Flow Injection Sensing Strategy for Determining Cationic Surfactants in Commodity and Water Samples

• Published in: Chemosensors Vol. 10; no. 10; p. 434
• Main Authors: El Hamd, Mohamed A, El-Maghrabey, Mahmoud, Abdel-Lateef, Mohamed A, Ali, Samah M, Ibrahim, Munjed M, El-Shahat, Mohamed F, Azeem, Sami M. Abdel
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01-10-2022
• Subjects: Absorbance; Antiseptics; Automation; Catechol; Cetyltrimethylammonium bromide; cetyltrimethylammonium bromide (CTAB); Chemical properties; Commodities; Copper; copper-pyrocatechol violet complex (Cu-PCV); Detectors; Flow stability; flow-injection spectrophotometry; Identification and classification; Injection; Methods; personal care antiseptic products; Personal care industry; Sanitizers; Sensors; Skin care products; Software; Spectrophotometry; Surface active agents; Surfactants; Technology application; Toiletries; water sample; Water sampling; Egypt
• DOI: 10.3390/chemosensors10100434
• EISSN: 2227-9040

The formation of stable binary water-soluble sub-micellar aggregates of cetyltrimethylammonium bromide-copper-pyrocatechol violet complex (CTAB-Cu-PCV) diminishes the stability and absorbance of the Cu-PCV complex. A new flow injection spectrophotometric sensing strategy used for the determination of CTAB in commodity personal care antiseptics and water samples has been established relying on the above-mentioned concept. Based on the reduction of the absorption of the Cu-PCV solution by the injection of CTAB solution at pH 6.0 and 430 nm, a linear absorbance decrease was observed over the CTAB concentration range of 2.0 to 100.0 µg mL−1 (r = 0.987). The analysis method showed limits of detection (3.3 ơ) and quantification (10 ơ) of 0.08 and 0.27 µg mL−1, respectively. The precision (RSD) for five replicate determinations was 7.9 and 3.7% at 10 and 50 µg mL−1, respectively. The developed method was applied successfully to the determination of CTAB in personal care products, namely skin lotion and vaginal wash, in addition to water samples. The corresponding RSD (n = 5) values were ≤8.2%.