بررسي استخراج آنتوسيانين ها از كلم قرمز و جداسازي آنها توسط فرايند غشايي فيبرهاي مويين مشبك

Investigation of Extraction and Separation of Anthocyanins from Red Cabbage by Ultrafiltration Hollow Fibers Membrane Process

In this research, extraction of anthocyanins from red cabbage was investigated at different temperature and pH values using methanol-water solvent with different concentration of HC1.Extraction was done by a batch method. Increasing acidity and temperature of the solvent increased the extraction efficiency and color of the solution. The separation of anthocyanins pigments were performed by an ultrafiltration (UF) hollow fiber membrane system made of polysulfone with a porosity of 10,000 NMWC. The effect of membrane operational parameters on the efficiency of anthocyanin separation was investigated. These parameters included, the feed flow rate, feed concentration, membrane separation process time and process temperature. Increasing the feed flow rate, caused an increase of the permeate flux due to a decrease in boundary layer inside the fibers. An increase in the concentration of anthocyanins in the feed solution, increased the concentration of anthocyanins in the permeate phase of the hollow fiber system due to an increase in the driving force of separation. Higher process temperature resulted in higher permeate fluxes arising from a decrease in feed viscosity. Experiments were also performed in this research to determine the stability of anthocyanins at different conditions of temperature and pH as well as in the presence of light, oxygen and the antioxidant of ascorbic acid.