In order to analyze the aroma characteristics and composition of tolu balsam. tolu balsam extracts prepared with five different concentrations of ethanol were separated by pervaporation. The retentate and permeate were evaluated by sensory evaluation and their volatile and semi volatile components were analyzed by solid-phase supported liquid-liquid extraction coupled with gas chromat... https://cuttingedgecutleryco.shop/product-category/pvc-patch/