1.
Research advances in preparation and application of chitosan nanofluorescent probes.
Liu, P, Wang, R, Su, W, Qian, C, Li, X, Gao, L, Jiao, T
International journal of biological macromolecules. 2020;:1884-1896
Abstract
Nanofluorescent material is developing rapidly as a new type of material. Nanofluorescent probes have broad application prospects in biological analysis, drug metabolism, and semiconductor optical materials. Chitosan is non-toxic and rich in nature which has good biocompatibility, and it can be combined with fluorescent probes. Therefore, the preparation and application of Nanofluorescent probes using chitosan as a carrier is summarized in this article. Fluorescent probes can be combined with other different materials through different reaction mechanisms, and the prepared composite materials can be widely used in biomaterials, sewage treatment, medicine and other fields.
2.
Novel rechargeable calcium phosphate nanoparticle-filled dental cement.
Xie, X, Wang, L, Xing, D, Qi, M, Li, X, Sun, J, Melo, MAS, Weir, MD, Oates, TW, Bai, Y, et al
Dental materials journal. 2019;(1):1-10
-
-
Free full text
-
Abstract
The objectives were to develop a novel rechargeable cement containing amorphous calcium-phosphate nanoparticles (nanoACP) to suppress tooth decay. Five cements were made with: (1) 60% glass particles (experimental control); (2) 40% glass+20% nanoACP; (3) 30% glass+30% nanoACP; (4) 20% glass+40% nanoACP; (5) 10% glass+50% nanoACP. Groups 1-4 had enamel bond strengths similar to Transbond XT (3M) and Vitremer (3M) (p>0.1). The nanoACP cement had calcium and phosphate ion release which increased with increasing nanoACP fillers. The recharged cement had substantial ion re-release continuously for 14 days after a single recharge. Ion re-release did not decrease with increasing recharge/re-release cycles. Groups 3-5 maintained a safe pH of medium (>5.5); however, control cements had cariogenic pH of medium (<4.5) due to biofilm acid. Therefore, nanoACP cement (1) had good bond strength to enamel, (2) possessed calcium and phosphate ion recharge/re-release capability, and (3) raised biofilm pH to a safe level to inhibit caries.
3.
Magnetic solid phase extraction of sulfonamides based on carboxylated magnetic graphene oxide nanoparticles in environmental waters.
Gao, PS, Guo, Y, Li, X, Wang, X, Wang, J, Qian, F, Gu, H, Zhang, Z
Journal of chromatography. A. 2018;:1-10
Abstract
A magnetic nano-adsorbent material was prepared by functionalizing carboxylic group onto the granule surface of magnetic graphene oxide nanoparticles (CMGO), using in-situ co-precipitating method. The surface morphology was characterized by SEM and TEM. The CMGO was selected as the adsorbent for the magnetic solid phase extraction (MSPE) of sulfonamides (SAs) from environmental water samples, and the eluted analytes were determined by ultra high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS). A series of experimental parameters were optimized to improve the extraction efficiency such as amount of CMGO, extraction time, pH, ionic strength of the sample solution and desorption conditions. When the pH of water sample was 4.00, the extraction recoveries (ERs) for SAs were over 82.0% with 15.0 mg CMGO adsorption for 20 min. Under the optimized extraction conditions, linear range was obtained with coefficients of determination (R2)≥0.9983. The limits of detection for this proposed method were in the range of 0.49-1.59 ng/L, and the enrichment factors were 1320-1702 for eight SAs. The newly developed method was successfully applied to the analysis of trace SAs in real-world water samples, which provided satisfactory ERs in the range of 82.0-106.2% with RSDs less than 7.2%. Overall, it shows a great potential for the concentration of trace amine organic pollutions in complex matrices.