Where magnetic solid-phase wash supply and waste removal occur in the instrument
In magnetic-particle solid-phase architectures, coordinate wash addition, mixing and aspiration after magnetic capture to retain solid phase and remove unbound components. Check capture time, wash-head coverage, aspiration height, residue and waste pooling, then evaluate washing by complete-assay background. Configure other solid phases by their instrument workflows.
Product responsibilities in this operation
Diaphragm pumps perform suitable liquid supply or aerated aspiration in this task. Confirm inlet phase, branch location and outlet destination separately, then check each branch's operating point.
Compare DPL30, DPL60 and DPL30H by actual supply load. Wash-head, valve, tubing and container resistance jointly determine installed flow; check the supply window and receiving position together.
DPGL800 handles gas or gas–liquid aspiration permitted by its specific configuration. Check inlet gas content, foam, peak inflow and container vacuum; use a separately suitable solution for continuous liquid-only transfer.
For this task in immunoassay analyzers, confirm solid-phase position and retention target, wash cycles, aspiration height, residue, destination and downstream assay requirements.
Organize the sequence by actual architecture
- Confirm that this workflow uses magnetic-particle solid phase and mark capture position, wash head, aspiration end and waste destination; the corresponding mechanism performs magnetic capture.
- Follow the assay's capture, supply, mixing and aspiration order. The supply pump delivers wash fluid to the designated head; it does not separate the solid phase.
- Control aspiration height by bead-retention position and container shape, checking residual liquid. The waste branch handles peak inflow according to actual inlet gas–liquid conditions.
- Record bead loss, residual liquid and complete-assay background together, then confirm conditions for the next wash or substrate addition.
Define operating conditions for this task
| To define | Details |
|---|---|
| Actual operating conditions | Solid-phase location and retention target, wash cycles, aspiration height, residue, destination and downstream assay requirements |
| Acceptance target | With the actual magnetic capture position and reaction vessel, measure bead loss and residual liquid through the wash sequence. Check wash-head coverage, aspiration height and drainage at peak inflow. |
| Fault localization | Incomplete magnetic capture, aspiration too close to retained beads or poor coverage can remove solid phase or leave unbound material. Waste pooling can also change the next wash or substrate addition. |
Further technical reading
Compare product configurations by the roles on this page
| Product | Configuration option | Conditions to verify |
|---|---|---|
| DPL30 liquid diaphragm pump | Liquid supply or auxiliary circulation | Select by installed resistance, actual wash or working fluid and task window |
| DPL60 liquid diaphragm pump | Liquid supply or auxiliary circulation | Judge by peak demand and installed operating point, not free flow alone |
| DPL30H high-backpressure liquid diaphragm pump | Liquid branches requiring higher backpressure capability | Calculate pressure budget and actual flow first, then confirm interfaces and materials |
| DPGL800 gas–liquid diaphragm pump | Suitable gas–liquid aspiration or container-vacuum branches | Confirm inlet medium and waste architecture; not for continuous liquid-only transfer (100% liquid) |
Validate operation results at the receiver
With the actual magnetic capture position and reaction vessel, measure bead loss and residual liquid through the wash sequence. Check wash-head coverage, aspiration height and drainage at peak inflow.
Evaluate complete-assay background after washing and before accepting the configured sequence. Record bead retention and residual wash fluid separately; adequate delivered wash volume cannot establish either result.
Locate abnormalities and restore the next operation
Incomplete magnetic capture, aspiration too close to retained beads or poor coverage can remove solid phase or leave unbound material. Waste pooling can also change the next wash or substrate addition.
Hold the affected reaction vessels and identify the last completed capture, wash and aspiration steps. Assess bead retention and remaining liquid before repeating any step; restore waste removal and validate the recovered sequence against assay background.
The pump supplies or removes liquid; the magnetic mechanism retains the solid phase. Repeating a wash cannot recover beads already lost to waste.
References
View references (5)
- [1]FOREACH DPL30 liquid diaphragm pump: configurations and specifications
- [2]FOREACH DPL60 liquid diaphragm pump: configurations and specifications
- [3]FOREACH DPL30H high-backpressure liquid diaphragm pump: configurations and specifications
- [4]FOREACH DPGL800 gas–liquid diaphragm pump: configurations and specifications
- [5]Beckman Coulter Access: an assay example of magnetic solid-phase separation, washing and substrate detection