Pomegranate peel is rich in various compounds such as pectin. The aim of this study was to first, find the optimal conditions for extracting pomegranate pectin by ohmic heating method and then, to compare the properties of this pectin with pectin extracted under optimal conditions by conventional acidic method. With conventional acidic method, the optimal extractor acid, pH and solid to solvent ratio were determined, they were hydrochloric acid, 1.5 and 1:40, respectively, and these results were generalized to ohmic heating extraction condition. Then, the effects of voltage gradient and time, during ohmic heating on the yield and galacturonic acid, were studied using the response surface methodology (RSM). According to the findings, the optimal conditions for the voltage gradient and time were 10 V/cm and 18 min, respectively. Extraction yield and galacturonic acid percentage were 8.16% and 82.86% in ohmic method and 8.93% and 73.84% in conventional method, respectively. As it can be seen, the galacturonic acid content of the pectin extracted under ohmic heating were significantly higher. The study on different pomegranate peel size showed that in ohmic heating even with bigger size of particle, the yield remained constant.

石榴皮富含果胶等多种化合物。本研究的目的是首先寻找欧姆加热法提取石榴果胶的最佳条件，然后比较该果胶与常规酸性法在最佳条件下提取的果胶的性质。用常规酸法确定了最佳萃取酸、pH和固溶比，分别为盐酸1.5和1:40，并将这些结果推广到欧姆加热萃取条件。然后，使用响应面方法 (RSM) 研究了欧姆加热期间电压梯度和时间对产率和半乳糖醛酸的影响。根据研究结果，电压梯度和时间的最佳条件分别为 10 V/cm 和 18 min。欧姆法提取率和半乳糖醛酸百分率分别为8.16%和82.86%，常规方法提取率分别为8.93%和73.84%。可以看出，在欧姆加热下提取的果胶的半乳糖醛酸含量明显更高。对不同石榴皮大小的研究表明，在欧姆加热下，即使颗粒较大，产量也保持不变。