An innovative nano-sorbent for selective solid-phase extraction and spectrophotometric determination of p-amino benzoic acid in cosmetic products

International Journal of Cosmetic Science
Hossein Abdolmohammad-ZadehE Rahimpour

Abstract

A novel nano-sorbent was developed for selective extraction and pre-concentration of p-amino benzoic acid (PABA) prior to determination by spectrophotometry. Selective extraction of PABA from aqueous solutions was performed using a solid-phase extraction column packed with 200 mg of nickel-zinc-aluminium layered double hydroxide (Ni-Zn-Al LDH) as a nano-sorbent. Extraction procedure is based on the adsorption of p-amino benzoate ions on the Ni-Zn-Al-nitrate LDH and/or their exchanging with LDH interlayer nitrate ions. After elution of extracted analyte by 2.5 mL of 2 mol L(-1) NaCl solution, its concentration was determined spectrophotometrically at λmax = 268 nm. The spectrophotometry method gave a linear response for PABA within the range of 12.5-425.0 μg L(-1) with a correlation coefficient of 0.9994. In the optimum experimental conditions, the limit of detection and sorption capacity were 3.78 μg L(-1) and 21.25 mg g(-1) , respectively. The presented method uses mild separation conditions and is a sensitive, reproducible, simple, low-cost and environment-friendly technique that could be used for the extraction and determination of PABA in various cosmetic samples.

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Related Concepts

Nickel hydroxide (III)
Zinc hydroxide
Alhydrogel
Cosmetics
Hydroxides
Nickel
Paraminol
Spectrophotometry, Ultraviolet
Zinc Compounds, Inorganic
Nanostructured Materials

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