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Related Experiment Video

Updated: Jan 21, 2026

Isolation of Next-Generation Gene Therapy Vectors through Engineering, Barcoding, and Screening of Adeno-Associated Virus AAV Capsid Variants
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Analytical Strategies for Quantification of Adeno-Associated Virus Empty Capsids to Support Process Development.

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|August 2, 2019
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Summary
This summary is machine-generated.

A new anion-exchange HPLC method accurately quantifies the ratio of empty-to-full viral capsids in gene therapy products. This method improves scalability and sensitivity for recombinant adeno-associated virus (rAAV) purification processes.

Keywords:
AEX-HPLCassay developmentgene therapyrAAV empty capsids

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Area of Science:

  • Biotechnology
  • Gene Therapy
  • Biopharmaceutical Development

Background:

  • Recombinant adeno-associated virus (rAAV) gene therapy is rapidly advancing.
  • A key challenge is separating empty capsids from full ones for effective purification.
  • Accurate quantification of the empty-to-full capsid ratio is crucial for process development.

Purpose of the Study:

  • To develop a novel, scalable analytical method for determining the empty-to-full capsid ratio in rAAV samples.
  • To compare the new method with existing techniques like transmission electron microscopy and analytical ultracentrifugation.

Main Methods:

  • Development of a novel anion-exchange high-performance liquid chromatography (HPLC) assay.
  • Quantification of the empty-to-full capsid ratio using the developed HPLC method.
  • Comparison of HPLC results with transmission electron microscopy (TEM) and analytical ultracentrifugation (AUC).

Main Results:

  • The developed anion-exchange HPLC assay accurately determines the empty-to-full capsid ratio.
  • The method shows good comparability with established techniques (TEM, AUC).
  • The HPLC assay offers significantly higher throughput and a lower minimum sample concentration requirement (2.7E11 viral genomes/mL).

Conclusions:

  • A novel, high-throughput anion-exchange HPLC method has been established for rAAV empty-to-full capsid ratio quantification.
  • This method supports rAAV gene therapy process development by providing a scalable and sensitive analytical tool.
  • The assay's improved performance facilitates better purification strategies for viral gene therapy products.