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<p>Tea, from <i>Camellia sinensis</i>, is second only to water in global consumption. Tea germplasm in Sri Lanka consists of over 600 tea cultivars, and currently, 70 of them are recommended for commercial tea cultivation. However, the biological activities of Sri Lankan tea cultivars have not been documented. The present study investigated the in vitro enzyme inhibitory activities, viz., lipase, α-amylase, xanthine oxidase, α-glucosidase, and acetylcholinesterase, as well as antioxidant activity in black tea and tea leaves harvested from 15 different tea cultivars during the major seasons in Sri Lanka. The remarkable α-glucosidase, xanthine oxidase, and acetylcholinesterase inhibitory activities in black tea and tea leaves of tea cultivars were observed, with the IC<sub>50</sub> of black tea ranging from 5.77 to 104.10&#xa0;ppm, 0.55 to 36.75&#xa0;ppm, and 28.37 to 184.06&#xa0;ppm, respectively. Additionally, some tea cultivars have exhibited moderate α-amylase and lipase inhibitory activities. The radical scavenging activities of DPPH (1,1-diphenyl-2-picrylhydrazyl) and nitric oxide on black tea and tea leaves were&#xa0;exhibited with the IC<sub>50</sub> of black tea ranging from 14.03–67.23&#xa0;ppm and 76.22 to 251.35&#xa0;ppm, respectively.</p>

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Evaluation of antioxidant, acetylcholinesterase, lipase, α-amylase, xanthine oxidase, and α-glucosidase enzyme inhibitory activities of Sri Lankan tea cultivars

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  • 发表日期：

    2025年2月25日

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  • K. G. Nelum P. Piyasena,
  • M. A. B. Ranatunga,
  • M. T. Napagoda,
  • N. R. Amarasinghe,
  • A. A. B. Abayarathne,
  • L. Jayasinghe

摘要

Tea, from Camellia sinensis, is second only to water in global consumption. Tea germplasm in Sri Lanka consists of over 600 tea cultivars, and currently, 70 of them are recommended for commercial tea cultivation. However, the biological activities of Sri Lankan tea cultivars have not been documented. The present study investigated the in vitro enzyme inhibitory activities, viz., lipase, α-amylase, xanthine oxidase, α-glucosidase, and acetylcholinesterase, as well as antioxidant activity in black tea and tea leaves harvested from 15 different tea cultivars during the major seasons in Sri Lanka. The remarkable α-glucosidase, xanthine oxidase, and acetylcholinesterase inhibitory activities in black tea and tea leaves of tea cultivars were observed, with the IC50 of black tea ranging from 5.77 to 104.10 ppm, 0.55 to 36.75 ppm, and 28.37 to 184.06 ppm, respectively. Additionally, some tea cultivars have exhibited moderate α-amylase and lipase inhibitory activities. The radical scavenging activities of DPPH (1,1-diphenyl-2-picrylhydrazyl) and nitric oxide on black tea and tea leaves were exhibited with the IC50 of black tea ranging from 14.03–67.23 ppm and 76.22 to 251.35 ppm, respectively.