Selective extraction and analysis of phenolic acids in herbal plants using Fe3O4@MXene@PEI aerogel.

A magnetic MXene aerogel (Fe3O4@MXene@PEI) was prepared by crosslinking amino modified MXene with polyethyleneimine using epichlorohydrin as a cross-linker. Adsorption properties of Fe3O4@MXene@PEI aerogel for phenolic acids were evaluated by adsorption kinetics and isotherms experiments, showing that the high adsorption affinity was governed by multilayer chemisorption process. An efficient MSPE/HPLC method was developed for the determination of phenolic acids with excellent selectivity, good linearity (0.025-5.0 µg mL-1), low LODs (0.007-0.017 µg mL-1), and satisfactory recoveries (80.0-120.0 %). Moreover, the antioxidant activity of the Fe3O4@MXene@PEI purified compounds was superior to that of the conventional method as demonstrated by the results of scavenging experiments on 2,2 -diphenyl-1-picrylhydrazyl radical scavenging assay. Finally, 65 organic acids were identified in the Fe3O4@MXene@PEI treated honeysuckle extracts by UHPLC-Q-Exactive Orbitrap MS/MS analysis. The proposed sorbent exhibits remarkable promise for the selective separation and purification of organic acids from herbal products.

How to deal with esthetically overcritical patients who need complete dentures: a case report.

AIM: The purpose of this report is to present a strategy for making a diagnosis and providing appropriate treatment for denture patients with high esthetic demands. BACKGROUND: Some edentulous patients have critical requirements for the esthetic aspect of dentures. REPORT: A 55-year-old edentulous female presented with a complaint of dissatisfaction with the appearance of two sets of old dentures. A complex method was used during the fabrication of a new set of dentures in order to meet her demand for esthetics. SUMMARY: This method essentially improves the mutual communication and cooperation between dentists and patients; therefore, it improves satisfaction of the patients.