Detection of choline and hydrogen peroxide in infant formula milk powder with near infrared upconverting luminescent nanoparticles. (1st January 2019)

• Record Type: Journal Article
• Authors: Zhang, Ling; Yin, Shuhan; Hou, Jiaze; Zhang, Wenping; Huang, Hui; Li, Yongxin; Yu, Cong
• Is Part Of: Food chemistry. Volume 270(2019)
• Page Start: 415
• Page End: 419
• Publication Date: 2019-01-01
• Subjects: Upconverting nanoparticles -- Luminescence -- Choline detection -- H2O2 detection -- Fe3+ detection; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2018.07.128
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: A novel method for the sensing of H2 O2 and choline was developed. The detection was based on near infrared luminescent UCNPs. The upconversion luminescence was quenched to 3% of its original intensity by Fe 3+ . UCNPs can avoid the interference of fluorescent substances in complex samples. Abstract: Choline is an essential nutrient for the growth and development of the baby, and therefore it is often added to infant formula. In this paper, a novel sensor for choline determination in infant formula is developed based on upconverting nanoparticles (UCNPs) with near infrared luminescence. UCNPs-based detection can avoid the interference of background fluorescence from complex samples, and thus provide high selectivity and sensitivity. It was observed that in the presence of Fe 3+, polyacrylic acid coated UCNPs were quenched to 3% of its original intensity. The degree of quenching was among the best for UCNPs. Hydrogen peroxide could oxidize Fe 2+ to Fe 3+, which caused quenching of the upconversion luminescence. A new H2 O2 detection method was thus established. In addition, choline could be hydrolyzed to betaine by choline oxidase, and at the same time produced H2 O2, which also caused luminescence quenching through Fe 2+ oxidation. Therefore, selective choline sensing was achieved.