AQR™ Caps Were Tested Under Standard Autoclave Conditions
AQR™ screw caps were evaluated using a standard gravity autoclave cycle consisting of:
- Approximately 30 minutes total cycle time
- 121.1°C (250°F)
- 15-minute sterilization phase
- 10-minute drying phase
Following autoclaving, the caps maintained their intended performance characteristics.
Mechanical Performance After Autoclaving
Testing showed that AQR™ caps:
- Did not warp or deform
- Maintained proper thread engagement
- Preserved seal integrity
- Continued to function as designed
This allows AQR™ caps to be used in sterilization workflows without sacrificing closure performance.
Chromatographic Cleanliness After Sterilization
Chromatographic testing demonstrated that autoclaving did not introduce additional extractables from the cap or septa materials.
Comparisons of chromatograms before and after sterilization showed:
- No new extractable peaks
- No increase in background interference
- No observable chromatographic artifacts
These results are particularly important for:
- HPLC
- UHPLC
- LC-MS
- LC-MS/MS
- Other high-sensitivity analytical methods
Can RSA™ and AQ™ Vials Also Be Autoclaved?
RSA™ and AQ™ Autosampler Vials may also be autoclaved using similar conditions, allowing laboratories to create a complete sterilizable vial and closure system when required.
As with any regulated or validated procedure, laboratories should verify compatibility with their specific methods and quality requirements.
Best Practices for Autoclaving Autosampler Caps and Vials
Validate Any Alternative Sterilization Cycle
If using:
- Pre-vacuum cycles
- Extended sterilization cycles
- Repeated sterilization cycles
perform verification studies before routine implementation.
Verify Chromatographic Performance
After sterilization:
- Run solvent blanks
- Run matrix blanks when appropriate
- Confirm no new chromatographic background features are present
Confirm Closure Performance
After cooling and drying:
- Verify cap fit
- Confirm proper torque and sealing performance
- Inspect for visible damage or deformation
Maintain Quality Records
For regulated environments:
- Record autoclave conditions
- Maintain lot traceability
- Document verification testing
Frequently Asked Questions
Do AQR™ Septa Need to Be Replaced After Autoclaving?
Based on testing, replacement is not typically required if:
- No visible damage is present
- The septum continues to seal properly
- Verification testing confirms acceptable performance
Replace septa if physical damage, leakage, or sealing issues are observed.
Can the Entire Vial and Cap Assembly Be Autoclaved?
Yes. AQR™ caps and RSA™ or AQ™ Autosampler Vials can generally tolerate the validated gravity-cycle conditions described above.
When sterilizing assembled containers:
- Ensure caps are properly seated
- Allow adequate drying time
- Prevent moisture accumulation beneath the septa
Key Takeaways
- AQR™ Caps can be autoclaved using a standard 121.1°C gravity cycle.
- Testing showed no warping, deformation, or loss of sealing performance.
- No additional extractable peaks were observed after sterilization.
- RSA™ and AQ™ Autosampler Vials may also be autoclaved under similar conditions.
- Verification testing is recommended when implementing sterilization procedures in regulated methods.
