Dual optically responsive paper-membrane for simple, portable, and versatile control of total and volatile acidity in wines

We have developed the first optical sensing method that allows the quantification of the TA and VA in wine. The results presented in this work demonstrate that our optical sensing technology enables direct, simple, reversible, reusable, fast, cost-effective, and environmentally friendly simultaneous dual quantification (fluorescent and colorimetric) of TA and VA in wine samples without the use of additional reagents.