Chrysosplenium americanum contains a glucosyltransferase which attacks the 2′- or 5′-positions of partially methylated flavonols. The two enzyme activities were not resolved on either Superose 12 (gel filtration), Mono Q (ion exchange) or Mono P (chromatofocusing) columns, suggesting similar chromatographic properties. The combined use of the affinity columns UDP-glucuronic acid agarose and Reactive Brown 10-agarose, coupled with a fast protein liquid chromatography system allowed the separation, for the first time, of the two flavonol-ring B-specific glucosyltransferases.