Inner filter effect mediated fluorescence properties as a tool to monitor the quantity of grape-must caramel in balsamic vinegar

Abstract

Abstract E-150d caramel, known as grape-must caramel in the vinegar industry, may be added legally and without restriction to balsamic vinegar to improve the final color. Although its quantification in vinegar was studied with other techniques, a straightforward and quick method is lacking. Hence, the inner filter effect (IFE) was proposed to be mediated by concentration-dependent Laser-induced fluorescence (LIF) intensity and could be used to quantify caramel in balsamic vinegar.