Table 2.
Hydrophilic constituents of the inner and outer barks identified by GC-MS (percentage of dry-weight extract, average of two measurements)

Constituents	Retention time (min)	P. elliotii		P. caribeae		P. oocarpa		P. merkusii		P. montezumae		P. insularis		Similarity Index (%)
		IB	OB	IB	OB	IB	OB	IB	OB	IB	OB	IB	OB
Nitrogenous compounds		23.58	10.38	23.21	9.6	22.62	18.31	38.46	11.85	21.6	12.25	18.69	21.31
Pyrazinea	5.4	7.29	1.47	9.16	1.53	9.70	1.99	9.64	2.15	6.24	1.83	8.11	2.97	69
Glycinea	6.0	-	-	0.87	-	0.03	3.34	0.17	-	0.06	-	0.03	-	69
N,O-Bis carbamatea	6.2	4.09	2.24	1.19	0.82	1.92	2.21	5.38	1.23	3.65	1.51	1.15	2.73	83
Methylmalonic monoamidea	6.8	0.37	0.26	0.25	0.27	0.27	0.38	0.46	0.14	0.33	0.13	0.21	0.47	77
Propylaminea	7.0	-	-	0.02	-	0.07	0.02	0.07	-	0.03	-	0.02	-	72
Serinea	7.1	-	-	0.02	-	0.05	-	0.14	-	0.05	-	0.03	-	74
2,5-Furandionea	7.8	0.42	0.26	-	0.23	-	0.42	0.37	0.42	0.45	0.47	0.32	0.35	72
1,3,4-Thiadiazolea	9.5	0.06	-	0.07	-	0.06	-	0.11	-	0.08	-	0.02	5.07	66
Monoamidomalonic acida	9.9	7.45	4.00	7.12	3.41	6.23	7.18	10.32	6.24	6.69	6.29	5.47	6.87	86
Ala-.beta.-Ala, N-TMSa	14.1	0.08	-	-	0.15	-	0.38	-	0.19	0.03	0.16	-	-	73
Malonyldiamidea	14.5	2.42	1.40	2.14	1.54	1.96	1.43	2.96	1.03	1.96	1.01	1.53	1.78	73
N-Acetylglutaminea	15.5	1.39	0.32	2.18	1.18	2.03	0.41	2.73	0.45	1.73	0.36	1.79	0.38	74
1,3,5-Triazinea	18.6	-	-	0.21	-	0.30	-	0.45	-	0.30	-	-	-	67
1H-imidazole-1-carboxamidea	18.7	-	0.44	-	0.48	-	0.54	-	-	-	0.48	-	0.68	58
Normorphinea	37.5	-	-	-	-	-	-	5.66	-	-	-	-	-	49
Sugars		11.23	9.48	10.48	2.77	5.57	6.51	32.58	8.72	5.45	7.83	5.15	12.63
Glycerolb	5.5	1.73	2.54	2.37	1.21	0.49	1.02	8.08	1.98	1.02	1.05	0.37	2.95	91
Xylitolb	15.8	0.86	2.44	2.66	0.12	0.26	0.79	6.40	0.17	0.36	0.52	0.43	1.07	96
D-Psicopyranose, (isomer 2)	17.8	1.21	-	0.48	-	0.85	0.22	1.34	-	0.47	-	0.59	-	94
D-Pinitolb	18.1	2.22	0.37	1.85	0.89	1.79	1.99	8.66	1.34	1.72	2.10	2.29	0.98	93
Glucopyranoseb	19.1	2.23	-	0.95	-	0.66	-	2.38	0.72	0.70	-	0.68	-	96
Galactopyranosea	18.2	-	0.77	0.15	-	0.44	1.00	-	0.19	0.10	1.44	-	2.32	93
D-Mannitolb	20.2	0.03	-	0.69	0.20	-	-	1.52	2.53	-	0.14	0.08	-	95
TMS ether of glucitola	20.3	0.91	1.89	0.20	0.35	0.11	-	-	-	-	0.21	0.12	1.63	95
D-Pinitol, isomera	20.6	0.12	-	0.09	-	0.10	-	1.80	-	0.14	-	0.06	-	70
Glucopyranose, isomera	21.1	1.92	1.48	1.06	-	-	-	2.41	1.38	0.89	0.98	0.52	-	94
D-Glucoseb	21.2	-	-	-	-	0.86	1.48	-	0.43	0.06	1.39	-	3.69	94
Phenolics		1.10	1.07	0.59	0.84	0.35	0.78	4.51	2.71	1.22	0.73	0.61	1.64
Benzoic acid, 4-methoxy-TMS estera	9.6	0.12	-	0.12	-	0.10	0.11	0.19	0.12	0.19	-	0.11	-	65
Hydroxytyrosolc	16.8	0.48	0.90	0.28	0.84	0.12	0.67	1.44	2.60	0.38	0.73	0.35	1.64	93
Ferulic acid TMSc	18.4	0.46	0.17	-	-	-	-	-	-	-	-	-	-	67
p-Trimethylsilyloxyphenyla	19.7	0.03	-	0.13	-	0.11	-	0.78	-	0.19	-	0.02	-	89
TMS catechollactatea	35.3	-	-	-	-	-	-	1.93	-	-	-	0.14	-	55
Thymol-.beta.-d-glucopyranosidea	33.8	-	-	0.06	-	0.02	-	0.18	-	0.46	-	-	-	80

Note : B: Inner bark; OB: Outer bark (-): not detected
Compare with NIST library
Compare with Petersson (1969) and Medeiros and Simoneit (2007)
Compare with Pruestos and Komaitis (2013)