Study on Extraction Technology for Chlorogenic Acid From Sweet Potato Leaves by Orthogonal Design

Using sweet potato leaves as material,the effect of 5 factors(different alcohol concentration,material liquid ratio,pH value,extracting times,distilled time,chlorogenic acid content)to extraction of chlorogenic acid from sweet potato leaves were studied through the orthogonal test.The results showed that the effect of each factor on the extraction of chlorogenic acid order were as follows:alcohol concentrationextraction timesmaterials-liquid ratiopH valuedistilled time.The optimal parameters were alcohol concentration 30%,liquid material ratio 1∶20g/mL,pH value 5.0,extracting times four times,distilled 90minutes.The content of chlorogenic acid extracted from sweet potato leaves by the optimum extracting technology reached to 3.517%.The optimum technology was feasible and the content of chlorogenic acid extracted from sweet potato leaves by the optimum extracting technology was higher.