Optical Detection of Acetone Using ?Turn-Off? Fluorescent RiceStraw Based Cellulose Carbon Dots Imprinted onto Paper Dipstickfor Diabetes Monitoring

Persistent bad breath has been reported as a sign of serious diabetes health conditions. If an individual's breath has astrong odor of acetone, it may indicate high levels of ketones in the blood owing to diabetic ketoacidosis. Thus, acetone gas in thebreath of patients with diabetes can be detected using the current easy-to-usefluorescent test dipstick. In another vein, rice strawwaste is the most well-known solid pollutant worldwide. Thus,finding a simple technique to change rice straw into a valuablematerial is highly important. A straightforward and environmentally friendly approach for reprocessing rice straw as a startingmaterial for the creation offluorescent nitrogen-doped carbon dots (NCDs) has been established. The preparation process of NCDswas carried out via one-pot hydrothermal carbonization using NH4OH as a passivation substance. A testing strip was developed onthe basis of cellulose CD nanoparticles (NPs) immobilized onto cellulose paper assay. The NCDs demonstrated a quantum yield of23.76%. Afluorescence wavelength was detected at 443 nm upon applying an excitation wavelength of 354 nm. NCDs demonstratedremarkable selectivity for acetone gas as theirfluorescence was definitely exposed to quenching by acetone as a consequence of theinnerfilter effect. A linear correlation was observed across the concentration range of 0.5-150 mM. To detect and measure acetonegas, the present cellulose paper strip has a"switch off"fluorescent signal. A readout limit was accomplished for an aqueous solutionof acetone as low as 0.5 mM under ambient conditions. The chromogenicfluorescence of the cellulose assay responsiveness dependson thefluorescence quenching characteristic of the cellulose carbon dots in acetone. A thinfluorescent cellulose carbon dot layer wasdeposited onto the surface of cellulose strips by a simple impregnation process. CDs were made using NP morphology and analyzedusing infrared spectroscopy and transmission electron microscopy. The carbon dot distribution on the paper strip was evaluated byscanning electron microscope and energy-dispersive X-ray analysis. The absorption andfluorescence spectral analyses wereinvestigated. The paper sheets'mechanical qualities were also examined.