Dual-Mode Sample Preparation Composition for Small Molecule Removal
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Solution Overview
Problem
Existing methods for removing small molecules such as unreacted labels and chemical agents from larger biomolecules are time-consuming and inefficient, leading to issues during downstream analysis, particularly in fluorescent imaging and bioconjugation processes.
Innovation Solution
Compositions comprising size exclusion supports and moieties that associate with small molecules, allowing for rapid separation of small molecules from larger biomolecules using gravity, centrifugal force, or pressure differentials, thereby reducing their quantity in a single step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dialysis is used to remove unreacted dyes and small molecules from proteins, then small molecules are removed, but the process takes twelve to fourteen hours and requires two to three buffer changes
Solution Approach 1:
The patent combines size exclusion chromatography and ion exchange chromatography into a single dual-mode resin system. The resin simultaneously provides size-based separation (excluding large biomolecules) and charge-based binding (capturing small molecules through ion-exchange groups), eliminating the need for sequential dialysis and chromatography steps
Solution Approach 2:
The resin is designed with multiple functional groups that provide both size exclusion properties and ion exchange capabilities in a single material. This multi-functional resin can handle both large biomolecule separation and small molecule capture simultaneously, replacing multiple specialized steps with one universal process
2Reliability
If size exclusion chromatography is used to remove small molecules, then small molecules are separated, but the process requires complex and expensive chromatography instrumentation and takes thirty minutes to several hours
Solution Approach 1:
The patent employs disposable spin columns containing the dual-mode resin instead of expensive, complex chromatography systems like AKTA. The simple spin column design eliminates the need for sophisticated instrumentation, pumps, and column equilibration systems while providing effective separation
Solution Approach 2:
The patent replaces complex mechanical chromatography systems with simple centrifugal or gravity-based spin columns. Instead of using pumps, valves, and complex flow control mechanisms, the system uses centrifugal force or gravity to drive sample through the resin bed
3Reliability
If ion exchange resins are used for separating small molecules, then small molecules are removed, but protein recovery is poor and multiple elution steps are required
Solution Approach 1:
The patent segments the separation process into two distinct mechanisms within one resin: size exclusion (which preserves protein integrity and allows easy recovery) and ion exchange (which captures small molecules). The size exclusion component ensures proteins pass through without denaturation, while the ion exchange component binds small molecules that can be separately eluted
Solution Approach 2:
The dual-mode resin acts as an intermediary system where the size exclusion matrix protects proteins from harsh ion exchange conditions. Proteins pass through the size exclusion network intact, while small molecules are captured by ion exchange groups, allowing selective removal of small molecules without compromising protein recovery
4Ease of operation
If desalting resins are used for buffer exchange and desalting, then buffer exchange is achieved, but the capacity to remove small molecules such as dyes, labels and conjugates is very limited
Solution Approach 1:
The patent creates a composite resin material that combines size exclusion properties (for buffer exchange and desalting) with ion exchange functionality (for capturing charged small molecules like dyes and labels). This composite structure provides both the ease of buffer exchange and the enhanced capacity to remove diverse small molecule contaminants
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
The method significantly reduces the time and cost associated with small molecule removal, enabling cleaner downstream processing of biomolecules by effectively separating and reducing the quantity of small molecules in a single step.
Implementation Method 1
compositions comprising size exclusion supports and moieties that associate with small molecules, allowing for rapid separation of small molecules from larger biomolecules
Implementation Method 2
allowing for rapid separation of small molecules from larger biomolecules using gravity, centrifugal force, or pressure differentials
Implementation Method 3
allowing for rapid separation of small molecules from larger biomolecules using gravity, centrifugal force, or pressure differentials
Data Source
AI summary
The present specification relates to compositions, devices, apparatus, methods, kits and systems for sample preparation (e.g., separation, reduction or removal of small molecules from biomolecules in a sample). Exemplary small molecules that can be separated, reduced or removed have a molecular weight range of <2000 Da. and may include, but are not limited to, dyes, biotin, affinity tags, crosslinkers, reducing agents, labels, nanoparticles, radioactive ligands, mass tags, unreacted molecules and combinations, intermediates and derivatives of the foregoing. Exemplary biomolecules present in a sample, include but are not limited to, proteins, glycoproteins, antibodies, peptides, nucleic acids, polysaccharides, carbohydrates and lipids. Methods, compositions, kits, devices, apparatus and systems of the disclosure may advantageously provide superior separation of small molecule contaminants and additionally reduce time and expenses related to separation of small molecules from larger biomolecules in samples. Biomolecules separated as set forth herein are amenable to better downstream processing.