Table 2 Relative contents of the functional groups in the volatile compounds detected in Jeju citrus fruits

Functional group	Cheonhyehyang			Hallabong			Jinjihyang			Hwanggeumhyang			Redhyang
	NO.	Area%	mg/kg	NO.	Area%	mg/kg	NO.	Area%	mg/kg	NO.	Area%	mg/kg	NO.	Area%	mg/kg
	Alcohols	24	18.94	935.79	23	3.92	128.89	22	3.95	130.97	25	6.18	265.37	26	8.57	347.17
Aldehydes	25	11.55	570.62	22	8.18	268.69	25	8.88	294.73	22	7.88	338.33	24	13.20	534.57
Esters	15	2.46	121.76	9	2.55	83.76	9	3.32	110.05	13	2.57	110.28	10	0.66	26.57
Hydrocarbons	25	61.04	3,015.36	29	82.43	2,708.96	35	81.10	2,690.42	29	79.79	3,425.66	36	75.67	3,064.68
Ketones	5	0.94	46.65	5	0.95	31.21	6	0.36	12.01	4	1.69	72.68	4	0.41	16.56
Oxides	4	2.70	133.35	3	1.03	34.00	2	0.73	24.17	4	1.27	54.70	4	0.64	25.92
Acids	6	2.35	116.24	6	0.94	30.87	6	1.66	55.20	5	0.61	26.36	4	0.85	34.47
Total	104	100	4,939.77	97	100	3,286.38	105	100	3,317.56	102	100	4,293.39	108	100	4,049.94