Quantitative analysis of PMLA nanoconjugate components after backbone cleavage

Area of Science:

• Biomedical Engineering
• Polymer Chemistry
• Nanotechnology

Background:

• Multifunctional polymer nanoconjugates are promising for cancer therapy.
• Polymalic acid (PMLA)-based nanoconjugates have shown efficacy in treating brain and breast cancers.
• Accurate analysis of individual components within these complex nanoconjugates is difficult with conventional methods.

Purpose of the Study:

• To develop a reliable method for analyzing antibody and antisense oligonucleotide (AON) content in PMLA nanoconjugates.
• To overcome limitations of traditional spectrometry and HPLC for complex nanoconjugate analysis.

Main Methods:

• Utilized the polyester nature of PMLA, enabling cleavage by ammonium hydroxide.
• Developed a selective cleavage method for the PMLA backbone.
• Employed SEC-HPLC (Size Exclusion Chromatography-High-Performance Liquid Chromatography) for simultaneous analysis of antibody and AON content.
• Optimized cleavage conditions to preserve antibody integrity and biological activity.

Main Results:

• Successfully analyzed antibody and AON content simultaneously within PMLA nanoconjugates.
• The selective cleavage method demonstrated superior reliability compared to the bicinchoninic acid (BCA) method for antibody quantification.
• The optimized conditions ensured PMLA backbone degradation without compromising antibody function.

Conclusions:

• A novel and powerful method for component analysis of polymer nanoconjugates was established.
• This approach offers a new direction for analyzing complex nanoconjugate systems.
• The method ensures accurate quantification essential for advancing nanomedicine development.