Optimization of Process for Extraction of Yellow Pigment from Almond Shell

Abstract

The effect of extraction temperature,extraction time,alcohol concentration, ratio of material to liquid (g/ml)on extraction yield of natural yellow pigment from waste almond shell were studied. The optimum conditions were determined by L9 (34) the orthogonal test . The optimum extraction conditions are the extraction temperature at 75°C;the extraction time for 2h; the extraction agent concentration of 20%ethanol ; the material-liquid ration (g/ml) 1:15.The extraction yield of natural yellow pigment from almond shell is 6.25%,The order of effects are extraction temperature>extraction time>ratio of material to liquid(g/ml)>alcohol concentration.This research provides the theoretical basis for the industrial production of the extraction of natural almond shell pigment and provides a new way for the re-use of the abandoned almond shell.