College of Food Science and Engineering, Shanxi Agricultural University, Taigu, Shanxi, 030801, China.
College of Food Science and Engineering, Shanxi Agricultural University, Taigu, Shanxi, 030801, China.
Talanta. 2023 Dec 1;265:124831. doi: 10.1016/j.talanta.2023.124831. Epub 2023 Jun 16.
To determine parathion in cereals, hydrophilic and hydrophobic deep eutectic solvents (DESs) were used by digital image colorimetry with smartphones. In the solid-liquid extraction part, hydrophilic DESs were used as extractants to extract parathion from cereals. In the liquid-liquid microextraction part, hydrophobic DESs dissociated into terpineol and tetrabutylammonium bromide in situ. The dissociated hydrophilic tetrabutylammonium ions reacted with parathion extracted in hydrophilic DESs under alkaline conditions to produce a yellow product, which was extracted and concentrated by dispersed organic phase terpinol. Digital image colorimetry integrated with the use of a smartphone was used for quantitative analysis. The limit of detection and quantification were 0.003 mg kg and 0.01 mg kg, respectively. The recoveries for parathion were 94.8-106.2% with a relative standard deviation less than 3.6%. The proposed method was applied to analyze parathion in cereal samples: the method has the potential to be applied to pesticide residue analysis in food products.
利用智能手机的数字图像比色法，研究了亲水性和疏水性深共晶溶剂（DES）在谷物中对硫磷的测定。在固液萃取部分，采用亲水性 DES 作为萃取剂从谷物中萃取对硫磷。在液液微萃取部分，疏水性 DES 就地分解为萜品醇和四丁基溴化铵。分解后的亲水性四丁基铵离子在碱性条件下与亲水性 DES 中萃取的对硫磷反应，生成黄色产物，该产物被分散有机相萜品醇萃取和浓缩。数字图像比色法与智能手机的使用相结合用于定量分析。检测限和定量限分别为 0.003mg/kg 和 0.01mg/kg。对硫磷的回收率为 94.8%-106.2%，相对标准偏差小于 3.6%。该方法用于分析谷物样品中的对硫磷：该方法有望应用于食品中农药残留的分析。
