CD-SINS Assay for Protein Colloidal Stability
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Solution Overview
Problem
Current methods for assessing protein colloidal interactions are inadequate for rapidly determining the dynamic range of a protein's self-association under varying conditions, leading to instability at high concentrations and aggregation issues during formulation and storage.
Innovation Solution
Concentration-dependent self-interaction nanoparticle spectroscopy (CD-SINS) measures the propensity of proteins to self-assemble across a range of concentrations, ionic strengths, and pH conditions, using gold nanoparticles to assess absorbance intensity ratios and predict stability at high concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If protein concentration is increased to achieve therapeutically effective doses, then the dose strength is improved, but colloidal interactions increase causing aggregation and instability
Solution Approach 1:
The patent applies preliminary action by measuring the second virial coefficient (B22) early in the discovery and development process to predict colloidal stability. This allows selection of protein variants with favorable self-interaction properties before committing to large-scale production and formulation, preventing aggregation issues from manifesting later in development.
Solution Approach 2:
The patent employs parameter changes by systematically varying protein sequence, pH, ionic strength, and temperature to measure how these parameters affect B22 values. This enables identification of optimal formulation conditions that maintain protein stability at high concentrations by adjusting these physical-chemical parameters.
2Measurement precision
If current virial coefficient measurement methods are used, then measurement accuracy is maintained, but assessment speed and throughput are insufficient for rapid screening
Solution Approach 1:
The patent applies segmentation by dividing the comprehensive stability assessment into multiple independent measurements at different concentrations, pH values, and temperatures. Each measurement contributes to the overall B22 characterization, allowing parallel processing and accelerated data collection while maintaining measurement accuracy through systematic analysis of segmented experimental data.
Solution Approach 2:
The patent replaces traditional mechanical/physical measurement methods (such as analytical ultracentrifugation or light scattering) with surface plasmon resonance (SPR) technology. SPR provides rapid, real-time measurement of protein self-interactions with high throughput capability, substituting slower conventional techniques while maintaining or improving measurement precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
CD-SINS enables the selection of proteins for high-concentration formulations with improved stability and reduced aggregation, facilitating the development of biopharmaceuticals with suitable rheology and viscosity for effective administration.
Implementation Method 1
measures the light transmitted through the sample; and calculating the first absorbance intensity ratio of the sample
Data Source
AI summary
Methods for producing high concentration protein formulations having high stability are provided. Assays for selecting proteins and formulation conditions that have high self-repulsive attributes are used as an early step in the manufacturing process. Specifically, a protein concentration-dependent self-interaction nanoparticle spectroscopy method is employed as a protein colloidal interaction assay.