RESUMEN
Perfluorinated alkyl substances (PFASs) are persistent, toxic, ubiquitously distributed, and bioaccumulated substances, which have attracted increasing concern. To investigate the environmental effects of PFASs, there is a need to develop a sensitive, rapid, and efficient method for detecting trace level PFASs. In this study, a conjugated microporous polymer (CMP) with loading of fluorine, fabricated by Sonogashira-Hagihara cross-coupling, was exploited as a solid-phase extraction (SPE) adsorbent. The prepared fluorine-functionalized CMP (FCMP), which showed a large surface area of 1089 m2·g-1, high porosity, and good chemical stability, was used to extract PFASs from water samples. The adsorption mechanism was investigated using a sorption isotherm model, and the main interactions were fluorous and hydrophobic affinity. The FCMP-based SPE combined with high-performance liquid chromatography-tandem mass spectrometry achieved low limits of detection (0.19-0.97 ng·L-1), wide linear range (2-1600 ng·L-1), and good reproducibility (3.4%-12.9%) under the optimal conditions. Furthermore, the approach was utilized for the analysis of three water samples (snow, river water, and irrigation water) to evaluate its reliability, and satisfactory recovery (70.5%-127.5%) was obtained. Thus, FCMP was feasible SPE adsorbents for the selective extraction of PFASs.
Asunto(s)
Fluorocarburos , Contaminantes Químicos del Agua , Cromatografía Líquida de Alta Presión/métodos , Citidina Monofosfato/análisis , Flúor , Fluorocarburos/análisis , Polímeros/química , Reproducibilidad de los Resultados , Extracción en Fase Sólida/métodos , Agua/química , Contaminantes Químicos del Agua/análisisRESUMEN
Circular RNA, a non-coding RNA that forms a covalently closed continuous loop, exists widely in eukaryotic cells. The biogenesis and biological function of this type of RNA indicate that it can play a crucial role in diseases such as tumors, neural system diseases, and cardiovascular diseases; moreover, this RNA may have great potential use as a biomarker in these diseases. Oral squamous cell carcinoma (OSCC) is a common malignancy in oral surgery that is difficult to cure, metastasizes easily, and has poor prognosis. In this review, we summarize the loop-forming mechanisms and functions of circular RNA and describe the progress of current research in the development of oral cancer.