A microtiter plate assay for inorganic phosphate

Area of Science:

• Biochemistry
• Analytical Chemistry

Background:

• Inorganic phosphate (Pi) is crucial in numerous biochemical processes.
• Accurate quantification of Pi is essential for understanding enzyme kinetics and metabolic pathways.
• Existing assays may lack the sensitivity or speed required for certain applications.

Purpose of the Study:

• To develop and validate a highly sensitive microtiter assay for picomolar quantities of inorganic phosphate.
• To assess the assay's linearity, speed, and correlation with conventional methods.
• To demonstrate its utility in enzyme assays involving Pi generation.

Main Methods:

• Development of a microtiter plate-based assay for inorganic phosphate detection.
• Determination of assay linearity range (50–1000 pmol Pi).
• Comparison of results with conventional phosphate assays using 5'-nucleotidase and (Ca2+ + Mg2+)ATPase assays.

Main Results:

• The assay reliably detects inorganic phosphate in the picomolar range.
• Assay linearity was established between 50 and 1000 pmol of inorganic phosphate.
• High correlation was observed between the novel assay and conventional methods in enzyme studies.
• The assay provides results within minutes, requiring a small sample volume.

Conclusions:

• A simple, rapid, and highly sensitive microtiter assay for picomolar inorganic phosphate has been established.
• The assay demonstrates excellent performance and high correlation with existing methods.
• Its sensitivity and minimal sample requirement make it suitable for broad biochemical applications involving Pi quantification.