Polydopamine-coated magnetic Spirulina nanocomposite for efficient magnetic dispersive solid-phase extraction of aflatoxins in pistachio. (30th May 2022)

• Record Type: Journal Article
• Authors: Karami-Osboo, Rouhollah; Ahmadpoor, Fatemeh; Nasrollahzadeh, Mahmoud; Maham, Mehdi
• Is Part Of: Food chemistry. Volume 377(2022)
• Publication Date: 2022-05-30
• Subjects: Aflatoxins -- Magnetic Spirulina -- Polydopamine -- Magnetic dispersive solid-phase extraction -- HPLC-FD -- Pistachio; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2021.131967
• Languages: English
• ISSNs: 0308-8146

Abstract

Graphical abstract: Highlights: Polydopamine-coated magnetic Spirulina nanocomposite was successfully synthesized. Nanocomposite was used for efficient adsorption of aflatoxins in pistachio. Easy adsorbent separation from the sample matrix was achieved by a magnetic field. Adsorption process including hydrogen bonding, hydrophobic and π-π interactions. Comparative evaluations showed good figures of merit by the developed method. Abstract: An efficient adsorbent was synthesized and used in magnetic dispersive solid phase extraction (MDSPE) of aflatoxins B1, B2, G1, and G2 at trace levels in pistachio prior to analysis by HPLC equipped with a fluorescence detector. Spirulina (Sp) algae was first magnetized, followed by surface modification with dopamine (Dp). The adsorbent was characterized using FT-IR, XRD, FE-SEM, EDX, VSM, and BET analyses. The effects of different analytical parameters on the extraction performance were evaluated. Under optimal conditions, good limits of detection (LODs) and quantifications (LOQs) were achieved in the ranges of 0.02–0.07 and 0.06–0.21 ng g −1, respectively. The RSDs were 5.9, 6.3, 5.6, and 7.3% for AFB1, G1, B2, and G2, respectively. The proposed method was successfully used to determine AFs in pistachio samples and acceptable recoveries in the range of 72–95% were obtained.