DIALYSIS OF FLAVOR COMPOUNDS - YIELDS OF EXTRACTION ON MODEL SOLUTION

The extraction of 58 flavour compounds by Nafion membrane dialysis was studied using a model solution. Reproducibility and yield of the meth od were investigated. The coefficient of variation of the extraction y ield was less than 15% for 48 of the 58 compounds tested. When the num ber of carbon atoms increased, the extraction yield fell to zero for c ompounds with more than ten carbon atoms. Flavour compounds with a cyc lic structure showed a better diffusion rate through the membrane than other compounds with the same number of carbon atoms. The extraction yield seems to be correlated mainly to the hydrophobicity of the molec ule. The use of the method for quantitative analysis was studied. Extr action rate can be considered as constant regardless of the quantity o f compounds. The separation of flavour compounds from lipids was studi ed by this method. A better extraction yield with lipids was observed for eight compounds, for all other molecules no significant difference could be observed. The oil does not diffuse through the dialysis memb rane.