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Articoli di riviste sul tema "Green tea"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 29 luglio 2024

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1

Rahman, M., I. A. Jahan, S. Ahmed, K. S. Ahmed, M. Roy, W. Zzaman e I. Ahmad. "Bioactive compounds and antioxidant activity of black and green tea available in Bangladesh". Food Research 5, n. 3 (16 maggio 2021): 107–11. http://dx.doi.org/10.26656/fr.2017.5(3).491.

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People in Bangladesh are traditionally used to consume mainly black tea. However, some tea manufacturing companies are now producing green tea, though in a small scale. To create new knowledge as well as awareness about the consumption of green tea, the present study was carried out to compare the black and green tea available in Bangladesh based on their bioactive compounds and antioxidant activity. A total of eight brands of black tea and two brands of green tea were bought from the supermarkets. Total phenolics, total tannin, total flavonoids, and caffeine content were measured as bioactive compounds, and antioxidant activity was evaluated by using two different methods such as DPPH (1,1- diphenyl-2-picrylhydrazyl) radical-scavenging activity and ABTS+ radical scavenging activity of methanol extracts of black and green tea. Every bioactive compound in black and green tea was found to be significantly different (P < 0.05). The total phenolic content, on average, was measured at 242.46 mg GAE/g dry extract and 763.41 mg GAE/ g dry extract in black and green tea, respectively. Black tea contained 6.47 mg TAE/g dry extract tannin, whereas green tea had much more tannin content, 14.51 mg TAE/g dry extract, which is more than double in amount. On the other hand, the total flavonoid content was almost double in black tea (61.82 mg QE/g dry extract) compared to green tea (31.85 mg QE/g dry extract). Antioxidant activities were determined at different concentrations of tea samples. At every concentration, green tea presented higher ABTS+ and DPPH radical scavenging activity than black tea. The highest percentage of inhibition was observed at 20 ppm both in black and green tea, finding 98.50 % and 99.07 % inhibition, respectively. Overall, significantly (P < 0.05) higher amount of phenolic compounds as well as antioxidant activity were observed in green tea.

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&NA;. "Green tea". Reactions Weekly &NA;, n. 1163 (agosto 2007): 14. http://dx.doi.org/10.2165/00128415-200711630-00043.

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&NA;. "Green tea". Reactions Weekly &NA;, n. 1132 (dicembre 2006): 10–11. http://dx.doi.org/10.2165/00128415-200611320-00028.

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&NA;. "Green tea". Reactions Weekly &NA;, n. 1135 (gennaio 2007): 17. http://dx.doi.org/10.2165/00128415-200711350-00065.

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&NA;. "Green tea". Reactions Weekly &NA;, n. 1269 (settembre 2009): 22. http://dx.doi.org/10.2165/00128415-200912690-00061.

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&NA;. "Green tea". Reactions Weekly &NA;, n. 1249 (aprile 2009): 23. http://dx.doi.org/10.2165/00128415-200912490-00074.

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&NA;. "Green tea". Reactions Weekly &NA;, n. 1308 (luglio 2010): 20. http://dx.doi.org/10.2165/00128415-201013080-00055.

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8

Hutcheon, Deborah A., e Jane Ziegler. "Green Tea". Topics in Clinical Nutrition 29, n. 3 (2014): 268–77. http://dx.doi.org/10.1097/tin.0000000000000004.

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Hume, Anne L. "Green tea". Pharmacy Today 25, n. 9 (settembre 2019): 16. http://dx.doi.org/10.1016/j.ptdy.2019.08.007.

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10

Guslandi, Mario. "Green tea". Alimentary Pharmacology & Therapeutics 19, n. 10 (29 aprile 2004): 1135. http://dx.doi.org/10.1111/j.1365-2036.2004.01953.x.

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11

Record, Ian R., Jennifer K. McInerney e Ivor E. Dreosti. "Black tea, green tea, and tea polyphenols". Biological Trace Element Research 53, n. 1-3 (giugno 1996): 27–43. http://dx.doi.org/10.1007/bf02784542.

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12

Song, H. S. "Antioxidant effects of green tea extracts on lipid oxidation of half-dried eels". Food Research 5, n. 2 (21 febbraio 2021): 62–66. http://dx.doi.org/10.26656/fr.2017.5(2).620.

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In order to explore the change of lipid oxidation of half-dried eels treated with green tea extracts and stored frozen, acid values, peroxide values, carbonyl values, and TBA values were measured. The eels were placed into the plastic bag and soaked for 1 hr in the solution mixed with distilled water and green tea extracts, and also vacuumed and stored frozen at –18 ∼ –20°C for 9 months after being dried with a hot-air blower for 15 hrs at 35°C (Aw 90-91). The control consisted of eels prepared in the same way without any pretreatment. At the end of the 1st month, 3rd month, 6th month, and 9th month, eel oil obtained from the samples were tested for its lipid oxidation. The activity of green tea extracts 1 mL was very similar to Vitamin C 500 μM 0.8 mL. The acid values, peroxide values, carbonyl values, and TBA values of eels treated with green tea extracts were lower than those of the control during 9 months of frozen storage (p<0.05). While the acid values and peroxide values of the control and eels treated with green tea extracts highly increased after the first month of frozen storage, the TBA values increased greatly on the third month of frozen storage. Compared to the control, the pre-application of green tea extracts to half-dried eels meaningfully prevented the generation of TBA compound during the frozen storage (p<0.01). In conclusion, pre-application of green tea extracts was effective in delaying early-stage peracid inducement and preventing the generation of secondary oxidation compounds, such as carbonyl compound and TBA compound, in the course of the drying and frozen storage

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Li, Yong, Xunhua Zheng, Xiaoqing Fu e Yanzheng Wu. "Is green tea still ‘green’?" Geo: Geography and Environment 3, n. 2 (luglio 2016): e00021. http://dx.doi.org/10.1002/geo2.21.

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14

Stoddart, Alison. "Green tea therapy". Nature Materials 13, n. 11 (24 ottobre 2014): 998. http://dx.doi.org/10.1038/nmat4128.

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15

Muir, Maya. "(Green) Tea Time". Alternative and Complementary Therapies 4, n. 1 (febbraio 1998): 43–47. http://dx.doi.org/10.1089/act.1998.4.43.

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16

Kumar, Nagi B. "Green Tea Polyphenols". Evidence-Based Integrative Medicine 2, n. 1 (2005): 13–18. http://dx.doi.org/10.2165/01197065-200502010-00004.

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17

Ross, Stephanie Maxine. "Green Tea Chings". Holistic Nursing Practice 21, n. 5 (settembre 2007): 280–82. http://dx.doi.org/10.1097/01.hnp.0000287991.47838.94.

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18

Susilowati, Agustina, Qarriy ‘Aina Urfiyya, Andi Wijaya, Reksi Sundu e Risa Supriningrum. "Perbandingan Efek Antihipertensi Ekstrak Etanol White Tea, Yellow Tea, Black Dragon Tea dan Green Tea". Media Farmasi 20, n. 1 (20 aprile 2024): 101–9. http://dx.doi.org/10.32382/mf.v20i1.236.

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Comparison Of Antihypertension Effects Of White Tea, Yellow Tea, Black Dragon Tea And Green Tea Ethanol Extracts In Indonesia, hypertension is still a significant health issue. Every year, Indonesia sees a rise in the prevalence of hypertension. Green tea, black dragon tea, white tea, and yellow tea all contain flavonoid antioxidants that may be used to treat hypertension by acting through the antioxidant route. The comparison of the antihypertensive effects of various ethanol extracts of white tea, yellow tea, blackdragon tea, and premium green tea (Camellia sinensis L.) is the main goal of this study. Pretest-Posttest Control Group Design research is this kind of experimental study. White tea, yellow tea, black dragon tea, and premium green tea (Camellia sinensis L.) were all subjected to antihypertensive tests using various ethanol extracts. Thirty Wistar rats were placed into six groups for the antihypertension test, each group comprising are group I (CMC. Na 1%), Group II (Captopril 2.25 mg/kgW), Groups III, IV, V and VI were the treatment groups. which consists of administering ethanol extracts of White Tea, Yellow Tea, Black Dragon Tea and Green Tea Premium at a dose of 500 mg/kgW. Blood pressure checks were carried out 3 times, namely before induction (TD I), after induction (TD II), and after being given the test solution (TD III). The results of the blood measurements then calculate the antihypertensive activity. In this study, it was discovered that captopril had a 40.0% antihypertensive action, compared to 33.3% for white tea ethanol extract, 37.2% for yellow tea, 37.7% for black dragon tea, and 38.0% for green tea. The results of this study indicate that the four ethanol extracts of tea, when administered at a dose of 500 mg/kgBB, can have an antihypertensive effect. However, only yellow tea, black dragon tea, and green tea are not substantially different from captopril (p>0.05). Hipertensi masih menjadi suatu masalah kesehatan yang cukup besar di Indonesia. Prevalensi hipertensi di Indonesia terus meningkat setiap tahunnya. White tea, yellow tea, black dragon tea dan green tea mengandung senyawa flavonoid sebagai antioksidan yang dapat berpotensi sebagai antihipertensi dengan melalui jalur antioksidan. Tujuan dari penelitian ini yaitu mengetahui perbandingan efek antihipertensi berbagai ekstrak etanol white tea, yellow tea, blackdragon tea dan green tea premium (Camellia sinensis L.). Jenis penelitian ini yaitu penelitian eksperimental Pretest-Posttest Control Group Design. Uji antihipertensi berbagai ekstrak etanol berbagai produk teh yaitu white tea, yellow tea, black dragon tea dan green tea premium (Camellia sinensis L.). Pada uji antihipertensi, 30 ekor tikus galur wistar di bagi menjadi 6 kelompok yang terdiri dari kelompok I (CMC. Na 1%), Kelompok II (Captopril 2,25 mg/kgBB), Kelompok III, IV, V dan VI merupakan kelompok perlakuan yang terdiri dari pemberian ekstrak etanol White Tea, Yellow Tea, Black Dragon Tea dan Green Tea Premium dengan dosis 500 mg/kgBB. Pengecekan tekanan darah dilakukan sebanyak 3 kali yaitu pada sebelum penginduksian (TD I), setelah penginduksian (TD II), dan setelah diberikan larutan uji (TD III). Hasil Pengukuran darah tersebut kemudian dihitung aktivitas antihipertensinya. Pada penelitian ini dapat diperoleh data bahwa aktivitas antihipertensi Captopril 40,0%, ekstrak etanol white tea 33,3%, yellow tea 37,2%, black dragon tea 37,7% dan green tea 38,0%. Melalui penelitian ini dapat disimpulkan bahwa keempat ekstrak etanol teh tersebut dengan dosis 500mg/kgBB dapat berefek sebagai antihipertensi, namun hanya yellow tea, black dragon tea dan green tea yang tidak berbeda bermakna (p>0,05) dibandingkan dengan captopril.

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Naumovski, Nenad, Alexandra Foscolou, Nathan M. D’Cunha, Stefanos Tyrovolas, Christina Chrysohoou, Labros S. Sidossis, Loukianos Rallidis et al. "The Association between Green and Black Tea Consumption on Successful Aging: A Combined Analysis of the ATTICA and MEDiterranean ISlands (MEDIS) Epidemiological Studies". Molecules 24, n. 10 (15 maggio 2019): 1862. http://dx.doi.org/10.3390/molecules24101862.

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Tea is one of the most-widely consumed beverages in the world with a number of different beneficial health effects, mainly ascribed to the polyphenolic content of the tea catechins. The aim of this study was to examine the consumption of green, black, or no tea, in relation to the previously validated successful ageing index (SAI; higher values “healthier” ageing) in a combined analysis of adults aged >50 years old from the ATTICA (n = 1128 adults from Athens, Greece metropolitan area) and the MEDiterranean Islands Study (MEDIS) (n = 2221 adults from various Greek island and Mani) studies. After adjusting for age, sex, smoking, and coffee consumption, green tea was positively associated with SAI (b ± SE: 0.225 ± 0.055, p < 0.001), while black tea was negatively associated with SAI (unstandardized b coefficient ± Standard error: −0.807 ± 0.054, p < 0.001). Green tea (vs black tea) consumption, had higher odds of a SAI of over 3.58 out of 10 (OR: 1.77, 95% CI: 1.38–2.28). Green tea consumption was also associated with higher levels of physical activity (p < 0.001) and reduced likelihood of hypertension (p = 0.006) compared with black tea. Two possible mechanisms are that green tea possesses high levels of catechins such as (−)-epigallocatechin 3-gallate and l-theanine compared with black tea. Therefore, the present analysis supports both the role of green tea constituents in successful ageing, as well as its role as an important component of an overall healthy diet in adults aged 50 years and over from these two epidemiological studies.

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Maheswari, C., R. Venkatnarayanan, P. Babu e C. S. Kandasamy. "Green Tea (Cardiac Tea) vs Java Tea (Kidney Tea): A Review". Research Journal of Pharmacy and Technology 8, n. 1 (2015): 94. http://dx.doi.org/10.5958/0974-360x.2015.00018.9.

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HUI, KEE XIAO, e SITI RAIHANAH SHAFIE. "ADDITION OF MILK ENHANCED THE TOTAL PHENOLIC CONTENT AND ANTIOXIDANT ACTIVITY OF Camellia sinensis (GREEN TEA) BEVERAGES". Malaysian Applied Biology 50, n. 3 (31 dicembre 2021): 95–104. http://dx.doi.org/10.55230/mabjournal.v50i3.2011.

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The study was aimed to determine the effects of adding milk, sugar and sweeteners to the total phenolic content and antioxidant activity of Camellia Sinensis (green tea) powder. Six green tea samples were brewed in cold water and whisked: Green tea powder (G), green tea powder with sugar (GS), green tea powder with aspartame (GA), green tea powder with milk (GM), green tea powder with milk and sugar (GMS) and green tea powder with milk and aspartame (GMA). The total phenolic content of green tea powder samples was evaluated by using Folin-Ciocalteu assay while α,α-diphenyl-2-picrylhydrazyl (DPPH) and ferric reducing antioxidant power (FRAP) assays were used to measure the antioxidant activity. Results showed that milk addition significantly enhanced by 59.84% of total phenolic content and also increased 26.3% (DPPH) and 42.35% (FRAP) of antioxidant activity of green tea powder, as compared to green tea samples without milk (p<0.05). Strong and positive correlations were found between the total phenolic content and antioxidant activity of green tea powder by using DPPH (r=0.990) and FRAP assays (r=0.997). In conclusion, it might be beneficial when milk is added to green tea as it could help to increase its antioxidant properties.

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22

Reich, Eike, Anne Schibli, Valeria Widmer, Ruth Jorns, Evelyn Wolfram e Alison DeBatt. "HPTLC Methods for Identification of Green Tea and Green Tea Extract". Journal of Liquid Chromatography & Related Technologies 29, n. 14 (agosto 2006): 2141–51. http://dx.doi.org/10.1080/15512160600760293.

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Song, Dae-Kyu. "Green tea: a tea or a remedy?" Integrative Medicine Research 3, n. 1 (marzo 2014): 1–3. http://dx.doi.org/10.1016/j.imr.2014.01.002.

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Auralia, Muthia, Bambang Sumanto e Irene Kartika Eka Wijayanti. "POLA KONSUMSI DAN KOMPONEN YANG DIPERTIMBANGKAN OLEH KONSUMEN TEH HITAM DAN TEH HIJAU DI KECAMATAN PURWOKERTO SELATAN". SEPA: Jurnal Sosial Ekonomi Pertanian dan Agribisnis 20, n. 2 (30 settembre 2023): 214. http://dx.doi.org/10.20961/sepa.v20i2.58512.

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<p><em>People consume black tea and green tea with certain characteristics in accordance with their wishes and needs. The rating of the product shows the attitude of the people towards a product as well and also reflects their preferences in spending and consuming a product. The aim of this research is to analyse the characteristics of black tea and green tea consumers, to analyse green tea and black tea consumption patterns, and to analyse the components that consideration the preferences of black tea and green tea consumers. Research was held in Southern Purwokerto Sub-district, started from February until March 2020. The number of samples for each black tea and green tea consumers are 50 respondents taken by using multistage random sampling. The analysis which is used is Descriptive Analysis and Factor Analysis. The results show that characteristics of black tea and green tea consumers are women in various range of age. Additionally, married consumers buy black tea and green tea to be consumed together with their family. Perspective of consumption patterns black tea and green tea once a day in the morning breakfast for black tea and in other activities for green tea. The consumption number for family is an average of 50g/months. There are three main components that form preferences on green tea, those are: personality from the tea, identity, and the image of the product. On the other hand, main components that form preferences on black tea are two, those are: image, and identity product.</em></p>

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D. S.G. G. C. Swarnathilake e Don Chandana Abeysinghe. "Improving the quality and the taste of green tea ice cream by identifying suitable cultivar, agronomic practices and processing techniques of Assamica tea grown in Sri Lanka". World Journal of Advanced Research and Reviews 8, n. 1 (30 ottobre 2020): 062–68. http://dx.doi.org/10.30574/wjarr.2020.8.1.0354.

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The objectives of this study were to find the most suitable tea cultivar, shading effect and best tea processing technique for production of green tea powder with low astringency and amount of green tea addition to produce ice cream with best flavor and medicinal values. Green tea powder was manufactured using five different cultivars i.e. TRI 2023, TRI 2026, TRI 2027, TRI 4042 and TRI 4047 grown under shaded and un-shaded conditions with three processing techniques namely; steaming, pan firing and freeze drying and green tea ice cream was prepared using processed green tea powder. To reveal the health benefits of green tea powder and green tea ice cream, total phenolic content (TPC) , total flavonoid content (TFC) and Total antioxidant capacity (TAC) were checked by using modified folin-ciocalteu method , colorimetric method and ferric reducing antioxidant power (FRAP) assay respectively. The best quality green tea in terms of colour and flavour can be produced from tea leaves of TRI 4047 cultivar which was cultivated under shaded conditions with freeze drying processing technique. In terms of colour and flavour, 15 g of green tea added for ice cream mixture (500 mL of milk, 125 mL of whipping cream and 150 g of sugar) is the most suitable amount to add for green tea ice cream preparation. Significantly, higher TAC, TPC and TFC in green tea ice cream when compared to normal ice cream (without green tea powder) indicating the importance of consuming value added green tea ice cream as a healthy food.

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Mello, Lucilene Dornelles, e Tiele Garcia Tunes. "INFLUENCE OF PERMANGANATE INDEX IN THE PARAMETERS AS TOTAL PHENOL CONTENT AND TOTAL ANTIOXIDANT ACTIVITY OF EXTRACTS OF CAMELLIA SINENSIS". International Journal of Pharmacy and Pharmaceutical Sciences 9, n. 8 (1 agosto 2017): 110. http://dx.doi.org/10.22159/ijpps.2017v9i8.19270.

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Objective: This study estimated the Permangante Index (IKMnO4) and evaluated its correlation with parameters as total phenols (FT) and total antioxidant activity (TAA) of commercial teas of Camellia sinensis, fermented, unfermented and blended with other plants.Methods: The aqueous extracts were prepared from commercial samples of green and black teas, green tea blended with lemon (Camellia sinensis with Citrus limonium), green tea blended with mint (Camellia sinensis with Mentha piperita), green tea blended with peach (Camellia sinensis with Prunus persica) and green tea blended with orange (Camellia sinensis with Citrus sinensis). The Permangante index was determined by titrating the tea extract with potassium permanganate solution according to AOAC method (AOAC, 1980) with modifications. The concentration of phenols in the extracts was determined by spectrophotometry according to the standard procedure of Folin-Ciocalteau. The antioxidant activity of the extracts was evaluated using the radical 1,1-diphenyl-2-picrylhydrazyl (DPPH) method. All the determinations were performed in triplicate, and the results presented as mean ± standard deviation (SD). The data were evaluated by univariate statistical analysis (ANOVA), F-test and mean test (Tukey´s test) for comparative results. Pearson’s correlation was used to measure the degree of linear correlation and the quantitative variables were from a normal population.Results: The results for Permanganate Index show a variation ranged from 0.40 to 0.80 mEq/l. The ANOVA analysis to IKMnO4 shown there is significant statistically difference at the 5% probability level (p < 0.05) between the types of tea as well as the amount of herb used to prepare the infusion. Therefore, it was observed that there significant contrast between tea extracts, the mixture of different plants in blended extracts as well as the tea manufacture process affect the polyphenols tannins content influencing the permanganate index parameter. Studies correlation shown strong correlations (r > 0.7) among the parameters. For the Camellia sinensis extracts the high correlations between IKMnO4 and TAA; FT and TAA demonstrates the suitability of the permanganate index in the evaluation of antioxidant activity.Conclusion: The results suggest that the Permanganate Index could be used for quality control of tea as an additional parameter.

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Jakubczyk, Karolina, Łukasz Łopusiewicz, Joanna Kika, Katarzyna Janda-Milczarek e Karolina Skonieczna-Żydecka. "Fermented Tea as a Food with Functional Value—Its Microbiological Profile, Antioxidant Potential and Phytochemical Composition". Foods 13, n. 1 (21 dicembre 2023): 50. http://dx.doi.org/10.3390/foods13010050.

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Kombucha is a fermented tea drink produced by a symbiotic culture of bacteria and yeast, known as SCOBY. Its base has traditionally been black tea, which has been recognized for its health-promoting properties, particularly its antioxidant activity based on its high content of pol-yphenolic compounds. A number of previous studies have demonstrated the equally favourable biochemical and phytochemical composition of green tea. The aim of this study was to analyse and compare the basic biochemical composition, microbiological composition and antioxidant properties of black and green tea-based Kombucha. The green tea-based Kombucha showed a quantitatively more abundant microbial composition (Lactic Acid Bacteria, Acetobacter sp., Yeast), a higher reducing potential (FRAP—4326.58 Fe(II)µM/L) and a higher content of total polyphenols (23.84 mg GAE/100 mL, reducing sugars (3212.00 mg/100 mL) as well as free amino acids (849.00 mg GLY/mL). Kombucha made from black tea, on the other hand, showed a higher anti-oxidant potential (1.17 Trolox (mM) TEAC), neutralising the DPPH radical at 94.33% and ABTS at 97.74%. It also had a higher level of acetic acid (0.08 g/100 mL). Green tea kombucha had a higher scavenging capacity of 90.6% for superoxide radical (O2−) and 69.28% for hydroxyl radical (·OH) than black tea kombucha. In the present study, both kombucha drinks tested were shown to be source of potent antioxidants. In addition, green tea, as a kombucha base, has proven to be as beneficial a raw material that will provide full nutritional and health-promoting values as traditional kombucha.

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Luo, Qiong, Jia-Rong Zhang, Hua-Bin Li, Ding-Tao Wu, Fang Geng, Harold Corke, Xin-Lin Wei e Ren-You Gan. "Green Extraction of Antioxidant Polyphenols from Green Tea (Camellia sinensis)". Antioxidants 9, n. 9 (25 agosto 2020): 785. http://dx.doi.org/10.3390/antiox9090785.

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In this study, the feasibility of improving the extraction yield of green tea antioxidant polyphenols by the combination of ultrasound-assisted extraction (UAE) and deep eutectic solvents (DESs) was investigated. Choline chloride (ChCl)-glycerol was selected as the best DES among 12 ChCl-based DESs to extract tea antioxidant polyphenols. Subsequently, the influences of extraction parameters on total phenolic content (TPC) values were investigated, and liquid/solid ratio, ultrasonic power, and ultrasonic time were optimized based on the response surface methodology. The optimal extraction conditions were a liquid to solid ratio of 36:1 (mL/g), ultrasonic power of 461.5 W, and ultrasonic time of 21 min, with the highest TPC value of 243 ± 7 mg gallic acid equivalent (mg GAE)/g dry weight (DW), which was 13% higher than that before optimization. In addition, under the optimal extraction conditions, tea polyphenolic extract exhibited higher antioxidant activity compared with conventional extraction methods. Four major catechins in the green tea extracts, including (−)-epicatechin (EC), (−)-epigallocatechin (EGC), (−)-epicatechin gallate (ECG) and (−)-epigallocatechin gallate (EGCG) were identified and quantified by high-performance liquid chromatography. In addition, scanning electron microscopy (SEM) analysis revealed that UAE-DES effectively disrupted the green tea leaf cells, thereby improving tea polyphenol yield. In summary, UAE-DES is an ideal green extraction method for the extraction of tea antioxidant polyphenols.

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Jung, Yun-Jung, So-Hyoung Jung e Hyun-Ju Jo. "Recognition of the Characteristics Related to Green Tea and Beverage Consumption in Adult Males by Body Mass Index". Korean Tea Society 28, n. 3 (30 settembre 2022): 39–47. http://dx.doi.org/10.29225/jkts.2022.28.3.39.

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This study sought to investigate the characteristics related to the consumption of green tea and beverages by adult males according to their body mass index. The characteristics examined included preference, taste, image, and perception of health efficacy according to the type of beverage consumed. Further, the variations in the characteristics related to beverage consumption according to the body mass index of the subjects were compared. The characteristics were assessed using a self-administered questionnaire rated on a five-point Likert scale. Adult males who usually consume green tea frequently had the highest preference scores for green tea. They also had a high recognition score for the premise that green tea helps to maintain health and assists in weight management. Participants who did not consume green tea had significantly lower preference, taste, and health efficacy scores than those who consumed green tea frequently (3∼4 times/week). The taste scores of green tea segregated according to the degree of obesity were significantly higher in the normal weight group than in the obese group. The health efficacy score of green tea and beverages was positively correlated with age and green tea intake. In conclusion, the normal weight group had a greater preference for the taste of green tea than the obese group. In addition, the higher the score on the preference and taste of green tea and the higher the perception that green tea helped improve health, the higher the consumption of green tea.

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Putri, Fika Melinda, Susi Susi e Desy Purnama Sari. "Pengaruh Berkumur Dengan Larutan Teh Hijau dan Teh Hitam Terhadap pH Saliva". Andalas Dental Journal 7, n. 1 (1 giugno 2019): 1–12. http://dx.doi.org/10.25077/adj.v7i1.129.

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The prevalence of caries in Indonesia has increased by 53.53% from 2013 to 2018. Low salivary pH (potential of Hydrogen) is one of the main causes of dental caries. Acid as metabolic product of oral microorganism can decrease the salivary pH. The purpose of this paper is to determine the effect of gargling with green and black tea solutions on salivary pH. The increasing of salivary pH linear to salivary secretion. Gargling with green tea or black tea is one of the ways that can increase salivary secretion and pH by provides a mechanical and chemical stimulus to the oral cavity. Green tea and black tea contain polyphenols (catechins) which can increase salivary pH. Conclusion is gargling with green tea and black tea solutions can add salivary pH. Gargling with green tea is more effective to increase salivary pH than black tea. Green tea has a higher catechins content than black tea, in order to anti-cariogenic and anti-bacterial properties are more common in green tea.

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Zhao, Tiantian, Chao Li, Shuai Wang e Xinqiang Song. "Green Tea (Camellia sinensis): A Review of Its Phytochemistry, Pharmacology, and Toxicology". Molecules 27, n. 12 (18 giugno 2022): 3909. http://dx.doi.org/10.3390/molecules27123909.

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Objectives Green tea (Camellia sinensis) is a kind of unfermented tea that retains the natural substance in fresh leaves to a great extent. It is regarded as the second most popular drink in the world besides water. In this paper, the phytochemistry, pharmacology, and toxicology of green tea are reviewed systematically and comprehensively. Key findings Green tea has been demonstrated to be good for human health. Nowadays, multiple pharmacologically active components have been isolated and identified from green tea, including tea polyphenols, alkaloids, amino acids, polysaccharides, and volatile components. Recent studies have demonstrated that green tea shows versatile pharmacological activities, such as antioxidant, anticancer, hypoglycemic, antibacterial, antiviral, and neuroprotective. Studies on the toxic effects of green tea extract and its main ingredients have also raised concerns including hepatotoxicity and DNA damage. Summary Green tea can be used to assist the treatment of diabetes, Alzheimer’s disease, oral cancer, and dermatitis. Consequently, green tea has shown promising practical prospects in health care and disease prevention.

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Prawira-Atmaja, Mukhammad Iqbal, Sugeng Haryanto, Hilman Maulana, Shabri Shabri e Dr Dadan Rohdiana. "Karakteritik sifat alir bubuk teh hijau yang diproses dengan metode penepung berbeda". Jurnal Sains Teh dan Kina 21, n. 2 (15 dicembre 2019): 85–95. http://dx.doi.org/10.22302/pptk.jur.jptk.v21i2.147.

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Recently, the public interest in green tea powder is increasing. Green tea powder is produced through the process stage: withering in hot steam, drying, and reducing size. The size reduction process on green tea powder is an important step because it will affect the characteristics of the powder flow properties. This study aims to determine the flow properties of green tea powder processed by different milling method. The milling method used are disc milling (DM) and stone milling (SM). Green tea powder was analyzed including moisture content, particle size distribution using dynamic laser scattering method, determined of bulk density (ρb), and tapped density (ρtap) to find out the Carr Index (CI) and Hausner Ratio (Hr). In addition, the lightness of color and shape and morphology of green tea powder were observed with SEM. The results showed that green tea powder produced from different milling methods have a Carr Index of 15 with “Good” flow properties. DM method produced darker green tea powder with L value (lightness) 49.91 and larger particle size (D50: 38.6 µm) compared with green tea powder produced by the SM method. Determination of flow properties of green tea powder can be applied for the utilization and development of food products and pharmaceutical products based on green tea powder.

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Sehgal, Amit, e ShaikhI Nasrul. "Antilithogenic potential of green tea, oolong tea, and black tea". Pharmacognosy Research 12, n. 1 (2020): 92. http://dx.doi.org/10.4103/pr.pr_67_19.

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Hu, Wenwen, Gege Wang, Shunxian Lin, Zhijun Liu, Peng Wang, Jiayu Li, Qi Zhang e Haibin He. "Digital Evaluation of Aroma Intensity and Odor Characteristics of Tea with Different Types—Based on OAV-Splitting Method". Foods 11, n. 15 (25 luglio 2022): 2204. http://dx.doi.org/10.3390/foods11152204.

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Aroma is one of the most important quality indicators of tea. However, this evaluation method is a subjective one. In this study, the volatiles of tea with 5 types were determined by headspace solid-phase micro-extraction (HS-SPME) combined with gas chromatography mass spectrometry (GC-MS). The aroma intensity and odor characteristics of teas were comparatively analyzed based on the OAV-splitting method. The results showed that OAV were green tea (492.02), red tea (471.88), oolong tea (302.74), white tea (68.10), and dark tea (55.98). The odor index I(o) indicated that green tea was strong-flavor tea with highlight green accompanied by fruity, woody and fatty odors; oolong tea was strong-flavor tea with fruity and fatty accompanied by woody, floral and green odors; red tea was strong-flavor tea with highlight fruity accompanied by woody, green and floral odors; white tea was a light-flavor tea with floral, woody and green odors; and dark tea was light-flavor tea with woody and floral notes accompanied by fatty and green odors. These results fitted perfectly with the people’s consensus on these teas, and proved that the OAV-splitting method is feasible to evaluate the aroma intensity and odor characteristics of tea aroma. We suggest that the digital evaluation of tea aroma can facilitate people’s communication.

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Nafisah, Umi, Aptika Oktaviana Trisna Dewi e Anes Aisna Hana Lulu. "Determination of Catechin Content in Green and Black Tea (Camellia sinensis L.) by UV-Vis Spectrophotometric Method". Jurnal Sains dan Kesehatan 6, n. 1 (29 febbraio 2024): 24–30. http://dx.doi.org/10.25026/jsk.v6i1.2166.

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Tea is one of the most commonly consumed beverages around the world. The chemical compounds contained in tea have a good effect on health because they contain polyphenolic compounds, catechins. This study examined the catechin compound content of black tea and green tea from Karanganyar (A) and Malang (B). This research aims to determine the differences in catechin levels in black and green tea types in Malang, East Java, and Karanganyar, Central Java plantations. The research method used was experimental. Identification of catechin content was done using UV-Vis Spectrophotometry method. Tea is extracted by brewing, 4 grams of green tea is brewed using distilled water for 6 minutes, while 5.6 grams of black tea is brewed using distilled water for 10 minutes with the comparison used is pure catechin solution. The results obtained for green tea Karanganyar (A) had a catechin content of 3.61±0.083%, green tea Malang (B) had a level of 2.97±0.037%, black tea Karanganyar (A) had a level of 3.14±0.065%, and black tea Malang (B) had a level of 1.60±0.009%. It is concluded that the catechin content of green tea is higher than black tea, and of the two samples, the high catechin content comes from Karanganyar (A). Keywords: catechins, green tea, black tea, malang, karanganyar

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Sudjatini, Sudjatini. "OPTIMASI EKSTRAKSI DAN PENENTUAN KANDUNGAN KATEKIN DALAM TEH HIJAU (Camellia sinensis) MENGGUNAKAN METODA HPLC". AGROTECH : JURNAL ILMIAH TEKNOLOGI PERTANIAN 2, n. 1 (5 febbraio 2019): 43–49. http://dx.doi.org/10.37631/agrotech.v2i1.8.

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This research was designed to determine the optimum period extraction time for catechin green tea using boiling water and ethyl acetate as a solubilizing agent, whereas the composition and the content of catechin green tea were measured using High Performance Liquid Chromatography (HPLC). A single factor experiment design was used. The period extraction time of green tea using boiling water and ethyl acetate were 5, 20, 35 and 60 minutes. The proportion of green tea at the extraction process was 1:15 (weight/volume). The extraction process using boiling water was done twice to get the maximum extracted catechin yield. The extracted catechin of green tea were, therefore, compared with epi-catechin as standard solution. The research’s results show that the optimum period for extraction time of green tea using boiling water and ethyl acetate were 35 and 20 minutes, respectively. The extracted green tea using boiling water was 41.39 % of its dry weight, and those extracted green tea contained catechin as high as 60.62-61.78 %. Catechin compound in green tea residues extracted using ethyl acetate was 5.31 % from 58.35 % the total green tea residues. The composition of catechin in the first boiling water extraction, the second boiling water extraction and pressure extraction consisted of epigallocatechin (EGC), epigallocatechin-gallat (EGCG), epicatechin (EC) and epicatechin-gallat (ECG). ECG was only found in green tea residue extracted using ethyl acetate. The total catechin compound in green tea extracted using boiling water and ethyl acetate was 27.73 % of dry weight, consisted of EGC, EGCG, EC and ECG were 14.74, 1.73, 8,35 and 2.91 % of green tea dry weight, respectively

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Srimanothip, Anjaly, e Phakkharawat Sittiprapaporn. "Electroencephalographical investigation of drinking green tea to the human brain". Asian Journal of Medical Sciences 11, n. 1 (1 gennaio 2020): 33–36. http://dx.doi.org/10.3126/ajms.v11i1.26530.

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Background: Nowadays green tea has become one of the most popular drinks all over the world. Evidences suggest that green tea become second most consumer following regular drinking water. Green tea contains Theanine, an amino acid primarily found in green tea and black tea. The content is generally found 1-2% of dried tea or around 60 milligrams per 200 milliliters of tea drink. In particular, this substance is found in the form of L-theanine that can be absorbed to the blood system and then to the brain within 30 minutes, which causes relaxation and reducing stress. Aims and Objective: The objective was to examine the effect of green tea consumption on electroencephalographic (EEG) activities. Materials and Methods: This study was an experimental design. The participants were twelve Thai healthy, aged between 21-55 years old. During the experiment, all participants were asked to drink green tea every 10 minutes. Results: The influence to brainwave and attentive process were tested by experimental design. The study indicated that alpha brainwave was shown after drinking green tea. Frequency of alpha brainwave along cumulative drinking of green tea was shown significantly since the 10th minute. However, spectrum of the alpha brainwave changed significantly after drinking green tea, after 30th minutes. Conclusion: The benefit of this study was to provide the guideline for planning and campaigning green tea consumption for the purpose of stress reduction resulting in relaxation.

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Kurczoba, Beata. "Green tea for beauty". Journal of Face Aesthetics 1, n. 1 (10 ottobre 2018): 51–56. http://dx.doi.org/10.20883/jofa.5.

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Green tea has long been in demand because of its health‑related properties. It is thanks to its catechins belonging to the group of polyphenols, which have a strong antioxidant effect. Among the catechins contained in the infusion of green tea, the key role is played by EGCG, which content is 48–59%. Green tea has anticancer, anti‑atherosclerotic, anti‑inflammatory, anti‑bacterial and anti‑aging properties. In cosmetology it is used among many cosmetics that improve the appearance of skin.

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Kawano, Tetsuya, Hiroto Matsuse, Susumu Fukahori, Tomoko Tsuchida, Chizu Fukushima e Shigeru Kohno. "Green Tea Induced Asthma". Nihon Naika Gakkai Zasshi 98, n. 4 (2009): 866–67. http://dx.doi.org/10.2169/naika.98.866.

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Ali Hassan, Shaik, Sumit Bhateja, Geetika Arora e Francis Prathyusha. "Green tea in dentistry". IP Journal of Nutrition, Metabolism and Health Science 3, n. 2 (15 agosto 2020): 41–44. http://dx.doi.org/10.18231/j.ijnmhs.2020.009.

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41

&NA;. "Green tea/statins interaction". Reactions Weekly &NA;, n. 1221 (settembre 2008): 16–17. http://dx.doi.org/10.2165/00128415-200812210-00045.

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TACHIBANA, Hirofumi. "Green tea polyphenol sensing". Proceedings of the Japan Academy, Series B 87, n. 3 (2011): 66–80. http://dx.doi.org/10.2183/pjab.87.66.

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Muñoz-López, F. "Green tea for everything?" Allergologia et Immunopathologia 32, n. 1 (1 gennaio 2004): 1–3. http://dx.doi.org/10.1157/13057761.

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Rouzer, Carol A., e Lawrence J. Marnett. "Green Tea Gets Molecular". Cancer Prevention Research 4, n. 9 (settembre 2011): 1343–45. http://dx.doi.org/10.1158/1940-6207.capr-11-0372.

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45

Sinija, V. R., e H. N. Mishra. "Green tea: Health benefits". Journal of Nutritional & Environmental Medicine 17, n. 4 (gennaio 2008): 232–42. http://dx.doi.org/10.1080/13590840802518785.

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46

Heiss, Mary Lou. "Chinese Spring Green Tea". Gastronomica 1, n. 2 (2001): 80–83. http://dx.doi.org/10.1525/gfc.2001.1.2.80.

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Johnson, Ian T. "Green tea and cancer". Lancet Oncology 11, n. 6 (giugno 2010): 519–20. http://dx.doi.org/10.1016/s1470-2045(10)70140-6.

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Chotai, Neil, Katy Edmonds e Baljit Dheansa. "More green tea vicar?" Burns 39, n. 7 (novembre 2013): 1498. http://dx.doi.org/10.1016/j.burns.2013.05.014.

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Muñoz-López, F. "Green tea for everything?" Allergologia et Immunopathologia 32, n. 1 (gennaio 2004): 1–3. http://dx.doi.org/10.1016/s0301-0546(04)79214-9.

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Pérez-Burillo, Sergio, Beatriz Navajas-Porras, Alicia López-Maldonado, Daniel Hinojosa-Nogueira, Silvia Pastoriza e José Ángel Rufián-Henares. "Green Tea and Its Relation to Human Gut Microbiome". Molecules 26, n. 13 (26 giugno 2021): 3907. http://dx.doi.org/10.3390/molecules26133907.

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Abstract (sommario):

Green tea can influence the gut microbiota by either stimulating the growth of specific species or by hindering the development of detrimental ones. At the same time, gut bacteria can metabolize green tea compounds and produce smaller bioactive molecules. Accordingly, green tea benefits could be due to beneficial bacteria or to microbial bioactive metabolites. Therefore, the gut microbiota is likely to act as middle man for, at least, some of the green tea benefits on health. Many health promoting effects of green tea seems to be related to the inter-relation between green tea and gut microbiota. Green tea has proven to be able to correct the microbial dysbiosis that appears during several conditions such as obesity or cancer. On the other hand, tea compounds influence the growth of bacterial species involved in inflammatory processes such as the release of LPS or the modulation of IL production; thus, influencing the development of different chronic diseases. There are many studies trying to link either green tea or green tea phenolic compounds to health benefits via gut microbiota. In this review, we tried to summarize the most recent research in the area.

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