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Journal of Wood Science

, Volume 55, Issue 4, pp 308–313 | Cite as

Antimicrobial activity against Streptococcus sobrinus and glucosyltransferase inhibitory activity of taxifolin and some flavanonol rhamnosides from kempas (Koompassia malaccensis) extracts

  • Harlinda Kuspradini
  • Tohru Mitsunaga
  • Hideo Ohashi
Note

Abstract

Twenty plant materials collected from the islands of Java and Kalimantan in Indonesia were extracted with 50% aqueous ethanol (crude extract). The crude extracts were assayed for antimicrobial activities against Streptococcus sobrinus and for glucosyltransferase (GTase) inhibition. Fourteen extracts inhibited the growth of S. sobrinus by more than 50% and six extracts inhibited GTase activity by more than 50% at a concentration of 100 μg/ml. Koompassia malaccensis (kempas) extracts showed 90% depression of S. sobrinus growth and 80% inhibition of GTase activity at a concentration of 100 μg/ml. Kempas crude extracts were subjected to column chromatography using Sephadex LH-20 and then preparative high-performance liquid chromatography to isolate four compounds A, B, C, and D. These compounds were identified as taxifolin and the flavanonol rhamnoside isomers neoastilbin, astilbin, and isoastilbin, respectively, from 1H and 13C nuclear magnetic resonance (NMR) spectra and other two-dimensional NMR techniques (COSY, HMBC, and HMQC). Each compound depressed the growth of S. sobrinus over a concentration range of 9.3242.7 μg/ml and showed GTase inhibitory activity with IC50 values in the range 27.4–57.3 μg/ml. Taxifolin and flavanonol rhamnoside isomers isolated for the first time from kempas could be potent compounds for preventing dental caries.

Key words

Kempas Streptococcus sobrinus Taxifolin Neoastilbin Astilbin 

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Copyright information

© The Japan Wood Research Society 2009

Authors and Affiliations

  • Harlinda Kuspradini
    • 1
    • 2
  • Tohru Mitsunaga
    • 1
  • Hideo Ohashi
    • 1
  1. 1.Department of Applied Life Science, Faculty of Biological ScienceGifu UniversityGifuJapan
  2. 2.Department of Forest Product Technology, Faculty of ForestryMulawarman UniversitySamarindaIndonesia

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