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Journal of Pharmaceutical Investigation

, Volume 44, Issue 4, pp 309–316 | Cite as

Evaluation of protein formulation and its viscosity with DSC, DLS, and microviscometer

  • Nam Ah Kim
  • Dae Gon Lim
  • Jun Yeul Lim
  • Ki Hyun Kim
  • Woo Sun Shim
  • Nae-Gyu Kang
  • Seong Hoon JeongEmail author
Research Article

Abstract

The viscosity of highly concentrated protein solutions was evaluated using lysozyme as model protein. Viscosity profiles of lysozyme were examined with the effect of buffer and pH-value at various concentrations. The viscosity of lysozyme dissolved in water increased continuously with the concentration as the slope of shear stress against shear rate increased with the concentration. In addition, the viscosity of lysozyme was higher in histidine buffer than in acetate buffer at selected pH ranges. The effect of various excipient concentrations was also investigated in means of unfolding transition temperature (T m ), viscosity, hydrodynamic size and zeta potential by using differential scanning calorimetry (DSC), microviscometer and dynamic light scattering (DLS). The selected excipients except surfactants increased the viscosity of protein solution with their concentration. Carbohydrates increased the viscosity relatively higher than amino acids and also they increased the conformational stability (T m ) by enhancing the protein molecule more in compact form. Also amino acids increased the viscosity but decreased the conformational stability since they seemed to be only dispersed in the solution avoiding protein–protein interactions, resulting in a decrease of zeta potential. Consequently, the applied methods—DSC, DLS and microviscometer demonstrated the potential to develop a highly concentrated protein formulation to decrease the high viscosity effect with acceptable conformational stability.

Keywords

Lysozyme Viscosity Differential scanning calorimetry Microviscometer Protein stability Biopharmaceutical excipients 

Notes

Acknowledgments

This article dose not contain any studies with human and animal subjects performed by any of the authors. All authors (N.A. Kim, D.G. Lim, J.Y. Lim, K.H. Kim, W.S. Shim, N. G. Kang, S.H Jeong) declare that they have no conflict of interest. This study was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2012002399) and a grant of the Korean Healthcare technology R&D Project, Ministry of Health & Welfare, Republic of Korea. (Grant No.: A103017).

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Copyright information

© The Korean Society of Pharmaceutical Sciences and Technology 2014

Authors and Affiliations

  • Nam Ah Kim
    • 1
  • Dae Gon Lim
    • 1
  • Jun Yeul Lim
    • 1
  • Ki Hyun Kim
    • 1
  • Woo Sun Shim
    • 2
  • Nae-Gyu Kang
    • 2
  • Seong Hoon Jeong
    • 1
    Email author
  1. 1.College of PharmacyDongguk University-SeoulGoyangRepublic of Korea
  2. 2.LG Household & Health CareDaejeonKorea

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