3. The following is the extraction process of capsaicin in the patent, which is mainly divided into 6 steps. Please indicate the main purpose and function of each step?

Step 1: Extract capsaicin into ethanol by taking advantage of the fact that capsaicin is easily soluble in ethanol and discard the peppers.

Step 2: Taking advantage of the characteristic that capsaicin is soluble in alkali solution but other organic impurities are insoluble in alkali solution, dissolve capsaicin into alkali solution, separate out the organic phase containing other organic impurities and discard them, and then use acid Adjust the pH to precipitate capsaicin from the alkaline water for the next step of extraction.

Step 3: Put the capsaicin green zone into ether and discard the water layer containing impurities.

Step 4: Dissolve capsaicin in petroleum ether, separate the petroleum ether, and discard impurities that are insoluble in petroleum ether.

Step 5: Concentration

Step 6: Recrystallize and further purify capsaicin to obtain pure product.