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]).