A series of highly porous isoreticular lanthanide-based metal–organic frameworks (LnMOFs) denoted as SUMOF-7I to SUMOF-7IV (SU = Stockholm University; Ln = La, Ce, Pr, Nd, Sm, Eu, and Gd) have been synthesized using tritopic carboxylates as the organic linkers. The SUMOF-7 materials display one-dimensional pseudohexagonal channels with the pore diameter gradually enlarged from 8.4 to 23.9 Å, as a result of increasing sizes of the organic linkers. The structures have been solved by single crystal X-ray diffraction or rotation electron diffraction (RED) combined with powder X-ray diffraction (PXRD). The SUMOF-7 materials exhibit robust architectures with permanent porosity. More importantly, they exhibit exceptionally high thermal and chemical stability. We show that, by inclusion of organic dye molecules, the luminescence properties of the MOFs can be elaborated and modulated, leading to promising …

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One-pot synthesis of cuprous ferrite (CuFeO2) nanoparticles modified with glycerol (glycerol@CuFeO2 NPs) using oligol and reducing agent was reported. The antifungal activities of the nanoparticles for Candida utilis using matrix assisted laser desorption/ionization mass spectrometry (MALDI-MS) are also reported. Glycerol@CuFeO2 NPs are synthesized via hydrothermal method and characterized using TEM, SEM, EDX, XRD, FTIR, DLS, and zeta potential. The data revealed that glycerol@CuFeO2 NPs show an efficient ability to degrade contaminants, such as fungi in the aquatic environment. The proteomic analysis of the pathogenic fungus upon addition of different concentrations of glycerol@CuFeO2 NPs and different incubation times reveals the degradation of high molecular weight protein to small proteins or peptides.

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Raman spectroscopy and surface enhanced Raman spectroscopy (SERS) are expanding their horizons into widespread applications as analytical tools with immense potentials. In the current work, we demonstrated the use of a portable Raman system conjugated with graphene enhanced Raman spectroscopy (GERS) for assessing the freshness of fruits and vegetables. Dual nano-platforms have been used involving the use of gold/silver nanoparticles seeded graphene sheets (Au@G and Ag@G, respectively) as the SERS system for probing the freshness of fruits and vegetables. The data showed that Au@G offered high sensitivity, high resolution and high biocompatibility. A novel and simple GERS method based on a microdrop of Ag@G or Au@G on the fruit surface was used for the evaluation of the freshness of the fruits/vegetables. Fruits and vegetables like Wax apple, Lemon, Tomato, Red Pepper and Carrot …

Applications of ionic liquids (ILs) for mass spectrometry (MS) are a burgeoning area and are promising for real applications. However, the research of ILs for MS is in its infancy and there are a large potential for further applications under the ashes. This review article provided an overview of the current state and the research progress of ILs applications for MS. ILs offered several advantages, such as low vapor pressure, soft ionization, high sensitivity, better separation and microextraction, effectively disperse nanoparticles for nanoprobe technologies, and stable under vacuum and for storage in solution form, that leaded to several applications for MS and assured that ILs carry a brilliant future for analytical purposes. A plethora of ILs with different properties can be designed by various combinations of acid and base moieties and were applied as multifunctional materials. Thus, ILs provided many platforms such as …

A novel zinc-based luminescent metal–organic framework (Zn-MOF) has been successfully constructed based on a designed flexible and electron-rich N-involved linker (HL = 4-(bis(4-(pyridin-4-yl)phenyl)amino)benzoic acid). The framework of this Zn-MOF exhibits a 2-fold interpenetrated network which is composed of (3,3)-c sheets. The Zn-MOF has a strong solid state emission at 512 nm. The luminescence signal of the Zn-MOF can be quenched efficiently by trace amounts of electron-deficient nitroaromatics, especially 2,4,6-trinitrophenol (TNP). The quenching constant (Ksv) for TNP is 2.11 × 104 M−1, indicating that this framework can be employed as an excellent chemical sensor for identifying and quantifying TNP. This work highlights a strategy for designing a N-involved π-electron-rich enhanced ligand with nucleophilic properties for MOF-based materials as sensors. It also paves the way toward exploring …

Rationale
Investigation of nanoparticles for laser desorption/ionization mass spectrometry (LDI‐MS) is routinely reported. However, the effect of surface capping of nanomaterials for LDI‐MS is not well studied.
Methods
Different capping agents of quantum dots (CdTe) affect the spectra quality and sensitivity of protein analysis and protein digestion using trypsin enzyme assisted by microwave. Surface modification of CdTe quantum dots with different capping agents, namely 3‐mercaptopropionic acid (3‐MPA), 4‐aminothiophenol (4‐ATP), 4‐mercaptobenzoic acid (4‐MBA), 11‐mercaptoundecanoic acid (11‐MUA), cysteine (Cys) and thioglycolic acid (TG), were investigated for quantum dots (QDs)‐assisted trypsin protease followed by analysis using mass spectrometry.
Results
CdTe QDs were used as a surface to assist trypsin protease and laser desorption/ionization mass spectrometry (surface‐assisted laser …

Gold nanoparticles (AuNPs) assisted laser desorption/ionization mass spectrometry (GALDI-MS) provided new horizons and offered many functions for various applications. This review summarized AuNPs applications for analytical, biotechnology and proteomics. AuNPs efficiently absorbed the laser radiation and transferred the energy to the analyte for the desorption/ionization process. The unique features of AuNPs such as large surface area and high absorption coefficient lead not only to high resolution, low interference and low limit of detection, but also offered selective detection for certain species. AuNPs provided an excellent surface for the analysis of several species such as small molecules, biomarkers, proteins and cells (pathogenic bacteria or cancer cells). AuNPs played many roles such as surface for LDI-MS, probe and stationary phase for separation or preconcentration. AuNPs modified …