NIST logo

Publication Citation: A Microliter Capillary Rheometer for Characterization of Protein Solutions

NIST Authors in Bold

Author(s): Steven D. Hudson; Prasad S. Sarangapani; Kalman D. Migler; Jai A. Pathak;
Title: A Microliter Capillary Rheometer for Characterization of Protein Solutions
Published: October 10, 2014
Abstract: Rheometry is an important characterization tool for therapeutic protein solutions because it determines syringeability and relates indirectly to solution stability and thermodynamic interactions. Despite the maturity of rheometry, there remains a need for a rheometer that meets the following three needs of the biopharamaceutical industry: small volume; large dynamic range of shear rates; and no air-sample interface. Here we report the development of a miniaturized capillary rheometer that meets these needs and is potentially scalable to a multi-well format. These measurements consume only a few microliters of sample and have an uncertainty of a few percent. We demonstrate its performance on monoclonal antibody solutions at different concentrations and temperatures. The instrument has a dynamic range of approximately three decades (in shear rate) and can measure Newtonian, shear thinning and yielding behaviors, which are representative of the different solution behaviors typically encountered. We compare our microliter capillary rheometer to existing instruments to describe the range of parameter space covered by our device.
Citation: Journal of Pharmaceutical Sciences
Volume: 104
Pages: pp. 678 - 685
Keywords: viscosity; rheology; microfluidics; microliter; protein solution; monoclonal antibody
Research Areas: Complex Fluids
DOI:  (Note: May link to a non-U.S. Government webpage)
PDF version: PDF Document Click here to retrieve PDF version of paper (473KB)