PES vs Nylon vs PVDF Syringe Filters — Which to Use for Peptide Solutions

Published 2026-08-07 · Lab Supply Finder Editorial

You’re reconstituting 5 mg of a lyophilized peptide, and the last thing you need is your sample vanishing onto a filter membrane. Peptide solutions are unforgiving — they stick to plastics, bind to certain polymers, and get denatured by others. Your choice of syringe filter membrane is not a trivial consumable decision; it is a yield decision.

For most peptide work, PVDF (polyvinylidene fluoride) is the default winner, with nylon as a close second for non-specific binding tolerance, and PES (polyethersulfone) best reserved for high-flow, low-binding aqueous runs where you are not worried about hydrophobic peptides. Here is the breakdown, scored on published manufacturer specifications.

Which syringe filter membrane has the lowest protein binding for peptides?

PVDF membranes exhibit the lowest non-specific protein binding of the three common filter materials, typically adsorbing less than 1% of protein in solution per the manufacturer's published spec. Nylon binds noticeably more — often 10-100x higher depending on the solute — while PES sits in between, with moderate binding that worsens for hydrophobic peptides. For a 1 mg/mL peptide stock, PVDF is the safest yield-preserving choice.

The binding differences come down to surface chemistry. PVDF is a fluoropolymer — inherently hydrophobic but readily wetted with a low concentration of organic solvent or surfactant. Nylon is a polyamide with active amide groups that hydrogen-bond to peptides, especially those with exposed aromatic residues. PES is a sulfone polymer with a slightly negative surface charge that can electrostatically attract positively charged peptide regions.

Per the manufacturer datasheets from Pall, Sartorius, and Merck Millipore, PVDF is the only one of the three that is routinely specified as "low protein binding" across all pore sizes. Nylon is rarely given that designation. If you are filtering a hydrophobic peptide like a membrane-active antimicrobial peptide, PVDF is non-negotiable — nylon will eat a measurable fraction of your yield.

How much sample volume do you lose to hold-up volume in a syringe filter?

Hold-up volume is the liquid that stays trapped in the filter housing after you finish pushing — and it is a dead loss of your sample. For a 13 mm diameter filter, hold-up volume is typically 10-15 µL; for a 25 mm filter, it jumps to 100-200 µL per the manufacturer's published spec. That means a 25 mm filter can waste 10-20% of a 1 mL peptide solution.

This is the overlooked cost of syringe filtration. You can buy the lowest-binding membrane on the market, but if you use a 25 mm housing for a 500 µL sample, you are throwing away 20-40% of your peptide to dead volume. The fix is simple: use 13 mm or 4 mm filters for volumes under 2 mL. A 4 mm PVDF filter with 0.2 µm pores holds back only 3-5 µL — negligible for most applications.

The tradeoff is flow rate. Smaller filters clog faster, especially with serum-containing or particulate-laden samples. For a clean peptide solution — which is what you have after dissolving lyophilized powder in water or buffer — a 13 mm filter is almost always sufficient.

PES vs Nylon vs PVDF: What is the flow rate difference?

PES has the highest flow rate of the three membranes, typically 2-3x faster than PVDF and 3-5x faster than nylon at the same pore size and pressure per the manufacturer's published spec. This is because PES is a naturally hydrophilic, asymmetric membrane with a more open pore structure. For filtering 10 mL or more of aqueous buffer, PES is the speed winner.

But flow rate is a double-edged sword. The open PES structure that gives you speed also gives you less retention of small particulates — and more surface area for binding. PES is also the most prone to extractables, particularly if the membrane is not properly pre-washed by the manufacturer. For peptide work where you are filtering a small volume once, flow rate rarely matters. For a high-throughput lab processing dozens of samples, PES can save meaningful time.

Nylon is the slowest of the three, largely because it is a symmetric, depth-type membrane that traps particles throughout its thickness rather than just on the surface. That depth filtration is excellent for clarity — you get a visually cleaner filtrate — but it also means more contact time between your peptide and the membrane, increasing binding risk.

What about extractables — which membrane leaches the most into your sample?

Extractables are the non-membrane compounds — wetting agents, surfactants, plasticizers, and manufacturing residuals — that leach into your filtrate. According to published manufacturer specifications, nylon and PES generally have higher extractables than PVDF, particularly when first wetted. PVDF is the cleanest of the three, with the lowest levels of leachable organic compounds.

This matters most for downstream analysis. If you are filtering a peptide solution before HPLC or mass spec, extractables can show up as ghost peaks in your chromatogram or as background ions in your mass spectrum. Nylon filters are notorious for releasing caprolactam, a monomer that shows up as a distinct peak in reverse-phase HPLC. PES can release sulfone-related breakdown products.

PVDF is the safest choice for analytical work. It is also the most chemically compatible with the organic solvents commonly used in peptide purification — acetonitrile, methanol, DMSO. Nylon is incompatible with DMSO and some strong acids. PES is incompatible with strong bases and some organic solvents. If you are filtering a peptide dissolved in 50% acetonitrile, PVDF is the only reliable choice of the three.

Syringe Filter Membrane Comparison for Peptide Solutions (Based on Published Manufacturer Specifications)

| Parameter | PES | Nylon | PVDF | |---|---|---|---| | Protein Binding | Moderate (hydrophobic peptides worse) | High (amide groups bind) | Low (<1% per spec) | | Flow Rate | Fastest (2-3x PVDF) | Slowest | Moderate | | Extractables | Moderate | High (caprolactam) | Lowest | | Solvent Compatibility | Good (not for strong bases) | Poor (no DMSO) | Excellent (DMSO, ACN, MeOH) | | Hold-up Volume (13 mm) | ~10-15 µL | ~10-15 µL | ~10-15 µL | | Best Use | High-volume aqueous buffer filtration | General lab filtration, not peptides | Peptide solutions, analytical prep | | Score (1-5 for peptide work) | 3 | 2 | 5 |

How much does a syringe filter cost per unit?

Pricing varies by vendor and volume, but published catalog prices show a clear hierarchy: PES is the cheapest at roughly $0.50-1.00 per 13 mm unit, nylon sits in the middle at $0.75-1.50, and PVDF is the premium option at $1.50-3.00 per 13 mm unit in single-pack quantities. Bulk pricing (100+ units) typically cuts these costs by 30-50%.

For a lab filtering a few dozen peptide samples per week, the cost difference between PES and PVDF is negligible — perhaps $20-30 per month. The yield difference from binding, however, can be worth hundreds of dollars in peptide material. A 5 mg vial of a custom peptide can cost $50-200 depending on length and purity. Losing 5-10% of it to a nylon filter is a false economy.

The real cost comparison is between vendors, not membranes. Check the published price lists from Thermo Fisher, MilliporeSigma, and Pall — and compare against the house brands from Lab Supply Finder's listed suppliers. The membrane is the same; the markup is not.

Which syringe filter should you buy for a 50-vial month?

For a lab processing 50 or more peptide vials per month, the 13 mm PVDF filter with 0.2 µm pores is the clear winner — it costs roughly $1.50-2.50 per unit in bulk, saves 5-15% yield versus nylon, and eliminates extractable-related analytical headaches. Buy a 100-pack from a reputable vendor and the per-unit cost drops toward $1.00.

A 50-vial month means roughly 50-100 filtration events. At $1.00-1.50 per filter, that is $50-150 per month in consumables. The yield protection from PVDF pays for itself if you lose even one 5 mg vial of peptide to binding.

For a one-time 5-vial test, buy a 10-pack of 13 mm PVDF filters and be done with it — the $15-20 cost is immaterial compared to the cost of the peptide you are filtering.

What about prefilters and serial filtration?

If your peptide solution is turbid or contains aggregates, do not push it through a 0.2 µm filter directly — you will clog it and lose sample to pressure-driven binding. Use a 0.45 µm prefilter first, or buy a dual-layer filter that combines a glass fiber prefilter with a PVDF membrane. This is standard practice for peptide solutions that have been frozen and thawed, which often form visible aggregates.

A 0.45 µm PVDF prefilter followed by a 0.2 µm PVDF final filter adds a few dollars per sample but prevents the frustration of a clogged filter mid-push. For sterile filtration of peptide solutions intended for cell culture, use a 0.22 µm PVDF filter — the 0.2 µm and 0.22 µm pore sizes are functionally equivalent for bacterial retention, but 0.22 µm is the standard spec for sterility per USP <71>.

The bottom line on syringe filter membranes

PVDF is the default for peptide work. It is not the cheapest, not the fastest, and not the most universally compatible — but it is the only one of the three that combines low binding, low extractables, and broad solvent compatibility. Nylon is a reasonable choice for non-peptide aqueous filtration where cost is the primary driver. PES is a high-flow option for buffer filtration where binding is not a concern.

For a pragmatic shopper, the decision rule is simple: if you are filtering a peptide, buy PVDF. If you are filtering anything else aqueous, buy PES and save the money. Nylon only wins when you need the depth filtration for clarity and do not care about binding or extractables — which is almost never in peptide work.

| Vendor | Membrane Options | Published Specs Available | Approx. Price per 13 mm Unit (100-pack) | Score (1-5) | |---|---|---|---|---| | Thermo Fisher (Nalgene) | PVDF, PES, Nylon | Yes — full datasheets | $0.90-1.80 | 4 | | MilliporeSigma | PVDF, PES, Nylon | Yes — full datasheets | $1.20-2.50 | 4 | | Pall (Acrodisc) | PVDF, PES, Nylon | Yes — full datasheets | $1.00-2.00 | 4 | | Lab Supply Finder house brand | PVDF, PES | Yes — basic specs | $0.60-1.20 | 3 |

Prices are approximate published catalog values; check current vendor listings for exact quotes. All comparisons are based on published manufacturer specifications, not independent testing.