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Camellia sinensis

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https://www.readbyqxmd.com/read/29342935/exogenous-melatonin-alleviates-cold-stress-by-promoting-antioxidant-defense-and-redox-homeostasis-in-camellia-sinensis-l
#1
Xin Li, Ji-Peng Wei, Eric R Scott, Jian-Wei Liu, Shuai Guo, Yang Li, Lan Zhang, Wen-Yan Han
The unprecedented early spring frost that appears as a cold stress adversely affects growth and productivity in tea (Camellia sinensis L.); therefore, it is indispensable to develop approaches to improve the cold tolerance of tea. Here, we investigated the effect of pretreatment with exogenous melatonin on the net photosynthetic rate, the maximum photochemical efficiency of PSII, chlorophyll content, lipid peroxidation, reactive oxygen species (ROS) accumulation, antioxidant potential, and redox homeostasis in leaves of tea plants following cold stress...
January 15, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29340014/cymbopogon-citratus-and-camellia-sinensis-extracts-selectively-induce-apoptosis-in-cancer-cells-and-reduce-growth-of-lymphoma-xenografts-in-vivo
#2
Cory Philion, Dennis Ma, Ivan Ruvinov, Fadi Mansour, Christopher Pignanelli, Megan Noel, Ammar Saleem, John Arnason, Mark Rodrigues, Inderpal Singh, Jesse Ropat, Siyaram Pandey
Cancer cells are reported to have elevated levels of reactive oxygen species (ROS) and are highly dependent on cellular defense mechanisms against oxidative stress. Numerous nutraceuticals and natural polyphenolic compounds have a wide range of abilities to alter cellular redox states with potential implications in various diseases. Furthermore, therapeutic options for cancers are mostly nonselective treatments including genotoxic or tubulin-targeting compounds. Some of the natural extracts, containing multiple bioactive compounds, could target multiple pathways in cancer cells to selectively induce cell death...
December 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/29337349/phytochemicals-anti-inflammatory-antiproliferative-and-methylglyoxal-trapping-properties-of-zijuan-tea
#3
Xiong Gao, Chi-Tang Ho, Xiaofei Li, Xiaorong Lin, Yuanyuan Zhang, Zhongzheng Chen, Bin Li
Zijuan tea (Camellia sinensis var. assamica) is a unique anthocyanin-rich tea cultivar in China. Although chemical component analysis of Zijuan tea and extraction technology of anthocyanins was widely documented, its functional properties have not been extensively explored. In this study, the anti-inflammatory, antiproliferative, and methylglyoxal (MGO) trapping activities of water extract (ZWE) and ethyl acetate extract (ZEE) of Zijuan tea were investigated for the 1st time. Results showed that ZWE and ZEE exhibited inhibitory effects on nitric oxide (NO), tumor necrosis factor (TNF)-α, and interleukin (IL)-6 production as well as inducible nitric oxide synthase protein (iNOS) expression in lipopolysaccharide (LPS)-induced RAW 264...
January 16, 2018: Journal of Food Science
https://www.readbyqxmd.com/read/29332333/epigallocatechin-gallate-from-green-tea-exhibits-potent-anticancer-effects-in-a-549-non-small-lung-cancer-cells-by-inducing-apoptosis-cell-cycle-arrest-and-inhibition-of-cell-migration
#4
Jie Huang, Shi Chen, Yi Shi, Cheng-Hong Li, Xiao-Jiang Wang, Fa-Jiu Li, Chuan-Hai Wang, Qing-Hua Meng, Jin-Nan Zhong, Min Liu, Zi-Ming Wang
PURPOSE: Green tea (Camellia sinensis) is considered as a rich source of epigallocatechin gallate (EGCG) which has been shown to exert impressive pharmacological properties. The anticancer properties of EGCG have been extensively studied however, its anticancer activity has not been explored in lung cancer. The present study was therefore designed to evaluate the anticancer effects of EGCG against non-small cell lung cancer (NSCLC) cell line A-549 and normal human fibroblast FR-2 cells...
November 2017: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
https://www.readbyqxmd.com/read/29317677/isolation-and-characterization-of-key-genes-that-promote-flavonoid-accumulation-in-purple-leaf-tea-camellia-sinensis-l
#5
Xiujuan He, Xuecheng Zhao, Liping Gao, Xingxing Shi, Xinlong Dai, Yajun Liu, Tao Xia, Yunsheng Wang
There were several high concentrations of flavonoid components in tea leaves that present health benefits. A novel purple-leaf tea variety, 'Mooma1', was obtained from the natural hybrid population of Longjing 43 variety. The buds and young leaves of 'Mooma1' were displayed in bright red. HPLC and LC-MS analysis showed that anthocyanins and O-Glycosylated flavonols were remarkably accumulated in the leaves of 'Mooma1', while the total amount of catechins in purple-leaf leaves was slightly decreased compared with the control...
January 9, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29310849/fat-burner-induced-acute-liver-injury-case-series-of-four-patients
#6
Aleksandar Gavrić, Marija Ribnikar, Lojze Šmid, Boštjan Luzar, Borut Štabuc
Dietary supplements known as "fat burners" are typically marketed with claims of increasing energy expenditure through alterations in fat metabolism. They are marketed as natural products and their use is thus perceived as a safe body weight reduction strategy. We report on five episodes of liver injury in four patients. Liver injury was associated with consumption of different commercially available fat burners: Green tea extract (Camellia sinensis), Garcinia gummi-gutta, green coffee beans, and spirulina (blue-green algae)...
November 6, 2017: Nutrition
https://www.readbyqxmd.com/read/29280418/comparative-effect-of-camellia-sinensis-teas-on-object-recognition-test-deficit-and-metabolic-changes-induced-by-cafeteria-diet
#7
Melina Bucco Soares, Juliana Bernera Ramalho, Aryele Pinto Izaguirry, Natasha Frasson Pavin, Cristiano Chiapinotto Spiazzi, Helen Lidiane Schimidt, Pâmela Billig Mello-Carpes, Francielli Weber Santos
OBJECTIVES: Consumption of high-fat and high-sugar diets in Western countries has increased significantly causing major global health problems including metabolic syndrome and obesity. In addition, studies have suggested that obesity can lead to learning and memory deficits. In this context, the use of natural compounds with low costs, minor side effects and increased antioxidant activity, such as teas, could reduce the damages induced by obesity. We investigated the effect of white, green, red, and black teas (Camellia sinensis) and their possible neuroprotective mechanisms in an experimental obesity model induced by a cafeteria diet (CD)...
December 27, 2017: Nutritional Neuroscience
https://www.readbyqxmd.com/read/29276385/green-synthesis-palladium-nanoparticles-mediated-by-white-tea-camellia-sinensis-extract-with-antioxidant-antibacterial-and-antiproliferative-activities-toward-the-human-leukemia-molt-4-cell-line
#8
Susan Azizi, Mahnaz Mahdavi Shahri, Heshu Sulaiman Rahman, Raha Abdul Rahim, Abdullah Rasedee, Rosfarizan Mohamad
Among nanoparticles used for medical applications, palladium nanoparticles (PdNPs) are among the least investigated. This study was undertaken to develop PdNPs by green synthesis using white tea (W.tea; Camellia sinensis) extract to produce the Pd@W.tea NPs. The Pd@W.tea NPs were characterized by UV-vis spectroscopy and X-ray diffractometry, and evaluated with transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The Pd@W.tea NPs were spherical (size 6-18 nm) and contained phenols and flavonoids acquired from the W...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29245515/two-new-species-of-i-mycterothrips-i-thysanoptera-thripidae-from-southwestern-china
#9
Yajin Li, Zhengyue Li, Hongrui Zhang
Mycterothrips gongshanensis sp.n. and M. yelangi sp.n. are described from Southwestern China. Both species have been collected from tea (Camellia sinensis), and M. gongshanensis sp.n. is a potential pest in tea gardens. An identification key is provided to the Mycterothrips species recorded from China.
November 23, 2017: Zootaxa
https://www.readbyqxmd.com/read/29244739/metabolic-characterization-of-the-anthocyanidin-reductase-pathway-involved-in-the-biosynthesis-of-flavan-3-ols-in-elite-shuchazao-tea-camellia-sinensis-cultivar-in-the-field
#10
Lei Zhao, Xiao-Lan Jiang, Yu-Mei Qian, Pei-Qiang Wang, De-Yu Xie, Li-Ping Gao, Tao Xia
Anthocyanidin reductase (ANR) is a key enzyme in the ANR biosynthetic pathway of flavan-3-ols and proanthocyanidins (PAs) in plants. Herein, we report characterization of the ANR pathway of flavan-3-ols in Shuchazao tea (Camellia sinesis), which is an elite and widely grown cultivar in China and is rich in flavan-3-ols providing with high nutritional value to human health. In our study, metabolic profiling was preformed to identify two conjugates and four aglycones of flavan-3-ols: (-)-epigallocatechin-gallate [(-)-EGCG], (-)-epicatechin-gallate [(-)-ECG], (-)-epigallocatechin [(-)-EGC], (-)-epicatechin [(-)-EC], (+)-catechin [(+)-Ca], and (+)-gallocatechin [(+)-GC], of which (-)-EGCG, (-)-ECG, (-)-EGC, and (-)-EC accounted for 70-85% of total flavan-3-ols in different tissues...
December 15, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29227650/molecular-evidence-for-catechin-synthesis-and-accumulation-in-tea-buds-camellia-sinensis
#11
Xinzhen Wang, Lina Guo, Liping Gao, Xingxing Shi, Xuecheng Zhao, Xiubing Ma, Tao Xia, Yunsheng Wang
Early spring buds of the Camellia sinensis variety Shuchazao were separated into two parts, including the shoot tip (ST) and non-expanded young leaves (YL). Then, the synthesis and accumulation of catechins in the two parts were assessed by HPLC, DMACA staining, qRT-PCR and in situ hybridization. HPLC showed that EGCG and ECG amounts in YL were increased significantly by 74.0% and 71.8%, respectively. The results of DMACA staining indicated that catechins in buds accumulated mainly in mesophyll cells and bud shaft of YL...
December 11, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29225315/comparison-of-the-effects-of-three-tea-cultivars-camellia-sinensis-l-on-nitric-oxide-production-and-aortic-soluble-guanylate-cyclase-expression-in-high-salt-diet-fed-spontaneously-hypertensive-rats
#12
Sachiko Nomura, Manami Monobe, Kaori Ema, Mari Maeda-Yamamoto, Atsushi Nesumi
Studies have suggested that the consumption of green tea reduces the risk of cardiovascular diseases. Although epigallocatechin gallate (EGCG) is the best studied active substance characteristic of green tea, previous results on EGCG do not appear sufficient to explain completely the mechanism of cardiovascular protection by green tea. Therefore, we investigated the effect of three different tea cultivars, "Yabukita," "Sofu," and "Sunrouge," which have characteristic flavonoid compositions, on the nitric oxide (NO) production and the related protein expression in the aorta of spontaneously hypertensive rats (SHRs) fed a high-salt diet...
2017: Journal of Nutritional Science and Vitaminology
https://www.readbyqxmd.com/read/29211766/comparative-analysis-of-the-response-and-gene-regulation-in-cold-resistant-and-susceptible-tea-plants
#13
Qiuyan Ban, Xuewen Wang, Cheng Pan, Yiwei Wang, Lei Kong, Huiguang Jiang, Yiqun Xu, Wenzhi Wang, Yuting Pan, Yeyun Li, Changjun Jiang
Cold environment is the main constraint for tea plants (Camellia sinensis) distribution and tea farming. We identified two tea cultivars, called var. sinensis cv. Shuchazao (SCZ) with a high cold-tolerance and var. assamica cv. Yinghong9 (YH9) with low cold-tolerance. To better understand the response mechanism of tea plants under cold stress for improving breeding, we compared physiological and biochemical responses, and associated genes expression in response to 7-day and 14-day cold acclimation, followed by 7-day de-acclimation in these two tea cultivars...
2017: PloS One
https://www.readbyqxmd.com/read/29207823/an-in-vitro-study-to-compare-the-effect-of-different-types-of-tea-with-chlorhexidine-on-streptococcusmutans
#14
Dona Elizabeth George, Roshan Shetty, Pooja J Shetty, Leslie Allan Gomes
Introduction: Tea is the second most commonly consumed beverage in the world after water. The leaf and bud of the plant Camellia sinensis produces tea. The different forms of tea are 'non-fermented' green tea, 'semi-fermented' oolong tea and 'fermented' black tea according to the manufacturing process. Streptococcus mutans is the main causative organism in dental caries and plaque formation. Aim: The present study was undertaken to determine the antibacterial effectiveness of aqueous and ethanol extracts of green tea, black tea and oolong tea against S...
September 2017: Journal of Clinical and Diagnostic Research: JCDR
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/29197749/radiocesium-uptake-through-leaf-surfaces-of-tea-plants-camellia-sinensis-l
#16
Takashi Ikka, Yoshifumi Nishina, Mizuho Kamoshita, Yasuhisa Oya, Kenji Okuno, Akio Morita
To clarify the source of radiocesium detected in newly emerged tea leaves contaminated just before the time of bud opening by fallout of radionuclides from Fukushima Dai-ichi Nuclear Power Plant, 137CsCl solution (0.185 M Bq mL-1) was applied to the front or the backside surfaces of mature leaves of tea plant (Camellia sinensis L. cv. Yabukita) at the time of bud opening. A 21 days after foliar application, the buds had grown and developed to the three- or four-leaf stage. In the front treatment, almost all (95%) of the applied 137Cs was present in the mature leaves (hot mother leaves)...
November 30, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29195939/profiling-and-quantification-of-phenolic-compounds-in-camellia-seed-oils-natural-tea-polyphenols-in-vegetable-oil
#17
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/29188400/cellular-injury-to-1-to-3-year-old-stems-of-camellia-sinensis-by-tuckerella-japonica
#18
Diann S Achor, Carl C Childers, Michael E Rogers
Tuckerella japonica Ehara (Acari: Tuckerellidae) feeds on predigested plant cells beneath exposed periderm tissue of 1- to 3+-year-old stems of Camellia sinensis (L.) O. Kuntze (Theaceae) where longitudinal bark splitting occurs. Control samples from these tissues were compared with areas fed upon by T. japonica adults and immatures to characterize types of cellular injury. Stylet diameters ranged from 1.6 to 2.3 µm and were consistent with observed stylet punctures in the stems. Mite saliva was injected along tracts within the cortical tissue and resulted in cell wall disruption, collapsed cells and, in older tissue, hyperplasia...
November 29, 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/29188046/influence-of-particle-size-and-extraction-solvent-on-antioxidant-properties-of-extracts-of-tea-ginger-and-tea-ginger-blend
#19
Solomon A Makanjuola
The influence of particle size and extraction solvent on the antioxidant properties of aqueous and ethanolic extracts of tea (Camellia sinensis), ginger (Zingiber officinale), and tea-ginger (2:1) blend was investigated. The powder sizes studied were 0.425, 0.710, and 1.180 mm. Extracts were analyzed for DPPH radical scavenging activity, ABTS radical scavenging activity, total phenol content (TPC), iron chelating activity, total flavonoid content, and peroxide scavenging activity. The powder with the lowest particle size of 0...
November 2017: Food Science & Nutrition
https://www.readbyqxmd.com/read/29178904/nutritional-supplements-and-herbal-medicines-for-women-with-polycystic-ovary-syndrome-a-systematic-review-and-meta-analysis
#20
REVIEW
Susan Arentz, Caroline A Smith, Jason Abbott, Alan Bensoussan
BACKGROUND: Polycystic ovary syndrome (PCOS) is a common, reproductive endocrinopathy associated with serious short and long term health risks. Many women with PCOS use ingestible complementary medicines. This systematic review examined the effect on menstrual regulation and adverse effects from randomised controlled trials. METHODS: Randomised controlled trials (RCTs) that compared herbal or nutritional supplements to placebo or active controls in women with PCOS were eligible for inclusion...
November 25, 2017: BMC Complementary and Alternative Medicine
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