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PCA analysis of VOC in sourdough. Flo indicates fresh dough without fermentation. Co4 and Co8 indicate wholewheat sourdough fermented for 4 and 8 h, respectively. S4 and S8 indicate wholewheat sourdough artificially contaminated with S. aureus (102 cfu/g) and cultured for 4 and 8 h, respectively (n = 6).
