Today, our attention will be paid to its membrane filter. It is a polynuclear membrane composed of tens of thousands of micropores, which is used to filter various solutions, remove bacteria and impurities. The membrane filtration principle is simple: particles larger than the pore size are filtered on the surface. Its pore sizes range from 0.1um to 10.0um.
Nylon Membrane Filter
It is hydrophilic, with a high protein binding capacity. Compatible with aqueous and alcoholic solutions and solvents; suitable for HPLC
PTFE Membrane Filter
There are two kinds of PTFE membrane filters–PTFE hydrophobic and PTFE hydrophilic.
The PTFE filter membrane is made of PTFE which is completely made of natural permanent hydrophobicity. Even under a low-pressure difference, it can ensure that the humid air or other gases are unobstructed, while the aqueous solution is not permeable. Its performance is just the opposite of that of a hydrophilic membrane. The PTFE membrane is highly chemically compatible and is suitable for the filtration of all organic solvents and highly corrosive chemicals. When the aqueous phase solution must be filtered with a PTFE filter, it must be pre-impregnated with ethanol or isopropanol before the aqueous phase solution can be filtered.
Hydrophobic– resistant to organic solvents and strong acids; low protein binding capacity. It is for the filtration of anhydrous samples; corrosive solutions such as acid and alkali; HPLC sample preparation and movement-like sample clarification.
PVDF Membrane Filter
PES vs PVDF. It has wide chemical compatibility, excellent mechanical properties, strong resistance ( inferior to PTFE), fast flow rate, and low protein binding.
PVDF filter membrane has excellent heat resistance and chemical stability. It is not corroded by acid, alkali, strong oxidizing agent, and halogen at room temperature, and is stable to organic solvents such as aliphatic hydrocarbons, aromatic hydrocarbons, alcohols, and aldehydes. Hydrophilic PVDF has a low amount of protein adsorption and is widely used in sterilization and filtration in biopharmaceuticals. Positively charged PVDF can be used to remove endotoxin.
PES Membrane Filter
It is inherently hydrophilic, with good chemical compatibility and superior thermostability. It is for the sterilization and filtration of enzymes and proteins, the extraction and tissue culture of biological blood samples; filtration and sterilization of biological and clinical analytical agents.
CA Membrane Filter
It is hydrophilic, with very low protein binding capacity, and high physical strength. It can be used in protein and enzyme filtration; protein recovery; diagnosing cell material and clinical analysis, and tissue and culture medium sterilization.
MCE Membrane Filter
It is naturally hydrophilic, a mixture of nitrocellulose and cellulose acetate. It has a higher protein binding ability than CA; it can not be used for extracting protein; high porosity makes it flow faster; suitable for base water samples.
MCE Gridded Membrane Filter 3.1 micron; sterile, does not inhibit bacterial growth; color contrast is obvious–black and white (usually white lines on the black and black lines on white); white lines on the black for mold technology.
Glass fiber filter membrane (GF) is used to improve filtration rate and continuous filtration; glass fiber membrane is a deep filtration, and its main purpose is to use as a pre-filtration layer, directly on the filter membrane.