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Comparison of percentage radical-scavenging activity (%RSA) between free caffeic acid (CA), caffeic acid grafted onto core–shell silica nanoparticles (ACSSNs-CA), and caffeic-acid-free nanosphere (ACSSNs) with radical 2,2-diphenyl-1-picryl-hydrazyl (DPPH●). Results are reported as means ± SD (n = 3). * p < 0.05.
