keyword
MENU ▼
Read by QxMD icon Read
search

Dark tea

keyword
https://www.readbyqxmd.com/read/29090295/neuroprotective-action-of-tea-polyphenols-on-oxidative-stress-induced-apoptosis-through-the-activation-of-the-trkb-creb-bdnf-pathway-and-keap1-nrf2-signaling-pathway-in-sh-sy5y-cells-and-mice-brain
#1
Guoyuan Qi, Yashi Mi, Yiwen Wang, Runnan Li, Shuxian Huang, Xingyu Li, Xuebo Liu
Many studies have shown that oxidative stress is a major cause of cellular injuries in a variety of human diseases including cognitive impairment. Tea polyphenols (TPs), natural plant flavonoids found in tea plant leaves, possess the bioactivity to affect the pathogenesis of several chronic diseases via antioxidant associated mechanisms. However, the possible antioxidant and neuroprotective properties of TPs in the brain of mice housed in constant darkness and in H2O2-stimulated SH-SY5Y cells are yet to be elucidated...
November 1, 2017: Food & Function
https://www.readbyqxmd.com/read/28964372/phytochemical-profiles-and-antioxidant-activities-of-chinese-dark-teas-obtained-by-different-processing-technologies
#2
Hai-Peng Lv, Yue Zhang, Jiang Shi, Zhi Lin
Dark teas are rich in secondary metabolites, such as phenolics and flavonoids, which have been suggested to be associated with their health benefits. In this study, the concentrations of tea polyphenols, tea pigments, catechins, flavonoids, alkaloid, and volatile components in 44 dark tea samples, including Pu-erh, Fuzhuan and Liubao teas, were systematically examined. Among the samples tested, Pu-erh tea contained the highest total flavonoid content (5.24±0.05%), followed by Liubao (4.45±0.61%) and Fuzhuan teas (3...
October 2017: Food Research International
https://www.readbyqxmd.com/read/28935146/effect-of-chocolate-and-mate-tea-on-the-lipid-profile-of-individuals-with-hiv-aids-on-antiretroviral-therapy-a-clinical-trial
#3
Suelen J Souza, Aline A Petrilli, Andrea M Teixeira, Patricia M Pontilho, Antonio A Carioca, Liania A Luzia, José M Souza, Nágila R Damasceno, Aluisio A Segurado, Patricia H Rondó
OBJECTIVE: HIV/AIDS is generally associated with dyslipidemia and oxidative imbalance, which are caused by the infection itself and by antiretroviral therapy (ART). The flavonoids, found in cocoa and yerba mate, have antioxidant and hypolipidemic properties. The aim of this study was to evaluate the effects of the consumption of dark chocolate and mate tea on the lipid profiles of individuals with HIV/AIDS who are undergoing ART. METHODS: A randomized, double-blind, placebo-controlled crossover clinical trial was conducted with 92 patients receiving ART for ≥6 mo and with viral suppression...
November 2017: Nutrition
https://www.readbyqxmd.com/read/28761046/fungal-community-succession-and-major-components-change-during-manufacturing-process-of-fu-brick-tea
#4
Qin Li, Jianan Huang, Yongdi Li, Yiyang Zhang, Yu Luo, Yuan Chen, Haiyan Lin, Kunbo Wang, Zhonghua Liu
Fu brick tea is a unique post-fermented tea product which is fermented with microorganism during the manufacturing process. Metabolic analysis showed that most metabolites content were decreased during the manufacturing process of Fu brick tea, except GA (gallic acid). Illumina MiSeq sequencing of ITS gene amplicons was applied to analyze the fungal community succession. The genera Aspergillus, Cyberlindnera and Candida were predominant at the early stage of manufacturing process (from "primary dark tea" to "fermentation for 3 days"), but after the stage of "fermentation for 3 days" only Aspergillus was still dominated, and maintain a relatively constant until to the end of manufacturing process...
July 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28649074/neurochemical-and-behavioral-effects-of-green-tea-camellia-sinensis-as-observed-in-animals-exposed-to-restraint-stress
#5
Huma Ikram, Beenish Mirza, Darakhshan Jabeen Haleem
Clinical studies on psychiatric patients suggest that life events stress precipitates depression. The possible involvement of 5-Hydroxy tryptamine (5-HT; Serotonin) in depression and other behavioral deficits is also suggested by clinical studies. As a natural stimulant, green tea (Camellia Sinensis) diminishes stress, worry and anxiety, allowing the brain to focus and concentrate better. Previously we have reported that beneficial effects of green tea might be associated with altered levels of 5-HT, which in turn may help in coping with stress...
March 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28630625/quantification-of-antioxidant-phenolic-compounds-in-a-new-chrysanthemum-cultivar-by-high-performance-liquid-chromatography-with-diode-array-detection-and-electrospray-ionization-mass-spectrometry
#6
Ah-Reum Han, Hyo Young Kim, Yangkang So, Bomi Nam, Ik-Soo Lee, Joo-Won Nam, Yeong Deuk Jo, Sang Hoon Kim, Jin-Baek Kim, Si-Yong Kang, Chang Hyun Jin
The flowers of Chrysanthemum morifolium Ramat. have been used as an herbal tea and in traditional medicine, and the plant has been developed to produce horticultural cultivars of various colors and shapes. In this study, a new chrysanthemum cultivar with dark purple petals (C. morifolium cv. ARTI-Dark Chocolate; ADC) was developed by radiation-induced mutation breeding of its original cultivar with purple striped white petals (C. morifolium cv. Noble Wine, NW). The phenolic profile and antioxidant property of ADC were investigated and compared with NW and the commercially available medicinal herb, C...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28528145/uv-induced-electron-transfer-between-triethylamine-and-5-bromo-2-deoxyuridine-a-puzzle-concerning-the-photochemical-debromination-of-labeled-dna
#7
Paweł Wityk, Magdalena Zdrowowicz, Justyna Wiczk, Janusz Rak
5-Bromo-2'-deoxyuridine (BrdU) photosensitizes DNA to strand break formation. However, this type of photodamage is completely quenched by the presence of triethylamine (TEA) which originates from RP-HPLC purification commonly employed by oligonucleotide providers. While the presence of TEA in oligonucleotide samples does not interfere with PCR or other molecular biology applications, the mechanism of photochemical reaction proceeding in the labeled DNA is dramatically changed due to the photoinduced electron transfer (PET) between the photoexcited BrdU and the ground state TEA...
May 11, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28490128/n-%C3%AE%C2%B5-carboxymethyl-lysine-and-n-%C3%AE%C2%B5-carboxyethyl-lysine-in-tea-and-the-factors-affecting-their-formation
#8
Ye Jiao, Jialiang He, Fengli Li, Guanjun Tao, Shuang Zhang, Shikang Zhang, Fang Qin, Maomao Zeng, Jie Chen
The levels of N(ε)-(carboxymethyl)lysine (CML) and N(ε)-(carboxyethyl)lysine (CEL) in 99 tea samples from 14 geographic regions, including 44 green, 7 oolong, 41 black, and 7 dark teas were determined by liquid chromatography-tandem mass spectrometry (LC-MS/MS). The CML and CEL contents varied from 11.0 to 1701μg/g tea and 4.6 to 133μg/g tea, respectively. Dark tea presented the highest levels of CML and CEL, whereas green and oolong teas presented the lowest levels. Five kinds of catechins in the tea were also analyzed, and spearman's correlation coefficients showed that all the catechins negatively correlated with CML and CEL...
October 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28422292/high-theabrownins-instant-dark-tea-product-by-aspergillus-niger-via-submerged-fermentation-%C3%AE-glucosidase-and-pancreatic-lipase-inhibition-and-antioxidant-activity
#9
Yuwan Wang, Mingyue Zhang, Zhengzhu Zhang, Hengqian Lu, Xueling Gao, Pengxiang Yue
BACKGROUND: Theabrownins (TB) are bioactive components that are usually extracted from Chinese dark tea, in which they are present at low concentrations. The present study aimed to produce an instant dark tea high in theabrownins via submerged fermentation by the fungus Aspergillus niger. Three fermentation parameters that affect theabrownins content (i.e. inoculum size, liquid-solid ratio and rotation speed) were optimized using response surface methodology. RESULT: Optimum fermentation conditions were modeled to be an inoculum of 5...
April 19, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28356040/the-relevance-of-dietary-polyphenols-in-cardiovascular-protection
#10
Ana Gabriela Murillo, Maria Luz Fernandez
The chemical structure of polyphenols consisting of aromatic rings, capable of quenching free radicals, makes them ideal candidates to protect against oxidation. Polyphenols are present in a variety of foods including grapes, berries, dark chocolate, coffee and tea to mention a few. A number of studies have shown that dietary polyphenols exert a protective effect against hypertension, dyslipidemias, inflammation, endothelial function and atherosclerosis, conditions associated with increased risk for cardiovascular disease...
March 29, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28339202/a-novel-acylated-flavonol-tetraglycoside-with-inhibitory-effect-on-lipid-accumulation-in-3t3-l1-cells-from-lu-an-guapian-tea-and-quantification-of-flavonoid-glycosides-in-six-major-processing-types-of-tea-running-title-a-novel-acylated-flavonol-tetraglycoside
#11
Wu-Xia Bai, Chao Wang, Yijun Wang, Wen-Jun Zheng, Wei Wang, Xiaochun Wan, Guan-Hu Bao
A novel acylated flavonol tetraglycoside, kaempferol 3-O-[(E)-p- coumaroyl-(1→2)][α-L-arabinopyranosyl-(1→3)][β-D-glucopyranosyl (1→3)-α-L- rhamnopyranosyl (1→6)]-β-D-glucopyranoside (camellikaempferoside C, 1), together with two flavonol and eighteen flavone and flavonol glycosides (FGs) (2-21) was isolated from the green tea Lu'an GuaPian (Camellia sinensis L.O. Kuntze). Their structures were identified by spectroscopic and chemical methods. Four acylated FGs (1, 7, 8, 9) were found to inhibit the proliferation and differentiation of 3T3-L1 preadipocytes at the concentrations 25, 50, 100 µM (P < 0...
March 24, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28249298/the-modern-japanese-color-lexicon
#12
Ichiro Kuriki, Ryan Lange, Yumiko Muto, Angela M Brown, Kazuho Fukuda, Rumi Tokunaga, Delwin T Lindsey, Keiji Uchikawa, Satoshi Shioiri
Despite numerous prior studies, important questions about the Japanese color lexicon persist, particularly about the number of Japanese basic color terms and their deployment across color space. Here, 57 native Japanese speakers provided monolexemic terms for 320 chromatic and 10 achromatic Munsell color samples. Through k-means cluster analysis we revealed 16 statistically distinct Japanese chromatic categories. These included eight chromatic basic color terms (aka/red, ki/yellow, midori/green, ao/blue, pink, orange, cha/brown, and murasaki/purple) plus eight additional terms: mizu ("water")/light blue, hada ("skin tone")/peach, kon ("indigo")/dark blue, matcha ("green tea")/yellow-green, enji/maroon, oudo ("sand or mud")/mustard, yamabuki ("globeflower")/gold, and cream...
March 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28216091/enantiomeric-and-quantitative-analysis-of-volatile-terpenoids-in-different-teas-camellia-sinensis
#13
Yin Zhu, Chen-Yang Shao, Hai-Peng Lv, Yue Zhang, Wei-Dong Dai, Li Guo, Jun-Feng Tan, Qun-Hua Peng, Zhi Lin
Volatile terpenoids play important roles in the formation of tea aroma quality due to their pleasant scents and low odor thresholds. Most volatile terpenoids contain stereogenic centers, which results in various stereo distributions of their enantiomers and diastereoisomers in different types of tea. However, the distribution characteristics of terpenoid enantiomers in teas were still unclear, which poses an obstacle to the scientific understanding of tea aroma. In this work, a new and efficient analysis approach based on headspace solid phase microextraction (HS-SPME)-chiral gas chromatography-mass spectrometry (GC-MS) was established to analyze 12 pairs of familiar terpenoid enantiomers in different teas...
March 24, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28163235/proteolysis-of-chloroplast-proteins-is-responsible-for-accumulation-of-free-amino-acids-in-dark-treated-tea-camellia-sinensis-leaves
#14
Yiyong Chen, Xiumin Fu, Xin Mei, Ying Zhou, Sihua Cheng, Lanting Zeng, Fang Dong, Ziyin Yang
Shade management (dark treatment) on tea (Camellia sinensis) plants is a common approach to improve free amino acids in raw materials of tea leaves. However, the reason for amino acid accumulation in dark-treated tea leaves is still unknown. In the present study, dark treatment significantly increased content of free amino acids and reduced content of soluble proteins in tea leaves. Quantitative proteomics analysis showed that most enzymes involved in biosyntheses of amino acids were down-accumulated by dark treatment...
March 22, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28142165/-influence-of-luxury-foodstuffs-on-glaucoma
#15
REVIEW
K K Huber-van der Velden
The term "luxury foodstuffs" refers to foods which are not consumed because of their nutritional value. Classic modern luxury foodstuffs are alcohol, caffeine-containing drinks, cocoa, sugar and tobacco. The following review article examines some of these modern luxury foodstuffs in detail, as well as their influence on glaucoma. Thus, small quantities of alcohol lower high intraocular pressure and have a positive influence on the blood circulation of the optic nerve. In addition, red wine polyphenols exert vasoprotective effects...
February 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28103237/adult-tea-green-leafhoppers-empoasca-onukii-matsuda-change-behaviors-under-varying-light-conditions
#16
Longqing Shi, Liette Vasseur, Huoshui Huang, Zhaohua Zeng, Guiping Hu, Xin Liu, Minsheng You
Insect behaviors are often influenced by light conditions including photoperiod, light intensity, and wavelength. Understanding pest insect responses to changing light conditions may help with developing alternative strategies for pest control. Little is known about the behavioral responses of leafhoppers (Hemiptera: Cicadellidae) to light conditions. The behavior of the tea green leafhopper, Empoasca onukii Matsuda, was examined when exposed to different light photoperiods or wavelengths. Observations included the frequency of locomotion and cleaning activities, and the duration of time spent searching...
2017: PloS One
https://www.readbyqxmd.com/read/28067118/profiling-elements-in-puerh-tea-from-yunnan-province-china
#17
Jianyang Zhang, Guicen Ma, Liyan Chen, Ting Liu, Xin Liu, Chengyin Lu
Puerh tea, as the most representative Chinese dark tea, has attracted global interest in recent years. Profiling the levels of metal elements in Puerh tea is very important since its presence is related to human health. In this study, 41 elements in 98 Puerh tea samples from Yunnan province, China including Puerh raw tea and Puerh ripe tea were evaluated by microwave digestion combined with inductively coupled plasma mass spectrometry . The content of toxic elements, essential elements and rare earth elements of Puerh tea from different regions was discussed in detail...
September 2017: Food Additives & Contaminants. Part B, Surveillance
https://www.readbyqxmd.com/read/27690376/diversity-and-variation-of-bacterial-community-revealed-by-miseq-sequencing-in-chinese-dark-teas
#18
Jianyu Fu, Haipeng Lv, Feng Chen
Chinese dark teas (CDTs) are now among the popular tea beverages worldwide due to their unique health benefits. Because the production of CDTs involves fermentation that is characterized by the effect of microbes, microorganisms are believed to play critical roles in the determination of the chemical characteristics of CDTs. Some dominant fungi have been identified from CDTs. In contrast, little, if anything, is known about the composition of bacterial community in CDTs. This study was set to investigate the diversity and variation of bacterial community in four major types of CDTs from China...
2016: PloS One
https://www.readbyqxmd.com/read/27681250/in-vitro-%C3%AE-glucosidase-inhibitory-activity-of-isolated-fractions-from-water-extract-of-qingzhuan-dark-tea
#19
Shuyuan Liu, Zhi Yu, Hongkai Zhu, Wei Zhang, Yuqiong Chen
BACKGROUND: Natural products have being used as potential inhibitors against carbohydrate-hydrolyzing enzymes to treat diabetes mellitus. Chinese dark tea has various interesting bioactivities. In this study, the active compounds from Qingzhuan dark tea were separated and their anti-diabetic activity was examined using an in vitro enzymatic model. METHODS: The chloroform, ethyl acetate, n-butanol, sediment and residual aqua fractions of a Chinese dark tea (Qingzhuan tea) were prepared by successively isolating the water extract with different solvents and their in vitro inhibitory activities against α-glucosidase were assessed...
September 29, 2016: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/27658659/natural-antioxidant-ice-cream-acutely-reduces-oxidative-stress-and-improves-vascular-function-and-physical-performance-in-healthy-individuals
#20
RANDOMIZED CONTROLLED TRIAL
Valerio Sanguigni, Melania Manco, Roberto Sorge, Lucio Gnessi, Davide Francomano
OBJECTIVE: The formation of reactive oxygen species (ROS) contributes to the pathogenesis and progression of several diseases. Polyphenols have been shown to be beneficial against ROS. The aim of this study was to evaluate the effects of a natural antioxidant ice cream on oxidative stress, vascular function, and physical performance. METHODS: In this controlled, single-blind, crossover study, 14 healthy individuals were randomized to consume 100 g of either antioxidant ice cream containing dark cocoa powder and hazelnut and green tea extracts or milk chocolate ice cream (control ice cream)...
January 2017: Nutrition
keyword
keyword
116982
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"