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Rheological behavior of acylated pepsin-solubilized collagen solutions: Effects of concentration

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Abstract

Effects of concentration on the rheological behavior of acylated pepsin-solubilized collagen solutions were investigated by steady shear tests, dynamic frequency sweep, creep tests and thixotropic loop measurements in this paper. The results showed that both acylated collagen and native collagen solutions exhibited the typical pseudoplastic behavior and displayed shear thinned behavior with the increase of shear rate. With the increase of acylated collagen concentrations from 5 to 10 mg/mL, shear viscosity, elasticity modulus (G′), viscous modulus (G″), complex viscosity (η*), and the ability to resist deformation increased due to the physical entanglement, whilst loss tangent (tan δ) decreased. Additionally, with the increase of acylated collagen concentrations, the area of thixotropic loop increased from 6.94 to 44.40 watts/m3, indicating that the thixotropy of acylated collagen increased. Compared with native collagen solution, acylated collagen solution had stronger shear viscosity, η*, thixotropy, and ability to resist deformation. Furthermore, Power law model, Carreau model, Cross model, Leonov model and Burger model, were suitable for the fitting of the experimental data.

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Authors and Affiliations

  1. The Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu, 610065, PR China

    Conghu Li, Zhenhua Tian, Wentao Liu & Guoying Li

  2. College of Life Sciences, Anqing Normal University, Anqing, 246011, PR China

    Conghu Li & Xiaoping Huang

  3. College of Textile & Garments, Southwest University, Chongqing, 400715, PR China

    Lian Duan

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  1. Conghu Li
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  2. Lian Duan
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  3. Zhenhua Tian
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  4. Wentao Liu
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  5. Guoying Li
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  6. Xiaoping Huang
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Correspondence to Guoying Li.

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Li, C., Duan, L., Tian, Z. et al. Rheological behavior of acylated pepsin-solubilized collagen solutions: Effects of concentration. Korea-Aust. Rheol. J. 27, 287–295 (2015). https://doi.org/10.1007/s13367-015-0028-6

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  • DOI: https://doi.org/10.1007/s13367-015-0028-6

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