Journal of Tianjin Agricultural University ›› 2017, Vol. 24 ›› Issue (3): 79-84.

• Researches and Scientific Notes • Previous Articles     Next Articles

Optimization on Ultrasonic-assisted Acid Extraction of Pectin from Tangerine Peel

LI Ping, WANG Qing-qing, YAN Jing-kun, ZHANG Lan, SHU Zhan, HU Chu-yao   

  1. College of Basic Science, Tianjin Agricultural University, Tianjin 300384, China
  • Received:2016-11-19 Online:2017-09-30 Published:2019-10-15

Abstract: :Ultrasonic-assisted acid method was applied for the extraction of pectin from tangerine peel in order to study the effect of ultrasonic-assisted acid extraction on pectin extraction. Based on the results of single factor experiments, orthogonal experiment was used to optimize the extraction process with extraction rate as an indicator and physical and chemical properties of the pectin were also determined. Results showed that the optimum extraction conditions were as follows: pH of the solution was 1.5, ratio of material to solvent was 1∶25(g∶mL), ultrasonic temperature was 75 ℃, ultrasonic power was 231 W, powder granularity of the material was 60~80 mesh and ultrasonic time was 40 min and under these conditions the extraction rate could reach 20.60%. The factors impacting extraction rate were in the order of ratio of material to solvent>ultrasonic temperature>powder granularity>pH of the solution>ultrasonic power>ultrasonic time. The extraction of pectin from tangerine peel was successfully confirmed by Fourier transform infrared spectroscopy(FTIR). Meanwhile, the pectin extracted by ultrasonic- assisted acid method exhibited higher extraction rate(increasing 4.25%), displayed greater purity(enhancing 12.29%), showed higher esterification degree(improving 10.19%)than traditional acid method, respectively, and the pectin prepared belonged to the high methoxyl pectin. Ultrasonic-assisted acid extraction is a feasible method for extracting pectin from tangerine peel.

Key words: tangerine peel, pectin, ultrasonic-assisted acid method, extraction, process optimization

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