“…First, waterproofing was made on the gas phase side of the membrane, which was opposite to the side of AOD and FALDH being immobilized, because the AOD-FALDH membrane was hydrophilic, and thus, the NAD + solution in the flow-cell had leaked into The device configuration of the MeOH bio-sniffer was similar to the ones in our previous studies except for the membrane [39,43,44]. Briefly, it consisted of a bifurcated optical fiber (PVSMA2-2 STU600-STUH190S, Mitsubishi Cable Industries, Tokyo, Japan), an optical fiber probe (F1000-900, Ocean Insight, Orlando, FL, USA), a UV light emitting diode (UV-LED, UF4LU-0GD01, DOWA, Tokyo, Japan), and a photomultiplier tube (PMT, C9692-11, Hamamatsu Photonics, Shizuoka, Japan).…”