AFM1 Detection in Milk by Fab' Functionalized Si3N4 Asymmetric Mach-Zehnder Interferometric Biosensors.
Tatevik ChalyanCristina PotrichErik SchreuderFloris FalkeLaura PasquardiniCecilia PederzolliRene HeidemanLorenzo PavesiPublished in: Toxins (2019)
Aflatoxins (AF) are naturally occurring mycotoxins, produced by many species of Aspergillus. Among aflatoxins, Aflatoxin M1 (AFM1) is one of the most frequent and dangerous for human health. The acceptable maximum level of AFM1 in milk according to EU regulation is 50 ppt, equivalent to 152 pM, and 25 ppt, equivalent to 76 pM, for adults and infants, respectively. Here, we study a photonic biosensor based on Si 3 N 4 asymmetric Mach-Zehnder Interferometers (aMZI) functionalized with Fab' for AFM1 detection in milk samples (eluates). The minimum concentration of AFM1 detected by our aMZI sensors is 48 pM (16.8 pg/mL) in purified and concentrated milk samples. Moreover, the real-time detection of the ligand-analyte binding enables the study of the kinetics of the reaction. We measured the kinetic rate constants of the Fab'-AFM1 interaction.
Keyphrases
- high speed
- atomic force microscopy
- label free
- human health
- particulate matter
- air pollution
- risk assessment
- loop mediated isothermal amplification
- quantum dots
- heavy metals
- polycyclic aromatic hydrocarbons
- high resolution
- single molecule
- water soluble
- mass spectrometry
- sensitive detection
- ionic liquid
- binding protein
- liquid chromatography
- low cost
- solid phase extraction