Chemical composition of onion ( nutritive value per 100 g of onion )

Particulars	Big  onion 1	Small  onion 1	Onion  stalks 1	Dehydrated  onion 2
Moisture (g)	86.60	84.30	87.60	4.60
Protein (g)	01.20	1.80	0.90	10.60
Fat (g)	0.10	0.10	0.20	0.80
Minerals (g)	0.40	0.60	0.80	3.50
Fibre (g)	0.60	0.60	1.60	6.40
Carbohydrate (g)	11.10	12.60	8.90	74.10
Energy ( K cal )	50.00	59.00	41.00	-------
Calcium (mg)	46.90	40.00	50.00	300.00
Phosphorus (mg)	50.00	60.00	50.00	290.00
Iron (mg)	0.60	1.20	7.43	2.00
Carotene (ug)	-----	15.00	595.00	-----
Thiamin (mg)	0.08	0.08	-----	0.42
Riboflavin (mg)	0.01	0.02	0.03	0.06
Niacin (mg)	0.40	0.50	0.30	-----
Folic acid ( total ) (mg)	6.00	-----	-----	-----
Vitamin C  (mg)	11.00	2.00	17.00	147.00
Magnesium (mg)	16.00	-----	104.00	-----
Sodium (mg)	4.00	-----	2.20	40.00
Potassium (mg)	127.00	-----	109.00	1000.00
Copper (mg)	0.18	-----	0.45	-----
Manganese (mg)	0.18	-----	0.74	-----
Molybdenum  (mg)	0.03	-----	2.29	-----
Zinc (mg)	0.41	-----	-----	-----

Source : 1, Nutritive Value of Indian Foods, NIN, Hyderabad ; 2, CFTRI, Mysore.