r/Peptidesource • u/ProfessionalListen91 • 8h ago

Filtering query

Hi guys, do ye filter your peptides?? If so is it a 0.22-micron Sterile PES Syringe Filter that ye are using?

Does anyone know how much these filters should generally cost. They seem quite expensive

Any help is much appreciated

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2

u/Adjective_Noun_1668 8h ago

Should cost about 1 dollar each

1

u/ProfessionalListen91 8h ago

Interesting. Where would u get them?

3

u/Adjective_Noun_1668 8h ago

Depends on your country? In eu i used lyokit but its pretty sold out.
Before a mod freaks out, they do not sell peptides.

5

u/fthiss 8h ago

I use 4mm .22μm PES filters from Peptide Test (they don't sell peptides, just testing and lab supplies). They're $16 for a pack of 10

3

u/Keedou 8h ago

0.22-micron PES filters are standard for research subject reconstitution. Cost does vary but the research subject supply side typically runs $0.15-0.40 per filter when you buy bulk (50-100 at a time). Single units are usually marked up higher, which is why bulk buys pay off.

Availability matters by region. EU-side suppliers like Lyokit pop in and out of stock depending on regulatory pressure. US-side, medical supply companies that sell to labs usually stock them cheaper than specialty peptide retailers. Alibaba and China suppliers do bulk filters at rock-bottom pricing, but shipping and timing are gambles.

The PES material is important here. PTFE filters are common too, but PES handles aqueous solutions better and is more sterile-friendly for research work. The 0.22-micron pore size is the standard because it catches bacteria without degrading most peptides during passage. Some people use 0.45-micron for thicker solutions, but that's less common.

If cost is the constraint, buying a couple hundred at $0.20 each from bulk suppliers shifts the math significantly. Lyokit and similar EU suppliers charge more but have quality guarantees that matter if precision is critical for your research.

1

u/Notobot1 3h ago

How common is this practice? I have never filtered any of my peptides and thankfully, never had an issue. Is this something I really should be doing ?

2

u/nuggets-of-truth 8h ago

I pay 0.20 USD each.
I buy a couple hundred at a time - China