repeated4275 said:
From my understanding, which is basically worth nothing, no you can't.
Lou-oogle says you can filter out particulates - personally I'd slap a .22 micron filter on that kit, plug and play... I figure I'm already overly cautious compared to others so like a little jolt of risk now and again.
PVDF (polyvinylidene fluoride) impurities in peptides typically refer to microscopic residues or fragments of PVDF membranes (often branded as Durapore) that shed into the sample during peptide purification, blotting, or filtration. While PVDF is commonly used for its low-protein-binding properties, it can contaminate sensitive applications like mass spectrometry (MS) or cell-based assays. [
1,
2,
3,
4,
5]
Can you filter PVDF impurities with a 0.22 \(\mu \)m filter? [
1]
Yes, a 0.22 \(\mu \)m (0.22 micron) filter is the standard method for removing particulate PVDF contamination. [
1]
Mechanism: A 0.22 \(\mu \)m syringe filter is ideal for removing particles, aggregates, and bacteria, allowing the dissolved peptide to pass through while trapping solid debris.
Recommended Filter Material: For peptides, a 0.22 \(\mu \)m PES (Polyethersulfone) filter is generally preferred over PVDF filters to avoid introducing more PVDF material.
Limitation: While it removes solid particles, it will not remove soluble chemical contaminants. [
1,
2,
3,
4,
5]
Key Considerations
PES is Often Better: Polyethersulfone (PES) filters are widely considered the "gold standard" for peptide filtration due to their low-binding properties and high flow rates.
Avoid Clogging: If the solution is highly contaminated, the filter may clog, requiring a larger pore size (e.g., 0.45 \(\mu \)m) as a pre-filter.
What it does NOT do: A 0.22 \(\mu \)m filter does not remove endotoxins (pyrogens) or soluble chemical impurities.
Alternative Cleanup: If particulates are dense, centrifugation at 10,000 RPM for 10 minutes is an effective alternative to remove solid particles. [
1,
2,
3,
4,
5]
For final sterilization or removal of fine particles, use a 0.22 \(\mu \)m low-protein binding filter (such as PES or PVDF) to ensure a clean, sterile, and high-quality peptide solution. [
1,
2,
3,
4,
5]
thanks!
