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Fluorescent Paper Strips for the Detection of Diesel Adulteration With Smartphone Read-out

Fluorescent Paper Strips for the Detection of Diesel Adulteration With Smartphone Read-out

Jérémy Bell, Raúl Gotor, Knut Rurack

J Vis Exp. 2018 Nov 9;(141).

PMID: 30474640

Abstract:

Three fluorescent molecular rotors of 4-dimethylamino-4-nitrostilbene (4-DNS) were investigated for their potential use as viscosity probes to indicate the content of kerosene in diesel/kerosene blends, a wide-spread activity to adulterate fuel. In solvents with low viscosity, the dyes rapidly deactivate via a so-called twisted intramolecular charge transfer state, efficiently quenching the fluorescence. Measurements of diesel/kerosene blends revealed a good linear correlation between the decrease in fluorescence and the increase of the fraction of the less viscous kerosene in diesel/kerosene blends. Immobilization of the hydroxy derivative 4-DNS-OH in cellulose paper yielded test strips that preserve the fluorescent indicator's behavior. Combination of the strips with a reader based on a smartphone and a controlling app allowed to create a simple field test. The method can reliably detect the presence of kerosene in diesel from 7 to 100%, outperforming present standard methods for diesel adulteration.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP2844157	4-Dimethylamino-4′-nitrostilbene		2844-15-7	Price

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