| |
Comparison of the nutrient and chemical contents of traditional Korean Chungtaejeon and green teas.
Park YS, et al
Department of Horticultural Science, College of Natural Science, Mokpo National University, Muan, 534-729, South Korea.
Plant Foods Hum Nutr.
2010 Jun;65(2):186-91.
Abstract
This study was conducted in order to compare the nutrient and chemical contents of two Korean teas: traditional Chungtaejeon tea (CTJ) with that of green tea (GT).
Main bioactive compounds and the antioxidant activities using four radical scavenging assays (ABTS, CUPRAC, FRAP and DPPH) in methanol and acetone extracts of both teas were determined. It was found that the contents of vitamin C, amino acids and total nitrogen in CTJ were lower than that of GT (p < 0.05).
Caffeine, reducing sugar and chlorophyll contents in CTJ were similar to GT.
Catechin (C), epicatechin (EC), and epigallocatechin (EGC) contents were lower in CTJ than in green tea (p < 0.05), but gallocatechin (GC), epicatechin gallate (ECG), epigallocatechin gallate (EGCG) and catechin gallate (CG) showed no significant differences between CTJ and GT (p >/= 0.05).
The contents of polyphenols, flavonoids, flavanols and tannins in CTJ methanol were 229.30 +/- 11.3 mg GAE/g dry weight (DW), 15.24 +/- 0.8 mg CE/g DW, 109.10 +/- 5.1 mg CE/g DW and 25.68 +/- 1.2 mg CE/g DW, respectively, and significantly higher than in acetone extracts (p < 0.05). Flavonoids (quercetin and kaempferol) were higher in GT than in CTJ and myricetin was higher in CTJ (p < 0.05). Threonine and aspartic acid was lower, and glutamic acid was higher in CTJ compared with GT (p < 0.05). Free amino acid content in CTJ and GT showed no significant difference. Potassium and magnesium in CTJ were lower compared to GT, but no significant difference was found for iron, manganese and calcium.
Also, the level of the antioxidant activity by all four used assays was significantly higher in CTJ and in methanol was higher than in acetone extracts (p < 0.05).
In conclusion, traditional fermented Korean tea Chungtaejeon contains high quantities of bioactive compounds and possesses high antioxidant activity.
The contents of the bioactive compounds and the levels of antioxidant activities are significantly higher in methanol than in acetone extracts. 3-D fluorescence and FTIR- spectroscopy showed slight differences between the two investigated tea samples and can be used as additional tools for identification of polyphenols.
Both studied teas can be recommended as a source of bioactive compounds.
Please visit the Google Tea Advertisers. Thank you!
|
In the Media on Tea!
Kombucha is steeped in controversy
The fermented tea drink looks like 'probiotic' health food to some, moldy risk to others
By Laura Vozzella
The Baltimore Sun
June 23, 2010
Herbal teas, including all the teas discussed in these pages, should not be consumed by persons who are pregnant or nursing, unless approved by your health care provider. Herbal teas may vary in their ingredients and some herbal tea components may interfere with other important medications. For example, there is some concern that green tea ingestion during pregnancy may reduce the absorption of folate, an important nutrient in fetal nervous system development.
keywords and tags:
tea, green tea, natural tea, red tea, african tea, white tea, chinese tea, black tea, tea benefits, green tea skin care products,green tea and weight loss, Chamomile Tea, herbal teas, mint tea, oolong tea, natural tea news, black dragon tea, hibiscus tea, new tea products, unsweetened tea, tazo tea, Pu-ehr tea, Earl Grey Tea,
Masala Indian Spiced Tea, Moroccan Tea, Mint Tea, Lemongrass Tea, Yerba Tea, Kombucha Tea
|
|
|
Learn about
Green Tea
Black Tea
Herbal Teas Pu-ehr Tea
Red Tea Chamomile Tea
Raspberry Tea |
White Tea
Tea Skin Care Products
At AllNaturalTea.com |
|
|
