Introduction

Positively charged nylon membranes are specialized polyamide filters that have been surface-modified to carry permanent positive (+) charges. This functional modification allows the membrane to electrostatically attract and retain negatively charged particles, proteins, nucleic acids, and other biomolecules in liquid streams. They are widely used for analytical filtration, sample purification, and charge-based separation processes.

Material Structure Analysis

• Base material: polyamide (nylon 6 or nylon 66) with hydrophilic properties.
• Surface functionalized with positively charged groups such as quaternary amines.
• Maintains uniform pore size and high mechanical stability after modification.
• High surface energy allows selective adsorption of anionic particles and molecules.

Uses and Advantages

1. Efficient removal of negatively charged contaminants such as endotoxins, viruses, and DNA fragments.
2. Pre-filtration and polishing of biopharmaceutical fluids to improve purity.
3. High adsorption capacity with controlled retention for analytical sample preparation.
4. Enhances selectivity when combined with size-based filtration mechanisms.

Application Industries

• Pharmaceuticals — removal of negatively charged impurities from protein or peptide solutions.
• Biotechnology — downstream processing of vaccines and biological samples.
• Laboratory research — nucleic acid purification and buffer clarification.
• Environmental testing — filtration of charged microparticles and colloids from water samples.

Key Features

1. Permanent positive surface charge facilitating electrostatic adsorption.
2. High chemical and mechanical stability consistent with standard nylon membranes.
3. Low extractables ensuring purity in sensitive biological applications.
4. Effective removal of anions and charged particulates at neutral pH conditions.
5. Compatible with aqueous and low-solvent systems.

Conclusion

Positively charged nylon membranes provide an advanced filtration solution that combines mechanical strength with electrostatic selectivity. They are ideal for capturing negatively charged biomolecules and ions, ensuring cleaner, more refined results in pharmaceutical, biotechnology, and analytical filtration applications.

Purchase Suggestion

Contact our team for expert support on selecting positively charged nylon membranes for your biopharmaceutical or laboratory filtration needs.