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Phosphoinositides and PIPs

Phosphoinositides and PIPs

Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...

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Updated: Jan 8, 2026

Absolute Quantitation of Inositol Pyrophosphates by Capillary Electrophoresis Electrospray Ionization Mass Spectrometry

Absolute Quantitation of Inositol Pyrophosphates by Capillary Electrophoresis Electrospray Ionization Mass Spectrometry

Published on: August 13, 2021

Analytical methods and tools for studying inositol phosphates.

Masatoshi Ito^1,2, Shinichi Koguchi³, Adolfo Saiardi⁴

¹Department of Neurology, Tokai University School of Medicine, Isehara, Japan.

|December 16, 2025

Summary

This summary is machine-generated.

Detecting inositol phosphates (InsPs) in biological samples is challenging. Recent analytical chemistry advancements, including mass spectrometry and chromatography, improve InsP detection and quantification for biological research.

Keywords:

capillary electrophoresis–mass spectrometry inositol phosphate inositol pyrophosphate isotope labeling liquid chromatography–mass spectrometry mass spectrometry phosphoramidite chemistry

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Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry

Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry

Published on: July 26, 2019

Area of Science:

Biochemistry
Analytical Chemistry
Molecular Biology

Background:

Inositol phosphates (InsPs) play crucial biological roles, but their full significance is not yet understood.
Detecting InsPs in complex biological samples is a major hurdle in InsP research.

Purpose of the Study:

To review the historical and recent methodologies for inositol phosphate research.
To highlight advancements in analytical techniques and synthetic chemistry for InsP studies.

Main Methods:

Review of analytical chemistry techniques: NMR spectroscopy, mass spectrometry (MS), liquid chromatography (LC), and capillary electrophoresis (CE).
Discussion of synthetic chemistry approaches for creating InsPs and their analogs.
Focus on MS coupled with LC and CE for sensitive InsP detection.

Main Results:

Analytical chemistry advancements enable sensitive and selective differentiation of InsPs.
Synthetic methods provide tools for absolute abundance quantification and functional studies.
Recent protocols combine LC-MS and CE-MS for improved InsP analysis.

Conclusions:

Analytical chemistry expertise is increasingly vital for inositol phosphate research.
New methods enhance the ability to study InsP biological and medical significance.
Integrated approaches using advanced analytics and synthesis are key for future InsP discoveries.