ASTM E2149 - 13a

    Standard Test Method for Determining the Antimicrobial Activity of Antimicrobial Agents Under Dynamic Contact Conditions

    Active Standard ASTM E2149 | Developed by Subcommittee: E35.15

    Book of Standards Volume: 11.08

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    Significance and Use

    4.1 Chemically bonded, antimicrobial agents are not free to diffuse into their environment under normal conditions of use. This test method ensures good contact between the bacteria and the treated fiber, fabric, or other substrate, by constant agitation of the test specimen in a challenge suspension during the test period.

    4.2 The metabolic state of the challenge species can directly affect measurements of the effectiveness of particular antimicrobial agents or concentrations of agents. The susceptibility of the species to particular biocides could be altered depending on its life stage (cycle). One-hour contact time in a buffer solution allows for metabolic stasis in the population. This test method standardizes both the growth conditions of the challenge species and substrate contact times to reduce the variability associated with growth phase of the microorganism.

    4.3 Leaching of an antimicrobial is dependent upon the test conditions being utilized and the ultimate end use of the product. For example, water soluble antimicrobials will be prone to removal from the test surface using the method described in Section 13 but insoluble compounds will not. It is for this reason that the use of the term leaching throughout this document is limited to only the testing conditions described herein. To determine if a compound is immobilized in all conditions or during the end use of the product additional testing may be required.

    4.4 This test method cannot determine if a compound is leaching into solution or is immobilized on the substrate. This test method is only intended to determine efficacy as described in 4.5 and subsequent portions of the method.

    4.5 This test method is intended to evaluate antimicrobial agents that are not removed from the surface by the aqueous testing conditions, as evaluated by Section 13. If an antimicrobial agent that is shown to be removed from the surface by Section 13 is utilized in this test methodology, controls must be included such that appropriate neutralization steps are including during recovery and enumeration.

    4.6 The test is suitable for evaluating stressed or modified specimens, when accompanied by adequate controls.

    Note 1Stresses may include laundry, wear and abrasion, radiation and steam sterilization, UV exposure, solvent manipulation, temperature susceptibility, or similar physical or chemical manipulation.

    1. Scope

    1.1 This test method is designed to evaluate the antimicrobial activity of non-leaching, antimicrobial-treated specimens under dynamic contact conditions. This dynamic shake flask test was developed for routine quality control and screening tests in order to overcome difficulties in using classical antimicrobial test methods to evaluate substrate-bound antimicrobials. These difficulties include ensuring contact of inoculum to treated surface (as in AATCC 100), flexibility of retrieval at different contact times, use of inappropriately applied static conditions (as in AATCC 147), sensitivity, and reproducibility.

    1.2 This test method allows for the ability to evaluate many different types of treated substrates and a wide range of microorganisms. Treated substrates used in this test method can be subjected to a wide variety of physical/chemical stresses or manipulations and allows for the versatility of testing the effect of contamination due to such things as hard water, proteins, blood, serum, various chemicals, and other contaminants.

    1.3 Surface antimicrobial activity is determined by comparing results from the test sample to controls run simultaneously.

    1.4 The presence of an antimicrobial that requires neutralization is determined by the post-test.

    1.5 Proper neutralization of all antimicrobials must be confirmed using Test Methods E1054.

    1.6 This test method should be performed only by those trained in microbiological techniques.

    1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.8 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    AATCC Documents

    AATCC 100 Antibacterial Finishes on Fabrics

    AATCC 147 Antibacterial Activity Assessment of Textile Materials: Parallel Streak Method

    ICS Code

    ICS Number Code 07.100.01 (Microbiology in general); 19.040 (Environmental testing)

    UNSPSC Code

    UNSPSC Code 60104000(Biotechnology and bio chemistry and genetics and microbiology and related materials)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/E2149-13A

    Citation Format

    ASTM E2149-13a, Standard Test Method for Determining the Antimicrobial Activity of Antimicrobial Agents Under Dynamic Contact Conditions, ASTM International, West Conshohocken, PA, 2013,

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