Table 2.

The detailed information of 13 significantly changed metabolites among HP, P, and PB groups ^*.

Model	Specific Name	m/z a	rt(s) b	P vs HP			PB vs P
				VIP c	FC d	p-value	VIP c	FC d	p-value
ESI-	L-gulono-1,4-lactone	195.05081	387.357	4.27301971	7.979424421	0.017582821	3.906341727	0.113596458	0.029565625
ESI-	Ethyl sulfate	124.99066	38.071	1.882300315	7.075238951	0.013742364	1.292556755	0.136934342	0.025845551
ESI-	Quinate	191.05593	345.186	3.173086907	5.276268253	0.002457568	1.455844085	0.362811164	0.039252262
ESI-	D-glucarate	191.01949	263.965	2.369376541	3.646624883	0.008140489	2.386902382	0.172475162	0.027773458
ESI-	1,2-propanediol, 3-(1,3-benzodioxol-5-yl)-	195.05076	424.711	1.835589385	3.597884209	0.030419397	1.721596256	0.205156794	0.024078796
ESI-	3-Methoxy-4-Hydroxyphenylglycol Sulfate	263.02291	50.099	2.906884199	3.453605621	0.003080449	3.174853095	0.259107401	0.003582272
ESI+	Betaine	118.086	264.934	17.57192332	2.739920259	0.001233787	15.37404912	0.503744169	0.014949984
ESI+	Trigonelline	138.05419	283.845	2.373539161	2.186249216	0.019879179	3.007366424	0.378027272	0.00426738
ESI+	Fenpropidin	274.27371	60.342	4.551799883	0.692642154	0.007369509	2.088344672	0.703853494	0.019033832
ESI+	Palmitoyl 3-carbacyclic phosphatidic acid	413.26432	116.372	3.758160942	0.418147894	0.017807482	3.366001471	1.936188022	0.038522023
ESI-	5 beta-androstan-3alpha-ol-17-one Sulfate	369.17338	33.0335	5.632922694	0.399757525	0.038920948	6.557939453	2.900713193	0.004282649
ESI-	Biocytin	371.18864	35.274	2.481678326	0.343132465	0.027963888	3.599344931	3.172244195	0.001949106
ESI+	Cyclohexylamine	100.11085	71.223	4.009630411	0.289296434	0.040504798	5.697031322	3.784354688	0.03088384

^* The relative abundance of these metabolites in each group has been deposited in the public databases of Metabolomics Workbench (ST002475) and Metabolights (MTBLS7119).

^am/z means the mass-to-charge ratio of each metabolite.

^brt(s) refers to the retention time of metabolite on the chromatography, i.e., the peak time, which is expressed in second.

^cVIP, the variable Importance for projection; the larger of the value, the more important.

^dFC means fold changes of metabolite in the compared groups.