Table 1.

Identified metabolites from metabolomic analysis on two classes of samples: dual biofilm cultures of C. albicans and K. pneumoniae in the presence (class 1) and absence (class 2) of the peptide WMR-K (5 µM). Metabolites (variables) are sorted in ascending order of t test p-value. Arrows indicate the direction (trend) of fold change comparing the two classes: (↑), upregulated in presence of the peptide WMR-K; (↓), downregulated in presence of the peptide WMR-K; (=) no statistically significant change. RI represents Kovats retention index and TMS is the trimethylsilyl function, (CH₃)₃Si-.

	Metabolite	VIP Score	t Test ‘p-Value’	Trend	Fold Change	Functional Category
1	Serine, 3TMS (RI: 1375)	1.627	1.94 × 10−12	↑	8.54	Amino acid metab.
2	2-Isopropyl-3-ketobutyrate, 2TMS (RI: 1463)	1.625	2.40 × 10−12	↑	17.34	−
3	Adenine, 2TMS (RI: 1890)	1.623	6.20 × 10−11	↓	25.75	Nucleotide and energy metab.
4	Tyrosine, 3TMS (RI: 1962)	1.572	7.26 × 10−8	↓	1.48	Amino acid metab.
5	Lysine, 3TMS (RI: 1722)	1.557	1.48 × 10−7	↓	2.91	Amino acid metab.
6	Ornithine, 3TMS (RI: 1632)	1.547	3.40 × 10−7	↓	9.54	Amino acid metab.
7	2-Methylglutaconic acid, 3TMS (RI: 1149)	1.562	4.88 × 10−7	↑	6.32	−
8	Trehalose, 8TMS (RI: 2810)	1.540	5.99 × 10−7	↑	41.65	Stress response
9	Pyruvic acid, 2TMS (RI: 1108)	1.530	1.18 × 10−6	↑	3.35	Glycolysis/ gluconeogenesis
10	Tryptophan, 3TMS (RI: 2253)	1.499	3.70 × 10−6	↓	3.04	Amino acid metab.
11	Methionine, 2TMS (RI: 1536)	1.491	6.41 × 10−6	↓	1.65	Amino acid metab.
12	Asparagine [-H2O], 2TMS (RI: 15616)	1.440	3.06 × 10−5	↓	1.53	Amino acid metab.
13	Butanoic acid, 3TMS (RI: 1425)	1.431	4.40 × 10−5	↑	1.38	Lipid metab.-
14	Glutamic acid, 3TMS (RI: 1638)	1.361	2.42 × 10−4	↓	1.26	Amino acid metab.
15	Glycerol, 3TMS (RI: 1290)	1.352	2.55 × 10−4	↑	1.52	Stress response, lipid metab.
16	Phenylalanine, 2TMS (RI: 1647)	1.326	4.74 × 10−4	↓	1.22	Amino acid metab.
17	Threonine, 3TMS (RI: 1400)	1.298	1.46 × 10−3	↓	1.16	Amino acid metab.
18	Beta-lactic acid, 2TMS (RI: 1156)	1.208	1.50 × 10−3	↑	1.82	Stress response
19	Uridine, 3TMS (RI: 2594)	1.302	1.58 × 10−3	↑	6.71	Nucleotide metab.
20	Glyceric acid, 3TMS (RI: 1346)	1.146	3.22 × 10−3	↑	1.66	Lipid metab.
21	3-Deoxy-D-arabino-hexonic acid γ-lactone, 3TMS (RI: 1797)	1.188	3.74 × 10−3	↑	26.13	-
22	Acetamide, N,N-diethyl- (RI: 1045)	1.136	5.98 × 10−3	↓	1.53	-
23	Vitamin B6, 3TMS (RI: 1924)	1.055	1.29 × 10−2	↑	3.29	Stress response
24	Cyclo-(Phe-Pro) (RI: 2434)	1.190	1.34 × 10−2	↑	3.05	Secondary metab.
25	Arabitol, 5TMS (RI: 1750)	1.002	2.39 × 10−2	↑	1.17	Glycolysis/ gluconeogenesis
26	Nicotinic acid, TMS (RI: 1304)	0.971	3.60 × 10−2	↓	1.77	Nicotinate metab
27	2-Aminobutyric acid, 2TMS (RI: 1149)	0.898	3.64 × 10−2	↓	1.56	Amino acid metab.
28	Phosphate, 3TMS (RI: 1297)	0.888	4.64 × 10−2	↑	1.59	Energy metab.
29	Succinic acid, 2TMS (RI: 1322)	0.896	6.97 × 10−2	↑=	1.10	Citrate cycle
30	Uracil, 2TMS (RI: 1351)	0.722	1.18 × 10−1	↑=	1.23	Nucleotide metab.
31	Valine, 2TMS (RI: 1230)	0.810	1.35 × 10−1	↓=	1.06	Amino acid metab.
32	Isoleucine, 2TMS (RI: 1307)	0.645	1.62 × 10−1	↓=	1.99	Amino acid metab.
33	Nicotinate, methyl 5-(1-Methoxyethyl) (RI: 1354)	0.678	1.75 × 10−1	↓=	1.12	Nicotinate metab.
34	Proline, 2TMS (RI: 1314)	0.690	1.80 × 10−1	↑=	1.98	Amino acid metab.
35	Glycine, 2TMS (RI: 1136)	0.650	2.87 × 10−1	↓=	1.15	Amino acid metab.
36	Aspartic acid, 3TMS (RI: 1540)	0.526	3.16 × 10−1	↑=	1.12	Amino acid metab.
37	Leucine, 2TMS (RI: 1286)	0.430	4.23 × 10−1	↓=	1.24	Amino acid metab.
38	Citric acid, 4TMS (RI: 1844)	0.492	6.38 × 10−1	↓=	1.14	Amino acid metab.
39	Alanine, 2TMS (RI: 1124)	0.448	7.34 × 10−1	↑=	1.03	Amino acid metab.
40	Lactic acid, 2TMS (RI: 1083)	0.392	7.49 × 10−1	↓=	1.39	Stress response
41	Pyroglutamic acid, 2TMS (RI: 1546)	0.232	8.96 × 10−1	↓=	1.02	Amino acid and glutathione metab.
42	Cytosine, 2TMS (RI: 1546)	0.256	9.72 × 10−1	↑=	1.01	Nucleotide metab.