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Background Solid-phase microextraction (SPME) is a versatile sampling and sample preparation technology that possess a significant application in the extraction and pre-concentration of a broad range of micro-pollutants from different kind of matrices. Selection and preparation of an appropriate fiber substrate and coating materials have always been the main challenges of the SPME procedure. This paper introduces a high-efficiency metal-based SPME fiber with a new chemical coating of nickel/graphene oxide/nickel tetraazamacrocyclic complex (Ni/GO/NiTAM). Result The Ni/GO/NiTAM sorbent was electroless deposited onto the surface of an aluchrom (Alu) wire, and then the prepared fiber was employed for the extraction and pre-concentration of some PAHs before their HPLC–UV analysis. The prepared fiber characterization data were assessed using FE-SEM, EDX, XRD, FT-IR, and BET techniques. The method validation parameters, including the linearity range (LRs: 0.10 to 200.0 µg L−1), the limit of detection (LODs: 0.03‒0.30 µg L−1), and the limit of quantification (LOQs: 0.10–1.00 µg L−1), under optimal conditions. The relative standard deviations (RSDs) of intra-day, inter-day, and single fiber repeatability (for the samples spiked at 25 µg L‒1) were in the range of 0.32–2.94, 1.20–4.09, and 1.42‒4.39%, respectively. In addition, the technique recoveries (RR %) and enrichment factors (EF) were in the range of 83.10‒107.80% and 83–164, respectively. Conclusion The fiber fabrication was simple, and the applied materials were also economical and easily accessible. Alu metal has high physicochemical and mechanical stability and thus can be a good alternative for the substrate of the fragile commercial SPME fibers. High rigidity and durability, long service life, and high extraction capability are some of the other advantages of the offered fiber.

technique with a sol-gel process with high affinity to patulin. Isatin was used as dummy template during polymerization process. The prepared sol-gel polymer was successfully applied to develop a selective on-line-SPE-HPLC procedure for preconcentration and determination of patulin from apple juice samples. The method showed a simple and rapid procedure to analysis patulin with satisfactory precision and recovery. The proposed method did not affect by matrix interferences in apple juice samples.

The present paper introduces a new MIS polymer by combining the imprinting technique with a sol-gel process utilizing isatin as a dummy template. The synthesized sorbent was used to develop a sensitive and rapid online SPE technique for the selective extraction Abstract 5-hydroxymethylfurfural (HMF) is an aromatic compound that is an admitted indicator of reduced quality in different foodstuffs.Here, a novel, sensitive, and simple online solid-phase extraction (SPE) based on a molecularly imprinted sol-gel polymer (MIS) coupled to an HPLC-UV was designed and developed for the extraction and determination of HMF. Under optimum conditions, good linearity was achieved from 0.03 to 0.45 µg ml -1 with relative standard deviations (RSDs) below 5.17%. The Limit of detection (LOD) was 0.023 µg ml -1 , and the recoveries of spiked real samples were more than 97%. The experimental results demonstrated that the proposed procedure is not to be affected by the matrix interfaces and can be successfully utilized for the routine analysis of HMF in different samples.