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Figure 5.9
Impact of storage time/age of bacteria on IR results. Source:
Reproduced
from Figure 2 from Ref.
40
.
(a) Principal component analysis of
E. coli
O157:H7 treated at
room temperature for 5 days (RT), 4 °C for 12 days (4C), −18 °C for 20 days (−18C) and
control (control). The cluster analysis model was validated by new treatments (red). (b)
Hierarchical cluster analysis of
E. coli
O157:H7 treated at room temperature for 5 days
(RT), 4 °C for 12 days (4C), −18 °C for 20 days (−18C) and control (C). The dendrogram
function analysis model was validated by new treatments (*). (c) Loading plots of the
first (red), second (green), and third (blue) principal component obtained from PC-
DFA of FT-IR spectra of
E. coli
O157:H7 treated at room temperature for 5 days, 4 °C for
12 days, −18 °C for 20 days and control. (For interpretation of the references to color this
igure legend, the reader is referred to the online version of this topic.)
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