Contamination control is often discussed as a matter of laboratory technique.
Researchers may review pipetting procedures, clean work areas, separate workflows, and improve sample handling. However, contamination prevention also begins before an experiment starts—with the selection, purchasing, storage, and replenishment of laboratory consumables.
A product that does not match the intended application can increase the risk of experimental failure, additional testing, sample loss, and schedule delays. It may also result in emergency purchasing requests and unexpected costs.
For procurement teams, the goal is not simply to purchase more sterile products. It is to understand the requirements of each workflow and select consumables with the appropriate specifications, packaging, and quality information.
In this article, we introduce five points procurement teams should consider when supporting laboratory contamination control.
1. Consider the Wider Impact of Contamination
Contamination can affect much more than a single experimental result.
When contamination is suspected or confirmed, laboratory teams may need to repeat experiments, discard samples and reagents, investigate the cause, clean equipment, and review working procedures.
This can lead to:
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Repeated experiments
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Loss of valuable samples
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Additional use of reagents and consumables
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Delays to research schedules
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Time spent investigating the source
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Emergency purchasing and replacement orders
For procurement teams, this means that consumable selection is not only a cost-management decision.
Choosing products that match the requirements of the experiment can help reduce avoidable interruptions and support more consistent laboratory operations.
2. Do Not Treat “Sterile” as a Complete Specification
A sterile product is not automatically suitable for every contamination-sensitive application.
Sterility is only one of several specifications that may need to be considered. Depending on the intended use, laboratory personnel may also require information related to RNase, DNase, pyrogens, endotoxins, or other potential contaminants.
Before selecting a product, procurement teams should confirm:
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How the product will be used
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Whether aseptic handling is required
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Whether RNase- or DNase-related specifications are important
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Whether endotoxin control is required
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Which quality information is available from the manufacturer
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Whether the product meets the laboratory’s internal requirements
These terms should not be treated as interchangeable.
A product may be sterile while still requiring separate confirmation for a specific molecular biology, cell culture, diagnostic, or other sensitive application.
The most reliable approach is to confirm the required specifications with the laboratory team before purchasing or approving an alternative product.
3. Identify When Filter Tips Are Needed
During pipetting, liquid or aerosols may enter the pipette shaft and potentially become a source of contamination during later operations.
Filter tips provide a physical barrier between the sample and the pipette. They may be useful for workflows in which contamination could have a significant effect, including certain nucleic acid handling procedures and other sensitive applications.
However, this does not mean that every laboratory operation requires a filter tip.
Before changing products or standardizing all workflows around filtered tips, procurement teams should confirm:
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Which procedures require filter tips
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Where standard tips are acceptable
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The required volume range
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Compatibility with the laboratory’s pipettes
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Whether sterile products are needed
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Expected consumption and budget impact
Using filter tips only where they are required can help laboratories maintain an appropriate level of contamination control without creating unnecessary purchasing costs.
Procurement teams should support this process by recording which tip type is approved for each workflow.
4. Review Packaging, Not Only Product Specifications
The way a consumable is packaged can affect how it is handled after delivery.
Pipette tips and other consumables may be supplied in bags, racks, individual packages, or refill formats. Each option may offer different benefits depending on the laboratory environment.
When comparing packaging formats, procurement teams should consider:
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Whether the product will be stored for a long time after opening
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How many people will handle the same package
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Whether it will be used inside a clean bench or controlled area
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Whether manual refilling will be required
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Whether supplies can be separated by laboratory or workstation
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How opened products will be protected during storage
Bagged products may offer a lower purchasing cost or reduce packaging waste, but they can require additional handling and refilling.
Racked products may be easier to use immediately and can reduce the number of handling steps before pipetting begins.
Neither format is automatically the best choice for every laboratory. The appropriate option depends on the workflow, storage environment, usage rate, and contamination-control requirements.
5. Include Storage and Inventory Rotation in the Purchasing Plan
Even an appropriately selected product may not support contamination control if it is stored or handled poorly after delivery.
Procurement and laboratory teams should agree on how unopened and opened products will be identified, stored, and replenished.
Important points may include:
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Separating opened and unopened products
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Recording the date a package was opened
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Keeping products in a clean and suitable storage location
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Avoiding excessive inventory and long storage periods
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Using older inventory before newly delivered stock
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Checking for damaged packaging
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Preventing unnecessary movement between work areas
Inventory management is often discussed in terms of preventing stockouts. However, for contamination-sensitive products, the condition and age of the inventory can be just as important as the quantity available.
Maintaining an appropriate stock level helps ensure that products are available when needed without remaining in storage longer than necessary.
6. Standardize and Share Product Information
Contamination-control requirements should not remain only in the knowledge of individual researchers.
Procurement lists and internal product records should include the specifications required to identify the correct consumable.
Useful information may include:
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Product name
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Manufacturer and product number
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Volume or size
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Sterile or non-sterile status
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Filtered or non-filtered type
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Packaging format
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Pipette compatibility
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Relevant quality specifications
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Intended workflow or department
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Whether an alternative product is acceptable
This information can help prevent incorrect orders and reduce the risk of replacing an approved product with an alternative that does not meet the same requirements.
It is especially useful when several products have similar names, volumes, or appearances.
Standardized information also supports smoother purchasing when responsibilities are transferred to another team member.
Contamination Control Begins Before the Experiment
Contamination prevention is not limited to researcher technique or laboratory cleaning procedures.
Selecting consumables with the appropriate quality, specifications, and packaging—and ensuring they are stored and replenished correctly—also plays an important role.
Procurement teams do not need to make technical decisions independently. The most effective approach is to confirm requirements with laboratory personnel and maintain clear product information that both teams can use.
This cooperation can help laboratories avoid unnecessary costs and excessive precautions while selecting products that are appropriate for each workflow.
WATSON offers a variety of laboratory consumables, including standard and filtered pipette tips for different research applications.
By reviewing factors such as volume, sterility, filter type, packaging format, and pipette compatibility, procurement teams can identify products that better match the needs of each laboratory workflow.