Biodegradable colorimetric sensor based on starch/Alizarin Red S for naked-eye detection of free formaldehyde content in hair care products

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Movahedi F.; Ezoddin M.; Adlnasab L.; Aminpoor M.

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Journal Paper

Paper Information

Journal: Advances in the Standards & Applied Sciences Year:2022 | Volume:1 | Issue:1 Page(s): 18-24

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Information Journal Paper

Title

Biodegradable colorimetric sensor based on starch/Alizarin Red S for naked-eye detection of free formaldehyde content in hair care products

Author(s)

Movahedi F. | Ezoddin M. | Adlnasab L. | Aminpoor M. | Issue Writer Certificate

Keywords

Biodegradable sensor

Starch

Formaldehyde

Hair-care products

Naked eye

Abstract

We present the construction of a biodegradable colorimetric sensor on the microtube lid for Formaldehyde determination via naked-eye detection and /or UV–Vis spectrophotometry. Alizarin Red S (ARS) was subjected as the effective reagent for Formaldehyde detection by incorporation in a thin film of Starch. The sensor was accredited by the reaction of Formaldehyde with ARS based on a color response from purple to yellow at pH 12. The sensor characterization was obtained by Fourier-transform infrared (FT-IR) spectroscopy, field emission scanning electron microscope (FE-SEM), and energy-dispersive X-ray (EDX) spectroscopy analytical methods. The effect of the main parameters on the detection of Formaldehyde was studied and optimized. Under optimal conditions, the linearity range of colorimetric response was obtained in the concentration range of 0.15-10 mg L−1 with a determination coefficient (R2) of 0.9923. A limit of detection (LOD) of 0.05 mg L−1 and a relative standard deviation (RSD, n=5) of 1.2 % were achieved. This method presented a short response time (within 15 min) for the application as biosensing. Subsequently, the concentrations of Formaldehyde in hair care products (hair shampoo and conditioner samples) were successfully obtained with good recoveries.

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