Overview
ASTM E2865-12(2022) provides comprehensive guidance for the measurement of electrophoretic mobility and zeta potential in nanosized biological materials. Developed by ASTM Committee E56 on Nanotechnology, this standard focuses on systems containing proteins, DNA, liposomes, and other organic materials with particle sizes typically under 100 nm. Such measurements are critical for understanding surface charge properties, stability, and the behavior of nanomaterials in biological and pharmaceutical applications.
This guide standardizes terminology, outlines key measurement considerations, and reinforces best practices for ensuring accuracy and consistency. All measurements are to be reported in SI units. As an internationally recognized standard, ASTM E2865-12(2022) assists researchers and industry professionals in reliably characterizing nanoscale biological materials, which is essential for quality control, formulation stability, and regulatory compliance.
Key Topics
- Electrophoretic Mobility: Describes the movement of dispersed nanoparticles under an applied electric field, a fundamental property for characterizing colloidal stability and interaction in biological matrices.
- Zeta Potential: Defines the electrical potential at the slipping plane of a nanoparticle and its surrounding medium, serving as an indicator of particle stability in suspension.
- Sample Preparation: Covers aspects such as pH adjustment, concentration management, and the use of appropriate buffers and reagents for biological samples.
- Instrument Verification: Emphasizes the importance of calibrating equipment according to traceable standards, such as those provided by NIST, to ensure reliable results.
- Data Reporting: Guides users on documenting measurement conditions (pH, temperature, composition, etc.) to ensure reproducibility and meaningful data interpretation.
- Safety and Good Laboratory Practice: Encourages adherence to health, safety, and environmental protocols due to the complex nature of biological nanomaterials and measurement procedures.
Applications
The ASTM E2865-12(2022) standard has wide applicability in industries and research settings working with biological nanomaterials, including:
- Biopharmaceutical Development: Assessing charge and stability of protein drugs, antibody formulations, or nucleic acid-based therapies at the nanoscale.
- Biomedical Research: Investigating interactions of DNA, liposomes, and proteins with other biomolecules, which influence aggregation, transport, and therapeutic efficacy.
- Nanotechnology and Materials Science: Quality control of nanocarriers, biosensors, and nanostructured drug delivery systems.
- Food and Cosmetic Industries: Characterizing emulsions, dispersions, and nanoparticles to enhance product stability and performance.
- Environmental Science: Evaluating the mobility and fate of nanoparticles in environmental or biological systems.
Routine measurement of zeta potential and electrophoretic mobility supports formulation optimization and provides insight into colloidal stability, helping mitigate issues like aggregation and precipitation in product development.
Related Standards
For an integrated approach to zeta potential characterization and nanoparticle analysis, ASTM E2865-12(2022) should be used alongside these standards and guides:
- ISO 13099-1 & ISO 13099-2: Colloidal Systems - Methods for Zeta-Potential Determination (covering electroacoustic, electrokinetic, and optical methods)
- ISO 13321: Particle Size Analysis - Photon Correlation Spectroscopy for nanoparticle sizing and mobility
- ASTM E2456: Standard Terminology Relating to Nanotechnology
- NIST SRM 1980: Positive Electrophoretic Mobility Standard for instrument calibration and quality assurance
These documents collectively reinforce best practices for accurate nanomaterial characterization, enabling reproducibility and global comparability of zeta potential and electrophoretic mobility data.
Keywords: electrophoretic mobility, zeta potential, nanosized biological materials, protein mobility, nanotechnology standard, nanoparticle characterization, colloidal stability, ASTM E2865, biological sample analysis, SI units