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Microbiology JoVE (Open Access) Citable · DOI

Antimicrobial Characterization of Advanced Materials for Bioengineering Applications

DOI: 10.3791/57710-v
What you'll learn
  • ✓ Apply agar disk diffusion test to measure antimicrobial material activity
  • ✓ Perform ISO 22196:2007 contact method for surface antimicrobial assessment
  • ✓ Prepare and validate microbial suspensions for testing protocols
  • ✓ Compare two complementary antimicrobial characterization methods
Protocol

We present a protocol for the antimicrobial characterization of advanced materials. Here, the antimicrobial activity on material surfaces is measured by two methods that complement each other: one is based on the agar disk diffusion test, and the other is a standard procedure based on the ISO 22196:2007 norm.

Difficulty
intermediate
Total time
~4–6 hours per material sample (including incubation periods)
Biosafety
BSL-1

Steps

1
Prepare advanced material samples for testing

Cut and sterilize material samples according to protocol specifications. Ensure uniform dimensions and proper handling to avoid contamination prior to antimicrobial testing.

▶ 00:46
2
Perform agar disk diffusion test on materials

Place material samples on inoculated agar plates and incubate to measure inhibition zones. This diffusion-based method qualitatively assesses antimicrobial activity around material surfaces.

▶ 01:16
3
Verify microbial suspension concentration and purity

Prepare and standardize microbial suspensions by measuring optical density and confirming culture purity. Ensure suspensions meet required specifications before contact testing.

▶ 03:27
4
Measure antimicrobial activity using ISO 22196:2007 contact method

Inoculate material surfaces with standardized microbial suspension and incubate under controlled conditions. Quantify surviving bacteria to assess antimicrobial efficacy per ISO standard protocol.

▶ 04:40
5
Compare diffusion and contact method results

Analyze and interpret data from both complementary methods to validate antimicrobial characterization. Discuss how each method provides distinct information about material performance.

▶ 06:44
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