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Updated: May 10, 2026
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Solubility of Hydrophobic Compounds in Aqueous Solution Using Combinations of Self-assembling Peptide and Amino Acid
Published on: September 20, 2017
Application of a PEG precipitation method for solubility screening: a tool for developing high protein concentration
Li Li1, Angela Kantor, Nicholas Warne
1Pharmaceutical Research and Development, BioTherapeutics Pharmaceutical Sciences, Pfizer, Andover, Massachusetts, USA. li.li123@pfizer.com
Summary
Extrapolated solubility using polyethylene glycol (PEG) precipitation accurately predicts protein drug candidate behavior. This miniaturized method efficiently identifies potential solubility and opalescence issues early in development.
Area of Science:
- Biochemistry
- Protein Chemistry
- Pharmaceutical Development
Background:
- Previous studies established a correlation between extrapolated solubility via polyethylene glycol (PEG) precipitation and experimentally measured protein solubility.
- Nonideality in highly soluble proteins can hinder accurate quantitative solubility prediction, necessitating alternative comparative methods.
Purpose of the Study:
- To evaluate the utility of extrapolated solubility for comparing multiple protein drug candidates.
- To miniaturize the PEG precipitation method for high-throughput screening, reducing protein requirements and simplifying the process.
Main Methods:
- A miniaturized microwell plate format of the PEG precipitation method was developed for high-throughput screening.
- Comparative protein solubility was assessed without supernatant concentration measurement, simplifying the conventional approach.
Main Results:
- The miniaturized method showed a strong correlation between predicted apparent solubilities and empirical observations of protein concentration difficulty.
- PEG precipitation accurately predicted protein opalescence levels at high concentrations, aligning well with experimental data.
Conclusions:
- The simplified, miniaturized PEG precipitation method effectively predicts protein drug candidate solubility and opalescence.
- This approach offers a valuable tool for early detection of potential formulation challenges, saving time and resources in drug development.
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