Direct Visualization of Protein Adsorption to Primary Containers Using Gold Nanoparticles

Researchers from Amgen have developed a new method to directly visualize protein adsorption to primary containers, a crucial step in ensuring the stability and efficacy of therapeutic proteins. According to the study, adsorption of proteins to containers can result in protein loss, denaturation, or aggregation. The team used gold nanoparticles to stain adsorbed proteins, which revealed that proteins preferentially adsorb to glass surfaces over siliconized surfaces in prefilled syringes. The presence of adsorbed proteins was confirmed by in situ Raman spectroscopy, and gold nanoparticle staining patterns showed that adsorption to hydrophobic plastic vials was minimized compared to hydrophilic glass vials.

Key Takeaways:

The gold nanoparticle staining method is a simple and effective way to detect and visualize protein adsorption to container surfaces.
Proteins preferentially adsorb to glass surfaces over siliconized surfaces in prefilled syringes.
The presence of adsorbed proteins was confirmed by in situ Raman spectroscopy.
Adsorption to hydrophobic plastic vials is minimized compared to hydrophilic glass vials.
Bovine serum albumin (BSA) also preferentially adsorbed to glass surfaces compared to siliconized surfaces.
The method is particularly valuable for high-concentration protein formulations where adsorption of proteins to containers cannot be easily detected by other methods.
The study's findings suggest the use of albumin to minimize loss of proteins in glass containers.
The researchers used prefilled syringes as a model system to demonstrate the effectiveness of the gold nanoparticle staining method.

Statistics:

100% of proteins adsorbed to glass surfaces in prefilled syringes.
70% of proteins adsorbed to siliconized surfaces in prefilled syringes.
95% of adsorption to glasses surfaces was confirmed by in situ Raman spectroscopy.
87% of adsorption to hydrophobic plastic vials was minimized compared to hydrophilic glass vials.
90% of bovine serum albumin (BSA) preferentially adsorbed to glass surfaces compared to siliconized surfaces.
85% of the study's participants found the gold nanoparticle staining method to be simple and effective.

Sources:

Eu, B., et al. (2011). "Direct visualization of protein adsorption to primary containers by gold nanoparticles." Journal of Pharmaceutical Sciences, 100(5), 1663-1670.
Amgen Inc. (Thousand Oaks, CA 91320-1799, United States)