Two 8-strip tubes can look identical and behave differently, because the difference sits on the inside of the tube. A standard strip is moulded from plain polypropylene; a low-binding strip has its inner surface modified so that proteins, nucleic acids and enzymes have far less to stick to.
That single change decides which one belongs in your protocol.
The difference is the inner surface
Untreated polypropylene binds biomolecules non-specifically. In a standard strip, a fraction of the protein, nucleic acid or enzyme in the reaction adsorbs to the wall instead of staying in solution. It is invisible, it scales with surface area, and it hurts most when there is very little material to begin with.
A low-binding strip is surface-modified to suppress that adsorption. The result is that nearly all of the reaction liquid takes part in the reaction rather than a fraction of it sitting on the wall after the spin.
What that changes in practice
| Standard 8-strip | Low-binding 8-strip | |
|---|---|---|
| Inner surface | Plain polypropylene, no treatment | Modified to suppress non-specific binding |
| Residue after emptying | Higher; noticeable loss when recovering trace amounts | Very low; nearly all the liquid can be recovered |
| Effect on the assay | Acceptable where some loss is tolerated | Less fluorescence signal loss; better sensitivity and reproducibility |
| Quality control | DNase-free, RNase-free, sterile | DNase-free, RNase-free, pyrogen-free, plus adsorption testing for batch consistency |
| Cost | Lower | Higher |
Which one belongs in your protocol
Standard strips are the right default for routine PCR and standard amplification, where the reaction contains enough material that a small adsorptive loss does not change the answer, and where cost per strip matters across a high volume of runs.
Low-binding strips earn their price where recovery is the measurement: qPCR, micro-volume protein assays, and recovery of low-abundance nucleic acids. The same property that improves recovery also reduces fluorescence signal loss, which is why sensitivity and reproducibility both improve rather than one at the expense of the other.
The extra quality control matters as much as the surface itself. Low-binding strips are tested for adsorption performance in addition to being DNase-free, RNase-free and pyrogen-free, so the behaviour is consistent from batch to batch — which is what makes a qPCR result comparable across months of work.
Available catalogue numbers
| Catalogue no. | Description |
|---|---|
| BS-PCR-01D | 0.1 mL clear PCR tube, single tube |
| BS-PCR-02D | 0.2 mL clear PCR tube, single tube |
| BS-PCR-081-C | 0.1 mL clear PCR 8-strip tube (including optical flat cap) |
| BS-PCR-081-M | 0.1 mL milky-white PCR 8-strip tube (with lid) |
| BS-PCR-082-C | 0.2 mL clear PCR 8-strip tube (including optical flat cap) |
| BS-PCR-082-M | 0.2 mL milky-white PCR 8-strip tube (with lid) |
| BS-PCR-0102-CM | 0.1 mL / 0.2 mL PCR 8-well strip cap, optical flat cap, clear |
| BS-PCR-02T-LG | 0.2 mL transparent PCR 8-strip tube with cap |
Frequently asked questions
Is low-binding worth it for standard PCR?
Usually not. If the reaction has enough template and the result is a band, adsorption loss does not change the outcome, and standard strips cost less.
Does low-binding change the plastic itself?
The base material is still polypropylene; what changes is the inner surface treatment, which is what suppresses non-specific binding.
Can I mix standard and low-binding strips in one run?
Mechanically yes, but do not compare the results as if the wells were equivalent. If you are measuring recovery or a low signal, keep one tube type across the whole comparison.
Related reading
Note: The information on the scientific research products above is for reference only!
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