Facile and green synthesis of photoluminescent carbon nanoparticles for cellular imaging

Here, a simple, green, and economic method was developed for the synthesis of fluorescent carbon nanoparticles (CPs) by one-step hydrothermal treatment of grape juice, without any additives (e. g. salts, acids, bases, and organic solvents). The as-prepared CPs showed bright blue fluorescence under the irradiation of UV light, with a high quantum yield of 13.5%, good water solubility, excellent stability, and low toxicity, which can be used as an excellent fluorescent probe for cellular imaging.