Study on technology of extracting rutin from tartary buckwheat

The technology of extracting rutin from tartary buckwheat was studied. With ethanol solution used for the extraction, the effects of solvent’s volume fraction, extraction temperature, extraction time, etc. on the extraction rate of rutin were investigated. The results of single-factor studies showed that ethanol of 60% concentration, extraction temperature 60 ℃ and extraction time 4 h led to a maximum extraction rate of rutin (4.05%). By single-factor experiments and 3-factor 3-level orthogonal tests, the order of the factors affecting the extraction rate of rutin was determined as extraction time solvent’s volume fraction extraction temperature. And the optimal extraction technology included ethanol of 70% concentration, extraction temperature 60 ℃ and extraction time 2 h, with the extraction rate being 3.91%.