Green Tea Leaves Extract with Low Concentration of EGCG Can Provide Health Benefits without Causing Renal Damage

Das, D. and Tamuly, S. and Das Purkayastha, M. and Dutta, B. and Barman, C. and Kalita, D. J. and Boro, R. and Agarwal, S. (2021) Green Tea Leaves Extract with Low Concentration of EGCG Can Provide Health Benefits without Causing Renal Damage. ACTA ALIMENTARIA: AN INTERNATIONAL JOURNAL OF FOOD SCIENCE, 50 (3). pp. 369-382. ISSN 0139-3006 (print); 1588-2535 (online)

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Abstract

Green tea or its concentrated extract is coveted for its health promoting catechin-like polyphenols, especially epigallocatechin-3-gallate (EGCG). However, its amicable efficacy is now being doubted considering the recent occurrence of several cases of hepato- and nephrotoxicity, after the ingestion of EGCG-fortified (≥85–90%) nutritional supplements. Therefore, the current study was carried out to ascertain the effect of green tea leaves extract (GTE), having low EGCG content (73.8%), on liver and kidney functions of male Wistar rats using various in vivo experiments and in vitro radical scavenging activity. In terms of acute toxicity, GTE was observed to be safe when delivered at a dosage of 2000 mg kg-1 body weight (BW). Oral delivery of GTE for 28 days at a concentration of 200 mg kg-1 BW/day did not trigger sub-acute toxicity to the liver and kidneys, as per serum biochemical analyses and histopathological examination. In contrast, GTE counteracted the effects of carbon tetrachloride (a potent hepato-degenerative compound) on the liver. Furthermore, increase in high-density lipoprotein-cholesterol with concomitant lowering of serum triglycerides and low-density lipoprotein-cholesterol were noticed in GTE-treated rats. These findings suggest that low EGCG containing GTE, with appreciable antioxidant activity (IC50 = 53.18–71.28 µgmL-1), can serve as a hepatoprotective, hypolipidemic, and hypocholesterolemic ingredient.

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