Abstract
A rapid and sensitive method was developed for the preconcentration and quantitation of inorganic anions in virgin olive oil (VOO) by coupling reversed-phase dispersive liquid–liquid microextraction (RP-DLLME) to ion chromatography with conductivity detector (IC-CD). By the use of this method, sulfate, phosphate, nitrate, chloride, and fluoride anions were rapidly extracted from VOO samples into a micro-drop of water, with the possibility of its direct injection into the IC column. The extraction parameters were optimized using a central composite design method. By applying the predicted optimized conditions, an enrichment factor of 50 was obtained with recoveries between 103.3 and 116.4% for the anions. The obtained relative standard deviations were from 3.7 to 12.9% (n = 5), and the detection limits (3σ) of the analytes were between 0.005 and 0.015 mg L−1. Comparison of the developed method with some other relevant techniques indicated that RP-DLLME-IC-CD has superior performances in terms of simplicity, speed, precision, and sensitivity.
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Sahar Rezaeinejad declares that she has no conflict of interest. Payman Hashemi declares that he has no conflict of interest.
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Rezaeinejad, S., Hashemi, P. Rapid and Sensitive Quantitation of Inorganic Anions in Olive Oil by Coupling Reversed-Phase Dispersive Liquid–Liquid Microextraction and Ion Chromatography. Food Anal. Methods 14, 2461–2468 (2021). https://doi.org/10.1007/s12161-021-02071-8
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DOI: https://doi.org/10.1007/s12161-021-02071-8