Mitochondrial Complex I Activity Colorimetric Assay Kit

What it means: A Colorimetric assay generates a coloured product whose absorbance is proportional to the amount of analyte or enzyme activity in the well.

Why it matters:

• A Colorimetric readout runs on any standard absorbance plate reader, so no fluorescence module or specialised optics are required.
• Coloured endpoints are stable enough to read a full plate in one pass, which simplifies batching and scheduling.
• Absorbance formats tolerate coloured or turbid lysates less well than fluorescence, so heavily pigmented samples may need clarification or blanking.

How to interpret here: This kit is supplied in the Colorimetric format, so plan for an absorbance reader at the stated wavelength and include a reagent blank on every plate.

Tip: Run the standard curve on the same plate as your samples; absorbance drift between plates is the most common source of run-to-run variation.

What it means: The kit is read at 600 nm, the absorbance wavelength at which the coloured product is measured.

Why it matters:

• Any standard absorbance plate reader that covers 600 nm is suitable; no fluorescence capability is needed.
• Reading at a nearby but incorrect wavelength lowers sensitivity and flattens the standard curve.
• Coloured or turbid samples can contribute absorbance of their own, so a sample blank is worth including alongside the reagent blank.
• Plate material also matters: optically clear plates give cleaner absorbance readings than tissue-culture-treated ones.

How to interpret here: Set the filter or monochromator to 600 nm and read the standards and samples in the same pass so that lamp drift affects both equally.

Tip: If your reader offers a reference wavelength, using it corrects for plate scratches, fingerprints and condensation artefacts.

What it means: The validated working range of this kit is 0.1 mU/well (linear up to 7 mU/well).

Why it matters:

• A range of 0.1 mU/well (linear up to 7 mU/well) defines where the standard curve is linear and results are quantitative.
• Samples above the range must be diluted; samples below it should be concentrated or run with more input.
• Reading outside the range gives numbers that look valid but are not proportional to the true concentration, which is why out-of-range wells must be re-run rather than reported.
• The stated range applies under datasheet conditions, so changing sample volume or matrix will move the practical limits in your hands.

How to interpret here: Dilute or concentrate samples so that readings fall inside 0.1 mU/well (linear up to 7 mU/well), and re-run any well that falls outside it rather than extrapolating from the curve.

Tip: Include the standard curve on every plate; a curve carried over from a previous plate is the most common reason results drift out of range unnoticed.

What it means: The kit is stored at -20°C as a complete unit.

Why it matters:

• A single -20°C storage condition means the kit can be filed intact with no need to separate components on arrival.
• A standard laboratory freezer is sufficient; no ultra-low freezer is required.
• Repeated freeze-thaw cycles still degrade enzyme and substrate components, so aliquoting is worthwhile for frequent use.
• A frost-free freezer cycles above the set point during defrost, which is harder on labile components than a manual-defrost unit.

How to interpret here: File the whole kit at -20°C on arrival and return components promptly after each use rather than leaving them at the bench between plates.

Tip: Aliquot the substrate and any enzyme component on first thaw if you expect to use the kit over many sessions, and store the aliquots in a manual-defrost freezer where possible.