Table 2
Relative contents of the functional groups in the volatile compounds detected in yuzu, kumquat, lemon and lime

Functional groups	Yuzu			Kumquat			Lemon			Lime
	NO.	Area%	mg/kg	NO.	Area%	mg/kg	NO.	Area%	mg/kg	NO.	Area%	mg/kg
	Alcohols	24	11.54	428.64	27	4.43	27.44	20	5.78	175.12	22	12.38	273.43
Aldehydes	21	1.23	45.88	8	1.63	10.08	17	3.09	93.45	22	11.52	254.38
Esters	16	3.78	140.48	16	4.46	27.63	21	7.74	233.45	14	4.83	106.47
Hydrocarbons	33	82.48	3,063.69	22	83.57	520.09	35	82.59	2,500.19	38	69.93	1,544.83
Ketones	5	0.31	11.48	6	0.66	4.05	4	0.12	3.37	6	0.4	8.93
Oxides	5	0.61	22.85	8	5.21	32.42	6	0.63	19.11	4	0.96	21.12
Total	104	100	3,713.02	87	100	621.71	103	100	3,024.69	106	100	2,209.16