Home › Microbiology › A Semi-quantitative Approach to Assess Biofilm Formation Using Wrinkled Colony Development
Microbiology JoVE (Open Access) Citable · DOI

A Semi-quantitative Approach to Assess Biofilm Formation Using Wrinkled Colony Development

DOI: 10.3791/4035-v
What you'll learn
  • ✓ Monitor biofilm formation patterns using dissecting microscopy over time
  • ✓ Quantify wrinkled colony development as a biofilm formation indicator
  • ✓ Apply semi-quantitative assessment method to bacterial culture samples
  • ✓ Interpret colony morphology changes to evaluate biofilm maturation stages
Protocol

We provide a simple, semi-quantitative method to investigate biofilm formation in vitro. This method takes advantage of the Zeiss stemi 2000-C Dissecting Microscope (with camera attachment) to monitor both the timing and pattern of biofilm formation, as assessed by the development of wrinkled colonies.

Difficulty
beginner
Total time
~5–7 days (initial culture setup through final microscopy assessment)
Biosafety
BSL-1

Steps

1
Characterize bacterial strain and culture conditions

Review initial considerations for strain selection, growth media composition, and incubation parameters that influence biofilm formation phenotype and wrinkled colony development.

▶ 01:32
2
Spot bacterial cells onto solid agar media

Inoculate standardized cell suspensions onto agar plates using a spotting technique to create defined colonies for consistent biofilm formation monitoring.

▶ 03:04
3
Monitor colony morphology using dissecting microscope

Serially photograph colonies at defined intervals using the Zeiss stemi 2000-C microscope with camera attachment to document wrinkle pattern emergence and progression over time.

▶ 05:36
4
Analyze biofilm development patterns and quantify results

Assess timing and extent of wrinkled colony formation across replicates, comparing morphological progression as a semi-quantitative indicator of biofilm maturation.

▶ 08:14
💬 Comments coming soon