Reactive oxygen species-responsive hydrophobic crosslinked chitosan films based on triple-function crosslinkers.

Chitosan is widely used in reactive oxygen species (ROS)-responsive films but remains great challenges owing to its weak mechanical strength and strong hydrophilicity. Herein, we synthesized novel hydrophobic crosslinked CS films with ROS-responsive properties and excellent physicochemical properties. A novel crosslinker, 2-((10-carboxydecyl)thio)succinic acid, with long-chain alkanes, three carboxyl groups, and sulfhydryl groups was synthesized and then used to produce thioether-containing crosslinked CS membranes.

Facile synthesis of N-doped carbon dots for direct/indirect detection of heavy metal ions and cell imaging.

In this study, an approach for the facile, rapid, energy-saving, and sensitive determination of Fe and Cr(VI) was developed. L-arginine/D-glucose carbon quantum dots (Arg/Glu-CQDs), with a photoluminescence quantum yield of 21%, were synthesized from L-arginine and D-glucose through a facile, hydrothermal process. The maximum emission wavelength of Arg/Glu-CQDs was observed at 450 nm, under an excitation wavelength of 365 nm.

Facile fabrication of N/S/P tri-doped carbon dots for tetracycline detection by an internal filtering effect of a two-way matching strategy.

We have developed a facile ultrasound-assisted route to synthesize N/S/P co-doped carbon dots (N/S/P-CDs) in an alkaline solution at room temperature. They demonstrate brightly luminescent and thermo-tunable fluorescence properties and show ultra-high sensitivity for the detection of TC in milk via the inner filter effect (IFE) of a two-way matching strategy.

Fabrication of double crosslinked chitosan/gelatin membranes with Na and pH dual-responsive controlled permeability.

A double crosslinked membrane based on chitosan/gelatin with controlled release properties was synthesized in aqueous system using potassium pyroantimonate and genipin as the ionic crosslinker and covalent crosslinker, respectively. The membranes were characterized using FT-IR, UV-vis spectra, and SEM. In addition, the thermal stability, contact angle, mechanical and controlled release properties were measured.

Machine learning assisted dual-channel carbon quantum dots-based fluorescence sensor array for detection of tetracyclines.

The detection and differentiation of tetracyclines (TCs) has received increasing attention due to the severe threat they pose to human health and the ecological balance. A dual-channel fluorescence sensor array based on two carbon quantum dots (CDs) was fabricated to distinguish between four TCs, including tetracycline (TC), oxytetracycline (OTC), doxycycline (DOX), and metacycline (MTC). A distinct fluorescence variation pattern (I/I) was produced when CDs interacted with the four TCs.

Cellulose based materials for controlled release formulations of agrochemicals: A review of modifications and applications.

Controlled release formulations (CRFs) of agrochemicals have been attracted considerable attention due to their friendliness to environment. The commercial supporting materials for CRFs of agrochemicals are non-degradable, leading to secondary pollution issue. Cellulose, as the most abundant natural materials in the world, is regarded as one of the most ideal substitutes for non-degradable supporting materials thanks to its good biocompatibility and biodegradability.

Ratiometric fluorescent sensor for visual determination of copper ions and alkaline phosphatase based on carbon quantum dots and gold nanoclusters.

In this work, a novel ratiometric fluorescent sensor, based on carbon dots (CDs) and gold nanoclusters (AuNCs), is developed for highly sensitive and selective visual colorimetric detection of Cu and alkaline phosphatase (ALP). The ratiometric fluorescent sensor was synthesized by covalently linking 11-mercaptoundecanoic acid (11-MUA)-stabilized AuNCs to the surface of amino-functionalized CD/SiO nanoparticles. The red fluorescence of the AuNCs can be quenched by Cu owing to coordination between Cu and 11-MUA; however, the blue emission of the CDs was insensitive to Cu owing to the protective silica shell.

Synthesis of a fluorescent ethyl cellulose membrane with application in monitoring 1-naphthylacetic acid from controlled release formula.

A triple-functional (chemical release properties, physical release properties, and monitoring 1-naphthylacetic acid (NAA) release) ethyl cellulose (EC) membrane, modified with fluorescein 1-naphthylacetic acid ester (FNE) and isophorone diisocyanate (IPDI), was prepared (designated as IECF membrane). Fourier transform infrared analysis was conducted to confirm the grafting of FNE to the EC backbone. The chemical and physical release properties of IECF membrane were investigated.

Physicochemical Characteristics and Slow Release Performances of Chlorpyrifos Encapsulated by Poly(butyl acrylate-co-styrene) with the Cross-Linker Ethylene Glycol Dimethacrylate.

Chlorpyrifos' application and delivery to the target substrate needs to be controlled to improve its use. Herein, poly(butyl acrylate-co-styrene) (poly(BA/St)) and poly(BA/St/ethylene glycol dimethacrylate (EGDMA)) microcapsules loaded with chlorpyrifos as a slow release formulation were prepared by emulsion polymerization. The effects of structural characteristics on the chlorpyrifos microcapsule particle size, entrapment rate (ER), pesticide loading (PL), and release behaviors in ethyl alcohol were investigated.

Enhancement of the controlled-release properties of chitosan membranes by crosslinking with suberoyl chloride.

A novel crosslinking agent, suberoyl chloride, was used to crosslink N-phthaloyl acylated chitosan and improves the properties of chitosan membranes. Membranes with different crosslinking degrees were synthesized. The derivatives were characterized by Fourier transform infrared spectroscopy and ¹³C solid state nuclear magnetic resonance spectroscopy, which indicated that the crosslinking degrees ranged from 0 to 7.