Improving the extraction of catechins of green tea (Camellia sinensis) by subcritical water extraction (swe) combined with pulsed electric field (pef) or intense pulsed light (ipl) pretreatment

Hee Jeong Hwang, Yu Gyeong Kim, Myong Soo Chung

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The aim of this study was to find the optimum condition of pulsed electric field (PEF) and intense pulsed light (IPL) for the enhancement of subcritical water extraction (SWE), which is an eco-friendly extraction method, for extracting tea catechins from green tea leaves (Camellia sinensis). The leaves were treated with PEF under conditions of electric field strength (1, 2 and 3 kV/cm) during 60 s. Moreover, IPL was applied at various voltages (800, 1000, and 1200 V) for 60 s. The SWE was performed for 5 min at varying temperatures (110, 130, 150, 170, and 190C). The maximum yield of total catechin was 44.35 ± 2.00 mg/g dry green tea leaves at PEF treatment conditions of 2 kV/cm during 60 s, as well as the SWE temperature of 130C. In the case of IPL treatment, the largest amount of total catechin was 48.06 ± 5.03 mg/g dry green tea leaves at 800 V during 60 s when the extraction temperature was 130C. The total catechin content was increased by 15.43% for PEF and 25.09% for IPL compared to the value of untreated leaves. This study verified that PEF and IPL had a positive effect on the enhancement of tea catechins extraction from green tea leaves using SWE.

Original languageEnglish
Article number3092
JournalFoods
Volume10
Issue number12
DOIs
StatePublished - Dec 2021

Bibliographical note

Funding Information:
This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2019R1A2C1085100), and the Cooperative Research Program for Agriculture Science and Technology Development (Project No. PJ01602001) provided by the Rural Development Administration, Republic of Korea.

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • Green tea
  • Intense pulsed light
  • Pulsed electric field
  • Subcritical water extraction
  • Tea catechins

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