Pycnalin, a new α-glucosidase inhibitor from Acer pycnanthum

Ai Ogawa, Yusaku Miyamae, Atsushi Honma, Tomoyuki Koyama, Kazunaga Yazawa, Hideyuki Shigemori*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


A new compound, pycnalin (1), together with four known compounds, ginnalins A (2), B (3), C (4), and 3,6-di-O-galloyl-1,5-anhydro-D-glucitol (3,6-di-GAG) (5), were isolated from Acer pycnanthum. The structure of 1 was determined on the basis of 2D-NMR spectral data and synthesis of 1. Pycnalin (1) is the first 1,5-anhydro-D-mannitol linked to a gallic acid, while compounds 2-5 were 1,5-anhydro-D-glucitol linked to gallic acids. All compounds were tested in vitro for α-glucosidase inhibitory and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activities. Pycnalin (1) exhibited moderate α-glucosidase inhibitory activity as well as free radical scavenging activity. Ginnalin A (2) and 3,6-di-GAG (5), which have two galloyl groups, exhibited potent α-glucosidase inhibition, compared to those of other compounds 1, 3, and 4 containing a galloyl group. These results suggest that α-glucosidase inhibition is influenced by the number of galloyl groups.

Original languageEnglish
Pages (from-to)672-675
Number of pages4
JournalChemical and Pharmaceutical Bulletin
Issue number5
Publication statusPublished - 2011 May
Externally publishedYes


  • α-glucosidase inhibition
  • 1,1-diphenyl-2-picrylhydrazyl radical scavenging activity
  • Acer pycnanthum
  • Ginnalin
  • Pycnalin

ASJC Scopus subject areas

  • Drug Discovery
  • Chemistry(all)


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