Abstract:

The effects of ethanol concentration, solid-to-liquid ratio, extraction temperature and time on the yield of dihydroquercetins from larch were studied, and a L9(34) orthogonal test was then employed to optimize the extraction. The content of dihydroquercetins was determined by spectrometry. Results showed that the optimum extraction conditions were as follows: ethanol concentration 30%, temperature 40 ℃, solid-liquid ratio 1:20 (g/ml) and extraction time 120 min. Under such conditions, the yield of dihydroquercetins extract was 2.14% with its purity at 11.3%.

Key words: larch, dihydroquercetin, spectometric method, extraction technology