Antioxidant capacities and total phenolic contents of 20 polyherbal remedies used as tonics by folk healers in Phatthalung and Songkhla provinces, Thailand

Table 5 Phyto-constituents identified in three essential oils of Piper retrofractum Vahl., Alpinia galanga L., and Cyperus rotundus L

Medicinal plants	Yield	RT	Compound names	Match Factor	Formula	MW	%Peak area
Alpinia galanga L.	0.43	20.72	β-Bisabolene	95.7	C₁₅H₂₄	204	14.0
		18.91	cis-α-Bergamotene	96.6	C₁₅H₂₄	204	10.0
		21.06	β-Sesquiphellandrene	94.0	C₁₅H₂₄	204	9.7
		8.08	1,8-Cineole	97.3	C₁₀H₁₈O	154	6.0
		16.55	Chavicol, acetate	98.8	C₁₁H₁₂O₂	176	4.3
Cyperus rotundus L.	1.02	21.31	4-Isopropyl-1-methoxy-1,6-dimethyl- −1,2,3,4-tetrahydronaphthalene	90.3	C₁₅H₂₂	202	11.7
		17.52	Copaene	95.2	C₁₅H₂₄	204	5.0
		16.81	α-Cubebene	94.5	C₁₅H₂₄	204	4.7
		21.69	β-Calacorene	89.9	C₁₅H₂₀	200	4.5
		21.61	11-hydroxy-2,3,4,11-tetrahydro-6H-pyrimido[2,1-b]quinazolin-6-one	71.5	C₁₁H₁₁N₃O₂	217	3.9
Piper retrofractum Vahl.	0.87	18.59	Caryophyllene	92.1	C₁₅H₂₄	204	9.4
		20.52	Pentadecane	96.7	C₁₅H₃₂	212	7.4
		19.42	1,4,7,-Cycloundecatriene, 1,5,9,9-tetramethyl-, Z,Z,Z-	95.0	C₁₅H₂₄	204	6.8
		24.78	8-Heptadecene	96.0	C₁₇H₃₄	238	6.8
		25.06	Heptadecane	96.6	C₁₇H₃₆	240	6.1

ISSN: 2662-7671