Abstract
We constructed an imaging system to measure the concentration of acetone gas by acetone reduction using secondary alcohol dehydrogenase (S-ADH). Reduced nicotinamide adenine dinucleotide (NADH) was used as an electron donor, and acetone was imaged by fluorescence detection of the decrease in the autofluorescence of NADH. In this system, S-ADH–immobilized membranes wetted with buffer solution containing NADH were placed in a dark box, and UV-LED excitation sheets and a high-sensitivity camera were installed on both sides of the optical axis to enable loading of acetone gas. A hydrophilic polytetrafluoroethylene (H-PTFE) membrane with low autofluorescence was used as a substrate, and honeycomb-like through-hole structures were fabricated using a CO2 laser device. After loading the enzyme membrane with acetone gas standards, a decrease in fluorescence intensity was observed in accordance with the concentration of acetone gas. The degree of decrease in fluorescence intensity was calculated using image analysis software; it was possible to quantify acetone gas at concentrations of 50–2000 ppb, a range that includes the exhaled breath concentration of acetone in healthy subjects. We applied this imaging system to measure the acetone gas in the air exhaled by a healthy individual during fasting.
Highlights
We investigated the autofluorescence of three types of substrates (H-PTFE, cotton, and cellulose membrane) for enzyme immobilization in the imaging system of acetone gas
It is capable of quantifying acetone gas in a concentration range from 0.05 to 2.00 ppm, caused by metabolismofinacetone the fasting state the meal
We developed an imaging and measurement system that can image acetone gas as an NADH fluorescent image using the reduction reaction of secondary alcohol dehydrogenase (S-ADH)
Summary
Since the concentration of VOCs changes with diseases and metabolic abnormalities, measurement and analysis of VOCs in humans may assist in non-invasive evaluations of metabolism and disease screening [4,5,6,7,8,9]. It has been reported, for example, that the air exhaled by patients with diabetes contains higher concentrations of acetone gas than that exhaled by healthy individuals [8,10,11,12].
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