Single Reactor Integrating Affinity Purification and Enzymatic Digestion
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Solution Overview
Problem
Current methods for protein analysis, such as immunoassays and mass spectrometry, face challenges in efficiently purifying and digesting proteins due to long development times, difficulty in interrogating protein isoforms, and inefficiencies in solution-based digestion processes, which require tedious sample pretreatment and separate steps for separation and digestion.
Innovation Solution
A single reactor format that combines affinity purification and enzymatic digestion, where an affinity selector and enzyme are co-immobilized or partitioned with controlled access, allowing for simultaneous purification and digestion without pretreatment, using techniques like temperature control, reversible inhibitors, and pH management to keep the enzyme inactive during purification and activate it for digestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate steps for affinity purification and enzymatic digestion are used, then each step can be optimized independently, but the overall sample preparation time and process complexity increase significantly
Solution Approach 1:
The patent combines affinity purification and enzymatic digestion into a single integrated reactor system. The affinity selector and enzyme are co-immobilized on the same support matrix, allowing both functions to occur in the same vessel without requiring separate purification and digestion steps, thereby reducing sample preparation time while maintaining purification efficiency.
Solution Approach 2:
The single reactor system performs multiple functions simultaneously: it acts as both an affinity purification device and an enzymatic digestion reactor. The co-immobilized affinity selector and enzyme work together in the same system to achieve both target protein capture and subsequent digestion, eliminating the need for separate dedicated devices for each function.
2Ease of operation
If solution-based enzymatic digestion is used, then the enzyme is easily accessible to substrates, but complete digestion is kinetically unfavorable and autolysis occurs
Solution Approach 1:
The enzyme is divided into numerous small immobilization sites distributed across the support matrix surface. This segmentation increases the total surface area available for enzyme-substrate interactions while maintaining good substrate accessibility. The distributed immobilization prevents autolysis by isolating enzyme molecules at separate locations on the matrix.
Solution Approach 2:
The patent uses porous support materials with controlled pore sizes that allow substrate proteins to access immobilized enzymes effectively. The porous structure provides high surface area for enzyme immobilization while maintaining porosity that enables substrate diffusion and product release, achieving both accessibility and complete digestion.
3Adaptability or versatility
If multiple separate reactors are used for purification and digestion, then each reaction can be independently controlled, but the device complexity and sample handling requirements increase
Solution Approach 1:
The patent merges the affinity purification reactor and enzymatic digestion reactor into a single integrated device. The affinity selector and enzyme are co-immobilized in the same reactor vessel, eliminating the need for separate purification and digestion reactors. This reduces device complexity and minimizes sample transfer operations while maintaining independent control over the purification and digestion processes through sequential operation.
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
This approach enables fast, robust, and efficient production of ready-to-analyze peptides for mass spectrometry, reducing time and complexity in sample preparation by integrating purification and digestion in a single device, ensuring complete conversion of substrates to products and minimizing autolysis effects.
Implementation Method 1
an affinity selector which retains and purifies at least one analyte through the physical properties of the analyte
Implementation Method 2
an enzyme reactor which performs site-specific cleavage of the analyte into smaller fragments
Data Source
AI summary
This disclosure provides a single reactor that accommodates an affinity selector to separate analytes of interest, and an enzyme reactor that digest the analyte to suitable peptides for mass spectrometry. The single reactor formats described herein accommodate workflows wherein separation precedes digestion as well as workflows wherein digestion precedes separation selection.