Preparation of SERS substrate with 2D silver plate and nano silver sol for plasticizer detection in edible oil. (30th May 2023)

• Record Type: Journal Article
• Authors: Wang, Haonan; Wang, Chuyi; Huang, Jiali; Liu, Yunzhen; Wu, Yang; You, Ruiyun; Zhang, Jian-Han; Lu, Yudong; Shen, Huiying
• Is Part Of: Food chemistry. Volume 409(2023)
• Publication Date: 2023-05-30
• Subjects: Plasticizer -- Phthalate ester -- Potassium hydrogen phthalate -- Surface-enhanced Raman spectroscopy -- Two-dimensional silver plate; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2022.135363
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: Potassium hydrogen phthalate obtained by hydrolyzing phthalate plasticizer has stronger SERS signal. The minimum detection limit of potassium hydrogen phthalate can reach 10 −9 M. Hydrolysis greatly reduces the interference of other complex components in oil and fat to the SERS signal of analyte. The total content of plasticizer in 5 groups of oil samples was successfully detected, and the recovery rate was between 94.5% and 106.0%. Abstract: As a widely used industrial additive of plastic products, phthalate ester (PAE) plasticizers can easily migrate into food, threatening human health. In this work, we proposed a rapid, precise, and reliable method to detect PAE plasticizers in edible oils by using surface-enhanced Raman spectroscopy (SERS) technology. A two-dimensional (2D) silver plate synergizing with a nanosilver sol was prepared as a substrate for SERS to detect potassium hydrogen phthalate (PHP), a hydrolysate of a PAE plasticizer. Detection conditions, such as pH values, drying times, and hydrolysate interference, were optimized. The working curve was well fitted with a linear parameter R 2 of 0.9994, and the minimum detection limit was evaluated as 10 −9 mol/L. Furthermore, the detection accuracy was supported by five edible oil samples. Therefore, using SERS technology to detect PHP is expected to provide an avenue for PAE plasticizer detection in oils and fats, and it features promising potential applications in food safety.