Fast Differential Analysis of Propolis Using Surface Desorption Atmospheric Pressure Chemical Ionization Mass Spectrometry
Table 3
The loadings and the scores for the first three rotated principal components.
Loadings
Scores
[M–H]−
PC1
PC2
PC3
Sample number
PC1
PC2
PC3
Aa
213
0.369
0.204
0.881
1
−0.815
−0.509
−0.424
217
0.288
0.313
−0.186
2
2.601
0.080
−1.040
219
0.785
0.284
0.505
3
−0.517
−0.796
0.465
229
0.276
−0.082
0.944
4
0.322
−0.553
0.069
245
0.604
0.214
0.668
5
−0.366
−0.416
0.076
249
0.948
0.166
0.208
6
0.979
−0.282
3.289
261
0.774
0.394
0.385
7
1.163
−0.454
0.784
263
0.914
0.154
0.255
8
−0.809
−0.796
−0.608
265
0.892
0.259
0.312
9
−0.014
−0.823
0.381
279
0.912
0.207
0.269
10
0.011
−0.542
1.410
295
0.861
0.289
0.35
11
−1.280
0.620
−0.498
311
0.838
0.331
0.379
12
−0.484
−0.508
−0.076
313
0.941
0.207
0.115
13
−0.806
0.929
−0.510
314
0.944
0.254
0.072
14
0.684
−0.222
1.563
329
0.703
0.164
0.259
15
−0.407
−0.676
−0.343
Bb
253
0.434
0.678
0.321
16
0.864
0.101
0.168
255
0.050
0.760
−0.096
17
−0.785
0.286
−0.419
269
0.390
0.652
0.175
18
1.384
−0.364
−0.742
271
0.089
0.742
0.284
19
−1.438
0.040
−0.618
283
0.615
0.508
0.154
20
−0.799
−0.866
−0.424
247
0.890
0.129
0.320
21
0.371
−0.746
−0.318
303
0.574
0.718
0.317
22
−0.647
0.805
−0.018
267
0.772
0.446
0.295
23
−0.675
0.732
−0.481
285
0.449
0.482
0.414
24
1.967
−0.363
−1.688
Bold fonts indicate high correlation; athe most abundant ions for SDAPCI-MS fingerprints of samples in this study; bsome abundant ions of fingerprints of propolis samples by other MS methods (Pietta et al., [1] 2002; Sawaya et al., 2004 [27]).
