Catechin and Caffeine Content of Green Tea Dietary Supplements and Correlation with Antioxidant Capacity

2006 ◽  
Vol 54 (5) ◽  
pp. 1599-1603 ◽  
Author(s):  
Navindra P. Seeram ◽  
Susanne M. Henning ◽  
Yantao Niu ◽  
Rupo Lee ◽  
H. Samuel Scheuller ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Dietary Supplements ◽  
Green Tea ◽  
Caffeine Content

scholarly journals Estimation of carotinoid, antioxidant, and oxidant statusby biophotonic scanning in healthy and sick persons with risk factorsof atherosclerosis

2007 ◽  
Vol 6 (4) ◽  
pp. 31-36
Author(s):  
V. N. Kim ◽  
G. V. Krivulina ◽  
V. M. Shevelyev ◽  
T. Ye. Suslova ◽  
O. V. Gruzdeva ◽  
...  
Keyword(s):  
Cardiovascular Diseases ◽  
Antioxidant Capacity ◽  
Dietary Supplements ◽  
Total Antioxidant Capacity ◽  
Antioxidant Status ◽  
High Accuracy ◽  
Cardiovascular Risks ◽  
Total Antioxidant ◽  
Healthy Persons

High accuracy of biophotonic scanning in estimation of skin carotinoid score (SCS) and antioxidant status after 8-week period of correction by LifePak, MarineOmega, and Tegreen97 active dietary supplements is proved in 45 healthy persons with cardiovascular risks and in patients with cardiovascular diseases. SCS increased by 42.8% (p = 0.005) and total antioxidant capacity of blood (TAC) increased by 36.4% (p = 0.005) in health people; while in patients SCS increased by 47.4% (p = 0.001) and TAC increased by 30.3% (p = 0.008). The SCS accuracy in estimation of antioxidant status was 87%.

scholarly journals Green Tea Daily Consume Reduced Free Radicals on Moderate Smokers

2018 ◽  
Vol 2 (2) ◽  
pp. 39
Author(s):  
Rosyanne Kushargina ◽  
Rimbawan Rimbawan ◽  
Budi Setiawan
Keyword(s):  
Free Radicals ◽  
Experimental Design ◽  
Antioxidant Capacity ◽  
Green Tea ◽  
Black Tea ◽  
Intervention Period ◽  
Tea Leaves ◽  
Positive Effects ◽  
Tea Infusions ◽  
Total Antioxidant

<p><em>Smoking </em><em>can </em><em>enhance </em><em>free radicals on blood plasma. Many previous studies proved that tea is a source of antioxidants which might reduce free radicals. Green tea is known to have the higher antioxidant capacity compared to </em><em>black tea</em><em>.</em><em> This study aim</em><em>s </em><em>to analyze the effect </em><em>of green tea on reduction of free radicals on moderate smokers</em><em>, using a pre-post experimental design. </em><em>Green tea infusions were prepared with commercially available dried tea leaves (Green Tea Gamboeng Series) from the </em><em>Research</em><em> </em><em>Centers of Tea</em><em> </em><em>and</em><em> </em><em>Cinchona</em><em> Gambung, West Java. </em><em>Nine moderate smokers (11-21 cig/day) aged 30-45 years were instructed to drink 200 ml green tea three times a day for </em><em>four</em><em> weeks. Total Antioxidant Capacity (TAC) of blood serum was measured at baseline and after four weeks intervention period. The level of TAC significantly increased from 1.18 m mol/L to 1.34 m mol/L after </em><em>four</em><em> weeks intervention (P=0.000). These results prove that drinking 200 ml of green tea </em><em>three</em><em> times a day for </em><em>four</em><em> weeks has a significant benefit reduc</em><em>ing f</em><em>ree radicals of moderate smokers. Moderate smokers are advised to consume green tea continuously to sustain these positive effects.</em><em></em></p>

Green Tea Dietary Supplements

2013 ◽  
pp. 247-256 ◽  
Author(s):  
David J. Weiss ◽  
Sarah A. Gehrke ◽  
Pengxin Liu ◽  
Randy J. Robinson
Keyword(s):  
Dietary Supplements ◽  
Green Tea

scholarly journals A Non-targeted Approach to Chemical Discrimination Between Green Tea Dietary Supplements and Green Tea Leaves by HPLC/MS

2011 ◽  
Vol 94 (2) ◽  
pp. 487-497 ◽  
Author(s):  
Jianghao Sun ◽  
Pei Chen ◽  
Long-Ze Lin ◽  
James M Harnly
Keyword(s):  
Dietary Supplements ◽  
Green Tea ◽  
Similarity Coefficients ◽  
Tea Leaves ◽  
Liquid Form ◽  
Epicatechin Gallate ◽  
Accurate Mass Measurements ◽  
Chemical Discrimination ◽  
Green Tea Leaves ◽  
Solid Form

Abstract Green tea-based dietary supplements (GTDSs) have gained popularity in the U.S. market in recent years. This study evaluated the phytochemical composition difference of GTDS in comparison with green tea leaves using an HPLC/MS fingerprinting technique coupled with chemometric analysis. Five components that are most responsible for class separation among samples were identified as (-) epicatechin gallate, strictinin, trigalloylglucose, quercetin-3-O-glucosylrhamnosylglucoside, and kaempferol-3-O-galactosyl-rhamnosylglucoside, according to the accurate mass measurements and MS/MS data. The similarity coefficients between the GTDSs in solid form with green tea were 0.55 to 0.91, while for the GTDSs in liquid form they were 0.12 to 0.89, which suggested that chemical composition variance across the GTDSs was significant. Flavonol aglycone concentrations were higher in GTDSs than in tea leaves, indicating the degradation of flavonol glycosides or the oxidation of catechin during the manufacturing and storage processes. In some GTDS samples, compounds were identified that were on the label. The results demonstrate the urgency of QC for GTDS products.

scholarly journals Content of Caffeine and Catechins Measured in Multi-ingredient Dietary Supplements Containing Green Tea: Association with Label Claims and Proprietary Blends

2020 ◽  
Vol 4 (Supplement_2) ◽  
pp. 1375-1375
Author(s):  
Karen Andrews ◽  
Pavel Gusev ◽  
Phuong-Tan Tey ◽  
Sushma Savarala ◽  
Laura Oh ◽  
...  
Keyword(s):  
Dietary Supplements ◽  
Green Tea ◽  
Epigallocatechin Gallate ◽  
Standard Errors ◽  
Phytochemical Content ◽  
Funding Sources ◽  
Actual Content ◽  
Label Information ◽  
Label Claim ◽  
Leaf Powder

Abstract Objectives Multi-ingredient dietary supplements (DSs) containing green tea (GT) were analyzed for their phytochemical content (seven catechins and caffeine) as part of a Dietary Supplement Ingredient Database project. The label information required by FDA is the weight of the GT extract or leaf powder, unless it is part of a proprietary blend (only the blend weight needed). Any information about the concentration of GT phytochemicals is voluntary. We assessed the accuracy of the mandatory and voluntary portions of labels and the effect of proprietary blends on the phytochemical content. Methods Two lots of 37 GT DSs, estimated to contain ≥40 mg/serving of GT, were purchased in a variety of market channels. Samples were sent for analysis to two experienced laboratories. Means and standard errors for the analytically measured content of epigallocatechin gallate (EGCG; the most prevalent catechin), the summed content of the catechins (total catechins, TC), and caffeine were derived for each DS and compared to label information. Results The measured content of EGCG, TC, and caffeine showed wide ranges (0 (not detected) - 442, 0–711, and 0–982 mg/day, respectively). DSs with concentration claims for EGCG and caffeine (32% and 43%, respectively) had higher content per serving compared to DSs without such information (P &lt; 0.05). Most DSs with voluntary claims for EGCG, TC or caffeine content (74%) had actual content within ± 20% of the labels. The catechin content was not significantly different in DSs with GT amounts listed on the label (n = 20) compared with DSs listing GT as part of a proprietary blend (n = 17). However, DSs with GT in a blend had significantly more caffeine than those with a label claim for GT amount (means (SE) per day 197 (63) vs. 49 (18), respectively; P = 0.037). Conclusions The actual content of GT constituents such as EGCG, TC and caffeine in multi-ingredient GT DSs varied depending on the labeling formats. DSs with a voluntary label claim for EGCG had significantly higher EGCG content than those with only the required claims. DSs with GT listed as a part of a blend had significantly higher levels of caffeine than products with labeled GT amounts. More complete label information would be beneficial both for consumers and for researchers who track phytochemical intakes and their associations with health outcomes. Funding Sources NIH/ODS and USDA/ARS.

scholarly journals Phytochemicals and Quality of Green and Black Teas from Different Clones of Tea Plant

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yadav KC ◽  
Ashok Parajuli ◽  
Bishnu Bahadur Khatri ◽  
Lila Devi Shiwakoti
Keyword(s):  
Antioxidant Activity ◽  
Green Tea ◽  
Antioxidant Properties ◽  
Water Extract ◽  
Black Tea ◽  
Tea Plant ◽  
Total Quality ◽  
Dry Extract ◽  
Caffeine Content ◽  
Tea Plants

Tea is a popular drink with refreshing and functional properties. Bud, 1st leaf, and 2nd leaf of five varieties of tea clones (Gumti Takda-78, Ambari, Chiniya, and Tinali, which are popular in tea plantation area of Nepal) were collected and used for preparing green and orthodox black tea to study antioxidant activity, phytochemicals profile, chemical content, and sensory parameters. One or two leaves were hand-plucked from each bush to get a sample of about 100 leaves and processed for green and orthodox black tea for different clones of tea plants. Phytochemicals, antioxidant activity, and caffeine content were found higher in bud followed by 1st leaf and 2nd leaf for all clones of tea plants. Both types of tea (green and black) from Gumti were significantly (p<0.05) higher having tannin content, flavonoid content, total polyphenol content, caffeine content, and IC50 value of 49.15 and 36.23 (mg GAE/g dry extract), 358.9 and 350.4 (mg QE/g dry extract), 590.5 and 570 (mg GAE/g dry extract), 2.85 and 2.94%, and 45.15 & 51.88 μg/mL, respectively. Green and orthodox tea from Takda-78 was found higher in caffeine content and the least in Tinali for both types of tea. Moisture, water extract, total ash, acid-insoluble ash, and crude fiber content in tea (green and black) from Gumti were found to be 5.4% & 5.37%, 65.89% & 71.46%, 5.524% & 6.52%, 0.46% & 0.57%, and 7.96% & 10.27%, respectively. The ratio of theaflavin and thearubigin (TF : TR) was found 1 : 8.61, 1 : 9.36, 1 : 9.70, 1 : 12.87, and 1 : 6.36 in Takda-78, Ambari, Gumti, Chiniya, and Tinali respectively. The total quality score in green tea (85.13%) and black tea (85.78%) from Gumti was significantly higher than others. Phytochemicals and antioxidant properties of green tea were significantly (p<0.05) higher than those of orthodox black tea for all clones of tea plant. This study suggests Gumti variety to be used in green and orthodox black tea processing for higher phytochemical, chemical, sensory quality, and antioxidant activity.

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