pNPP Phosphatase Assay Kit

Overview

For quantitative determination of phosphatase enzyme activity. The assay uses OD405nm for signal readout. Compatible sample input includes Protein phosphatases. Typical stated assay timing is 30 min.

Key elements and design rationale

• Readout format: OD405nm supports plate-based signal acquisition and consistent comparison across matched samples.
• Sample compatibility: The stated sample scope includes Protein phosphatases, which is useful when aligning matrix type with calibration and control design.
• Analytical range context: The supplied specifications include a stated detection limit of 3 ng for interpreting low-signal samples.
• Feature emphasis: High sensitivity and wide linear range. The detection limit is generally 3 ng phosphatase or below.

Additional feature notes highlight Homogeneous and simple procedure. No wash or reagent transfer steps are involved. The assay can be completed within 30 minutes; Robust and amenable to HTS. All reagents are compatible with high-throughput liquid handling instruments. Available format information for this listing includes 500 Tests.

Biological background

This product is centered on measurement of pnpp phosphatase within the matrices described for the assay. In practice, datasets from this type of format are typically interpreted by comparing relative signal, activity, or abundance across matched control and experimental groups rather than relying on a single value in isolation. Careful alignment of sample matrix, incubation window, and calibration strategy is important when comparing results across plates, operators, or study days.

More details

p-nitrophenyl phosphate (pNPP) is a chromogenic substrate for most phosphatases such as alkaline phosphatases, acid phosphatases, protein tyrosine phosphatases and serine/threonine phosphatases. The reaction yields para-nitrophenol, which becomes an intense yellow soluble product under alkaline conditions and can be conveniently measured at 405 nm on a spectrophotometer. This homogeneous “mix-and-measure” assay involves simply adding a single reagent to the phosphatase and measuring the product formation on an absorbance reader. The assay can be conveniently performed in cuvettes, tubes or multi-well plates at either room temperature or 37°

Detection method

Colorimetric (OD 405 nm).

Detection limit and analytical sensitivity

Reported detection limit: 3 ng.

Procedures and timing

Stated procedure or timing information: 30 min.

Research relevance and current trends

• Plate-based quantification and side-by-side group comparison remain central use cases for this assay format.
• The product notes emphasize multi-sample throughput, making it relevant for screening-oriented and larger batch comparison studies.
• Short assay timing and plate compatibility support time-course or repeated-measure collection plans when handling is kept consistent.

Common research applications

• Quantify pnpp phosphatase in protein phosphatases by OD405 nm readout.
• Compare treatment or phenotype groups using matched protein phosphatases handling.
• Monitor time-course or pre/post changes in protein phosphatases across study conditions.

Interpretation is usually strongest when signal changes are assessed alongside matrix-matched controls, replicate agreement, and the assay's stated analytical window.

Notes for experimental interpretation

• Matrix composition, background signal, and sample handling can influence apparent response; compare like-with-like whenever possible.
• Use appropriate blanks, controls, and replicate wells to distinguish biological differences from plate, reagent, or handling variability.

For laboratories requiring additional technical capacity, we provide scientific support services including assay execution, method guidance, product sourcing, and customization to align the assay with specific experimental objectives. If you need assistance selecting the appropriate kit configuration, adapting the workflow to your application, or identifying related research services, please click Talk to a Scientist, email support@biohippo.com, or review our Research Services; a member of our scientific team will follow up with recommendations tailored to your study.