01) elevation of ALAD, GSH, GPx, SOD, and nitrate/nitrite levels and reduction of the TBARS level and tissue burden when compared to detannified green tea fraction (GTDT)-treated groups. Green tea crude fraction (GTC) co-treated with sodium arsenite for 28 days caused significant (p <. The tissue arsenic burden was increased after arsenic exposure for a period of 28 days.
Administration of sodium arsenite (100 mg/kg/day) for 28 days in Sprague Dawley female rats resulted in significant reduction of biochemical parameters such as delta-aminolevulinic acid dehydratase (ALAD), reduced glutathione (GSH), glutathione peroxidase (GPx), superoxide dismutase (SOD) and elevation of thiobarbituric acid reactive substances (TBARS) and the index of nitrite/nitrate (NOx) levels. However, the possible role of tannins in green tea in alleviating hepatic and renal oxidative injury has also been studied. The concentration of cadmium in soil significantly and negatively correlated with chlorophyll content, photosynthetic rate, transpiration rate and biomass production of tea plants.The protective effect of green tea (Camellia sinensis) was tested against arsenic-induced toxicity. When tea plants were grown on polluted soils simulated by adding salts of these two metals, feeding roots possibly acted as a buffer and defense, and arsenic and cadmium were transported less to the above-ground parts. Distribution of arsenic and cadmium, based on their concentrations of unit dry matter, in tea plants grown on un-contaminated soil was in the order: feeding roots>stems approximately main roots>old leaves>young leaves. Most arsenic and cadmium absorbed were fixed in feeding roots and only small amount was transported to the above-ground parts.
In this study, by field investigation and pot trial, we found that mobility of arsenic and cadmium in tea plants was low. It is important to research the rules about accumulation and distribution of arsenic and cadmium by tea plants, which will give us some scientific ideas about how to control the contents of arsenic and cadmium in tea.
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