Extraction characteristics of subcritical water depending on the number of hydroxyl group in flavonols

Chan Ick Cheigh, Seo Yeon Yoo, Min Jung Ko, Pahn Shick Chang, Myong Soo Chung

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This study compared the efficiencies of using subcritical water, hot water, and organic solvents to extract flavonols from black tea, celery, and ginseng leaf. The effect of key operating conditions was determined by varying the temperature (110-200 °C), extraction time (5-15 min), and pressure (about 10 MPa) and the extracts were analysed quantitatively using HPLC. The yields of myricetin, quercetin, and kaempferol from plants were maximal at extraction temperatures of 170 °C, 170 °C and 200 °C, respectively, and they depend on the number of hydroxyl groups included in the chemical structure of the flavonols, with more of those with fewer hydroxyl (OH) groups attached being extracted at higher temperatures. The results also showed that the yields of flavonols by subcritical water extraction were 2.0- to 22.7- and 1.8- to 23.6-fold higher than those obtained using the ethanol and methanol as traditional extraction methods, respectively.

Original languageEnglish
Pages (from-to)21-26
Number of pages6
JournalFood Chemistry
StatePublished - 1 Feb 2015

Bibliographical note

Funding Information:
This research was supported by a Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education, Science and Technology (No. 2013R1A1A2A10060325 ).


  • Hydroxyl group
  • Kaempferol
  • Myricetin
  • Quercetin
  • Subcritical water extraction


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