Holographic Characterization of Protein Aggregates

Chen Wang, Xiao Zhong, David B. Ruffner, Alexandra Stutt, Laura A. Philips, Michael Ward, David G. Grier

Research output: Contribution to journalArticle

Abstract

We demonstrate how holographic video microscopy can be used to detect, count, and characterize individual micrometer-scale protein aggregates as they flow down a microfluidic channel in their native buffer. Holographic characterization directly measures the radius and refractive index of subvisible protein aggregates and offers insights into their morphologies. The measurement proceeds fast enough to build up population averages for time-resolved studies and lends itself to tracking trends in protein aggregation arising from changing environmental factors. Information on individual particle's refractive indexes can be used to differentiate protein aggregates from such contaminants as silicone droplets. These capabilities are demonstrated through measurements on samples of bovine pancreas insulin aggregated through centrifugation and of bovine serum albumin aggregated by complexation with a polyelectrolyte. Differentiation is demonstrated with samples that have been spiked with separately characterized silicone spheres. Holographic characterization measurements are compared with results obtained with microflow imaging and dynamic light scattering.

Original languageEnglish (US)
Pages (from-to)1074-1085
Number of pages12
JournalJournal of Pharmaceutical Sciences
Volume105
Issue number3
DOIs
StatePublished - Mar 1 2016

Fingerprint

Refractometry
Silicones
Video Microscopy
Microfluidics
Bovine Serum Albumin
Centrifugation
Pancreas
Buffers
Insulin
Population
Protein Aggregates
Proteins
Polyelectrolytes
Dynamic Light Scattering

Keywords

  • biopharmaceuticals characterization
  • colloids
  • light scattering
  • microparticles
  • microscopy
  • particle size
  • protein aggregation

ASJC Scopus subject areas

  • Pharmaceutical Science

Cite this

Wang, C., Zhong, X., Ruffner, D. B., Stutt, A., Philips, L. A., Ward, M., & Grier, D. G. (2016). Holographic Characterization of Protein Aggregates. Journal of Pharmaceutical Sciences, 105(3), 1074-1085. https://doi.org/10.1016/j.xphs.2015.12.018

Holographic Characterization of Protein Aggregates. / Wang, Chen; Zhong, Xiao; Ruffner, David B.; Stutt, Alexandra; Philips, Laura A.; Ward, Michael; Grier, David G.

In: Journal of Pharmaceutical Sciences, Vol. 105, No. 3, 01.03.2016, p. 1074-1085.

Research output: Contribution to journalArticle

Wang, C, Zhong, X, Ruffner, DB, Stutt, A, Philips, LA, Ward, M & Grier, DG 2016, 'Holographic Characterization of Protein Aggregates', Journal of Pharmaceutical Sciences, vol. 105, no. 3, pp. 1074-1085. https://doi.org/10.1016/j.xphs.2015.12.018
Wang, Chen ; Zhong, Xiao ; Ruffner, David B. ; Stutt, Alexandra ; Philips, Laura A. ; Ward, Michael ; Grier, David G. / Holographic Characterization of Protein Aggregates. In: Journal of Pharmaceutical Sciences. 2016 ; Vol. 105, No. 3. pp. 1074-1085.
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