Matchbox Janus membrane fog collector with highly efficient directional transport.

Coordinating the droplet capture, transport, and shedding processes during fog collection to achieve efficient fog collection is a major challenge. In this study, a copper mesh with different wettability was prepared by chemical etching and thiol modification. The Cu(OH) needle structure on the surface of the samples was characterized by FE-SEM and EDS tests, and the surface of the samples was chemically analyzed by infrared and XPS analyses.

Study of the impurity profile and characteristic fragmentation of Δ -isomers in cephapirin sodium using dual liquid chromatography coupled with ion trap/time-of-flight mass spectrometry.

Rationale: According to the requirements of the International Conference on Harmonisation of Technical Requirements for Registration of Pharmaceuticals for Human Use (ICH), the structures of impurities in pharmaceutical products present at over 0.1% need to be confirmed. Therefore, the aim of this study is to separate and identify the impurities in cephapirin sodium drug substances, so as to guide the industry to improve the production process and storage conditions and reduce the amount of impurities in the product.