[Brain Fog: A Concept Analysis].

Brain fog is a symptom that has gained increasing attention worldwide since the start of the COVID-19 pandemic, as patients affected by COVID-19 may experience cognitive dysfunction, colloquially known as brain fog, for a period of time after recovery. Brain fog affects activities of daily living and work performance and has the potential to negatively impact society and the economy. However, a clear definition and concept analysis of brain fog is lacking in the literature.

Fluorimetric liquid chromatographic analysis of amantadine in urine and pharmaceutical formulation.

A simple and sensitive liquid chromatographic method is described for the analysis of amantadine and memantine. The method is based on the derivatization of amantadine and memantine extracted from alkalified samples with (2-naphthoxy)acetyl chloride at mild conditions. The resulting derivatives were analyzed by isocratic HPLC with a fluorimetric detector (lambdaex, 227 nm; lambdaem, 348 nm).