Membrane Filters
DHI LAB Products is a supplier of GVS filters (former Poretics)
Cheap prices on filters, please see our pricelist
- Polycarbonate filters, especially suitable for e.g., capturing cells above the pore size of the filter, size fractionation of water samples, or identification and counting of cells by microscopy
- Black polycarbonate filters, especially suitable for e.g., epifluorescence microscopy
- Teflon PTFE syringe filters, especially suitable for filtration of organic samples for HPLC, gas,
strong acids and aggressive solutions
GVS, former Poretics, Polycarbonate Membrane Filters (PCTE)
- Smooth thin glass-like surface with cylindrical pores capturing 100% of cells larger than pore size
- Hydrophilic
- Ideal for particle identification by microscopy
- Precise pore sizes and pore distribution for absolute filtration and separation
- Negligible absorption and adsorption
GVS, former Poretics, Black Polycarbonate Membrane Filters (PCTE)
- Zero auto fluorescence, ideal for epifluorescence microscopy
- Hydrophilic
- Permit phytoplankton, bacteria, yeasts, etc to be visible
- Smooth surface plane for microscopy
The epifluorescence microscopy technique is used for the assay of microorganisms in water samples, food and dairy products, wines and beverages, and for general micro-biological laboratory, medical, and research purposes.
The basic procedure is simple and reproducible:
- A known quantity of liquid is filtered through a black polycarbonate membrane
- The microorganisms, e.g., bacteria, can be stained, while some organisms like algae show auto fluorescence
- The fluorescing microorganisms are observed using an epifluorescence microscope
| GVS, former Poretics (Polycarbonate PCTE) Membrane Filters |
| Diameters - mm |
13
25
47
|
| Colors |
White (standard)
Black (suitable for microscopy) |
| Pore sizes - µm |
0.2
0.4
0.6
0.8
1.0
2.0
3.0
4.0
5.0
8.0
10.0
20.0
|
Most polycarbonate (PCTE) filters are in stock
GVS, former Poretics, Teflon PTFE Syringe Filters
- Non-sterile and hydrophobic
- Especially suited for HPLC samples
- Negligible absorption and adsorption
| GVS, former GE Osmonics Teflon (PTFE) Syringe Filters |
| Diameters - mm |
17
30
|
| Pore sizes - µm |
0.20
0.45
|
Teflon (PTFE) syringe filters, 0.2 µm pore size and 17 mm diameter are in stock. These are especially suited for pre-filtering solvent extracts prior to HPLC analysis.