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Updated: May 29, 2026
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Characterizing Individual Protein Aggregates by Infrared Nanospectroscopy and Atomic Force Microscopy
Published on: September 12, 2019
Aggregation factor analysis for protein formulation by a systematic approach using FTIR, SEC and design of
Yan Wen Feng1, Ayako Ooishi, Shinya Honda
1National Institute of Advanced Industrial Science and Technology, Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan.
Journal of Pharmaceutical and Biomedical Analysis
|September 17, 2011
Summary
This study introduces a three-step strategy using Fourier transform infrared (FTIR) spectroscopy, size exclusion chromatography (SEC), and design of experiments (DOE) to analyze protein aggregation factors. This approach enables rapid screening for optimal protein formulation conditions.
Area of Science:
- Pharmaceutical Sciences
- Biophysical Chemistry
- Analytical Chemistry
Background:
- Protein aggregation is a critical issue affecting drug efficacy and safety.
- Understanding aggregation factors is essential for developing stable protein formulations.
- Current methods for formulation analysis can be time-consuming.
Purpose of the Study:
- To develop and validate a systematic approach for analyzing protein aggregation factors.
- To optimize protein formulation conditions using a combination of spectroscopic and chromatographic techniques.
- To establish a rapid screening strategy for protein formulation development.
Main Methods:
- Fourier transform infrared (FTIR) spectroscopy for conformational stability assessment.
- Size exclusion chromatography (SEC) for monitoring protein aggregation and storage stability.
- Design of experiments (DOE) to analyze main and interaction effects of formulation factors on aggregation.
Main Results:
- Low concentration analysis may not be suitable for high concentration formulations.
- Investigating combined factor interactions alongside main effects improves protein conformational stability.
- Stress testing, excluding pH, can predict suitable formulations, reducing the need for accelerated testing.
- pH effects on conformational and storage stability are inconsistent, necessitating accelerated testing for pH optimization.
Conclusions:
- A three-step strategy combining FTIR, SEC, and DOE provides an effective method for analyzing protein aggregation.
- This integrated approach facilitates rapid screening and identification of optimal protein formulation conditions.
- The study highlights the importance of considering interaction effects and specific testing conditions (stress vs. accelerated) for different factors.
