## Materials and Methods
### Quantification of Ethylene and CO\({}_{2}\) Evolution  
A small volume of 0.5 mL air was taken from canning glass jar and analyzed with a GC17A gas chromatograph (Shimadzu) to measure ethylene and CO\({}_{2}\) concentrations. The GC was equipped with both FID and TCD, 80/100 Porapak N (Supelco, Bellefonte, PA, USA) column (1.8 m \(\times\) 1/8 in \(\times\) 2.1 mm) and a 5605 PC mole sieve (Alltech GmbH, Unterhaching, Germany). As carrier gas, helium was used (constant flow rate: 1.4 mL min\({}^{-1}\)), oven temperature was kept constant at 60 \({}^{\circ}\)C. Measured peaks were integrated using Class-VP chromatography data system software v4.2 (Shimadzu Europa GmbH, Duisburg, Germany). Rates of ethylene release were expressed in ug kg\({}^{-1}\) h\({}^{-1}\), those of CO\({}_{2}\) production in mg kg\({}^{-1}\) h\({}^{-1}\).  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Chemical Group** & **VOCs** & **CAS-Number** & **RI** & **RI\({}_{\text{literature}}\)** & **Quantifier (Qualifier)** \\  & & & & & Ions (m \(x^{-1}\)) \\ \hline esters (21) & Ethyl acetate & 141-78-6 & 903 & 863–908 & 43 (56–61) \\  & Ethyl propionate & 105-37-3 & 963 & 939–976 & 57 (47–75) \\  & Ethyl 2-methylpropanoate & 97-62-1 & 968 & 957–969 & 43 (41–71) \\  & Propyl acetate & 109-60-4 & 977 & 952–996 & 43 (61–73) \\  & Methyl butyrate & 623-42-7 & 988 & 969–993 & 74 (43–71) \\  & Methyl 2-methylbutyrate & 868-57-5 & 1011 & 1000–1010 & 57 (41–88) \\  & Isobutyl acetate & 110-19-0 & 1014 & 1000–1031 & 43 (56–73) \\  & Ethyl butyrate & 105-54-4 & 1035 & 1000–1073 & 71 (43–88) \\  & Ethyl 2-methylbutanoate & 7452-79-1 & 1050 & 1022–1073 & 57 (41–102) \\  & Buryl acetate & 123-86-4 & 1069 & 1049–1105 & 43 (56–73) \\  & 2-methylbutyl acetate & 624-41-9 & 1116 & 1111–1125 & 43 (55–70) \\  & Ethyl valerate & 539-82-2 & 1129 & 1131–1139 & 88 (57–85) \\  & Ethyl 2-butenoate & 10544-63-5 & 1154 & 1158–1158 & 69 (41–99) \\  & Pently acetate & 628-63-7 & 1165 & 1175–1181 & 43 (55–70) \\  & Methyl hexanoate & 106-70-7 & 1178 & 1176–1189 & 74 (43–99) \\  & Ethyl hexanoate & 123-66-0 & 1222 & 1196–1245 & 71 (43–89) \\  & Hexyl acetate & 142-92-7 & 1258 & 1251–1311 & 43 (56–61) \\  & 2-Hexen-1-yl acetate & 10094-40-3 & 1317 & - & \\  & Hexyl butyrate & 2639-63-6 & 1397 & 1393–1410 & 71 (43–89) \\  & Hexyl 2-methylbutanoate & 10032-15-2 & 1414 & 1415–1416 & \\  & Hexyl hexanoate & 6378-65-0 & 1610 & 1596–1599 & 43 (56–117) \\ ketones (2) & 2-Butanone & 78-93-3 & 908 & 875–926 & 43 (57–72) \\  & 1-Penten-3-one & 1629-58-9 & 1020 & 1019–1056 & \\ alcohols (6) & Ethanol & 64-17-5 & 943 & 900–955 & 45 (43–46) \\  & 2-Methyl-1-propanol & 78-83-1 & 1096 & 1029–1114 & 43 (41–42) \\  & 1-Butanol & 71-36-3 & 1143 & 1116–1166 & \\  & 2-Methyl-1-butanol & 1565-80-6 & 1200 & - & 57 (41–56) \\  & 1-Hexanol & 111-27-3 & 1341 & 1339–1396 & -1399–1450 \\  & 2-(2-Ethoxyethoxy)-ethanol & 111-90-0 & 1628 & 1615–1619 & 45 (59–72) \\ aldehydes & Hexanal & 66-25-1 & 1077 & 1048–1120 & 44 (41–56) \\ terpenes (2) & D-Limonene & 5989-27-5 & 1186 & 1176–1238 & 68 (67–93) \\  & \(\alpha\)-Farnesene & 502-61-4 & 1747 & 1720–1764 & 93 (41–69) \\  & Benzenic derivatives & Estragole & 140-67-0 & 1724 & 1624–1661 & 148 (117–147) \\ \hline \hline \end{tabular}
\end{table}
Table 1: All identified volatile organic compounds (VOCs) emitted by intact, freshly cut and variously treated (sHWT/chemical prevention) fresh-cut apple slices as characterized by their CAS registry numbers, calculated retention indices (RI), previously reported retention indexes (RI\({}_{\text{literature}}\)), and quantifier and qualifier ions used for peak integration.