“…The aldehydes (formaldehyde (FA), acetaldehyde (AA), and propionaldehyde (PA)), which were difficult to quantify with the ST/TD-GC-MS system, were quantitatively analyzed using the DNPH cartridge-HPLC-UV system ( Dutta et al, 2018 , Kim and Kim, 2016 ). Elution of the three aldehydes from the DNPH cartridge was induced by injecting 5 mL of acetonitrile into the DNPH cartridge where aldehyde was collected, and the eluted aldehydes were loaded into the HPLC-UV system, followed by separation and quantitative analysis ( Kim et al, 2020 ). Detailed information concerning our instrumental system is also provided in Table 3 .…”