Research of separation and concentration of roselle anthocyanins by ultrafiltration- nanofiltration membrane

Effects of purification and concentration processes of anthocyanin of roselle was studied by the ultrafiltration and nanofiltration membrane technology. Based on single factor experiments,the influence of the anthocyanin of roselle was concentrated by the ultrafiltration membrane,nanofiltration membrane and reverse osmosis membrane technology.The results showed that the best membrane combination was UH100 ultra- filtration membrane and NS027 nano- filtration membrane,operation pressure respectively was 0.4 MPa and 1.5 MPa,and operation temperature respectively was 30~35 ℃ and 40 ℃,which had higher extraction rate and the anthocyanin content of product was up to 32.7 mg / g.