Abstract
Selenium-enriched tea was suggested as a possible source of supplemental Se. The result of this study indicates that it is not practicable to make selenium-enriched tea as a beverage like traditional green tea or black tea for the supplementation of selenium in human diet. The selenium dispersibilities of fresh tea leaves, green tea, and black tea highly correlated with those of protein (r 2 = 0.998). The high protein dispersibility (85.0%) of fresh tea leaves in water solution was accompanied by that of selenium (93.8%). Decreases in protein dispersibility of green tea and black tea to 2.5% and 4.2 % coincided with those of selenium to only 8.3% and 10.1%, respectively. The amount (14.90 μg) of selenium in saturated ammonium sulphate (a protein precipitating reagent) precipitate was 83.8% of that (17.79 μg) in fresh tea leaf extract, and after the saturated ammonium sulphate precipitate was dialyzed against distilled water overnight, the amount (14.37 μg) of selenium remaining in the dialyzed precipitate (protein) was still 80.8% of that in the fresh tea leaf extract. However, there were no significant differences (p > 0.05) between the amount of selenium in the saturated ammonium sulphate precipitate and that in the saturated ammonium sulphate precipitate that was dialyzed.
References
Hu Q, Xu J, Pang G (2003) Effect of selenium on the yield and quality of green tea leaves harvested in early spring. J Agric Food Chem 51(11):3379–3381
Huang Y, Xu J, Hu Q (2005) Effect of selenium on preservation quality of green tea during autumn tea-processing season. J Agric Food Chem 53(19):7444–7447
Xu J, Zhu S, Yang F et al (2003) The influence of selenium on the antioxidant activity of green tea. J Sci Food Agric 83(5):451–455
Amantana A, Santana-Rios G, Butler JA et al (2002) Antimutagenic activity of selenium-enriched green tea toward the heterocyclic amine 2-amino-3-methylimidazo [4, 5-f] quinoline. Biol Trace Elem Res 86(2):177–191
Li H, Li F, Yang F et al (2008) Size effect of Se-enriched green tea particles on in vitro antioxidant and antitumor activities. J Agric Food Chem 56(12):4529–4533
Hu Q, Pan G, An X et al (2001) Physiological function of Se-enriched tea fertilised with sodium selenite and naturally high-Se tea in rats. J Sci Food Agric 81(2):202–204
Xu J, Yang F, An X et al (2007) Anticarcinogenic activity of selenium-enriched green tea extracts in vivo. J Agric Food Chem 55(13):5349–5353
Xu J, Zhou J, Sheng J et al (2008) Inhibition of cyclophoshamide-induced mutagenicity by microsized powder of selenium-enriched green tea in mice. J Agric Food Chem 56(10):3869–3875
Yu F, Sheng J, Xu J et al (2007) Antioxidant activities of crude tea polyphenols, polysaccharides and proteins of selenium-enriched tea and regular green tea. Eur Food Res Technol 225:843–848
Hu Q (2008) Size effect of se-enriched green tea particles on in vitro antioxidant and antitumor activities. J Agric Food Chem 56(12):4529–4533
Hahn MH, Kuennen RW, Caruso JA et al (1981) Determination of trace amounts of selenium in corn, lettuce, potatoes, soybeans, and wheat by hydride generation/condensation and flame atomic absorption spectrometry. J Agric Food Chem 29:792–796
Fadhil S, Reza MH, Rouhollah G et al (2007) Spectrophotometric determination of total alkaloids in Peganum harmala l. using bromocresol green. Res J Phytochem 1(2):79–82
Cuderman P, Kreft I, Germ M et al (2008) Selenium species in selenium-enriched and drought-exposed potatoes. J Agric Food Chem 56(19):9114–9120
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Wu, W., Long, X. Correlation of Dispersibility of Proteins with that of Selenium in Teas. Biol Trace Elem Res 142, 137–142 (2011). https://doi.org/10.1007/s12011-010-8753-7
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DOI: https://doi.org/10.1007/s12011-010-8753-7