Millipore EFFU Sterile Filtration Cup for Microbial Limit Testing

Overview

The Millipore EFFU Sterile Filtration Cup is an engineered single-use device designed specifically for membrane filtration-based microbial limit testing of liquid pharmaceuticals, biologics, water for injection (WFI), purified water, bulk intermediates, and final drug products. It operates on the principle of quantitative microbiological recovery via vacuum- or pressure-driven filtration through a defined-pore-size membrane—typically 0.45 µm or 0.22 µm mixed cellulose ester (MCE)—followed by either direct membrane transfer to solid agar media or in-cup liquid enrichment culture. Its architecture integrates fluidic efficiency, membrane integrity preservation, and operator safety into a unified platform compliant with pharmacopoeial requirements for sterility assurance and colony-forming unit (CFU) enumeration.

Key Features

• Optimized membrane flatness retention: Precision-matched funnel-to-base geometry ensures uniform contact between the filter membrane and the underlying support pad during filtration, minimizing wrinkling and maximizing surface area availability for microbial adhesion and subsequent recovery.
• Reduced contamination risk: Integrated vented cover provides continuous airflow during filtration while preventing particulate ingress; elimination of manual tweezers for membrane handling mitigates direct contact with the filtration zone.
• Ergonomic workflow integration: Designed in collaboration with global QC laboratories across pharmaceutical, biotech, and contract manufacturing organizations to streamline filtration-to-culture transitions—reducing hands-on time per sample by up to 30% versus conventional reusable assemblies.
• Material compatibility assurance: All wetted components are certified non-pyrogenic and extractables-tested per USP and ISO 10993-5, ensuring no interference with microbial growth or assay validity.
• Scalable configuration options: Available in 100 mL and 250 mL funnel volumes, with black or white grid-patterned MCE membranes for enhanced colony visualization under standard incubation conditions.

Sample Compatibility & Compliance

The EFFU cup accommodates a broad range of low-viscosity aqueous and mildly solvated pharmaceutical solutions—including buffers, saline preparations, ophthalmic formulations, and parenteral dosage forms—without membrane clogging or hydrophobic blockage. It meets critical regulatory expectations for method suitability validation per ICH Q5C and USP , supporting both total aerobic microbial count (TAMC) and total combined yeasts and molds count (TYMC) determinations. Its EO-sterilized, individually wrapped packaging conforms to ISO 11737-1 for bioburden estimation and supports audit readiness for FDA 21 CFR Part 11–aligned electronic batch records when used within validated LIMS-integrated workflows.

Software & Data Management

While the EFFU cup itself is a hardware-only consumable, its use is fully compatible with digital quality management systems (QMS) and laboratory information management systems (LIMS) that support structured data capture for microbial limit test protocols. When deployed alongside Millipore’s Steritest® Symbio or other automated filtration platforms, it enables traceable lot-level documentation—including membrane lot number, EO sterilization cycle ID, and expiration date—integrated into electronic signatures and audit trails compliant with ALCOA+ principles and 21 CFR Part 11 Annex 11 requirements.

Applications

• Routine release testing of sterile and non-sterile liquid pharmaceuticals per USP and Ph. Eur. 2.6.12
• Environmental monitoring sample analysis (e.g., compressed gas, HVAC condensate)
• Water system validation and routine monitoring (PW, WFI, SW)
• Method transfer and validation studies requiring high inter-laboratory reproducibility
• Accelerated stability testing where rapid microbial enumeration supports shelf-life determination

FAQ

Is the EFFU cup suitable for use with viscous or protein-rich samples?

Yes—when paired with appropriate pre-filtration steps or diluted sample preparation, the EFFU cup maintains consistent flow rates and membrane integrity for samples with viscosity up to 15 cP and protein content below 5 mg/mL.

Can the same EFFU cup be used for both membrane transfer and in-cup liquid culture?

Yes—the design permits dual-mode operation: post-filtration, the membrane may be aseptically transferred to solid media, or sterile liquid enrichment broth may be introduced directly into the cup, converting it into a sealed incubation vessel.

What is the maximum recommended filtration volume for accurate CFU recovery?

For optimal recovery (>70% per USP ), the recommended maximum volume is 100 mL for the 100 mL cup and 250 mL for the 250 mL cup, assuming nominal turbidity and absence of particulate interference.

Does Millipore provide lot-specific certificates of analysis (CoA) for EFFU cups?

Yes—each sterile pack includes a CoA listing EO sterilization parameters, endotoxin levels (<0.25 EU/mL), and membrane pore size verification per ASTM F838-22.

How should used EFFU cups be disposed of after microbial testing?

Used cups must be autoclaved at 121°C for ≥15 minutes prior to disposal as biohazardous waste, in accordance with local biosafety level 2 (BSL-2) containment protocols and ISO 15190:2020 laboratory safety standards.