Preparation of magnetic MOFs for use as a solid-phase extraction absorbent for rapid adsorption of triazole pesticide residues in fruits juices and vegetables

Vitamin B6 Cofactor-Conjugated Fluorescent Polymeric Nanoparticles for Nanomolar Detection of Cu(II) and Fe(II) and Their Application in Edible Items

“…The available methods, such as high-performance liquid chromatography, high-performance liquid chromatography-tandem mass spectrometry, ultra-high-pressure liquid chromatography-quadrupole time-of-flight tandem mass spectrometry, atomic absorption spectrophotometry, , flame atomic absorption spectrometry, , X-ray fluorescence and emission quadrupole, , and inductively coupled plasma mass spectrometry − for the detection of copper/iron have limitations of time-consuming and complicated procedures and requirement of sophisticated analytical instruments with a skilled analyst. Therefore, the fluorescence-based method has gained significant interest among analytical chemists to develop fluorescence chemosensors for the facile and real-time detection of copper and iron.…”

ZIF-67-modified magnetic nanoparticles for extraction of phenoxy carboxylic acid herbicides

“…First, 10 mg of ZIF-67@Fe 3 O 4 was added into a brown vial containing 10 mL of sample solution (adjusted to pH = 3). 29 After vortexing for 30 min, the upper liquid was poured out and the adsorbent was separated using magnetic separation. Subsequently, 5 mL of alkaline acetonitrile solution (ammonia water : acetonitrile = 5% : 95% v/v) was added, and the mixture was vortexed for 40 min to elute the target analytes.…”

“…First, 10 mg of ZIF-67@Fe 3 O 4 was added into a brown vial containing 10 mL of sample solution (adjusted to pH = 3). 29 Aer vortexing for 30 min, the upper liquid was poured out and the adsorbent was separated using magnetic separation.…”

Magnetic covalent organic frameworks for rapid solid-phase extraction of phthalate esters and bisphenol A in beverage samples

“…Effective sample pretreatment is an important means to avoid food matrix interference and improve detection sensitivity. 13,14 In recent years, commonly used pretreatment methods mainly include liquid–liquid extraction (LLE), 15 solid-phase extraction (SPE), 16 solid-phase microextraction (SPME), 17 magnetic solid-phase extraction (MSPE), 18 etc. LLE has a wide range of applications, but it requires large amounts of organic solvents and is a labor-intensive process.…”