• Green Tea Roasting and Extraction
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  • Release time: 2022-04-20
  • roasting process
  • microwave-assisted extraction
  • green tea extracts
Video Introduction

The aim of this video was to investigate the catechin levels and antioxidant activities as manipulated by roasting temperature and roasting time of green tea. Roasting temperature and time varied between 100–300 °C and 60–240 s in green tea production. The main interactions measured were effects on the antioxidant activities, total phenolic content, DPPH, ABTS, FRAP and catechin content (catechin (C), epigallocatechin gallate (EGCG), epigallocatechin (EGC), epicatechin gallate (ECG) and epicatechin (EC)). Optimum roasting conditions were determined as 270 °C for 240 s, since this enabled high catechin contents, antioxidant activities and production yield. The extraction methods for green tea including traditional extraction (TDE), microwave-assisted extraction (MAE) and ultrasonic-assisted extraction (UAE) using 60% ethanol as solvent were investigated to evaluate the highest bioactive compound and yield of extraction. MAE was found to be more efficient in green tea extraction compared to UAE and TDE. The extracts showed significant cytotoxic potential against the Huh-7 cell line, in concentrations ranging from 31.25 to 1000 µg/mL.

This video is adapted from 10.3390/horticulturae8040338

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Singh, K.; Srichairatanakool, S.; Chewonarin, T.; Brennan, C.; Brennan, M.; Utama-Ang, N. Green Tea Roasting and Extraction. Encyclopedia. Available online: https://encyclopedia.pub/video/video_detail/291 (accessed on 29 June 2022).
Singh K, Srichairatanakool S, Chewonarin T, Brennan C, Brennan M, Utama-Ang N. Green Tea Roasting and Extraction. Encyclopedia. Available at: https://encyclopedia.pub/video/video_detail/291. Accessed June 29, 2022.
Singh, Kanjana, Somdet Srichairatanakool, Teera Chewonarin, Charles Brennan, Margaret Brennan, Niramon Utama-Ang. "Green Tea Roasting and Extraction," Encyclopedia, https://encyclopedia.pub/video/video_detail/291 (accessed June 29, 2022).
Singh, K., Srichairatanakool, S., Chewonarin, T., Brennan, C., Brennan, M., & Utama-Ang, N. (2022, April 20). Green Tea Roasting and Extraction. In Encyclopedia. https://encyclopedia.pub/video/video_detail/291
Singh, Kanjana, et al. ''Green Tea Roasting and Extraction.'' Encyclopedia. Web. 20 April, 2022.
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