Optimization of extraction technology of quinoa polyphenols by response surface methodology

To optimize the conditions for the extraction of polyphenols,using quinoa which grown in Inner Mongolia as raw material,with yield as test index to extract polyphenols.The effects of ethanol concentration,material liquid ratio,extraction temperature and time on yield of quinoa polyphenols were investigated. Experimental factors and their levels were determined by single factor test. Subsequently,the Box- Behnken experimental design was performed to optimize the conditions for quinoa polyphenols extraction. The results indicated the optimum conditions for quinoa polyphenols extraction were obtained as follows: ethanol concentration was 49%,material liquid ratio was 1∶ 26 g / m L,extraction temperature was 73 ℃,extraction time was 62 min.Under these conditions,the best yield of quinoa polyphenols was( 226.77 ± 1.94) mg /100 g. The optimized extraction technology applied guiding significance for the quinoa polyphenols extraction.