Written by Harry Wolf,
A laboratory result… It can reflect the biological system under investigation. And its interaction with the materials used to study it.
A sample container, culture surface, or reagent-contact component, for instance, should therefore be treated as part of the experimental system – not simply as a purchasing decision.
The central question? It is whether a material performs consistently under the conditions required by the method.
Things like chemical compatibility, analyte recovery, cleanliness, mechanical properties, and resistance to processing… They all deserve consideration – before a material becomes part of a routine workflow.
Effective selection connects those properties to measurable acceptance criteria. By documenting why a material was chosen and how its suitability was verified, laboratories can better distinguish biological variation from avoidable procedural variation.
In turn, they can strengthen the reproducibility of their findings.
Selecting Materials
Material selection should begin with the intended use. Rather than a preference for a particular polymer, glass formulation, or supplier, that is.
A material suitable for storing a concentrated reagent may require separate evaluation before use with a low-concentration clinical research specimen.
The assessment should identify every stage at which the sample contacts another surface. Collection devices, transfer tips, storage vessels, seals, and analytical containers… They all belong within the same review – even when different teams purchase or use them.
An acceptance specification should describe the conditions under which performance matters, such as:
- Sample matrix and concentration range
- Contact duration, temperature, and mixing procedure
- Cleaning or sterilization requirements
- Acceptable effects on the measured outcome
Laboratories should define what constitutes an unacceptable effect before testing begins. Depending on the method, the relevant endpoint might be:
- Reduced analyte recovery
- Increased background signal
- Altered cell behavior
- Greater variability between replicates
Selection then becomes a testable decision – rather than a general judgment about material quality, that is.
The strongest justification is evidence that a specified product performs adequately within a defined workflow, supported by records that allow another researcher to reproduce the choice.
Chemical Compatibility and Purity Requirements
Chemical compatibility and analytical suitability… They should be assessed separately. A container can remain visibly intact while still producing an unacceptable result in a particular assay – so an inspection alone is simply not an adequate acceptance test.
A practical evaluation? It should reproduce the intended exposure conditions, including the solvent composition and contact duration. Where relevant, the comparison should include the concentration range at which the laboratory needs reliable measurements.
Before requesting supplier documentation, define the questions that the material must satisfy. Researchers should know about the:
- Compatibility with the intended sample matrix and reagents
- Acceptable background under the planned analytical method
- Consistent performance after the required processing steps
Supplier discussions should connect those requirements to the experimental workflow.
For instance, when evaluating laboratory science equipment, researchers can access technical support from MSE Supplies’ team of PhD scientists and engineers. The company supports projects from research through to production.
Purity claims should be interpreted according to their stated scope. Laboratories should request the relevant specification, test method, and acceptance threshold – rather than assuming that a broad product description establishes suitability for every application, that is.
The resulting documentation should distinguish supplier-provided evidence from locally generated evidence. Keeping those records separate makes it easier to identify:
- What has been established
- Which additional checks are necessary before routine use
Surface Interactions and Analyte Recovery
Container surfaces… They require particular attention when recovery is central to the analytical result. The appropriate comparison is not simply glass versus plastic – but the performance of a defined product with the sample and method of interest.
According to research published by the National Library of Medicine, peptide adsorption differed across tested polypropylene and glass vial types.
For laboratories measuring peptides, those findings support evaluating container-related recovery directly – rather than relying on a general material category or low-binding designation.
Two questions can guide the evaluation. Researchers should know whether:
- The material preserves acceptable recovery under the intended conditions
- The controls can distinguish handling effects from biological differences
Evaluating Recovery Under Relevant Conditions
A recovery study should compare the proposed material with a justified reference condition. Testing should include concentrations near the range where a loss would affect interpretation – rather than only concentrations that are convenient to measure.
Contact duration and sample handling should remain controlled during the comparison. The assessment should cover the complete sample-contact sequence.
Why? Well, a satisfactory storage vessel doesn’t establish that earlier collection or transfer steps are equally suitable.
Separating Recovery From Biological Interpretation
An unexpected decrease in measured concentration? It should prompt an examination of the handling pathway before it is assigned a biological explanation.
Matched controls can help assess whether the observation follows the sample, the container, or another procedural difference.
Any mitigation should then be verified against the method’s intended use. A change that improves recovery is useful only if it preserves the other characteristics required for a valid result!
Culture Substrates as Experimental Variables
Materials used in cell-based research should be specified as experimental inputs. Describing a vessel only by its dimensions or nominal capacity leaves important features of the culture environment insufficiently defined.
A study published by the National Library of Medicine examined how hydrogel thickness and stiffness influenced human bone marrow stromal cell behavior.
For researchers interpreting cell-based endpoints, the study illustrates why substrate geometry and mechanical properties may need to be controlled – alongside medium composition and culture duration.
A laboratory evaluating a new culture substrate should identify the outcomes necessary to establish comparability. Depending on the research question, the assessment may include:
- Cell attachment and morphology
- Growth and viability
- A relevant functional response
The comparison should use matched biological inputs – and a consistent observation schedule. Acceptance criteria should be established before reviewing the results, thus reducing the risk of accepting a material merely because one favorable endpoint appears unchanged.
Records should identify the surface treatment, coating procedure, product reference, and lot where available. Also, details of coating preparation and storage should be retained when they form part of the method.
A replacement culture vessel should therefore be treated as a controlled change. Matching its general material description is a starting point for evaluation – not sufficient evidence that the biological system will behave equivalently.
Contamination Control Beyond Sterility
Contamination requirements should be defined by the measurement rather than reduced to a single cleanliness label. A laboratory needs to establish which unwanted substances or biological signals could compromise its particular experiment.
Guidelines for preventing and reporting contamination in low-biomass microbiome studies, published in Nature, address contamination from reagents, consumables, and laboratory handling in low-biomass microbiome studies.
For laboratories examining samples with limited microbial material, the practical implication is to evaluate background contamination alongside the sample signal and report the controls used.
Material qualification should distinguish the requirements relevant to the experiment, such as:
- Sterility
- Nucleic acid background
- Endotoxin specifications
- Chemical cleanliness
A contamination-control plan should identify where controls enter the workflow. Collection controls, extraction blanks, and other negative controls should be selected according to the steps that need assessment – rather than added without a defined interpretive purpose.
When a control produces an unexpected signal, the investigation should compare plausible sources systematically.
Records of reagent lots, consumable lots, preparation dates, and handling conditions can support that comparison – without presuming that a single component is responsible.
The final method? It should explain both the controls performed and the criteria used to interpret them. After all, a statement that materials were “clean” is less informative than a documented requirement linked to an appropriate verification procedure.
Thermal Stability and Processing Requirements
Material suitability should be assessed after the processing steps required by the workflow. Evaluation of an unused item alone does not establish its acceptability after cleaning, sterilization, heating, or repeated temperature changes.
The qualification plan should specify the actual processing conditions – rather than rely on a general statement such as “heat-resistant.” The assessment should address two complementary questions. Researchers should know whether:
- The processing conditions are within the product’s documented specifications
- The processed item still meets the method’s acceptance criteria
Relevant records may include:
- Exposure temperature
- Duration
- Cycle count
- Cleaning agents
- The sequence in which treatments occur
For reusable items, laboratories should define the permitted reuse conditions and the evidence needed to support them.
An inspection can assess visible damage, while functional testing should address the performance characteristics that matter to the method.
Any proposed departure from a single-use product’s intended use should trigger a documented evaluation- rather than becoming routine through informal practice.
Post-processing checks should be selected according to the component’s role. A closure may require an assessment of sealing performance, while a measurement vessel may require confirmation that its relevant dimensions or analytical performance remain acceptable.
Laboratories should establish rejection criteria before processing begins. Clear criteria help prevent inconsistent decisions about whether an item remains suitable – and, in turn, make the handling procedure easier to reproduce across operators and study periods.
Qualification and Change Control for Reproducibility
A material becomes useful for reproducible research when its identity and acceptance criteria can be traced through the experiment. Purchasing records alone rarely describe enough of the decision to support a later investigation or replication attempt.
A qualification record should connect the product to its intended application and the evidence supporting its use. At a minimum, it should capture:
- Product identity and relevant specifications
- Qualification conditions and acceptance criteria
- Test results and unresolved limitations
- Approval decisions and reassessment requirements
Comparative testing should use conditions that reflect the planned work. Replicates, controls, and predefined acceptance limits should be sufficient to distinguish a meaningful material effect from ordinary variation within the method.
Once approved, the material should be identified consistently in operating procedures and study records.
The required reassessment should depend on the plausible effect – that is, rather than a rule that every replacement needs either no testing or complete revalidation.
Periodic review should compare qualification assumptions with actual laboratory use.
Strengthening Reproducibility With Material Choices
Material selection in healthcare research laboratories is most defensible when each choice is connected to a defined experimental requirement. Compatibility assessments, recovery testing, contamination controls, and processing checks should form a coherent record.
A focused review? It can begin with two actions:
- Identifying a critical sample-contact pathway
- Checking whether each material has documented acceptance criteria
The goal is not to identify a universally superior material. It is to establish that a specified product performs consistently within a particular method – and that relevant changes receive appropriate review.
Hopefully this article has been informative! If that is the case, take a moment to explore some of our other insightful posts.
References
- Siebels, B., Moritz, M., Hübler, D., Gocke, A., Riedner, M., Voß, H., & Schlüter, H., 2024, Assay for Characterizing Adsorption‐Properties of Surfaces, National Library of Medicine.
https://pmc.ncbi.nlm.nih.gov/articles/PMC11618038/
- Hernandez-Miranda, M. L., Xu, D., Ben Issa, A. A., Johnston, D. A., Browne, M., Cook, R. B., Sengers, B. G., & Evans, N. D., 2024, Geometric constraint of mechanosensing by modification of hydrogel thickness prevents stiffness-induced differentiation in bone marrow stromal cells, National Library of Medicine.
https://pmc.ncbi.nlm.nih.gov/articles/PMC11444768/
- Fierer, N., Leung, P. M., Lappan, R., Eisenhofer, R., Ricci, F., Holland, S. I., Dragone, N., Blackall, L. L., Dong, X., Dorador, C., Ferrari, B. C., Goordial, J., Holmes, S. P., Inagaki, F., Korem, T., Li, S. S., Makhalanyane, T. P., Metcalf, J. L., Nagarajan, N., . . . Greening, C., 2025, Guidelines for preventing and reporting contamination in low-biomass microbiome studies, Nature.
https://www.nature.com/articles/s41564-025-02035-2
- Unauthored, 2024, Autoclave: Sterilize Equipment and Materials, UC San Diego.
https://blink.ucsd.edu/safety/research-lab/biosafety/autoclave/sterilization.html
- Unauthored, 2025, Guidance Document on Good In Vitro Method Practices (GIVIMP), Second Edition, OECD.
- Szymański, Ł., undated, The Role of Material Selection in Successful Biocompatibility Outcomes, European Biomedical Institute.
https://ebi.bio/the-role-of-material-selection-in-successful-biocompatibility-outcomes/
Author Bio
Harry Wolf is a freelance writer. For almost a decade, he has written on topics ranging from healthcare to business leadership for multiple high-profile websites and online magazines.
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