Overview
ISO/TS 4971:2023 - Nanotechnologies - Performance evaluation of nanosuspensions containing clay nanoplates for quorum quenching - specifies how to evaluate the functional performance of clay-nanoplate nanosuspensions intended for quorum quenching in crop production. The technical specification focuses on measurable characteristics and laboratory methods to assess quorum quenching, antibacterial performance, and quality control of nanosuspensions. It explicitly does not cover safety and environmental risk management (Annex C is informative only).
Key topics and technical requirements
- Scope and definitions
- Terms defined include nanosuspension, clay, nanoplate, critical micelle concentration (CMC), MIC and MBC.
- Characteristics to measure
- Chemical composition (wt %) - ICP‑MS, ICP‑OES or XRF (powder).
- Mineral composition (wt %) - XRD (powder).
- Specific surface area (m2/g) - BET method (ISO 9277).
- Cation exchange capacity (meq/100 g) - ammonium acetate method (ISO/DIS 22171).
- Hydrodynamic size - DLS (ISO 22412) or laser diffraction (ISO 13320) on suspensions.
- Zeta potential - electrophoretic light scattering (ISO 13099‑2); pH must be reported.
- Performance testing
- Quorum quenching ability (QQA) quantified by interaction with representative surfactants (cationic: dodecyltrimethylammonium bromide; non‑ionic: octylphenol ethoxylate; anionic: sodium dodecyl sulfate). Surface‑tension titration (Wilhelmy plate) at CMC is used to detect affinity/adsorption effects.
- Antibacterial activities - determination of Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) following the specified incubation conditions.
- Reporting
- Requirements for test reports and informative annexes linking nanoplate characteristics with antibacterial performance (Annex A) and correlating QQA with antibacterial outcomes (Annex B).
Practical applications and users
- Intended for developers and manufacturers of agro‑nanotechnologies, crop protection product formulators and quality control laboratories who need standardized methods to:
- Evaluate and compare clay nanoplate nanosuspensions for suppression of pathogenic bacteria via quorum quenching.
- Establish product specifications (surface area, CEC, hydrodynamic size, zeta potential) tied to functional antibacterial performance.
- Support R&D, formulation optimization, and internal quality assurance of nanosuspensions for crop production.
- Also useful to academic researchers studying quorum sensing/quenching, nanomaterials’ surface chemistry, and antimicrobial mechanisms in agricultural contexts.
Related standards
Keywords: ISO/TS 4971:2023, clay nanoplates, nanosuspensions, quorum quenching, crop production, antibacterial performance, MIC, MBC, zeta potential, specific surface area, cation exchange capacity.
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