Low-Retention Pipette Tips for Protein and Enzyme Workflows

By Donal O’Sullivan, BSc. Reviewed by Michael Anderson, MBA.

 

Handling proteins and enzymes can make small liquid losses more important, particularly when samples are limited, reagents are expensive or transfer volumes are low. Low-retention pipette tips can help reduce liquid left behind on the internal tip surface, but low retention is not the same as low protein binding.

For protein and enzyme workflows, the right question is therefore not simply whether a tip is labelled “low retention”. Laboratories should consider what is causing sample loss, what performance the manufacturer actually supports, and whether the candidate tip performs acceptably with the real workflow.

Key Takeaways

• Low-retention pipette tips are designed to reduce liquid remaining on the internal tip surface after dispensing. They can be worth evaluating when residual liquid is significant relative to the transfer volume or sample value.
• Low retention and low protein binding describe different performance characteristics. A low-retention claim does not by itself demonstrate reduced adsorption of proteins, peptides or enzymes.
• Protein and enzyme behaviour can vary with the biomolecule, concentration, formulation, additives and handling conditions. A tip that performs well in one workflow should not automatically be assumed suitable for another.
• Check the complete tip specification, including pipette fit, working volume, contamination-control requirements and any relevant manufacturer evidence. Do not select on a low-retention label alone.
• Where recovery is important, a practical comparison using the laboratory's actual or representative workflow can provide stronger evidence than relying only on a general product claim.

Why Can Pipette Tip Choice Matter for Proteins and Enzymes?

Every liquid transfer leaves some potential for material to remain behind. Part of this may be liquid retained on the internal surface of the pipette tip. With proteins and enzymes, there can also be interactions between the biomolecule and surfaces it contacts.

Liquid retention is influenced not only by the presence of a protein or enzyme but also by the physical properties of the complete formulation. Components such as detergents can reduce surface tension and promote wetting of conventional polypropylene tip surfaces, while viscosity can also affect liquid-handling performance. The benefit of a low-retention tip should therefore be assessed against the complete formulation rather than inferred simply from the presence of a biomolecule.

These are related practical concerns, but they are not the same phenomenon.

For routine transfers where the amount left behind is insignificant relative to the working volume and the requirements of the method, conventional tips may perform perfectly well. The case for evaluating a specialist tip becomes stronger when small losses could matter — for example, when handling limited samples, valuable reagents or low transfer volumes.

The consequences also depend on the workflow. Losing a small amount of an inexpensive bulk reagent is different from losing the same proportion of a scarce protein preparation or enzyme solution.

That is why tip selection should begin with the application rather than the product label.

Low Retention and Low Protein Binding Are Not the Same Thing

This is the most important distinction when selecting pipette tips for protein and enzyme work.

Low-retention performance concerns the tendency of a liquid to wet and remain on the internal tip surface during liquid handling. Low-retention tips are designed to reduce this wetting and the resulting residual liquid, which can improve liquid delivery where retention on the tip surface is a significant source of transfer loss.

Protein binding or adsorption concerns interactions between biomolecules and the material or surface they contact.

A product described as low retention should therefore not automatically be interpreted as a low-protein-binding tip.

The distinction matters because an apparently cleaner dispense does not establish how much of a particular protein or enzyme may have interacted with the surface. Protein adsorption can depend on factors including the particular biomolecule, its concentration, formulation and the conditions under which it is handled.

If protein adsorption is a material concern in your workflow, look for evidence relevant to that characteristic rather than assuming that a general low-retention claim covers it.

For a broader explanation of when low-retention tips are useful across laboratory applications, see when laboratories should use low-retention pipette tips.

When Are Low-Retention Tips Worth Evaluating?

There is no useful rule that says every protein or enzyme workflow requires low-retention tips.

Instead, consider whether residual liquid is likely to be material to the work being performed.

Low-retention tips may warrant evaluation where:

• residual liquid represents a meaningful proportion of the volume being handled;
• the formulation contains components, such as detergents, that promote wetting of conventional tip surfaces;
• proteins, enzymes or other reagents are expensive, limited or difficult to replace;
• visible or measured liquid retention is occurring with the current tips;
• repeated transfers make small individual losses operationally significant;
• consistency of transferred material is important to a controlled laboratory workflow.

The decision should still be proportional. If the existing tip performs acceptably and residual liquid is not materially affecting the workflow, changing consumables simply because a low-retention version exists may add cost or complexity without a demonstrated benefit.

Start by Identifying the Problem You Are Trying to Solve

Before changing tips, define the concern.

Is liquid visibly remaining in the tip after dispensing?

Is recovery lower than expected?

Is the concern specifically adsorption of a protein or enzyme?

Are results varying between transfers?

Or is the laboratory trying to reduce the amount of an expensive reagent left behind during routine handling?

These questions lead to different investigations.

For example, visible liquid remaining on the tip wall may justify evaluating low-retention performance. Suspected protein adsorption requires evidence relevant to protein binding or a suitable recovery assessment. Inconsistent transfer results could also have causes unrelated to surface retention, including pipetting technique, pipette condition, tip fit or the physical properties of the liquid.

Avoid using a specialist consumable as a substitute for identifying the underlying problem.

What Should You Check When Choosing a Tip?

A low-retention claim is only one part of the specification.

1. Evidence for the Performance You Need

Check what the manufacturer actually claims and, where available, how that performance has been assessed.

If your concern is residual liquid, evidence relating to low-retention performance is relevant.

If your concern is protein or enzyme adsorption, look specifically for evidence relevant to biomolecule binding or recovery. Do not infer this from terminology such as “low retention” alone.

Be cautious when comparing claims from different manufacturers. Similar terminology does not necessarily mean that products have been evaluated using identical test methods or conditions.

2. Pipette Fit and Functional Compatibility

A specialist surface does not compensate for poor pipette-tip fit.

The tip must form an appropriate seal with the pipette and function correctly across the intended working range. Poor fit can introduce its own liquid-handling problems and undermine the reason for selecting a specialist tip in the first place.

Where compatibility is important, use manufacturer information or appropriate laboratory evaluation rather than assuming that physical attachment alone establishes acceptable performance.

3. Working Volume

Select a tip and pipette appropriate to the volume being transferred.

At low transfer volumes, even small absolute losses can represent a meaningful proportion of the intended delivery. However, the extent of liquid retained in a tip also depends on the properties of the liquid and its interaction with the tip surface, so volume alone does not predict the benefit of a low-retention tip.

The pipette, tip, liquid and working volume should therefore be considered as a system rather than selecting the tip characteristic in isolation.

4. Contamination-Control Requirements

Low-retention performance does not automatically tell you whether a tip is sterile, filtered or suitable for a particular contamination-control requirement.

Determine those requirements separately.

A workflow may need a low-retention tip and an aerosol barrier, for example, but the need for one does not establish the need for the other. Similarly, sterility or specified purity characteristics should be confirmed from the relevant product documentation rather than inferred from the low-retention designation.

5. Workflow-Specific Requirements

Consider the actual protein or enzyme preparation being handled.

Relevant factors may include:

• transfer volume;
• biomolecule and concentration;
• formulation and additives;
• number and frequency of transfers;
• value or availability of the sample or reagent;
• consequences of unacceptable recovery;
• downstream sensitivity to the transfer process.

This prevents the purchasing decision becoming a generic specification exercise detached from the laboratory method.

A Practical Selection Framework

A useful way to approach the decision is to match the observed concern to the characteristic that needs investigation.

The important point is that the problem determines the specification. “Low retention” should not become a catch-all description for every performance requirement associated with protein and enzyme handling.

Should You Test Low-Retention Tips Before Standardising Them?

Where the consequences of changing consumables are material, a controlled comparison is sensible.

The aim does not have to be an elaborate validation exercise. The level of evaluation should reflect the importance and risk of the workflow.

A practical assessment could compare the existing tip with a candidate low-retention tip using the actual workflow or a suitably representative system.

Define What You Are Comparing

Keep the comparison focused on the performance that matters.

Depending on the application, that might include:

• consistency of delivered volume;
• observable residual liquid;
• gravimetric or other appropriate assessment of liquid delivery, where volume-transfer performance is the concern;
• an appropriate protein-, enzyme- or activity-based recovery measurement, where biomolecule recovery is the concern;
• repeatability across representative transfers;
• practical pipette fit and handling.

For enzymes, define recovery according to the purpose of the workflow. Measuring recovered protein concentration does not necessarily establish preservation of enzyme activity, because loss of activity can occur without an equivalent loss of measurable protein. Where functional enzyme recovery is important, an appropriate activity measurement may therefore be more informative than protein concentration alone.

Do not interpret one observation as proof of an unrelated characteristic. For example, reduced visible liquid does not by itself demonstrate reduced protein adsorption.

Use Representative Conditions

Where practical, test under conditions that resemble routine use.

A result obtained with a different liquid, concentration or volume may not represent the actual protein or enzyme workflow. This is particularly important where biomolecule behaviour rather than simply liquid wetting is the concern.

Compare Like with Like

Avoid changing several variables simultaneously.

If the laboratory changes pipette, tip, technique and sample preparation at the same time, it becomes difficult to determine what caused any difference observed.

A controlled comparison should isolate the consumable change as far as reasonably practical.

Use the same pipetting procedure for each tip being compared, including aspiration and dispense settings or technique, pre-wetting where applicable, immersion depth, aspiration and dispense speed, and any blow-out or touch-off step. These factors can affect delivered volume and residual liquid independently of the tip surface.

Record the Decision

For repeat workflows, document why the selected tip was accepted.

The record need not be complicated. Depending on the laboratory's requirements, useful information could include:

• pipette and tip identification;
• relevant tip specification;
• working volume;
• representative sample or reagent conditions;
• what was compared;
• observed result;
• final purchasing specification.

This turns the decision into a repeatable purchasing requirement rather than relying on individual preference.

Common Selection Mistakes

Assuming “Low Retention” Means “Low Protein Binding”

It does not. Treat the two characteristics separately and look for evidence relevant to the actual concern.

Choosing on Surface Technology Alone

Different products may use different approaches to achieving their claimed performance. The practical question is whether the finished tip meets the requirements of your workflow, not whether a particular technology sounds more advanced.

Ignoring Tip Fit

Surface performance cannot compensate for an unsuitable pipette-tip interface. Fit and functional compatibility remain fundamental.

Assuming Every Protein Workflow Needs a Specialist Tip

Some workflows may gain little practical benefit from changing. Evaluate the significance of the problem before adding a specialist consumable to the purchasing specification.

Treating Sterility, Filtration and Low Retention as a Package

These are separate characteristics. Specify each only when required by the application and verify it for the product being considered.

Standardising Before Checking the Workflow

Standardisation can simplify purchasing and repeat ordering, but only after technical suitability has been established. A single specification should not be imposed across workflows with materially different requirements simply for procurement convenience.

From Technical Evaluation to Repeat Purchasing

For a growing biotech laboratory, the commercial benefit of a consumable specification comes from being able to repeat a technically sound decision.

Once a low-retention tip has been shown to meet the requirements of a protein or enzyme workflow, recording the specification can make subsequent purchasing more straightforward. Scientists do not need to reconsider the entire selection each time, and purchasing teams have a clearer basis for reordering.

That does not mean the laboratory must standardise every workflow on the same tip. Different pipettes, transfer volumes, contamination controls or biomolecule-handling requirements may justify different specifications.

The objective is controlled standardisation where the evidence supports it.

When you are ready to compare suitable options, browse low-retention pipette tips and check the complete specification against your application requirements.

Frequently Asked Questions

Are low-retention pipette tips the same as low-protein-binding tips?

No. Low-retention performance concerns reducing liquid remaining on the tip surface after dispensing, while low-protein-binding performance concerns interactions between proteins and the surface. A low-retention claim alone does not demonstrate reduced protein adsorption, so check evidence relevant to the characteristic your workflow requires.

Do all protein and enzyme workflows need low-retention pipette tips?

No. Low-retention tips are worth evaluating when residual liquid could materially affect the transfer or when the formulation promotes wetting of conventional tip surfaces. Factors such as sample or reagent value, transfer conditions and the properties of the complete formulation should inform the decision. If conventional tips already provide acceptable performance, changing to a specialist tip may offer no meaningful workflow benefit.

Can low-retention tips improve protein recovery?

Low-retention tips can reduce liquid retained on the tip surface, but this does not establish improved protein recovery in every workflow. Protein recovery can also be affected by adsorption and other workflow factors. Where recovery matters, use relevant product evidence or compare candidate tips under representative conditions rather than assuming that low-retention performance also demonstrates low protein binding.

Should low-retention tips be tested before routine use?

Low-retention tips should be evaluated under representative conditions where changing the consumable could materially affect the workflow. A proportionate comparison can determine whether a candidate tip provides a useful benefit while meeting requirements for fit, liquid delivery and any relevant protein-, enzyme- or activity-based recovery measure. Keep the pipetting procedure consistent between tips so that technique does not confound the comparison.

Are low-retention tips automatically sterile or filtered?

No. Low retention, sterility and filtration are separate product characteristics. If a workflow requires sterile tips, aerosol barriers or particular purity specifications, verify those requirements independently for the exact product being considered.

Read More

• When Should Laboratories Use Low-Retention Pipette Tips?
• The Complete Guide to Pipette Tips, Pipetting Accuracy & Laboratory Liquid Handling

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• Browse low-retention pipette tips

 

Written by: Donal O’Sullivan, BSc, Co-Founder and Sales Director, LabFriend UK. Donal brings deep chemistry-led technical expertise across analytical chemistry, biochemistry, environmental monitoring, laboratory instrumentation, consumables and scientific product selection.

Reviewed by: Michael Anderson, MBA, Founder and Managing Director, LabFriend UK. Michael reviews LabFriend UK content for customer relevance, commercial accuracy, operational practicality and alignment with LabFriend UK’s laboratory supply model.