Step 2: Using the characteristic that capsaicin is soluble in alkali liquor and other organic impurities are insoluble in alkali liquor, capsaicin is dissolved in alkali liquor, the organic phase containing other organic impurities is separated and discarded, and then the pH is adjusted with acid to separate capsaicin from alkali water for further extraction.
Step 3: put capsaicin into ether and discard the water layer containing impurities.
Step 4: Dissolve capsaicin in petroleum ether, separate petroleum ether and discard impurities insoluble in petroleum ether.
Step 5: Focus.
Step 6: recrystallization, further purification of capsaicin, to obtain pure products.