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Detecting Levels of Polyquaternium-10 (PQ-10) via Potentiometric Titration With Dextran Sulphate and Monitoring the Equivalence Point With a Polymeric Membrane-Based Polyion Sensor

Detecting Levels of Polyquaternium-10 (PQ-10) via Potentiometric Titration With Dextran Sulphate and Monitoring the Equivalence Point With a Polymeric Membrane-Based Polyion Sensor

Stephen A Ferguson, Xuewei Wang, Mark E Meyerhoff

Anal Methods. 2016 Aug 7;8(29):5806-5811.

PMID: 28018490

Abstract:

Polymeric quaternary ammonium salts (polyquaterniums) have found increasing use in industrial and cosmetic applications in recent years. More specifically, polyquaternium-10 (PQ-10) is routinely used in cosmetic applications as a conditioner in personal care product formulations. Herein, we demonstrate the use of potentiometric polyion-sensitive polymeric membrane-based electrodes to quantify PQ-10 levels. Mixtures containing both PQ-10 and sodium lauryl sulfate (SLS) are used as model samples to illustrate this new method. SLS is often present in cosmetic samples that contain PQ-10 (e.g., shampoos, etc.) and this surfactant species interferes with the polyion sensor detection chemistry. However, it is shown here that SLS can be readily separated from the PQ-10/SLS mixture by use of an anion-exchange resin and that the PQ-10 can then be titrated with dextran sulphate (DS). This titration is monitored by potentiometric polyanion sensors to provide equivalence points that are directly proportional to PQ-10 concentrations.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP927691212	PQ-10		927691-21-2	Price

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