Differentiation in MALDI-TOF MS and FTIR spectra between two closely related species Acidovorax oryzae and Acidovorax citrulli

Table 4 The band area values of various functional groups and protein/lipid ratio values in Acidovorax oryzae (Ao) and Acidovorax citrulli (Ac) strains

Functional groups	Ao (n = 10)	Ac (n = 10)	P-value
Band area value
CH₃ asymmetric stretching	0.152 ± 0.002	0.183 ± 0.010	^*
CH₃ symmetric stretching	0.053 ± 0.004	0.036 ± 0.002	^*
Amide I	3.603 ± 0.021	1.668 ± 0.036	^***
Amide II	1.931 ± 0.012	1.150 ± 0.011	^**
PO₂^- asymmetric stretching	0.379 ± 0.062	0.801 ± 0.008	^**
PO₂^- symmetric stretching	1.061 ± 0.051	1.182 ± 0.036	^**
Protein/lipids ratio
CH₃ symmetric/CH₃ asymmetric	0.349 ± 0.044	0.196 ± 0.015	^***
DNA/Protein ratio
PO₂^- asymmetric/Amide II	0.196 ± 0.006	0.697 ± 0.007	^***

Data are the mean of the 10 strains. ^*: p < 0.05, ^**: p < 0.01, ^***: p < 0.001.

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