Sulfonic acid functionalized hierarchical porous covalent organic frameworks as a SALDI-TOF MS matrix for effective extraction and detection of paraquat and diquat

Electrochemical paraquat sensor based on lead oxide nanoparticles

“…5,6 Moreover, paraquat causes serious damage to human health and is related to Parkinson's disease. 7,8 Conventional methods for paraquat detection are based on spectroscopic techniques such as gas chromatography-mass spectrometry (GC-MS) 9 high performance liquid chromatography (HPLC) 10 surface-enhanced Raman scattering (SERS) spectroscopy 11 surface-assisted laser desorption/ionization time-of-ight mass spectrometry (SALDI-TOF MS) 12 and so on. Although, these methods offer very high accuracy to identify quantity of paraquat in samples, they are very expensive, complicated procedures, long time-consuming and unavailable under on-site eld analysis.…”

Monolithic Gold Nanoparticles/Thiol-β-cyclodextrin-Functionalized TiO2 Nanowires for Enhanced SALDI MS Detection and Imaging of Natural Products

“…Matrix-assisted laser desorption/ionization (MALDI) mass spectrometry (MS) is a powerful soft ionization technique proposed in the late 1980s and has become a preeminent technique for the detection of various molecules. − However, in the low mass region ( m / z < 500), the severe background noise derived from the traditional organic MALDI matrices limits its application in the analysis and imaging of small molecules, especially for low-to-medium resolution MS. , Moreover, ion suppression and relatively low ionization efficiency occur for small molecules in some cases. In this context, surface-assisted laser desorption/ionization (SALDI) MS has emerged as a powerful complementary technique to MALDI MS, owing to its matrix-free application, low background noise, and high detection sensitivity for low-molecular-weight compounds, as well as its high physical/chemical stability . In recent years, the emergence of various nanomaterials has ushered in the rapid development of new SALDI materials. , As a result, SALDI MS has drastically evolved over the past decade into a technique with great potential for providing insights into many of the challenges faced in modern research.…”

Computational Design and Templated Synthesis of Porous Polyether Frameworks with N and O Adsorption Sites for Efficiently Chelating Heavy Metal Ions

“…In general, geometries of POFs are difficult to tune; moreover, yields of preparation of the POFs are usually low . Theoretical calculation is a green, economical, and effective method to simulate geometries and study the properties of POFs. − Kong et al synthesized hierarchical POF materials based on theoretical calculation for capture and utilization of CO 2 . Tan et al synthesized hierarchical POF materials via density functional theory (DFT) calculations for extraction and detection of paraquat and diquat .…”

“…Theoretical calculation is a green, economical, and effective method to simulate geometries and study the properties of POFs. − Kong et al synthesized hierarchical POF materials based on theoretical calculation for capture and utilization of CO 2 . Tan et al synthesized hierarchical POF materials via density functional theory (DFT) calculations for extraction and detection of paraquat and diquat . Based on DFT calculations verifying the microscopic adsorption process, Wang et al designed functionalized COF materials for applications in environmental pollution control …”

“…15 Tan et al synthesized hierarchical POF materials via density functional theory (DFT) calculations for extraction and detection of paraquat and diquat. 17 Based on DFT calculations verifying the microscopic adsorption process, Wang et al designed functionalized COF materials for applications in environmental pollution control. 18 To date, several methods, such as solid-state reaction, 19 selfassembly, 20 and templating methods, 21 have been developed to synthesize POFs.…”