Table 2
Relative contents of the functional groups in the volatile compounds detected in orange and grapefruit

Functional group	Orange						Grapefruit
	Pulp			Peel			Pulp			Peel
	No.	Area%	mg/kg	No.	Area%	mg/kg	No.	Area%	mg/kg	No.	Area%	mg/kg
Alcohols	21	4.59	5.55	30	3.93	177.28	17	5.12	10.01	26	4.99	210.85
Aldehydes	18	8.15	9.86	18	3.93	177.32	18	6.74	13.17	22	5.43	229.07
Esters	19	15.43	18.60	18	0.69	30.96	13	9.64	18.84	28	6.14	259.21
Hydrocarbons	19	66.03	79.55	28	89.06	4016.31	16	63.69	124.46	27	74.46	3144.24
Ketones	10	3.00	3.61	5	0.30	13.45	10	2.77	5.42	6	2.74	115.73
Oxides	6	0.52	0.62	4	0.89	39.98	8	11.30	22.09	8	4.78	201.77
Acids	3	2.30	2.76	6	1.23	55.52	3	0.83	1.62	7	1.49	62.80
Total	96	100	120.55	109	100	4510.81	85	100	195.60	124	100	4223.68