## 3 Results and Discussion
### Correlation Analysis between Bacterial Genera and VOCs  
Among the bacterial genus, the VOCs detected were significantly correlated with 9 bacterial genera. As shown in Figure 8, _Enterobacteriaceae_ unclassified was positively correlated with the synthesis of most VOCs, including 17 VOCs (6 alcohols, 7 aldehydes, 1 ketone, 1 furan and 3 hydrocarbons). _Ervinia_ was positively correlated with 14 VOCs (5 alcohols, 4 aldehydes, 1 ketone, 1 furan and 3 hydrocarbons). _Lacrimispora_ was positively correlated with 14 VOCs (6 alcohols, 6 aldehydes and 2 ketones). _Lactococcus_ was positively correlated with 12 VOCs (6 alcohols, 4 aldehydes and 2 ketones). The results suggest that the metabolism of _Enterobacteriaceae_, _Ervinia_, _Lacrimispora_ and _Lactococcus_ could have a great influence on the changes of VOCs. [PERSON] et al. (2017) found that _Enterobacteriaceae_ unclassified and _Lactococcus_ were dominant in traditional pickled radishes and contributed to the VOCs. _Ervinia_ caused red onions stored at 8 \({}^{\circ}\)C to produce VOCs of alcohols and aldehydes ([PERSON] et al., 2017). With the extension of storage time, the accumulation of alcohols in potatoes, such as the  
Figure 6: PLS-DA score plot (**a**), loading plot (**b**) and a permutation test at 200 times (**c**) of vacuum-packaged peeled potato samples during storage. Figure 7: Profile of VOCs with regular changes and values of the VIP of metabolites. formation of branched chain and linear alcohols, may be related to amino acid metabolism and fatty acyl esters under the action of bacteria, respectively [58]. Besides this, _Serratia_, _Pantoea_, _Clostridium_, _Flavobacterium_ and _Clostridia_ were positively correlated with 6, 5, 2, 2 and 1 VOCs, respectively. 1-octen-3-ol, 2-ethyl-1-hexanol, benzyl alcohol, (E)-2-octen-1-ol and 4-pentenal and decanal were positively correlated with _Serratia_. Similarly, 1-octen-3-ol and the isomers of (E)-2-octen-1-ol (2-octen-1-ol) were also found in beef inoculated with _Serratia_[59]. 1-pentanol, 4-pentenal, 2-pentyl-furan, hydrazinecarboxamide and 2,5-di-tert-butyl-1,4-benzoquinone were positively correlated with _Pantoea_, which was also reported to be positively correlated with the synthesis of alcohols [60]. The results indicate that _Serratia_ and _Pantoea_ also impacted the VOCs. Furthermore, spoilage markers were also closely related to the role of bacteria. Ethanol, p-mentha-1,8-dien-7-ol, (E)-2-octen-1-ol, (E)-2-hexenal, heptanal and (E)-2-heptenal were positively correlated with _Enterobacteriaceae_, _Erwinia_, _Lacrimispora_ and _Lactococcus_. Among these, ethanol has been reported to be produced through biosynthesis and bioconversion during the growth of _Lactococcus_ and other microorganisms in fresh vegetables [57]. [PERSON] et al. [55] also found that the biosynthesis of ethanol was accompanied by the growth of _Lactococcus_ in fresh-cut lettuce during the storage. furthermore, _Enterobacteriaceae_ has the ability to ferment cheese to produce ethanol [61]. In addition, 3-methyl-1-butanol and 2-methyl-1-butanol, reported as off-odor components, were positively correlated with _Lacrimispora_, _Lactococcus_, _Clostridia_, _Clostridium_ and _Flavobacterium_. Several studies have identified 3-methyl-1-butanol and 2-methyl-1-butanol as being associated with _Lactococcus_ in cheese. and they could be derived from the proteolytic activity of the bacteria and leucine catabolism [62; 63]. The VOCs detected in this study are complex, and several VOCs (ethanol, hexanal, 3-methyl-1-butanol, 2-methyl-1-butanol and 1-octen-3-ol) may produce an unpleasant flavor. In this research, the combination analysis of the bacterial community dynamics and qualities was applied to fresh-cut products, and the potential impact of the bacterial community on the qualities, especially VOCs, of vacuum-packaged peeled potatoes was predicted. It is necessary to further study the VOCs released by specific microorganisms in potatoes to support the possibility of a comprehensive use of some metabolites as a spoilage marker.