Laboratory microbial quality control
Membranes and ready-to-use filtration formats for microbial capture, bioburden testing and colony enumeration.
Method-aligned membrane, surface and workflow selection
Membrane formats
Microbiology membrane filtration captures microorganisms from a measured sample volume on a membrane that can be transferred to culture medium for incubation and enumeration. Membrane color and grid contrast support colony recognition, while sterile individual packaging or integrated filtration units can reduce handling steps and contamination risk.
Selection should follow the analytical method and consider sample matrix, organism recovery, membrane chemistry, pore size, diameter, color, grid, sterility, holder compatibility and incubation system. White membranes with dark grids are common for colored colonies; dark membranes with light grids can improve contrast for pale colonies.
A familiar colony-counting surface that provides visual reference lines and contrast for many colored colonies.
Best fit Routine enumeration
Surface and grid choices can be matched to colony color, counting method and the visual demands of the analytical workflow.
Best fit Method-specific contrast
An integrated sterile format can reduce membrane handling and simplify routine sample filtration before incubation.
Best fit Closed, repeatable workflow
Surface and workflow selection
The capture membrane is part of the complete analytical method. Chemistry and pore size influence filtration and recovery, while membrane color, grid design, handling format and sterility affect recognition, transfer and workflow control.
Laboratory applications
Membrane, medium, sample preparation and incubation conditions must be qualified together for the organisms and matrix covered by the method.
Microbial-enumeration testing in pharmaceutical and biotechnology laboratories using controlled membrane-filtration workflows.
Microbiological analysis of water, beverages, food ingredients and selected raw materials.
Routine environmental and process-water quality control using method-compatible membranes and culture conditions.
Colony counting after membrane filtration of measured aqueous sample volumes.
Method-specific capture and detection of bacteria, yeasts and molds using suitable membrane and nutrient media combinations.
Repeatable laboratory workflows using sterile membranes, dispenser-ready packs or integrated filtration units.
Quotation requirements
Provide the method, sample and equipment context so membrane recovery, visual contrast, packaging and holder compatibility can be reviewed as one configuration.
Identify the compendial or internal method, sample matrix, volume and target organisms.
Select MCE or PES, pore size, diameter, color, grid and any hydrophobic-edge requirement.
Confirm loose membrane, dispenser-ready pack or integrated filtration-unit format.
Specify holder, funnel, nutrient medium, incubation conditions and colony-counting approach.
Define sterility, individual packaging, recovery testing, certificates and lot documentation.
Verify membrane diameter, holder fit, grid behavior and the approved transfer and incubation workflow.
Configuration matrix
Available combinations are configuration-specific. Confirm recovery, method suitability and equipment fit for the selected membrane or unit.
| Product type | Format | Media | Pore size | Diameter | Surface / grid | Sterility |
|---|---|---|---|---|---|---|
| Microbiology Membrane | Disc membrane | MCE / PES | 0.22 / 0.45 µm | 47 / 50 mm | White membrane, black grid | Sterile / non-sterile |
| Microbiology Membrane | Disc membrane | Selected MCE / PES | 0.22 / 0.45 µm | 47 / 50 mm | Gridded or plain | Sterile / non-sterile |
| Microbiology Membrane | Disc membrane | Selected MCE / PES | 0.22 / 0.45 µm | 47 mm | Black membrane, white grid | Sterile / non-sterile |
| Microbiology Filtration Unit | Integrated membrane | MCE / PES by configuration | 0.22 / 0.45 µm | Integrated membrane | Gridded or plain by configuration | Sterile |
MCE means mixed cellulose ester and PES means polyethersulfone. Surface, grid, diameter, media and sterile supply are offered in approved combinations.
Confirm method, sample matrix, volume, target organisms, membrane media, pore size, diameter, color, grid, workflow format, holder, culture medium, incubation conditions, sterility, packaging and documentation before submitting the final RFQ for technical review.