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Phosphate-Cr-MOF/polysulfone porous beads as sorbent in the pipette tip-μSPE method for determination of phthalate esters in food matrices
Original title: Phosphate- Cr-MOF/polysulfone porous beads as sorbent in the pipette tip-μSPE method for determination of phthalate esters in food matrices
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Chemicals called phthalates can leach from plastic packaging, bottles, and containers into the food and drinks we consume, and scientists need reliable ways to detect them to understand our exposure. This study developed a new, more efficient testing method using specially designed absorbent beads that can accurately detect tiny amounts of these chemicals in milk, bottled water, and juice. While this research is about improving detection tools rather than testing new products, better testing methods are an important step toward monitoring and eventually reducing our exposure to these chemicals from everyday food packaging.
Phthalate esters (PAEs) are highly susceptible to leaching from plastic packaging into food products during processing, transport, and storage. Therefore, in this study, a newly synthesized sorbent material, phosphate-MIL-101(Cr)-NH2/ polysulfone (PSF) porous beads, was introduced into a pipette tip micro-solid phase extraction coupled to HPLC-PDA for the quantification of six PAEs from food matrices. The porous beads effectively address the issue of the excessive backpressure in PT-μSPE, improve the reproducibility and stability of the adsorbent, and serve as an efficient adsorbent. Key experimental factors affecting extraction efficiency were optimized using a response surface methodology (RSM) model using central composite design (CCD). The synthesized porous sorbent material was characterized by SEM, TGA, EDS, FTIR, XRD, and N2 adsorption analysis. The addition of phosphate functionality to the MIL-101(Cr)-NH2 particles and polyvinylpyrrolidone (PVP) to polysulfone increases the extraction efficiency of the adsorbent and the porosity of the polymer. This method shows a reliable, rapid, and efficient approach with satisfactory EF, low LOD (0.3-4.0 μg/L), linearity range of (1.0-250.0 μg/L), and good precision RSD (1.2-4.3 %) in milk, PET bottled water, and juice.
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