Automated pH Buffer System for Protein Stability Analysis
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Solution Overview
Problem
Current methods for determining the ideal storage formulation for proteins as pharmaceutical drugs are cumbersome and lack efficient systems to evaluate stability across varying parameters like temperature, solvent, ligands, excipients, pH, and salt concentration, particularly due to the limitations of temperature and chemical denaturation methods.
Innovation Solution
A system and method for automatically creating buffer solutions with desired pH values using known buffer solutions and mathematical relationships to generate denaturation graphs that demonstrate protein stability, allowing for the determination of optimal storage formulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature denaturation method is used to measure protein stability, then the protein structure disruption is achieved, but the measurement must be extrapolated by more than 25°C to understand effects at physiological and storage temperatures
Solution Approach 1:
The patent changes the measurement parameter from temperature-based physical denaturation to chemical denaturation using urea or guanidine hydrochloride. This allows direct measurement of protein stability at physiological and storage temperatures without extrapolation, as the chemical denaturants can be used at any desired temperature range including 4°C, 25°C, and 37°C
2Measurement precision
If temperature denaturation is used, then protein denaturation is achieved, but most proteins undergo irreversible denaturation at temperatures at or above 60°C
Solution Approach 1:
The patent replaces the thermal/mechanical denaturation approach with a chemical denaturation approach using urea or guanidine hydrochloride. This substitution allows measurement of thermodynamic stability at physiological temperatures without causing irreversible protein damage, as the chemical denaturants can be removed or the protein can be refolded, enabling meaningful calculations of ΔG at 4°C, 25°C, and 37°C
3Adaptability or versatility
If chemical denaturants are used to measure protein stability, then measurements can be done at any desired temperature, but the process requires evaluation of hundreds of buffer, ligand, and excipient conditions
Solution Approach 1:
The patent segments the complex formulation evaluation process into systematic components by using buffer solutions with predetermined pH values and preparing multiple solutions with different pH levels. This segmentation allows the evaluation of hundreds of conditions to be organized and managed through structured buffer systems, reducing the complexity of evaluating buffer, ligand, and excipient combinations while maintaining the ability to measure stability across temperature ranges
4Measurement precision
If multiple buffer solutions with different pH values are prepared manually, then accurate pH-specific denaturation graphs can be generated, but the process is time-consuming and labor-intensive
Solution Approach 1:
The patent applies preliminary action by using buffer solutions with predetermined pH values that are prepared in advance. Instead of manually adjusting pH for each experiment, the buffer solutions are pre-prepared at specific pH levels (e.g., pH 4, 5, 6, 7, 8, 9, 10), allowing rapid selection and use in denaturation experiments. This significantly reduces the time and labor required while maintaining accurate pH-specific measurements
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
Enables rapid and accurate assessment of protein stability across different conditions, facilitating the identification of stable formulations for storage and shipment by automating the creation of buffer solutions and denaturation graphs, thus overcoming the limitations of existing methods.
Implementation Method 1
a buffer solution having a desired pH value is created. In one embodiment, two known buffer solutions, each with a different predetermined pH value, are mixed in a predetermined ratio
Implementation Method 2
a second way to measure protein stability is through the use of chemical denaturants, such as urea or guanidine hydrochloride
Implementation Method 3
While the preferred embodiment described in this application utilizes fluorescence emission (intrinsic or extrinsic) as a way to determine the degree of denaturation or unfolding of a protein
Data Source
AI summary
A system and method for creating a buffer solution having a desired pH value is disclosed. The method uses two known buffer solutions, each with predetermined pH values, and determines a mathematical relationship which defines the amount of each known buffer solution needed to create the buffer solution with the desired pH. This method can then be used to create one or more denaturation graphs, which demonstrate the stability of a protein at a given pH level.