Microbiology Methods for ERP Review 3-2020

DRAFT 1 - AOAC - 05DEC2018

155

GENE-UP ® Salmonella 2 (SLM 2)

050555 - 02 - 2018-12 - en

3. After incubation, manually mix the contents of the blender bag. Optionally, a sterile technique can be used to remove 1 mL of enriched sample; place it in a pre ‑ labeled microcentrifuge tube. Note: Do not discard the individual enriched samples until the analysis is complete and it has been confirmed that no further testing is required. Enriched samples can be stored at +2°C/+8°C for up to 72 hours before performing the GENE ‑ UP ® assay. LYSIS Note: Refer to the GENE ‑ UP ® Lysis Kit package insert (REF 414057) for general information about the kit. 1. Use the plate map created in the GENE ‑ UP ® Routine software to determine the number of lysis tubes required from the GENE-UP ® Lysis Kit and place the correct number of lysis tubes in the GENE ‑ UP ® Lysis Tube Holder. If less than eight tubes in a strip are required, the strips can be cut apart, and only the used tubes are placed in the GENE ‑ UP ® PCR Tube Holder. Caution: Never open the lysis tubes. If a lysis tube opens or leaks, this should be considered a contamination event. 2. Clip the GENE ‑ UP ® Lysis Tube Holder on the GENE ‑ UP ® Heavy Rack Holder. 3. Transfer 20 μL of sample into the lysis tube. Use the Plate Map from the GENE ‑ UP ® Routine software to pipet each sample into the correct plate position. 4. Remove the GENE ‑ UP ® Lysis Tube Holder from the GENE ‑ UP ® Heavy Rack Holder. 5. Clip the GENE ‑ UP ® Lysis Tube Holder on the Troemner Vortex Mixer Adaptor. 6. Run the vortex mixer at 2200 rpm for 5 minutes. Note: When using the Vortex ‑ Genie ® Pulse, fit it with the GENE ‑ UP ® Lysis Rack Adaptor. Run the vortex at maximum speed for 5 minutes. The maximum speed must be above 2000 rpm. 7. When lysis is complete, remove the GENE ‑ UP ® Lysis Tube Holder from the Troemner Vortex Mixer Adaptor. 8. Clip the GENE ‑ UP ® Lysis Tube Holder into the GENE ‑ UP ® Heavy Rack Holder, and proceed to Final Setup for PCR. The lysate can be stored for up to 3 days at +2°C/+8°C or at -15°C/-31°C for extended storage. FINAL SETUP FOR PCR Before beginning the procedure, put on a clean pair of powder ‑ free latex or nitrile gloves. 1. Use the plate map created in the GENE ‑ UP ® Routine software to determine the number of PCR tubes required from the GENE ‑ UP ® PCR Kit and place the correct number of PCR tubes in the GENE ‑ UP ® PCR Tube Holder. If less than eight tubes in a strip are required, the strips can be cut apart, and only the used tubes are placed in the GENE ‑ UP ® PCR Tube Holder. Note: Only remove the required number of strips from the pouch and carefully reseal the pouch after opening. 2. Use the following steps to remove the transportation caps from the strips: a. Tap on the strips on the bench to ensure the pellets are on the bottom of the tubes. b. Carefully open the caps to prevent spilling the freeze ‑ dried pellet. c. Visually check that the freeze ‑ dried pellets are present at the bottom of each tube. 3. Using a 10 μL Biotix filter pipette tip with a single or multichannel pipette, transfer 10 μL of lysed sample (red) in the appropriate PCR tube. To determine the appropriate plate position for each sample, refer to the Plate Map from the GENE ‑ UP ® Routine software. Note: Do NOT agitate the lysate before aspirating the sample. The solid material must stay at the bottom of the tube. Note: Visually check the tips to confirm the absence of beads, bubbles, and for correct volume of lysate. Note: For negative control procedure, use 10 μL of control buffer instead of lysed sample. 4. Place and seal the strip caps onto each strip tube using the GENE ‑ UP ® Lysis Tube Remover Tool. If less than eight caps are required, the caps can be cut apart, and only the used caps are placed onto the strip tubes. 5. Place the GENE ‑ UP ® PCR Tube Holder containing the PCR tubes in the plate centrifuge. 6. Balance the centrifuge. 7. Spin for 10 seconds. 8. The plate is now ready to be processed in the GENE ‑ UP ® instrument and is stable for 2 hours at +15°C/+25°C. Note: The lysis tubes can be removed from the GENE ‑ UP ® Lysis Tube Holder using the GENE ‑ UP ® Lysis Tube Remover Tool. The GENE ‑ UP ® Lysis Tube Holder is reusable, but the used lysis tubes should be disposed of accordingly. STARTING A RUN AND DISPLAYING RESULTS Please refer to the appropriate GENE ‑ UP ® instrument User Manual for instructions to start a run, view results, and use the GENE ‑ UP ® Routine software. RESULTS AND INTERPRETATION Results are automatically interpreted once the PCR run is completed. The Routine software interprets data for each sample and gives a positive, negative, or inhibited result as indicated in the following table.

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