Selective solid-phase extraction of organophosphorus pesticides and their oxon-derivatives from water samples using molecularly imprinted polymer followed by high-performance liquid chromatography with UV detection

Ionic-liquid-based effervescence-enhanced magnetic solid-phase extraction for organophosphorus pesticide detection in water samples

“…44 However, it was 1-3-fold lower than other methods, such as 60 mg of silica-based magnetic hybrid nanocomposite, 36 75 mg of Ti25-UV-7 silica, 30 100 mg of MCM-41, 31 and 150 mg of polymethacrylate-based sorbent modied with magnetic nanoparticles. 43 It is worth noting that the sample preparation time (4 min) in the present method was in general agreement with that in SPE (>3.25 min), 41 and much shorter than in most other SPE (18.3 min, 30 12 min, 31 13.7 min, 43 and $60 min 42 ) and MSPE (35 min, 36 ] and 450 mL methanol were used as auxiliary solvents to extract the OPs and elute Fe 3 O 4 respectively, which was far less than those methods that required more than 5 mL of organic solvent. 30,31,38,43 Unlike the traditional SPE method, this newly established ILE-MSPE method does not require the use of organic solvents to activate and elute the solid-phase extraction column, which effectively reduces the volume of organic solvents.…”

“…Many approaches have been reported for the assay of OPs, such as magnetic solidphase extraction (MSPE), [36][37][38][39][40] solid-phase extraction (SPE), 35,36,41 and molecularly imprinted polymer solid-phase extraction (MIP-SPE). 42 The ERs (81.4-97.6%) obtained by this proposed method were comparable with other pretreatment methods and better than from solid-phase extraction combined with highperformance liquid chromatography-mass spectrometry (SPE-HPLC-MS) (65-126%) 31 and solid-phase extraction/magnetic solid-phase extraction combined with a high-performance liquid chromatography-diode array detector (SPE/MSPE-HPLC-DAD) (70-95%). 43 The LODs (0.14-0.21 mg L À1 ) offered by the newly developed method substantially matched with other methods and were lower than some SPE (0.2-1.4 mg L À1 ) 30 and MSPE methods (1.8-5.0 mg L À1 37 and 16 mg L À1 38 ).…”

Stir bar sorptive-dispersive microextraction by a poly(methacrylic acid-co-ethylene glycol dimethacrylate)-based magnetic sorbent for the determination of tricyclic antidepressants and their main active metabolites in human urine

“…Furthermore, they can be tuned with different functional groups for specific purposes according to the extraction requirements [ 22 ]. In this respect, polymers made from methacrylic acid (MAA) and ethylene glycol dimethacrylate (EGDMA) as monomer and cross-linker, respectively, i.e., methacrylic acid-co-ethylene glycol dimethacrylate (MAA-co-EGDMA), have been widely used in many different approaches, such as monolith-based microextraction [ 23 , 24 ], molecularly imprinted polymers-based SPE [ 25 ], solid-phase microextraction (SPME) [ 26 , 27 ], or magnetic dispersive SPE [ 28 ]. These types of polymers present a hydrophobic chain structure functionalized with acidic groups, which confers them the capability to establish both hydrophobic and electrostatic interactions [ 24 , 26 ] with basic compounds, such as TCAs.…”

Colorimetric Detection of Organophosphate Pesticides Based on Acetylcholinesterase and Cysteamine Capped Gold Nanoparticles as Nanozyme

“…Nanozymes are those nanomaterials capable of mimicking the functions of enzymes [ 26 ] as these easy-to-synthesise materials exhibited higher stability than proteins under harsh conditions [ 27 , 28 ]. Consequently, their applications in environmental monitoring [ 29 , 30 ] are highly desirable. Enzyme mimicking materials can be categorized into two classes, oxidoreductases and hydrolases [ 31 ].…”