Efficient methods for isolating five phytochemicals from Gentiana macrophylla using high-performance countercurrent chromatography

J Sep Sci. 2016 Dec;39(24):4723-4731. doi: 10.1002/jssc.201600988. Epub 2016 Nov 18.

Abstract

Efficient high-performance countercurrent chromatography methods were developed to isolate five typical compounds from the extracts of Gentiana macrophylla. n-Butanol-soluble extract of G. macrophylla contained three hydrophilic iridoids, loganic acid (1), swertiamarin (2) and gentiopicroside (3), and a chromene derivative, macrophylloside D (4) which were successfully isolated by flow rate gradient (1.5 mL/min in 0-60 min, 5.0 mL/min in 60-120 min), and consecutive flow rate gradient HPCCC using n-butanol/0.1% aqueous trifluoroacetic acid (1:1, v/v, normal phase mode) system. The yields of 1-4 were 22, 16, 122, and 6 mg, respectively, with purities over 97% in a flow rate gradient high-performance countercurrent chromatography, and consecutive flow rate gradient high-performance countercurrent chromatography gave 1, 2, 3 (54, 41, 348 mg, respectively, purities over 97%) and 4 (13 mg, purity at 95%) from 750 mg of sample. The main compound in methylene chloride soluble extract, 2-methoxyanofinic acid, was successfully separated by n-hexane/ethyl acetate/methanol/water (4:6:4:6, v/v/v/v, flow-rate: 4 mL/min, reversed phase mode) condition. The structures of five isolates were elucidated by 1 H, 13 C NMR and ESI-Q-TOF-MS spectroscopic data which were compared with previously reported values.

Keywords: Chromens; Gentiana macrophylla; High-performance countercurrent chromatography; Iridoids.

MeSH terms

  • Chromatography, High Pressure Liquid
  • Countercurrent Distribution
  • Gentiana / chemistry*
  • Hexanes
  • Phytochemicals / isolation & purification*
  • Plant Extracts / chemistry*

Substances

  • Hexanes
  • Phytochemicals
  • Plant Extracts
  • n-hexane