Abstract
In order to improve the traditional methods of procyanidins extracting, ultrasonic-assisted filtration was used in the process of extracting proan-thocyanidin which was from membrane concentration of grape seed. Through the mechanism analysis of ultrasonic-assisted ultrafiltration, ultrasonic is able to alleviate the phenomenon of concentration polari-zation, so the efficiency of extracting proanthocyanidins was improved. Based on the phenomenon that ultrasonic enhanced membrane concentration of procyanidins extracting, BP neural network was used to construct the ultrasonic-assisted filtration membrane-flux model, and the genetic algorithm was used to optimize the parameters of ultrasonic-assisted filtration. The research results show that the optimal process parameters of ultrasonic-assisted are ultrasonic power 240W, number of vibrator 6, angle of vibrator 40°and ultrasonic time 9 min. Itrafiltration flux increased by 42% under the above conditions.
Highlights
Procyanidins have received growing attention because of the powerful function of antioxidant, resisting arteriosclerosis, antithrombotic, antitumor and skin care
Membrane concentration technology is a typical application of membrane separation method, compared with traditional hot concentration method, it has the advantages of low working temperature, small thermal decomposition and low risk of degeneration, no phase change, low energy consumption, etc
Lots of scholars in and abroad have combined membrane separation technology with ultrasound in order to solve the problem caused by membrane fouling and concentration polarization, for example, Ultrasound field enhanced PAN membrane filtration was studied by Takaomi Kobayashi etc. [4]
Summary
Procyanidins have received growing attention because of the powerful function of antioxidant, resisting arteriosclerosis, antithrombotic, antitumor and skin care. There has been related research on the extraction of polyphenols active natural products with membrane concentration technology [2]. Lots of scholars in and abroad have combined membrane separation technology with ultrasound in order to solve the problem caused by membrane fouling and concentration polarization, for example, Ultrasound field enhanced PAN membrane filtration was studied by Takaomi Kobayashi etc. Effects of ultrasound on ultrafiltration of radix astragali extract and cleaning of fouled membrane was studied by Cai etc. The application of the combined ultrasound and membrane separation technology to ultrafiltration concentration of procyanidins has reported rarely. The technology of ultrasonic-assisted filtration is applied to the membrane enrichment process of extracting procyanidins. The structure of ultrafiltration concentration equipment is designed and the effect of ultrasound parameters on procyanidins extracting efficiency is analyzed. It takes membrane flux as index to detect the membrane enrichment efficiency, to determine the optimum process condition of ultrafiltration
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