Ultrasonic assisted magnetic dispersive solid phase microextraction for preconcentration of two nonsteroidal anti-inflammatory drugs in real water, biological and milk samples employing an experimental design

Sensitive, Accurate and Selective Determination of Cd(II) Using Anodic Stripping Voltammetry with in‐situ Hg‐Bi Film Modified Pencil Graphite Electrode After Magnetic Dispersive Solid Phase Microextraction

“…This causes enhancement in its contact surface with the sample solution (extraction of analyte) or a receiving phase (desorption of analyte) into an organic phase [2]. Sorbent is an important component of SPME because the extraction efficiency, selectivity and sensitivity of analyte extracted from real samples are highly dependent on the selection of a suitable sorbent [4,5]. In this context, nanomaterials and nanocomposites have been widely used as a useful sorbent in the SPE and SPME because they have several advantages such as ease of preparation, ease of surface functionalization for efficient and selective extraction, high surface to volume ratio, mechanical and thermal stability.…”

“…Moreover, MNPs can be easily separated from extraction media by a magnet. However, the direct use of various MNPs is limited due to some of their undesirable properties such as chemical instability, interactions with both analyte and interfering compounds leading to low selectivity, and high aggregation leading to reducing extraction efficiency [4,5]. In order to overcome these problems, functionalized or coated MNPs with different compound(s) have been generally used.…”

“…In order to overcome these problems, functionalized or coated MNPs with different compound(s) have been generally used. In this context, DSPME including bare or functionalized NPs have been integrated with chromatographic [5][6][7][8][9][10], spectroscopic [11][12][13][14][15][16][17][18][19][20] and recently voltammetric [21,22] methods for the determination of various compounds. MNPs-DSPME coupled with HPLC [5][6][7][8], GC [9,10], and UV-Vis spectrophotometry [11] are mostly used in the selective and sensitive determination of organic molecules, while MNPs-DSPME coupled with atomic spectroscopic techniques [12][13][14][15][16][17][18][19][20] and voltammetric techniques [21,22] have been usually used for determination of trace elements.…”

Magnetic Solid-Phase Extraction Based on Poly 4-Vinyl Pyridine for HPLC-FLD Analysis of Naproxen in Urine Samples

“…Solid phase microextraction techniques were also proposed in order to decrease the amount of solvents and its limits of detection achieved when it is coupled to sensitive instrumental techniques [12,13]. Another alternative is dispersive solid phase extraction, d-SPE [14], which it is characterized by the use of adsorbent materials in nanometric scale improving the contact between the adsorbent surface and the analyte [15]. The extraction phase should be modified to improve selectivity, however, nanomaterial separation is complex.…”

Direct determination of piroxicam in pharmaceutical forms using flow injection- spectrophotometry

“…Therapeutic dose of PIX is 20 mg daily, but it can cause several gastrointestinal upset symptoms at high dose [2], therefore, the assay of PIX is recommended to gain the optimal therapeutic level and to ensure good quality assurance in pharmaceutical products. PIX has been determined by several reported methods included high performance liquid chromatography (HPLC) [3,4], extraction by magnetic imprinted polymeric nanosorbent [5], ultrasonic assisted magnetic dispersive solid phase microextraction [6], capillary electrophoresis (CE) [7,8], and voltammetry [9]. The literature reported several spectrophotometric methods [10][11][12][13][14][15][16][17][18][19][20] and a few flow injection methods [21][22][23][24] for the determination of PIX in dosage forms.…”