Technical Support

Confirm the target is expressed in the sample and that the antibody is suitable for the application and species. Review storage history, dilution, incubation, transfer or antigen retrieval where relevant, and detection reagents. Run a known-positive control and change one variable at a time.

Practical note: Record the antibody lot, sample preparation and acquisition settings so changes can be compared.

Review primary and secondary concentrations, blocking conditions, wash stringency, sample preparation and detection settings. Verify that the secondary antibody matches the primary host and include suitable negative controls.

Practical note: Optimise one source of background at a time rather than changing the whole protocol.

Important: Do not treat a band or fluorescent signal as specific without suitable controls.

Use the datasheet recommendation as a starting range, then titrate around it using the same sample, exposure and detection conditions. Choose the lowest concentration that gives the required specific signal with acceptable background.

Practical note: A concentration that works for one application or sample preparation may not transfer directly to another.

Confirm the host species and isotype of the primary antibody, the reactivity and conjugate of the secondary antibody, and whether endogenous immunoglobulins or multiplexing could create cross-reactivity. Use single-stain or secondary-only controls where appropriate.

Practical note: For multiplex work, check spectral overlap and cross-adsorption as well as host compatibility.

Run the new and previous lot side by side where possible using the same samples, controls and acquisition settings. Compare specific signal, background and any application-specific performance criteria before changing the routine workflow.

Practical note: Keep representative raw data and note both lot numbers.

Follow the product datasheet for buffer and concentration. Add buffer gently, allow the material to dissolve, then mix without unnecessary foaming or vigorous vortexing. Prepare practical single-use aliquots and avoid repeated freeze-thaw cycles.

Practical note: Some proteins require carrier protein, reducing agent or specific pH conditions for stability.

Review storage temperature, concentration, buffer composition, freeze-thaw history and handling. Compare a fresh aliquot and use an appropriate positive-control assay where possible.

Practical note: Aggregation can be concentration, buffer and temperature dependent.

Start with the product-specific formulation and the requirements of the downstream assay. Consider pH, ionic strength, reducing conditions, carrier proteins and additives that may interfere with the intended application.

Practical note: Do not exchange buffers solely for convenience if the protein is known to be formulation-sensitive.

Use a method appropriate to the protein and formulation, such as absorbance with a suitable extinction coefficient or a calibrated protein assay. Account for carrier proteins or excipients that can interfere with total-protein methods.

Practical note: The best method depends on purity, formulation and the accuracy required by the experiment.

Include a vehicle or negative control, a relevant positive control where available, and a concentration range that can reveal dose-dependent behaviour. Confirm that the assay can distinguish loss of protein activity from assay failure.

Practical note: Match the control strategy to the biological mechanism and readout.

Check template quality and quantity, primer design, reaction setup, polymerase requirements and cycling conditions. Confirm that the target is present and include a positive control that separates a reaction failure from a target-specific problem.

Practical note: Review annealing temperature and amplicon design before increasing cycle number indiscriminately.

Early amplification with a product-like melt peak may indicate contamination. Late amplification with a different melt profile may suggest primer-dimer formation. Replace suspect reagents and keep pre-amplification work physically separate from amplified products.

Practical note: Use melt curves or product analysis to distinguish likely contamination from non-specific products.

Check template integrity and purity, reverse-transcription consistency, pipetting, primer specificity and reaction efficiency. Run appropriate standards and negative controls. Replicate variability commonly increases close to the assay's lower quantification range.

Practical note: A standard curve can help identify efficiency and dynamic-range problems.

Review primer design, amplicon length, template quality, inhibitor carryover and the concentration range used for the standard curve. Confirm that the dilution series is accurate and spans a range where the assay remains linear.

Practical note: Interpret efficiency together with linearity and melt-curve specificity rather than as a standalone number.

Prepare standards with calibrated pipettes, mix each dilution thoroughly and run replicates. Follow the curve model recommended for the assay, subtract blanks as instructed and avoid relying on readings outside the useful range of the plate reader.

Practical note: Use the ABMIUM ELISA Data Analyser to review replicates, CV values and curve fit.

Do not extrapolate beyond the stated assay range. Dilute samples above the range and repeat them, then apply the dilution factor. Samples below the lower range should be handled according to the kit's stated detection or quantification limits.

Practical note: Plan dilutions from pilot data when very high or low concentrations are expected.

Review pipetting, plate washing, timing, plate sealing, sample mixing and edge effects. Look for a pattern across the plate rather than assuming every high CV has the same cause.

Practical note: Repeat the affected samples when the assay acceptance criteria are not met.

Check incubation times, wash performance, reagent preparation, sample dilution and whether the signal is approaching detector saturation. Verify that stop solution and reading wavelength match the kit instructions.

Practical note: High standards and samples can both reveal insufficient washing or overdevelopment.

Review passage number, viability, seeding density, medium formulation, supplement quality and incubator conditions. Confirm cell identity and investigate mycoplasma where appropriate.

Practical note: Compare against a recent healthy reference culture if available.

Review confluence, coating requirements, medium, dissociation conditions, handling stress and incubator parameters. Sudden widespread detachment can also indicate contamination or a reagent problem.

Practical note: Document when detachment begins relative to media changes, treatment or passaging.

Document the change and review confluence, medium, serum or supplement lot, passage number and handling. Quarantine suspect cultures and investigate contamination or identity if the change persists.

Practical note: Compare morphology with growth rate and viability rather than interpreting appearance alone.

Important: Do not rely on morphology alone to confirm identity or contamination.

Review pre-freeze viability, cell density, cryoprotectant preparation, cooling rate, storage conditions and thawing procedure. Assess viability and recovery over an appropriate period after thaw rather than immediately after handling alone.

Practical note: Use consistent passage and recovery criteria when comparing freezing conditions.

Check the product-specific shipping and stability statement before use. Photograph the parcel, record the arrival condition and contact support with the catalogue number, lot number and delivery date. Retain the packaging until the case is reviewed.

Practical note: Do not assume that a temperature excursion has the same consequence for every reagent class.

Provide catalogue and lot numbers, order reference, storage history, protocol, sample type, controls, instrument settings and representative raw data or images. Include both the expected and observed result.

Practical note: Side-by-side data with a previous lot or control material is especially useful when available.

Photograph the external package and affected items, retain all packaging and contact support with the order reference, catalogue number and lot number. Do not discard temperature-control materials or damaged components until the case has been reviewed.

Practical note: Report shipping damage promptly so courier and supplier records can be checked.

No. Some buffers, proteins and concentrated reagents can precipitate under particular storage or temperature conditions. Check the product instructions before warming, mixing, centrifuging or redissolving the material.

Practical note: Record storage temperature and appearance before manipulating the sample.

Important: Do not apply a generic redissolution method to an unknown formulation.

The stated shelf life and expiry information should be followed unless the manufacturer provides product-specific extension data or a documented requalification route. Contact support if the material is critical and replacement timing is a concern.

Practical note: Do not generalise stability from one lot or reagent class to another.