Application of MALDI-TOF mass spectrometry and specific PCR for tracking of E. coli O157:H− strain 431/97 in Batavia lettuce

Chemical and Biological Technologies in Agriculture

Table 2 Results of the MALDI biotyping of selected isolates of the autochthonous microbiota of Batavia lettuce rhizo- and phyllosphere

Isolate number	Source	Matched pattern	Score value
Identification at species level
4b	R	Enterobacter cloacae 13159_1 CHB	2.208
16	P	Pseudomonas kilonensis DSM 1364^T HAM	2.375
32d	R	Pseudomonas koreensis 2_2 TUB	2.278
34	R	Pantoea agglomerans CCM 4413 CCM	2.557
50	R	Pseudomonas corrugata DSM 7228^T HAM	2.072
62	P	Pseudomonas brassicacearum DSM 13227^T HAM	2.457
105	R	Delftia acidovorans CCM 2410 CCM	2.296
128	R	Pseudomonas tolaasii LMG 2342^T HAM	2.021
161	R	Achromobacter spanius LMG 5911^T HAM	2.214
238	R	Achromobacter denitrificans DSM 30026^T DSM	2.160
240	R	Achromobacter piechaudii DSM 11386 DSM	2.313
243	R	Pseudomonas thivervalensis DSM 13194^T HAM	2.171
253	R	Variovorax paradoxus DSM 647 DSM	2.106
Identification at genus level
29	R	Citrobacter koseri 9553_1 CHB	1.997
45	R	Stenotrophomonas maltophila 10942 CHB	1.801