Integrated Sample Preparation Column for Low-Loss Protein Purification
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Solution Overview
Problem
Current methods for protein purification and concentration are cumbersome, time-consuming, and result in significant sample loss due to the need for multiple device transfers and pipetting steps, especially for small sample volumes.
Innovation Solution
A centrifugal sample preparation device with integrated reservoir, column, and filtration system that allows for bind, wash, elute, buffer exchange, and concentration processes without sample transfer, using a retractable tip design and biasing member to minimize sample loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If multiple device transfers and pipetting steps are used for protein purification, then purification can be performed, but sample loss increases significantly
Solution Approach 1:
The patent combines multiple purification functions (binding, washing, elution, concentration) into a single integrated device. The device includes a reservoir for beads, a collection chamber for sample, and integrated filtration membranes, eliminating the need to transfer samples between multiple separate devices and thereby minimizing sample loss.
Solution Approach 2:
The single device performs multiple functions: it can bind proteins to beads, wash the beads, elute the bound proteins, and concentrate the eluted sample. This multi-functional design replaces what previously required several separate devices and操作步骤, reducing sample loss while maintaining comprehensive purification capability.
2Productivity
If conventional purification protocols are used, then protein binding can be achieved, but processing time increases to about 45 minutes
Solution Approach 1:
The device allows beads to be pre-loaded into the reservoir before sample addition. The reservoir and bead arrangement are prepared in advance, so when the sample is added, binding can begin immediately without setup delays. This preliminary preparation reduces the overall processing time while maintaining effective protein binding.
Solution Approach 2:
The integrated design allows continuous processing through all steps (binding, washing, elution, concentration) without interruption or transfer between devices. The sample remains in the same device throughout, enabling continuous operation and reducing total processing time compared to conventional protocols that require multiple discrete steps with transfer times.
3Ease of operation
If magnetic beads are used with manual pipetting, then protein purification can be performed, but the workflow becomes cumbersome with about 8 pipette steps per sample
Solution Approach 1:
The device merges the functions of bead containment, sample processing, and fluid management into a single integrated system. The reservoir holds magnetic beads, the collection chamber receives sample, and integrated membranes handle filtration. This consolidation eliminates the need for multiple separate pipetting operations between different containers, simplifying the workflow.
Solution Approach 2:
The device design allows buffers and samples to be added directly to the collection chamber where they automatically interact with the beads in the reservoir. The device structure itself manages the fluid pathways, reducing the need for manual pipetting to transfer fluids between separate containers. The system is designed to self-manage the purification process with minimal manual intervention.
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 efficient, high-recovery protein purification with reduced incubation time, minimizing sample loss and requiring only a single centrifuge spin for buffer exchange, thus improving overall workflow efficiency and sample recovery.
Implementation Method 1
These devices are most commonly used in centrifugal-separator instruments
Implementation Method 2
Magnets are used to hold the beads to the side of the sample tube
Implementation Method 3
a porous frit positioned over the open bottom. Instead of using pipettes to remove fluids from the sample tube, a bench top centrifuge is used to drive the fluids through the frit
Implementation Method 4
There is a class of protein purification protocols that use antigen-protein affinity to separate proteins of interest from a mixed sample
Data Source
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Figure 2
AI summary
A sample preparation device comprises a reservoir/exchange member (12) including a sample reservoir (14) and a column in fluid communication with the sample reservoir (14). The column has a holder region (20) and a region (22) having a finned geometry tapering radially from a relatively thick upper portion (22a) to a relatively thin lower portion (22b) that converges in an axially extending stem (23) having an open bottom. A filter (50) is or is capable of being sealingly engaged to the holder region (20). The filter (50) includes spaced membranes. The region (22) having a finned geometry positions between the spaced membranes.