Solidification of floating organic droplet in dispersive liquid-liquid microextraction as a green analytical tool.

作者: Fotouh R. Mansour , Neil D. Danielson

DOI: 10.1016/J.TALANTA.2017.03.084

关键词: UndecanolMelting pointDisperserAnalytical chemistryPartition coefficientChemistryFreezing pointEmulsionSolventVolatility (chemistry)

摘要: Dispersive liquid-liquid microextraction (DLLME) is a special type of in which mixture two solvents (an extracting solvent and disperser) injected into the sample. The extraction then dispersed as fine droplets cloudy sample through manual or mechanical agitation. Hence, centrifuged to break formed emulsion manually separated. organic commonly used DLLME are halogenated hydrocarbons that highly toxic. These heavier than water, so they sink bottom centrifugation tube makes separation step difficult. By using low density, extractant floats on surface. If selected such undecanol has freezing point range 10-25°C, floating droplet can be solidified simple ice-bath, transferred out matrix; this known solidification (SFOD). Coupling SFOD combines advantages both approaches together. DLLME-SFOD process controlled by same variables conventional extraction. extractants must immiscible with lower volatility, high partition coefficient melting points. efficiency affected types volumes disperser, salt addition, pH, temperature, stirring rate time. This review discusses principle, optimization variables, disadvantages some applications food biomedical analysis.

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