ASTM E2562-22 PDF

Overview

ASTM E2562-22 provides a standard test method for the quantification of Pseudomonas aeruginosa biofilm grown under high shear and continuous flow using the CDC Biofilm Reactor. Developed by ASTM International, this standard offers a detailed laboratory protocol to reproducibly cultivate, sample, and analyze biofilms of Pseudomonas aeruginosa ATCC 700888. Biofilms are organized communities of microorganisms attached to surfaces, and those grown in laboratory reactors often display distinct characteristics compared to suspended bacterial cells. This method is particularly significant for situations where biofilms experience high fluid shear, as such conditions are known to render biofilm bacteria more resistant to antimicrobial treatments.

Key Topics

• Biofilm Cultivation: The standard details operational parameters for growing Pseudomonas aeruginosa biofilms in a CDC Biofilm Reactor, a continuously stirred tank reactor (CSTR) designed to create high wall shear stress.
• Quantification Methods: Procedures are described for biofilm sampling, removing bacteria from surfaces (coupons), and quantifying viable cells by plating methods. Biofilm population density is reported as log10 colony forming units (CFUs) per surface area.
• System Parameters: Critical factors such as reactor volume, nutrient flow rate, rotational speed for shear generation, incubation times, and sampling techniques are specified to ensure reproducibility.
• Sampling and Analysis: The standard includes steps for collecting biofilm samples, dispersing cells for enumeration, and analyzing results using accepted microbiological practices.
• Applicability: While focused on Pseudomonas aeruginosa, the method can also be adapted for biofilms of other microorganisms and serves as a robust protocol for efficacy testing of antimicrobial treatments.

Applications

ASTM E2562-22 is widely applicable across research, industry, and public health contexts where understanding and quantifying biofilm formation under high shear is critical, including:

• Antimicrobial Efficacy Testing: Assessing the resistance of biofilm bacteria to disinfectants or antibiotics, especially in medical device development and healthcare settings.
• Water System Model Studies: Investigating biofilm behavior in potable water systems and other environments subject to high fluid flow.
• Material & Surface Evaluations: Analyzing how different materials or surface coatings influence biofilm growth in industrial or laboratory settings.
• Pharmaceutical and Microbial Research: Studying bacterial adaptation, resistance mechanisms, and testing new antimicrobial agents.
• Regulatory Compliance: Providing standardized data for regulatory agencies when evaluating antimicrobial products or processes.

Researchers, microbiologists, and quality assurance professionals will find this method especially valuable for generating consistent, comparative data on biofilm properties and treatment responses.

Related Standards

• ASTM D5465 – Practices for Determining Microbial Colony Counts from Waters Analyzed by Plating Methods
• ASTM E2756 – Terminology Relating to Antimicrobial and Antiviral Agents
• Standard Methods for the Examination of Water and Wastewater, Method 9050 C.1.a – Preparation of Buffered Dilution Water

For precise terminology, users are advised to consult ASTM E2756. Additionally, this method aligns with internationally recognized principles established by the WTO Technical Barriers to Trade (TBT) Committee.

Keywords: ASTM E2562-22, Pseudomonas aeruginosa, biofilm quantification, CDC Biofilm Reactor, high shear, continuous flow, microbial resistance, antimicrobial efficacy, laboratory test method, biofilm sampling, colony forming units (CFU), water system biofilm.