Difference Between PVDF Filter Membrane and Nitrocellulose Membrane
Filter membrane is used for the separation and concentration of solutes in the treatment solution and is also commonly used for the separation of colloidal suspensions. It can be made of different materials with different properties. Today, HAWACH will talk about the difference between PVDF and nitrocellulose filter membranes.
Difference Between PVDF Filter Membrane and Nitrocellulose Membrane
1. Material & Structure
PVDF Filter Membrane:
* A hydrophobic fluoropolymer.
* Chemically resistant, mechanically strong, and durable.
* Requires pre-wetting with methanol or ethanol before use (for blotting).
Nitrocellulose Filter Membrane:
* Made from nitrocellulose.
* Naturally hydrophilic.
* Lower mechanical strength and more fragile than PVDF.
2. Protein Binding Capacity
PVDF Filter Membrane:
* Very high protein-binding capacity (~170–200 µg/cm²).
* Suitable for detecting low-abundance proteins.
* Strong hydrophobic interactions → protein binding is highly stable.
Nitrocellulose Filter Membrane:
* Moderate protein-binding capacity (~80–100 µg/cm²).
* Provides sharp, clean bands with lower background.
* Good for standard proteins, but may lose very hydrophobic proteins.
3. Chemical & Physical Stability
PVDF Filter Membrane:
* Highly resistant to solvents, acids, bases, and heat.
* Can tolerate stripping and reprobing multiple times.
* Tough and tear-resistant.
Nitrocellulose Filter Membrane:
* Sensitive to many organic solvents.
* Limited resistance to repeated stripping.
* Easier to tear and more fragile during handling.
4. Signal & Background Characteristics
PVDF Filter Membrane:
* High signal intensity.
* Slightly higher background if not blocked properly.
* Suitable for chemiluminescent, fluorescent, and colorimetric detection.
Nitrocellulose Filter Membrane:
* Lower background noise.
* Produces very sharp bands.
* Ideal for chemiluminescent or colorimetric detection.
5. Typical Laboratory Applications
PVDF Filter Membrane:
* Western blotting for low-abundance proteins
* When reprobing, the membrane is required
* Hydrophobic protein detection (e.g., membrane proteins)
* Samples with harsh chemicals or detergents
Nitrocellulose Filter Membrane:
* Routine Western blots
* High-clarity band visualization
* Applications needing a low background
* Protein dot/slot blots
6. Filtration-Specific Differences (If using as filter membranes)
PVDF Filter Membrane:
* Hydrophobic: suitable for filtering organic solvents, alcohols, and aggressive chemicals.
* Hydrophilic PVDF versions are available for aqueous solutions.
* Low protein binding → ideal for sample preparation where analyte recovery matters (HPLC sample filtration).
Nitrocellulose Filter Membrane:
* Strong protein binding → not ideal for protein-containing samples unless retention is desired.
* Mainly used for binding proteins in analytical methods, not for general filtration.
PVDF membrane
PVDF is the abbreviation of Polyvinylidene Fluoride, which is made by coating the surface of PVC film with PVDF resin. Its performance is better than pure PVC membrane material, and the price is correspondingly slightly higher than pure PVC membrane material. Compared with ordinary PVC membranes, PVDF membranes have improved durability of about 7~10 years.
Compared with the nitrocellulose membrane, the PVDF filter has superior performance in protein retention, mechanical strength, and chemical compatibility. The typical binding capacity of commercially available nitrocellulose membrane is 80-100μg/cm2, while the binding capacity of PVDF membrane is 100-200μg/cm2 (and the binding strength of PVDF is 6 times stronger than nitrocellulose membrane).
But the advantages of PVDF membrane are not only here: better mechanical strength and chemical resistance make PVDF membrane an ideal choice for various staining applications and multiple immunoassays, and the lane copy of a single gel can be used for multiple purposes. In particular, N-terminal protein sequencing is required. Under very “rigorous” cleaning conditions, PVDF membranes still maintain their original colors when nylon or nitrocellulose membranes have degraded. So, PVDF membrane is the best choice for protein sequencing. But it is not suitable for fluorescence.
The special attention to PVDF membrane is that it needs to be pretreated with 100% methanol (no more than 15 seconds) and then equilibrated with buffer solution before it can be used, and if it dries during the application process, it must be processed in the same procedure.
PVDF membrane is also divided into 0.45 μm and 0.2 μm. The latter has a small pore size and has better interception and adsorption of small molecule proteins, and the background may be slightly higher than the former.
Nitrocellulose membrane
Nitrocellulose membrane is a widely used transfer medium for Western blotting. It has a strong binding ability to proteins and is suitable for various color development methods, including isotope, chemiluminescence (Luminol), conventional color development, dyeing, and fluorescent color development, with low background and high signal-to-noise ratio.
The use of the NC membrane is also very simple. For example, no formaldehyde pretreatment is required. Just soak the air bubbles on the non-ionized water surface and equilibrate in the electrophoresis buffer for a few minutes. For example, the NC membrane is easy to seal, and no special cleaning conditions are required.
The protein transferred to the NC membrane can be stored stably for a long time under suitable conditions, but it should be noted that the pure nitrocellulose membrane is relatively fragile and easy to roll. Be careful in handling, and not suitable for repeated cleaning.
When choosing a nitrocellulose membrane, the operator should pay attention to choosing a suitable pore size. Generally, a 0.45 μm pore size membrane is used for macromolecular proteins above 20 kDa. If it is less than 20KD, it is recommended to choose 0.2um. If it is less than 7KD, it is better to choose a 0.1um membrane. In addition, pay attention to choosing pure NC; the binding force of the NC membrane mixed with cellulose acetate (CM) will be reduced.
In addition, since the protein bound to the NC membrane will be replaced by some detergents, it is better to use a milder one when sealing, and the concentration should not exceed 0.3% (it is said that 0.05% is effective).
Generally speaking, the purer the NC membrane, the higher its protein binding capacity, so increasing the sensitivity and resolution of WB and improving the purity of the membrane used is a choice that can be considered. If the NC membrane is mixed with some acetylated cellulose, which has been mentioned earlier, it will affect protein binding.
Summary
PVDF: Strong, chemically resistant, high protein-binding capacity, reusable, great for low-abundance or hydrophobic proteins, suitable for harsh conditions.
Nitrocellulose: Clean background, easy to use, good for routine Western blots, but fragile and not ideal for reprobing or harsh conditions.
If you want, I can provide a side-by-side comparison table, a short version for lab reports, or a sentence-level version for methods sections.
