Sartorius Nitrocellulose Transfer Membrane for Western Blotting

Overview

Sartorius Nitrocellulose Transfer Membranes (NC membranes) are high-performance, certified laboratory consumables engineered for reliable and reproducible protein and nucleic acid immobilization in blotting applications. Designed according to the fundamental principles of capillary and electroblotting transfer, these membranes leverage the intrinsic hydrophobic affinity of nitrocellulose for proteins and nucleic acids—enabling passive or electrophoretic capture from SDS-PAGE, agarose, or native gels with minimal background interference. Unlike PVDF or nylon alternatives, Sartorius NC membranes require no pre-wetting in organic solvents such as methanol, reducing procedural variability and eliminating solvent-related safety and disposal concerns. Their uniform pore architecture, consistent thickness, and precisely controlled surface energy ensure high transfer efficiency across molecular weight ranges—making them a reference-grade choice for quantitative Western, Northern, and Southern blotting in academic, clinical, and regulatory environments.

Key Features

• 100% pure nitrocellulose matrix—no binders, plasticizers, or surfactants—to maximize binding capacity (>200 µg/cm² IgG) and minimize non-specific interactions
• Two standardized pore sizes: 0.22 µm for low-MW proteins (<20 kDa) and short nucleic acid fragments (<300 bp); 0.45 µm for high-MW proteins (>20 kDa) and longer DNA/RNA sequences (>300 bp)
• No methanol activation required—simple water-wetting followed by immersion in standard transfer buffer (e.g., Tris-glycine or CAPS) ensures rapid, uniform hydration and optimal electrotransfer kinetics
• Roll format (30 cm × 3 m) enables precise, on-demand cutting—reducing waste and supporting scalable throughput in high-volume core facilities
• Manufactured in Germany under strict quality control aligned with ISO 9001 and ISO 13485 frameworks; lot-specific certificates of analysis available upon request
• Compatible with chemiluminescent, fluorescent, and colorimetric detection systems—including HRP-, AP-, and IR-dye-conjugated secondary reagents

Sample Compatibility & Compliance

Sartorius NC membranes demonstrate broad compatibility with common electrophoretic systems (e.g., Mini-PROTEAN, Hoefer Mighty Small, and Life Technologies Novex units) and transfer apparatuses (semi-dry and wet-tank formats). They support both passive capillary transfer (overnight) and rapid electrotransfer (30–90 min at constant current or voltage). The membranes meet performance criteria outlined in ASTM E2576 (Standard Guide for Western Blotting), ISO/IEC 17025 (for accredited testing labs), and USP <1043> (on membrane-based assay validation). While not a regulated medical device, their documented lot-to-lot consistency and absence of leachables make them suitable for use in GLP studies and early-phase biopharmaceutical characterization where data integrity is critical.

Software & Data Management

As a consumable—not an instrument—Sartorius NC membranes do not incorporate embedded electronics or software interfaces. However, they integrate seamlessly into digital laboratory workflows governed by LIMS (Laboratory Information Management Systems) and electronic lab notebooks (ELNs). Each roll bears a unique lot number and expiry date, enabling full traceability in audit-ready environments. When used in conjunction with imaging platforms (e.g., Azure Biosystems Sapphire, Bio-Rad ChemiDoc, or LI-COR Odyssey), the membranes’ low background and high signal fidelity support automated band quantification using compliant software modules validated per FDA 21 CFR Part 11 requirements (e.g., with audit trail, electronic signature, and version-controlled analysis protocols).

Applications

• Transfer of denatured proteins from SDS-PAGE gels for immunodetection via Western blotting—particularly suited for monoclonal antibody-based assays requiring high specificity
• Nucleic acid transfer from agarose or polyacrylamide gels for hybridization-based detection (Northern/Southern blotting), including miRNA and fragmented genomic DNA analysis
• Validation of recombinant protein expression, post-translational modification profiling (e.g., phosphorylation, ubiquitination), and host-cell protein clearance studies in biomanufacturing QC
• Development and verification of diagnostic immunoassays where membrane consistency directly impacts limit-of-detection and inter-laboratory reproducibility
• Teaching laboratories requiring robust, user-friendly consumables that reduce protocol failure rates among novice users

FAQ

Do Sartorius NC membranes require methanol pre-wetting?
No. Unlike some legacy NC formulations, Sartorius membranes are optimized for direct water-wetting—eliminating methanol handling while maintaining full transfer efficiency.
What is the shelf life of unopened rolls?
Typically 36 months from manufacture when stored at 15–25°C in original packaging; see lot-specific CoA for exact expiry.
Can these membranes be stripped and re-probed?
Yes—standard stripping buffers (e.g., glycine-HCl pH 2.2 or commercial mild reagents) effectively remove antibodies without compromising membrane integrity for ≥3 rounds of reprobing.
Are there differences between the 0.22 µm and 0.45 µm variants beyond pore size?
Yes: the 0.22 µm grade exhibits higher binding density but slightly reduced mechanical strength during high-current electrotransfer; the 0.45 µm variant offers greater durability for large-format or repeated use applications.
Is lot-specific validation data available?
Yes—certificates of analysis (CoA) include binding capacity, pore size distribution (via bubble point testing), and endotoxin levels (<0.25 EU/mL), available upon request with purchase order reference.