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Potentiometric Surfactant Sensor Based on 1,3-Dihexadecyl-1H-benzo[d]imidazol-3-ium for Anionic Surfactants in Detergents and Household Care Products

Sakač, Nikola; Madunić-Čačić, Dubravka; Marković, Dean; Hok, Lucija; Vianello, Robert; Šarkanj, Bojan; Đurin, Bojan; Hajdek, Krunoslav; Smoljan, Božo; Milardović, Stjepan; Matasović, Brunislav; Jozanović, Marija (2021) Potentiometric Surfactant Sensor Based on 1,3-Dihexadecyl-1H-benzo[d]imidazol-3-ium for Anionic Surfactants in Detergents and Household Care Products. Molecules, 26 (12). pp. 1-14. ISSN 1420-3049

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A 1, 3-dihexadecyl-1H-benzo[d]imidazol-3-ium- tetraphenylborate (DHBI-TPB) ion-pair implemented in DHBI-TPB surfactant sensor was used for the potentiometric quantification of anionic surfactants in detergents and commercial household care products. The DHBI-TPB ion-pair was characterized by FTIR spectroscopy and computational analysis which revealed a crucial contribution of the C–H∙∙∙π contacts for the optimal complex formation. The DHBI-TPB sensor potentiometric response showed excellent analytical properties and Nernstian slope for SDS (60.1 mV/decade) with LOD 3.2 × 10−7 M ; and DBS (58.4 mV/decade) with LOD 6.1 × 10−7 M was obtained. The sensor possesses exceptional resistance to different organic and inorganic interferences in broad pH (2–10) range. DMIC used as a titrant demonstrated superior analytical performances for potentiometric titrations of SDS, compared to other tested cationic surfactants (DMIC > CTAB > CPC > Hyamine 1622). The combination of DHBI-TPB sensor and DMIC was successfully employed to perform titrations of the highly soluble alkane sulfonate homologues. Nonionic surfactants (increased concentration and number of EO groups) had a negative impact on anionic surfactant titration curves and a signal change. The DHBI-TPB sensor was effectively employed for the determination of technical grade anionic surfactants presenting the recoveries from 99.5 to 101.3%. The sensor was applied on twelve powered samples as well as liquid-gel and handwashing home care detergents containing anionic surfactants. The obtained results showed good agreement compared to the outcomes measured by ISE surfactant sensor and a two-phase titration method. The developed DHBI-TPB surfactant sensor could be used for quality control in industry and has great potential in environmental monitoring.

Item Type: Article
Uncontrolled Keywords: anionic surfactants ; sensor ; potentiometry ; detergents ; nonionic surfactants ; household detergents ; molecular dynamics simulations
Subjects: TECHNICAL SCIENCES > Interdisciplinary Technical Sciences
Divisions: Division of Organic Chemistry and Biochemistry
Project titleProject leaderProject codeProject type
In-silico potpomognut dizajn supstrata za hvatanje CO2 u katalitičkoj formaciji karbonata i karbamata-INDICATIORDean MarkovićIP-2019-04-8846HRZZ
Dizajn, sinteza i računalna analiza novih optičkih kemijskih pH osjetilnih derivata benzazola-BenzpHSensRobert VianelloIP-2020-02-8090HRZZ
Depositing User: Robert Vianello
Date Deposited: 29 Jun 2021 08:45
DOI: 10.3390/molecules26123627

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