Liofilchem™ MTS™ Penicillin G P 0.002-32, MIC Test strips

Liofilchem™ MTS™ Penicillin G P 0.002-32 is a quantitative tool for determining the Minimum Inhibitory Concentration (MIC) of Penicillin G for bacterial isolates. These MIC test strips are primarily used for antimicrobial susceptibility testing (AST) in clinical microbiology laboratories to assess the effectiveness of Penicillin G against Gram-positive bacteria, including Streptococcus pneumoniae, Staphylococcus spp., and Enterococcus spp.

Key Features:

• MIC Range: 0.002–32 µg/mL, allowing precise determination of Penicillin G susceptibility.
• Target Organisms: Gram-positive bacteria, including Streptococcus pneumoniae, Streptococcus pyogenes, and Staphylococcus aureus.
• Ease of Use: Direct application on Mueller-Hinton Agar.
• Quantitative Results: Provides an exact MIC value for guiding therapeutic decisions.
• Cost-Effective: Simple design eliminates the need for complex dilution setups.
• Reference Standards: Compatible with EUCAST and CLSI guidelines for breakpoint interpretation.

Test Procedure:

1. Preparation of Bacterial Inoculum:
   • Adjust a bacterial suspension to match the 0.5 McFarland standard.
   • Use freshly grown cultures to ensure accuracy.
2. Agar Plate Preparation:
   • Use Mueller-Hinton Agar for non-fastidious organisms or Mueller-Hinton Agar with 5% defibrinated sheep blood for Streptococcus pneumoniae.
   • Inoculate the agar plate with the standardized bacterial suspension using a sterile swab.
3. Application of MTS™ Penicillin G Strips:
   • Place the MTS™ Penicillin G strip on the inoculated agar surface with sterile forceps.
   • Ensure the strip adheres firmly to the agar and forms a tight seal.
4. Incubation:
   • Incubate plates at 35 ± 2°C for 16–20 hours (aerobic atmosphere).
   • For fastidious organisms like S. pneumoniae, incubate in a 5% CO₂ atmosphere.
5. Result Interpretation:
   • After incubation, observe the ellipse of inhibition that intersects the strip.
   • Read the MIC value at the point where the bacterial growth inhibition zone meets the strip.

Quality Control Data:

Quality control strains should be tested regularly to ensure accuracy:

Interpretation of Results:

MIC values should be interpreted using clinical breakpoints provided by EUCAST or CLSI guidelines.

Comparison with Other Brands:

1. Oxoid™ Penicillin MIC Strips:
   • Offers similar MIC determination but with a narrower range for certain pathogens.
   • Liofilchem strips provide better ease of application and a more comprehensive MIC range.
2. Etest® Penicillin Strips:
   • Etest strips are well-established but costlier than Liofilchem™ strips.
   • Liofilchem strips are equally reliable for laboratories aiming for cost-effectiveness without compromising accuracy.
3. Broth Microdilution:
   • Gold standard for MIC determination but requires specialized equipment and time.
   • Liofilchem strips offer an alternative that is simpler and faster, with comparable accuracy for routine clinical use.

Storage Conditions:

• Short-term storage: Store at 2–8°C.
• Long-term storage: Store at -20°C.
• Avoid repeated freeze-thaw cycles to maintain strip integrity.

Conclusion:

The Liofilchem™ MTS™ Penicillin G P 0.002-32, MIC Test Strips provide a reliable, cost-effective, and efficient means to determine the susceptibility of Gram-positive organisms to Penicillin G. The strips align with international standards (EUCAST and CLSI) and are a valuable tool for guiding antimicrobial therapy decisions in clinical microbiology laboratories. Compared to other products, Liofilchem's strips offer competitive accuracy and broader availability at a lower cost, making them an ideal choice for routine testing.