[PMIM]Br@TiO2 nanocomposite reinforced hollow fiber solid/liquid phase microextraction: An effective extraction technique for measurement of benzodiazepines in hair, urine and wastewater samples combined with high-performance liquid chromatography

Graphitic carbon nitrides modified hollow fiber solid phase microextraction for extraction and determination of uric acid in urine and serum coupled with gas chromatography-mass spectrometry

“…As a mixed matrix membrane (MMM), the modified HF has been widely used in sample pretreatment techniques such as HF-LPME, HF-SPME [16,[24][25][26]. To improve the selectivity and sensitivity of analytical methods, carbon-nanotube, grapheme, ceramic metal-oxide and polymer have been applied to modify HF [20,21,[26][27][28][29].…”

Carbon nanotube/polyurethane modified hollow fiber‐pencil graphite electrode for in situ concentration and electrochemical quantification of anticancer drugs Capecitabine and Erlotinib

“…On the other hand, at low pHs, the hydrogen bonds can occur between the protons of the CH 2 groups in the aromatic ring of drugs and the nitrogen atoms of the PUF, which can increase the extraction efficiency .…”

“…The pH of urine was checked and with the help of low amount of NaOH 0.4 M adjusted to pH 7.0. Then 1.0 mL urine was diluted tenfold with the phosphate buffer (0.05 M) at pH 7 . The MWCNT‐PUFIX/HF‐PGE sensor was applied and the LSSPME procedure was carried out.…”

“…On the other hand, due to matrix effects in real samples, a pretreatment step for separation and preconcentration of analytes before analysis is essential. Nanocomposites have been employed as an efficient absorbent for this purpose .…”

Poly(methacrylic acid-ethylene glycol dimethacrylate-N-vinylcarbazole) monolithic column for the enrichment of trace benzodiazepines from urine and beer samples

“…Conventional methods such as LLE and SPE are time consuming and require relatively large volumes of organic solvents, while MAE requires an expensive instrument. Magnetic micro‐solid‐phase extraction , SPME , and LPME were developed for the analysis of BZP residues in different matrices when preconcentration techniques were focused on miniaturization and efficiency. Magnetic micro‐solid‐phase extraction and LPME usually require laborious operation; the extraction fiber for SPME is expensive and fragile, and has relatively low sample capacity.…”