Ultrasound-Assisted Decalcification Process Optimizationof Carapace of Chinese Soft-shelled Turtle and Biochemical Characterization of Collagen

ZHAO Qiongyu; HU Jian; LI Caiyan; XU Shujie; SONG Wei

doi:10.13386/j.issn1002-0306.2022010104

Volume 43 Issue 22

Nov. 2022

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Science and Technology of Food Industry > 2022 > 43(22): 39-51. > DOI: 10.13386/j.issn1002-0306.2022010104

ZHAO Qiongyu, HU Jian, LI Caiyan, et al. Ultrasound-Assisted Decalcification Process Optimizationof Carapace of Chinese Soft-shelled Turtle and Biochemical Characterization of Collagen[J]. Science and Technology of Food Industry, 2022, 43(22): 39−51. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2022010104.

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Ultrasound-Assisted Decalcification Process Optimizationof Carapace of Chinese Soft-shelled Turtle and Biochemical Characterization of Collagen

College of Biological and Environmental Sciences, Zhejiang Wanli University, Ningbo 315000, China

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Received Date: January 13, 2022
Available Online: September 06, 2022

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Abstract

Abstract

In order to determine the technological conditions for decalcification of the carapace from the Chinese soft-shelled turtle(Pelodiscus sinensis), the decalcification conditions were optimized under ultrasonic assisted treatment with hydrochloric acid as a decalcifying agent. The decalcification rate and collagen migration rate were employed as evaluation indicators to investigate the effects of six factors including hydrochloric acid concentration, material-to-liquid ratio, decalcified time, decalcified temperature, working time of ultrasonic gap and ultrasonic power. In basis of optimized single factors, the Box-Behnken design in the response surface was used to optimize the process conditions of turtle carapace decalcification and establish a mathematical model. The effects of ultrasound-assisted decalcification process on the structural properties of collagen were investigated through biochemical character such as Ultraviolet spectrum scanning, SDS-PAGE spectrum, Fourier infrared scanning, amino acid analysis and Circular dichroism spectrum. The results showed that the best process conditions for ultrasonic-assisted decalcification of the carapace were: 0.8 mol/L of hydrochloric acid concentration, 1:40 (g/mL) of material-to-liquid ratio, 60 min of decalcified time, 145 W of ultrasound and 30 s/30 s of ultrasonic gap. Under these conditions, the decalcification rate was 64.97%±1.03%, and the collagen migration rate was 3.22%±0.84%. The results showed that the subunit composition, triple helix structure and secondary structure of carapace collagen remained unchanged. Therefore, ultrasound-assisted hydrochloric acid exhibited a good effect on the decalcification of the carapace of the Chinese soft-shelled turtle, which would provide a basis for further study concerning extraction of collagen from the carapace of the Chinese soft-shelled turtle.
- Pelodiscus sinensis,
- carapace,
- decalcification,
- hydrochloric acid,
- ultrasonic-assisted,
- collagen,
- biochemical characterization

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