Utilisation of Carbon Quantum Dots from Hazelnut Husk for Folic Acid (FA) Detection: An Innovative Approach.

This study presents the development of a carbon quantum dot (CQD)-based fluorescence sensor for the accurate quantification of Folic Acid (FA). CQDs were synthesized from hazelnut husk using a solvothermal method and functionalized with silver ions to create an "off-state" fluorescence system. Upon mixing FA solutions, prepared from pure water and pharmaceutical tablets, with phosphate-buffered saline (PBS) and "off-state" CQDs, fluorescence emission was restored ("on-state") in a concentration-dependent manner when excited at 360 nm.