Methods and devices for microfluidic detection of a biological maker in a biospecimen collected from a subject are disclosed. The microfluidic devices include nanoparticle-based nanosensors comprising supramolecular recognition sequences, protease consensus sequences, post-translationally modifiable sequences, or sterically hindered benzylether bonds for specific interaction with a biological marker. Also disclosed are particular nanosensors for detecting cytokines, and other proteins based upon supramolecular recognition without chemical modification or enzymatic cleavage.