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https://www.readbyqxmd.com/read/27908701/inhibitory-effects-of-l-theanine-on-airway-inflammation-in-ovalbumin-induced-allergic-asthma
#1
Yong Pil Hwang, Sun Woo Jin, Jae Ho Choi, Chul Yung Choi, Hyung Gyun Kim, Se Jong Kim, Yongan Kim, Kyung Jin Lee, Young Chul Chung, Hye Gwang Jeong
L-theanine, a water-soluble amino acid isolated from green tea (Camellia sinensis), has anti-inflammatory activity, antioxidative properties, and hepatoprotective effects. However, the anti-allergic effect of L-theanine and its underlying molecular mechanisms have not been elucidated. In this study, we investigated the protective effects of L-theanine on asthmatic responses, particularly airway inflammation and oxidative stress modulation in an ovalbumin (OVA)-induced murine model of asthma. Treatment with L-theanine dramatically attenuated the extensive trafficking of inflammatory cells into bronchoalveolar lavage fluid (BALF)...
November 28, 2016: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/27872968/new-functions-and-potential-applications-of-amino-acids
#2
Hisayuki Uneyama, Hisamine Kobayashi, Naoto Tonouchi
Currently, several types of amino acids are being produced and used worldwide. Nevertheless, several new functions of amino acids have been recently discovered that could result in other applications. For example, oral stimulation by glutamate triggers the cephalic phase response to prepare for food digestion. Further, the stomach and intestines have specific glutamate-recognizing systems in their epithelial mucosa. Regarding clinical applications, addition of monosodium glutamate to the medicinal diet has been shown to markedly enhance gastric secretion in a vagus-dependent manner...
November 22, 2016: Advances in Biochemical Engineering/biotechnology
https://www.readbyqxmd.com/read/27855934/variation-of-theanine-phenolic-and-methylxanthine-compounds-in-21-cultivars-of-camellia-sinensis-harvested-in-different-seasons
#3
Rui Fang, Sally P Redfern, Don Kirkup, Elaine A Porter, Geoffrey C Kite, Leon A Terry, Mark J Berry, Monique S J Simmonds
This is the first study to use chemometric methods to differentiate among 21 cultivars of Camellia sinensis from China and between leaves harvested at different times of the year using 30 compounds implicated in the taste and quality of tea. Unique patterns of catechin derivatives were observed among cultivars and across harvest seasons. C. sinensis var. pubilimba (You 510) differed from the cultivars of C. sinensis var. sinensis, with higher levels of theobromine, (+)-catechin, gallocatechin, gallocatechin gallate and theasinensin B, and lower levels of (-)-epicatechin, (-)-epigallocatechin (EGC) and (-)-epigallocatechin gallate (EGCG), respectively...
April 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27809221/tea-polysaccharides-and-their-bioactivities
#4
REVIEW
Ling-Ling Du, Qiu-Yue Fu, Li-Ping Xiang, Xin-Qiang Zheng, Jian-Liang Lu, Jian-Hui Ye, Qing-Sheng Li, Curt Anthony Polito, Yue-Rong Liang
Tea (Camellia sinensis) is a beverage beneficial to health and is also a source for extracting bioactive components such as theanine, tea polyphenols (TPP) and tea polysaccharides (TPS). TPS is a group of heteropolysaccharides bound with proteins. There is evidence showing that TPS not only improves immunity but also has various bioactivities, such as antioxidant, antitumor, antihyperglycemia, and anti-inflammation. However, inconsistent results concerning chemical composition and bioactivity of TPS have been published in recent years...
October 30, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27786360/influence-of-brewing-conditions-on-taste-components-in-fuding-white-tea-infusions
#5
Haihua Zhang, Yulin Li, Yangjun Lv, Yulan Jiang, Junxian Pan, Yuwei Duan, Yuejin Zhu, Shikang Zhang
BACKGROUND: White tea has received increasing attention of late as a result of its sweet taste and health benefits. During the brewing of white tea, many factors may affect the nutritional and sensory quality of the resulting infusions. The present study aimed to investigate the effect of various infusion conditions on the taste components of Fuding white tea, including infusion time, ratio of tea and water, number of brewing steps, and temperature. RESULTS: Brewing conditions had a strong effect on the taste compound profile and sensory characteristics...
October 27, 2016: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/27765356/anti-stress-effects-of-drinking-green-tea-with-lowered-caffeine-and-enriched-theanine-epigallocatechin-and-arginine-on-psychosocial-stress-induced-adrenal-hypertrophy-in-mice
#6
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
https://www.readbyqxmd.com/read/27765250/determination-of-volatile-organic-compounds-catechins-caffeine-and-theanine-in-jukro-tea-at-three-growth-stages-by-chromatographic-and-spectrometric-methods
#7
Dong Bok Jeon, Young Shin Hong, Ga Hyun Lee, Yu Min Park, Cheong Mi Lee, Eun Yeong Nho, Ji Yeon Choi, Nargis Jamila, Naeem Khan, Kyong Su Kim
Tea contains characteristic volatile organic compounds, polyphenols, caffeine and catechins, and is therefore among the most widely consumed beverages all over the world. In this study, fresh Jukro tea leaves collected from Damyang-gun (Jeollanam-do) at 40, 60 and 90day growth stages, were semi-fermented. The volatile organic compounds (VOCs) were extracted by simultaneous distillation-solvent extraction (SDE) and analyzed by gas chromatography/mass spectrometry (GC/MS). Catechins, caffeine and theanine were analyzed by high performance liquid chromatography (HPLC)...
March 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27698535/l-theanine-protects-against-excess-dopamine-induced-neurotoxicity-in-the-presence-of-astrocytes
#8
Mika Takeshima, Ikuko Miyazaki, Shinki Murakami, Taizo Kita, Masato Asanuma
l-Theanine (γ-glutamylethylamide), a component of green tea, is considered to have regulatory and neuroprotective roles in the brain. The present study was designed to determine the effect of l-theanine on excess dopamine-induced neurotoxicity in both cell culture and animal experiments. The primary cultured mesencephalic neurons or co-cultures of mesencephalic neurons and striatal astrocytes were pretreated with l-theanine for 72 h, and then treated with excess dopamine for further 24 h. The cell viability of dopamine neurons and levels of glutathione were evaluated...
September 2016: Journal of Clinical Biochemistry and Nutrition
https://www.readbyqxmd.com/read/27664666/preparation-of-sers-active-substrates-based-on-graphene-oxide-silver-nanocomposites-for-rapid-zdetection-of-l-theanine
#9
Huajun Zheng, Dejiang Ni, Zhi Yu, Pei Liang
A kind of graphene oxide/silver (GO/Ag) nanocomposites with high Surface enhanced Raman scattering (SERS) activity were fabricated via a facile and green liquid phase reduction method. The synthesized materials were characterized in detail using various microscopic and spectroscopic techniques. In this method, the GO sheets worked as a holder which makes silver nanoparticles (AgNPs) aggregate to a particular morphology, and under a suitable dosage of silver ions, well-dispersed AgNPs on the surface of GO were obtained, which could generate more "hot spots" of SERS...
February 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27649883/l-theanine-attenuates-cadmium-induced-neurotoxicity-through-the-inhibition-of-oxidative-damage-and-tau-hyperphosphorylation
#10
Peiling Ben, Zhengping Zhang, Yanyan Zhu, Aiying Xiong, Yanhong Gao, Jianyun Mu, Zhimin Yin, Lan Luo
Cadmium (Cd) has long been known to induce neurological degenerative disorders. We studied effects of l-theanine, one of the major amino acid components in green tea, on Cd-induced brain injury in mice. Male ICR mice were intraperitoneally injected with l-theanine (100 or 200mg/kg/day) or saline and after one hour these mice were orally administrated with CdCl2 (3.75-6mg/kg). The treatment was conducted for 8 weeks. l-Theanine significantly reduced Cd level in the mouse brain and plasma. Cd-induced neuronal cell death in the mouse cortex and hippocampus were apparently inhibited by l-theanine treatment...
September 17, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27633949/analysis-of-theanine-in-tea-camellia-sinensis-dietary-ingredients-and-supplements-by-high-performance-liquid-chromatography-with-postcolumn-derivatization-single-laboratory-validation-first-action-2016-10
#11
Maria Ofitserova, Sareeta Nerkar
An HPLC method with postcolumn derivatization was developed and validated for the determination of theanine content in tea dietary ingredients and supplements. A variety of common commercially available supplement forms such as powders, liquid tinctures, tablets, softgels, and gelcaps, as well as three National Institute of Standards and Technology Camellia sinensis Standard Reference Materials were investigated in the study. A simple extraction procedure using citrate buffer at pH 2.2 allowed for the analysis of theanine without additional cleanup or concentration steps, even at low ppm levels...
September 15, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27625668/brassinosteroids-improve-quality-of-summer-tea-camellia-sinensis-l-by-balancing-biosynthesis-of-polyphenols-and-amino-acids
#12
Xin Li, Golam J Ahammed, Zhi-Xin Li, Lan Zhang, Ji-Peng Wei, Chen Shen, Peng Yan, Li-Ping Zhang, Wen-Yan Han
Summer grown green tea is less popular due to bitterness and high astringency, which are attributed to high levels of tea polyphenols (TP) and low levels of amino acids (AA) in tea leaves (Camellia sinensis L.). Brassinosteroids (BRs), a group of steroidal plant hormones can regulate primary and secondary metabolism in a range of plant species under both normal and stress conditions. However, specific effects of BRs on the photosynthesis of tea plants and the quality of summer green tea are largely unknown...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27623718/new-phytochemicals-as-potential-human-anti-aging-compounds-reality-promise-and-challenges
#13
Rubia C G Corrêa, Rosane M Peralta, Charles W I Haminiuk, Giselle Maria Maciel, Adelar Bracht, Isabel C F R Ferreira
Aging is an inevitable process influenced by genetic, lifestyle and environmental factors. Indirect evidence shows that several phytochemicals can have anti-aging capabilities, although direct evidence in this field is still limited. This report aims to provide a critical review on aspects related to the use of novel phytochemicals as anti-aging agents, to discuss the obstacles found when performing most anti-aging study protocols in humans, and to analyze future perspectives. In addition to the extensively studied resveratrol, epicatechin, quercetin and curcumin, new phytochemicals have been reported to act as anti-aging agents, such as the amino acid L-theanine isolated from green tea, and the lignans arctigenin and matairesinol isolated from Arctium lappa seeds...
September 13, 2016: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/27612630/theanine-from-tea-and-its-semi-synthetic-derivative-tbrc-suppress-human-cervical-cancer-growth-and-migration-by-inhibiting-egfr-met-akt-nf-%C3%AE%C2%BAb-signaling
#14
Jiannan Liu, Yuping Sun, Huarong Zhang, Dexin Ji, Fei Wu, Huihui Tian, Kun Liu, Ying Zhang, Benhao Wu, Guoying Zhang
Cervical cancer is the third most prevalent cancer among women worldwide. Theanine from tea and its derivatives show some anticancer activities. However, the role of theanine and its derivatives against human cervical cancer and the molecular mechanisms of action remain unclear. Thus, in this study, we aim to investigate the anticancer activities and underlying mechanisms of theanine and a theanine derivative, ethyl 6-bromocoumarin-3- carboxylyl L-theanine (TBrC), against human cervical cancer. In vitro and in vivo assays for cancer cell growth and migration have confirmed the inhibition of the cell growth and migration by TBrC and theanine in highly-metastatic human cervical cancer...
September 6, 2016: European Journal of Pharmacology
https://www.readbyqxmd.com/read/27609021/biochemical-and-transcriptomic-analyses-reveal-different-metabolite-biosynthesis-profiles-among-three-color-and-developmental-stages-in-anji-baicha-camellia-sinensis
#15
Chun-Fang Li, Yan-Xia Xu, Jian-Qiang Ma, Ji-Qiang Jin, Dan-Juan Huang, Ming-Zhe Yao, Chun-Lei Ma, Liang Chen
BACKGROUND: The new shoots of the albino tea cultivar 'Anji Baicha' are yellow or white at low temperatures and turn green as the environmental temperatures increase during the early spring. 'Anji Baicha' metabolite profiles exhibit considerable variability over three color and developmental stages, especially regarding the carotenoid, chlorophyll, and theanine concentrations. Previous studies focused on physiological characteristics, gene expression differences, and variations in metabolite abundances in albino tea plant leaves at specific growth stages...
2016: BMC Plant Biology
https://www.readbyqxmd.com/read/27569455/repression-of-human-hepatocellular-carcinoma-growth-by-regulating-met-egfr-vegfr-akt-nf-%C3%AE%C2%BAb-pathways-with-theanine-and-its-derivative-r-2-6-8-dibromo-2-oxo-2h-chromene-3-carboxamido-5-ethylamino-5-oxopentanoic-ethyl-ester-dtbrc
#16
Guoying Zhang, Zheng Li, Xiaochun Wan, Ying Zhang, Rongqin Zhu, Zhenzhen Liu, Dexin Ji, Huarong Zhang, Fei Wu, Huihui Tian, Kun Liu, Benhao Wu
To explore the potential of theanine against cancer, we have studied the anticancer activities of theanine from tea and its semisynthesized derivative, (R)-2-(6,8-dibromo-2-oxo-2H-chromene-3-carboxamido)-5-(ethylamino)-5-oxopentanoic ethyl ester (DTBrC), in in vitro, ex vivo, and in vivo models of human hepatocellular carcinoma (HHC). Theanine and DTBrC displayed inhibitory effects on the growth and migration of HHC cells in vitro, ex vivo, and in vivo. Theanine and DTBrC significantly enhanced the repression of HHC cell growth in combination with anticancer drug pirarubicin...
September 21, 2016: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/27407065/the-identification-and-evaluation-of-two-different-color-variations-of-tea
#17
Yuchen Li, Changsong Chen, Yusheng Li, Zhaotang Ding, Jiazhi Shen, Yu Wang, Lei Zhao, Meng Xu
BACKGROUND: The tea plant, Camellia sinensis (L.) O. Kuntz, is a perennial woody plant widely cultivated for the production of a popular non-alcoholic beverage. To rapidly identify and evaluate two different color tea varieties (yellowish and purplish), the main phenotypic traits and quality components were tested in this study. Then the metabolic profiles of tea shoots and leaves were analyzed using LC-MS/MS. RESULTS: The yellowish variation had higher active level in catechins metabolism, and contents of luteolin and kaempferol 3-α-D-glucoside were much higher than others...
July 13, 2016: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/27396868/effects-of-chronic-l-theanine-administration-in-patients-with-major-depressive-disorder-an-open-label-study
#18
Shinsuke Hidese, Miho Ota, Chisato Wakabayashi, Takamasa Noda, Hayato Ozawa, Tsutomu Okubo, Hiroshi Kunugi
OBJECTIVE: l-theanine, an amino acid uniquely contained in green tea (Camellia sinensis), has been suggested to have various psychotropic effects. This study aimed to examine whether l-theanine is effective for patients with major depressive disorder (MDD) in an open-label clinical trial. METHODS: Subjects were 20 patients with MDD (four males; mean age: 41.0±14.1 years, 16 females; 42.9±12.0 years). l-theanine (250 mg/day) was added to the current medication of each participant for 8 weeks...
July 11, 2016: Acta Neuropsychiatrica
https://www.readbyqxmd.com/read/27306219/oral-administration-of-the-amino-acids-cystine-and-theanine-attenuates-the-adverse-events-of-s-1-adjuvant-chemotherapy-in-gastrointestinal-cancer-patients
#19
Takashi Tsuchiya, Hiroshi Honda, Masaya Oikawa, Tetsuya Kakita, Atsushi Oyama, Hidekazu Oishi, Katsuyuki Tochikubo, Takanao Hashimoto, Shigekazu Kurihara, Tetsuro Shibakusa, Takashi Kayahara
BACKGROUND: Nutritional therapy is used to reduce the adverse events (AEs) of anticancer drugs. Here, we determined whether the amino acids cystine and theanine, which provide substrates for glutathione, attenuated the AEs of S-1 adjuvant chemotherapy. METHODS: Patients scheduled to receive S-1 adjuvant chemotherapy were randomized to the C/T or the control groups. The C/T group received 700 mg cystine and 280 mg theanine orally 1 week before the administration of S-1, which then continued for 5 weeks...
December 2016: International Journal of Clinical Oncology
https://www.readbyqxmd.com/read/27066035/transcriptomic-analysis-reveals-the-molecular-mechanisms-of-drought-stress-induced-decreases-in-camellia-sinensis-leaf-quality
#20
Weidong Wang, Huahong Xin, Mingle Wang, Qingping Ma, Le Wang, Najeeb A Kaleri, Yuhua Wang, Xinghui Li
The tea plant [Camellia sinensis (L.) O. Kuntze] is an important commercial crop rich in bioactive ingredients, especially catechins, caffeine, theanine and other free amino acids, which the quality of tea leaves depends on. Drought is the most important environmental stress affecting the yield and quality of this plant. In this study, the effects of drought stress on the phenotype, physiological characteristics and major bioactive ingredients accumulation of C. sinensis leaves were examined, and the results indicated that drought stress resulted in dehydration and wilt of the leaves, and significant decrease in the total polyphenols and free amino acids and increase in the total flavonoids...
2016: Frontiers in Plant Science
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