Fundamentals and applications of stir bar sorptive dispersive microextraction: A tutorial review

2021 ◽  
Vol 1153 ◽  
pp. 338271 ◽  
Author(s):  
Víctor Vállez-Gomis ◽  
José Grau ◽  
Juan L. Benedé ◽  
Dimosthenis L. Giokas ◽  
Alberto Chisvert ◽  
...  
Keyword(s):  
Dispersive Microextraction

scholarly journals Estimation of Some Useful Drugs in Water, Urine, and Medical Formulations Following Conventional and Modified Dispersive Microextraction Coupled with HPLC-UV

2021 ◽  
pp. 11-33
Author(s):  
Mitali Sarkar ◽  
Shanku Denrah
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Extraction Efficiency ◽  
Sodium Dodecyl ◽  
Two Phase ◽  
Preconcentration Factor ◽  
Dispersive Microextraction ◽  
Dispersive Liquid Liquid Microextraction ◽  
Thermodynamic Feasibility

Dispersive Liquid-Liquid Microextraction (DLLME) coupled with high-performance liquid chromatography-ultraviolet spectroscopy was developed, as a fast and precise operation, for extractive recovery and estimation of two pharmaceuticals viz. moxifloxacin and galantamine, from water, urine, and medical formulations. The process was investigated for Extraction (ES) and Dispersive Solvent (DS) as well as pH, temperature, and salt concentration. Extraction was found effective using methanol (CH3OH), as the DS, employing 1,1,2,2-tetrachloroethane (C2H2Cl4) and chloroform (CHCl3), as the ES, for moxifloxacin and galantamine respectively. The optimum pH was found to be 6.9 for moxifloxacin and 10.2 for galantamine. Temperature and salt were found to have some influence on the extraction efficiency of moxifloxacin but insignificant for galantamine. An improvement of the operation in terms of the Extraction efficiency (ER %), Preconcentration Factor (PF), thermodynamic feasibility, and greenness were achieved during surfactant aided DLLME (SDS-DLLME), where anionic surfactant (Sodium Dodecyl Sulphate (SDS)) was employed and no DS was required. Interestingly, the volume requirement for ES was found less, compared to that in the conventional DLLME, without compromising the performance. Moreover, quantitative recovery of both the drugs was achieved using a single ES. Thus, mutual separation and simultaneous determination of moxifloxacin and galantamine may be designed. A two-phase separation with concomitant enrichment of the solute in the sediment phase occurred. The drugs in the sediment phase, on subsequent dilution with methanol, were determined using the High Performance Liquid Chromatography-Ultraviolet (HPLC-UV) system. The negative free energy changes for the operation indicated that the process was thermodynamically feasible. The process was found to be effective for the spiked recovery of the studied drugs from real samples viz, water, human urine, and commercial medical formulations.

Solid-phase dispersive microextraction using reduced graphene oxide for the sensitive determination of cadmium and lead in waters

2019 ◽  
Vol 11 (5) ◽  
pp. 635-641 ◽  
Author(s):  
Ignacio López-García ◽  
Juan José Marín-Hernández ◽  
Manuel Hernández-Córdoba
Keyword(s):  
Graphene Oxide ◽  
Cloud Point Extraction ◽  
Solid Phase ◽  
Lead And Cadmium ◽  
Low Concentrations ◽  
Reduced Graphene ◽  
Dispersive Microextraction ◽  
Sensitive Determination ◽  
Cadmium And Lead

The combination of cloud point extraction with ETAAS measurement allows very low concentrations of lead and cadmium to be determined.

Magnetic cellulose nanoparticles as sorbents for stir bar-sorptive dispersive microextraction of polychlorinated biphenyls in juice samples

Talanta ◽  
2019 ◽  
Vol 201 ◽  
pp. 266-270 ◽  
Author(s):  
Feras Abujaber ◽  
Francisco J. Guzmán Bernardo ◽  
Rosa C. Rodríguez Martín-Doimeadios
Keyword(s):  
Polychlorinated Biphenyls ◽  
Cellulose Nanoparticles ◽  
Dispersive Microextraction

scholarly journals Effervescence-Assisted Microextraction—One Decade of Developments

Molecules ◽  
2020 ◽  
Vol 25 (24) ◽  
pp. 6053
Author(s):  
Guillermo Lasarte-Aragonés ◽  
Rafael Lucena ◽  
Soledad Cárdenas
Keyword(s):  
Solid Phase ◽  
Sample Treatment ◽  
External Energy ◽  
Liquid Phase Microextraction ◽  
Sample Matrix ◽  
Target Analytes ◽  
Microextraction Techniques ◽  
Dispersive Microextraction ◽  
Treatment Context

Dispersive microextraction techniques are key in the analytical sample treatment context as they combine a favored thermodynamics and kinetics isolation of the target analytes from the sample matrix. The dispersion of the extractant in the form of tiny particles or drops, depending on the technique, into the sample enlarges the contact surface area between phases, thus enhancing the mass transference. This dispersion can be achieved by applying external energy sources, the use of chemicals, or the combination of both strategies. Effervescence-assisted microextraction emerged in 2011 as a new alternative in this context. The technique uses in situ-generated carbon dioxide as the disperser, and it has been successfully applied in the solid-phase and liquid-phase microextraction fields. This minireview explains the main fundamentals of the technique, its potential and the main developments reported.

Expanding the application of stir bar sorptive-dispersive microextraction approach to solid matrices: Determination of ultraviolet filters in coastal sand samples

2018 ◽  
Vol 1564 ◽  
pp. 25-33 ◽  
Author(s):  
Juan L. Benedé ◽  
Alberto Chisvert ◽  
Carla Moyano ◽  
Dimosthenis L. Giokas ◽  
Amparo Salvador
Keyword(s):  
Solid Matrices ◽  
Dispersive Microextraction ◽  
Coastal Sand
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