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Evaluation of the In vitro Activity of Glycyrrhiza Cultivar Roots

감초 육성품종 뿌리 추출물의 In vitro 활성 평가

  • 이승은 (농촌진흥청 국립원예특작과학원 인삼특작부) ;
  • 이정훈 (농촌진흥청 국립원예특작과학원 인삼특작부) ;
  • 박춘근 (농촌진흥청 국립원예특작과학원 인삼특작부) ;
  • 김형돈 (농촌진흥청 국립원예특작과학원 인삼특작부) ;
  • 이윤지 (농촌진흥청 국립원예특작과학원 인삼특작부) ;
  • 서경혜 (농촌진흥청 국립원예특작과학원 인삼특작부) ;
  • 정현수 (농촌진흥청 국립원예특작과학원 인삼특작부) ;
  • 장재기 (농촌진흥청 국립원예특작과학원 인삼특작부) ;
  • 김동휘 (농촌진흥청 국립원예특작과학원 인삼특작부)
  • Received : 2018.11.07
  • Accepted : 2019.04.19
  • Published : 2019.04.30

Abstract

Background: Glycyrrhiza radix (licorice root) have been used as an oriental medicine material for long time, and its protective effects on oxidative stress, inflammation and cognition deficit have been recently reported. However, the cultivation of Glycyrrhiza species as medicinal crops is associated with some problems such as low productivity and early leaf fall, etc. To resolve this problems, Glycyrrhiza cultivars have been developed by direct hybridization of each Glycyrrhiza species by Korean researchers. The present study was conducted to compare the Glycyrrhiza cultivar radix (Dagam, Sinwongam and Wongam) for their anti-oxidation, anti-inflammation, and cognition improvement effects and levels of liquiritin, isoliquiritigenin and licochalcone in order to select an excellent cultivar as a material resource. Methods and Results: For evaluating the inhibitory efficacies of the Glycyrrhiza cultivar extracts on oxidative stress and inflammation in BV2 cells, we measured their reactive oxygen species (ROS) production and nitric oxide (NO) release after treating them with lipopolysccharide. The scavenging activities on 2,2-diphenyl-1-picrylhydrazyl (DPPH) and peroxynitrite ($NOO^-$) radicals were evaluated. Cell proliferation and N-methyl-D-aspartate receptor (NMDAR) inhibition were analyzed. The total phenol, liquiritin, isoliquiritigenin and licochalcone A content in the extracts of the three culivars were quantified. Furthermore, the correlation coefficient between the activities and contents of total phenol, liquiritin, isoliquiritigenin and licochalcone A were also calculated. The results indicated that Sinwongam exhibited potent anti-oxidant, anti-inflammatory and NMDAR inhibititory activities. Sinwongam also showed higher total phenol and licochalcone A contents than the other cultivars. Among the three cultivars, Dagam exhibited a positive effects on NO release inhibition, cell proliferation and contents of liquiritin and isoliquiritigenin. Conclusions: Sinwongam is expected to be the most useful resource as a functional material for anti-oxidation/anti-inflammation and cognition improvement among the three studied licorice cultivars.

Keywords

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Fig 1. Specimens of Glycyrrhiza cultivars.

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Fig. 2. UV spectrum of the standard compounds (A; liquiritin, B; isoliquilitigenin, C; licochalcone A).

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Fig. 3. HPLC chromatograms of the standard compounds dissolved in 3㎎/㎖ of 50% ethanol (A); liquiritin, (B); isoliquilitigenin and licochalcone A.

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Fig. 4. HPLC chromatograms of liquiritin from Glycyrrhiza cultivar extracts.

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Fig. 5. HPLC chromatograms of isoliquiritigenin and licochalcone A from Glycyrrhiza cultivar extracts.

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Fig. 6. Inhibition activity of Glycyrrhiza cultivar extracts on reactive oxygen species.

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Fig. 7. Comparison of inhibition activity on reactive oxygen species between Glycyrrhiza cultivar extracts and vitamin C.

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Fig. 8. DPPH radical scavenging activity of Glycyrrhiza cultivar extracts.

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Fig. 9. Inhibition activity of Glycyrrhiza cultivar extracts on nitric oxide production.

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Fig. 10. Effect of Glycyrrhiza cultivar extracts on BV2 cell proliferation.

Table 1. Inhibitory activities on peroxynitrite, NMDA receptor and total phenol content of Glycyrrhiza cultivars extracts.

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Table 2. Contents of liquiritin, isoliquiritigenin and licochalcone A in the Glycyrrhiza cultivar extracts.

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Table 3. Correlation coefficients between total phenol, liquiritin, isoliquilitigenin, lichochalcone A and activities in the Glycyrrhiza cultivar extracts.

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