Smartphone digital image colorimetry combined with deep eutectic solvent-liquid–liquid microextraction for the determination of cobalt in milk and dairy products

化学 反应杯 色谱法 深共晶溶剂 检出限 比色法 分析化学(期刊) 溶剂 共晶体系 无机化学 量子力学 物理 有机化学 合金
作者
Aliyu B. Abdullahi,Salihu Ismail,Usama Alshana,Nusret Ertaş
出处
期刊:Journal of Food Composition and Analysis [Elsevier BV]
卷期号:119: 105263-105263 被引量:7
标识
DOI:10.1016/j.jfca.2023.105263
摘要

Deep eutectic solvent-liquid–liquid microextraction (DES-LLME) was combined with smartphone digital image colorimetry (SDIC) for the determination of cobalt as its chelate with 1-(2-pyridylazo)-2-naphthol. The final extract was placed in a quartz micro-cuvette inside a laboratory-designed colorimetric box from which images of the extract were captured and split into their red-green-blue channels. The intensity of the red channel, found to give the highest intensity, was used to calculate the concentration of cobalt. Optimum SDIC performance was obtained at a distance of 8.0 cm between the cuvette and the detection camera with a 60.0% brightness of the light source at a wavelength of 560 nm and 1600 px2 as the region of interest. Optimum DES-LLME conditions were found as follows: complexation pH of 5.00, 300 µL of DES (choline chloride/phenol, 1:4 molar ratio), 900 µL of tetrahydrofuran within 2.0 min complexation and 2.0 min extraction time. The limits of detection (3Sb/m) and quantitation (10Sb/m) were found as 0.03 and 0.16 µg g−1, respectively. The coefficient of determination (R2) was found to be higher than 0.9966 and the relative standard deviation was lower than 7.8%. The proposed method was applied for the determination of cobalt in milk and dairy products with percentage relative recoveries ranging between 95.0% and 107.5%.
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