Fluorescence and CD spectroscopic sugar sensing by a cyanine-appended diboronic acid probe

Masayuki Takeuchi, Toshihisa Mizuno, Hideyuki Shinmori, Michio Nakashima, Seiji Shinkai

Research output: Contribution to journalArticlepeer-review

70 Citations (Scopus)


A cyanine dye (4) bearing two boronic acids was designed and synthesized, expecting the selective binding of monosaccharides through the formation of 1:1 intramolecular complexes. While it aggregates in water, it exists discretely in water/methanol 1:1 mixed solvent. In the latter solvent the fluorescence spectra were scarcely affected by the medium pH but efficiently increased when it formed intramolecular 1:1 complexes with monosaccharides. This complexation mode was also corroborated by CD spectroscopy and continuous variation plots. Hence, the saccharide-induced fluorescence increase is rationalized in terms of 'rigidification' of the cyanine skeleton. The association constants (K) were estimated from plots of saccharide concentration vs. fluorescence intensity: the largest K was observed for D-fructose (1.3 x 105 M-1) and the next for D-arabinose (1.0 x 104 M-1). This is a novel system for sensitive and selective fluorescence detection of monosaccharides.

Original languageEnglish
Pages (from-to)1195-1204
Number of pages10
Issue number4
Publication statusPublished - Jan 1996
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Drug Discovery
  • Organic Chemistry


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