Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Gallotannins from Nut Shell Extractives of Camellia oleifera

  • HE, Yi-Chang (College of Land Resources and Environment, Jiangxi Agricultural University, Key Lab of Agricultural Resources and Ecology of Poyang Lake Basin) ;
  • WU, Mei-Jie (Jiangxi Academy of Forestry) ;
  • LEI, Xiao-Lin (Jiangxi Academy of Forestry) ;
  • YANG, Jie-Fang (Jiangxi Academy of Forestry) ;
  • GAO, Wei (Jiangxi Academy of Forestry) ;
  • BAE, Young-Soo (Jiangxi Academy of Forestry) ;
  • KIM, Tae-Hee (Department of Forest Biomaterials Engineering, College of Forest & Environmental Sciences, Kangwon National University) ;
  • CHOI, Sun-Eun (Department of Forest Biomaterials Engineering, College of Forest & Environmental Sciences, Kangwon National University) ;
  • LI, Bao-Tong (College of Land Resources and Environment, Jiangxi Agricultural University, Key Lab of Agricultural Resources and Ecology of Poyang Lake Basin)
  • Received : 2021.03.11
  • Accepted : 2021.05.18
  • Published : 2021.05.25
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Abstract

Camellia nut shell was collected, dried at room temperature and ground to get fine powder. The powder was extracted three times with 95% EtOH, combined, evaporated, and then freeze dried. The crude powder was dissolved in H2O and then sequentially fractionated with n-hexane, CH2Cl2, EtOAc and n-BuOH. A part of EtOAc fraction was chromatographed on a silica gel and on a Sephadex LH-20 columns using MeOH, aqueous MeOH, EtOAc-n-hexane and EtOH-n-hexane to isolate gallotannins. Three gallotannins, 1,2-di-O-galloyl-β-D-glucopyranoside (2), 1,2,6-tri-O-galloyl-β-D-glucopyranoside (3) and 1,2,3,6-tetra-O-galloyl-β-D-glucopyranoside (4), including gallic acid (1), were isolated and elucidated by NMR and Mass spectroscopies. Although nothing new, these gallotannins were first reported from the nut shell extractives of camellia tree (Camellia oleifera C. Abel). This study was to investigate the chemical constituents, especially hydrolysable tannins, of nut shell extractives of Camellia oleifera and to provide basic information for the future chemical utilization of this species.

Keywords

Acknowledgement

This study was supported by "R&D Program for Forest Science Technology (Project No. 2019151D10-2023-0301) of Korea Forest Service and also by Science and Technology Innovation Project of Forestry Department of Jiangxi Province (No. 201809) and also partially supported by Key Science and Technology Project of Jiangxi Academy of Forestry (No. 2018512101).

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