecules within tea, coffee, and cocoa augment the effects of insulin...
January 9, 2018: Journal of the American College of Nutrition
https://www.readbyqxmd.com/read/29301398/poly-para-phenyleneethynylene-sensor-arrays-discriminate-22-different-teas
#5
Benhua Wang, Jinsong Han, Markus Bender, Sebastian Hahn, Kai Seehafer, Uwe H F Bunz
Two nine-element sensor arrays, consisting of either three cationic poly(para-phenylene-ethynylene)s (PPE) or the same PPEs complexed by cucurbituril[8] (CB[8]) at pH 3, 7 and 13 in water, discriminate 22 different teas and some of their small molecule components, including caffeine, theobromine and theophylline. Both arrays distinguish all of the black, green and oolong teas. The discrimination occurs by differential fluorescence modulation of the components of the sensor array and the treatment of the collected data by linear discriminant analysis...
January 5, 2018: ACS Sensors
https://www.readbyqxmd.com/read/29301278/theaflavin-3-3-digallate-enhances-the-inhibitory-effect-of-cisplatin-by-regulating-the-copper-transporter-1-and-glutathione-in-human-ovarian-cancer-cells
#6
Haibo Pan, Eunhye Kim, Gary O Rankin, Yon Rojanasakul, Youying Tu, Yi Charlie Chen
Ovarian cancer has the highest fatality rate among the gynecologic cancers. The side effects, high relapse rate, and drug resistance lead to low long-term survival rate (less than 40%) of patients with advanced ovarian cancer. Theaflavin-3,3'-digallate (TF3), a black tea polyphenol, showed less cytotoxicity to normal ovarian cells than ovarian cancer cells. We aimed to investigate whether TF3 could potentiate the inhibitory effect of cisplatin against human ovarian cancer cell lines. In the present study, combined treatment with TF3 and cisplatin showed a synergistic cytotoxicity against A2780/CP70 and OVCAR3 cells...
January 2, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29287451/simplified-recovery-of-enzymes-and-nutrients-in-sweet-potato-wastewater-and-preparing-health-black-tea-and-theaflavins-with-scrap-tea
#7
Qing-Rong Li, Jia-Ling Luo, Zhong-Hua Zhou, Guang-Ying Wang, Rui Chen, Shi Cheng, Min Wu, Hui Li, He Ni, Hai-Hang Li
The industry discards generous organic wastewater in sweet potato starch factory and scrap tea in tea production. A simplified procedure to recover all biochemicals from the wastewater of sweet potato starch factory and use them to make health black tea and theaflavins from scrap green tea was developed. The sweet potato wastewater was sequentially treated by isoelectric precipitation, ultrafiltration and nanofiltration to recover polyphenol oxidase (PPO), β-amylase, and small molecular fractions, respectively...
April 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29278293/green-tea-polyphenol-egcg-alleviates-metabolic-abnormality-and-fatty-liver-by-decreasing-bile-acid-and-lipid-absorption-in-mice
#8
Jinbao Huang, Simin Feng, Anna Liu, Zhuqing Dai, Hong Wang, Kenneth Reuhl, Wenyun Lu, Chung S Yang
SCOPE: The tea polyphenol (-)-epigallocatechin-3-gallate (EGCG) has been shown to ameliorate metabolic abnormalities and fatty liver. The present study investigated the mechanisms of actions of EGCG on bile acid homeostasis and lipid metabolism. METHODS: Male C57BL/6J mice were fed a low-fat diet, a high-fat western-style diet or a high-fat western-style diet containing 0.32% EGCG. The effects of the treatments on biochemical parameters, gene expression and lipidomics were analyzed...
December 26, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/29230104/metformin-sensitizes-non-small-cell-lung-cancer-cells-to-an-epigallocatechin-3-gallate-egcg-treatment-by-suppressing-the-nrf2-ho-1-signaling-pathway
#9
Chenxiao Yu, Yang Jiao, Jiao Xue, Qi Zhang, Hongying Yang, Ligang Xing, Guangxia Chen, Jinchang Wu, Shuyu Zhang, Wei Zhu, Jianping Cao
Non-small cell lung cancer (NSCLC) is the most common type of lung cancer. (-)-Epigallocatechin-3-gallate (EGCG), a major polyphenol in green tea, is widely studied as a cancer chemopreventive agent with potential anti-cancer effects. The NF-E2-related factor 2 (Nrf2)/heme oxygenase-1 (HO-1) signaling pathway is considered to mediate cellular resistance to EGCG. Metformin, a classical antidiabetic drug, has been shown to prevent cancer progression. Researchers have not reported whether metformin potentiates the anti-cancer efficacy of EGCG...
2017: International Journal of Biological Sciences
https://www.readbyqxmd.com/read/29223753/preparation-and-characterization-of-biocomposite-film-based-on-chitosan-and-kombucha-tea-as-active-food-packaging
#10
Azam Ashrafi, Maryam Jokar, Abdorreza Mohammadi Nafchi
An active film composed of chitosan and kombucha tea (KT) was successfully prepared using the solvent casting technique. The effect of incorporation of KT at the levels 1%-3% w/w on the physical and functional properties of chitosan film was investigated. The antimicrobial activity of chitosan/KT film against Escherichia coli and Staphylococcus aureus was evaluated using agar diffusion test, and its antioxidant activity was determined using DPpH assay. The results revealed that incorporation of KT into chitosan films improved the water vapor permeability (from 256...
December 6, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29216948/-tea-polyphenols-down-regulate-jnk-phosphorylation-to-inhibit-neuron-apoptosis-in-rats-with-cardiac-arrest
#11
Yumei Liu, Thi Phuong Anh Nguyen, Menghua Chen, Lu Xie
OBJECTIVE: To study the effect of tea polyphenols (TP) on c-Jun N-terminal kinase 1/2 (JNK1/2) phosphorylation and cell apoptosis in brain tissues in rats with cardiac arrest (CA) following cardiopulmonary resuscitation (CPR). METHODS: Healthy male Sprague-Dawley (SD) rats were randomly divided into sham group (n = 6), CA group (n = 12), and TP group (n = 12). The rats in CA and TP groups were induced ventricular fibrillation (VF) via esophagus stimulation with alternating current...
December 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/29209211/diabetes-mellitus-and-alzheimer-s-disease-the-protection-of-epigallocatechin-3-gallate-in-streptozotocin-injection-induced-models
#12
REVIEW
Jin-Jing Jia, Xian-Si Zeng, Xin-Qiang Song, Peng-Peng Zhang, Lei Chen
Diabetes mellitus is considered as a risk factor of Alzheimer's disease (AD), the front runner of neurodegenerative disorders. Streptozotocin (STZ) is a toxin for pancreatic β-cell, which can construct a model of insulin deficient diabetes through intraperitoneal or intravenous injection. A model generated by intracerebroventricular STZ (icv-STZ) also shows numerous aspects of sporadic AD. The protective roles of tea polyphenols epigallocatechin-3-gallate (EGCG) on both two diseases were researched by some scientists...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29207033/epigallocatechin-3-gallate-inhibits-inflammation-and-epithelial%C3%A2-mesenchymal-transition-through-the-pi3k-akt-pathway-via-upregulation-of-pten-in-asthma
#13
Nan Yang, Han Zhang, Xuxu Cai, Yunxiao Shang
Asthma is a chronic disease associated with hyperresponsiveness, obstruction and remodeling of the airways. Epithelial-mesenchymal transition (EMT) has an important role in these alterations and may account for the accumulation of subepithelial mesenchymal cells, thus contributing to airway hyperresponsiveness and remodeling. Epigallo-catechin‑3‑gallate (EGCG), which is a type of polyphenol, is the most potent ingredient in green tea, and exhibits antibacterial, antiviral, antioxidative, anticancer and chemopreventive activities...
November 28, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29206164/dietary-consumption-of-phenolic-acids-and-prostate-cancer-a-case-control-study-in-sicily-southern-italy
#14
Giorgio Ivan Russo, Daniele Campisi, Marina Di Mauro, Federica Regis, Giulio Reale, Marina Marranzano, Rosalia Ragusa, Tatiana Solinas, Massimo Madonia, Sebastiano Cimino, Giuseppe Morgia
Dietary polyphenols gained the interest of the scientific community due to their wide content in a variety of plant-derived foods and beverages commonly consumed, such as fruits, vegetables, coffee, tea, and cocoa. We aimed to investigate whether there was an association between dietary phenolic acid consumption and prostate cancer (PCa) in South Italy. We conducted a population-based case-control study from January 2015 to December 2016 in a single institution of the municipality of Catania, southern Italy (Registration number: 41/2015)...
December 5, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29201056/development-of-a-rapid-and-simple-method-to-remove-polyphenols-from-plant-extracts
#15
Imali Ranatunge, Subshini Adikary, Piumi Dasanayake, Chamira Dilanka Fernando, Preethi Soysa
Polyphenols are secondary metabolites of plants, which are responsible for prevention of many diseases. Polyvinylpolypyrrolidone (PVPP) has a high affinity towards polyphenols. This method involves the use of PVPP column to remove polyphenols under centrifugal force. Standards of gallic acid, epigallocatechin gallate, vanillin, and tea extracts (Camellia sinensis) were used in this study. PVPP powder was packed in a syringe with different quantities. The test samples were layered over the PVPP column and subjected to centrifugation...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29200719/anti-cancer-effects-of-polyphenolic-compounds-in-epidermal-growth-factor-receptor-tyrosine-kinase-inhibitor-resistant-non-small-cell-lung-cancer
#16
Hyungmin Jeong, Ai N H Phan, Jong-Whan Choi
Background: Polyphenolic phytochemicals are natural compounds, easily found in fruits and vegetables. Importantly, polyphenols have been intensively studied as excellent antioxidant activity which contributes to anticancer function of the natural compounds. Lung cancer has been reported to mainly account for cancer-related deaths in the world. Moreover, epidermal growth factor receptor tyrosine kinase inhibitor (TKI) resistance is one of the biggest issues in cancer treatment, especially in nonsmall cell lung cancer (NSCLC)...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29199574/immunoreactivity-of-the-cold-water-extract-of-royal-sun-culinary-medicinal-mushroom-agaricus-brasiliensis-strain-ka21-agaricomycetes-assessed-by-immunoglobulin-preparations-for-intravenous-injection
#17
Katsuya Tajima, Masuro Motoi, Akitomo Motoi, Daisuke Yamanaka, Ken-Ichi Ishibashi, Yoshiyuki Adachi, Naohito Ohno
The royal sun medicinal mushroom, Agaricus brasiliensis, is a health food material that helps to improve quality of life. A. brasiliensis has long been used as a tea by extraction with cold and hot water. Our group has been investigating the immunopharmacological activities of the A. brasiliensis KA21 strain, which is cultivated outdoors. We prepared cold water (AgCWE) and hot water (AgHWE) extracts of this strain. AgCWE contained a larger proportion of proteins, including enzymes, and showed a brownish color during the extraction process...
2017: International Journal of Medicinal Mushrooms
https://www.readbyqxmd.com/read/29195939/profiling-and-quantification-of-phenolic-compounds-in-camellia-seed-oils-natural-tea-polyphenols-in-vegetable-oil
#18
Xiaoqin Wang, Qiumei Zeng, María Del Mar Contreras, Lijuan Wang
In Asia, tea seed oils (seed oils from Camellia oleifera, C. chekiangoleosa, and C. sinensis) are used in edible, medicinal, and cosmetic applications. However, these oils differ in their fatty acid contents, and there is little known about their phenolic compounds. Here we analyzed the phenolic compounds of seed oils from three species gathered from 15 regions of China. Twenty-four phenolic compounds were characterized by HPLC-Q-TOF-MS, including benzoic acids (6), cinnamic acids (6), a hydroxyphenylacetic acid, flavanols (4), flavonols (3), flavones (2), and dihydroflavonoids (2)...
December 2017: Food Research International
https://www.readbyqxmd.com/read/29194424/functional-foods-and-lifestyle-approaches-for-diabetes-prevention-and-management
#19
REVIEW
Ahmad Alkhatib, Catherine Tsang, Ali Tiss, Theeshan Bahorun, Hossein Arefanian, Roula Barake, Abdelkrim Khadir, Jaakko Tuomilehto
Functional foods contain biologically active ingredients associated with physiological health benefits for preventing and managing chronic diseases, such as type 2 diabetes mellitus (T2DM). A regular consumption of functional foods may be associated with enhanced anti-oxidant, anti-inflammatory, insulin sensitivity, and anti-cholesterol functions, which are considered integral to prevent and manage T2DM. Components of the Mediterranean diet (MD)-such as fruits, vegetables, oily fish, olive oil, and tree nuts-serve as a model for functional foods based on their natural contents of nutraceuticals, including polyphenols, terpenoids, flavonoids, alkaloids, sterols, pigments, and unsaturated fatty acids...
December 1, 2017: Nutrients
https://www.readbyqxmd.com/read/29193405/epigallocatechin-3-gallate-enhances-differentiation-of-acute-promyelocytic-leukemia-cells-via-inhibition-of-pml-rar%C3%AE-and-hdac1
#20
Maliheh Moradzadeh, Abazar Roustazadeh, Alijan Tabarraei, Saiedeh Erfanian, Amirhossein Sahebkar
The use of all-trans retinoic acid (ATRA) has dramatically improved the treatment and survival rate of patients with acute promyelocytic leukemia (APL). However, toxicity and resistance to this drug are major problems in the treatment of APL with ATRA. Earlier studies have suggested that the green tea polyphenol epigallocatechin gallate (EGCG) induces cell death in hematopoietic neoplasms without adversely affecting normal cells. In the present study, the potential therapeutic effect of EGCG in APL and the underlying molecular mechanisms were investigated...
November 29, 2017: Phytotherapy Research: PTR
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