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洋葱不仅具有较为丰富的营养价值,而且颇具药用价值。据测定每百克洋葱的可食部分中,含蛋白质1.8克、碳水化合物8克、粗纤维1.1克、钙40毫克、磷50毫克、铁1.8毫克、硫胺素0.03毫克、核黄素0.02毫克、尼克酸0.2毫克和抗坏血酸8毫克等。洋葱的鳞茎中因含有环蒜氨酸(Cycloalliin)的前体物质S-丙烯基L-半胱氨酸硫氧化物,
Onions not only have a rich nutritional value, but also quite medicinal value. According to the determination of edible parts per 100 grams of onions containing 1.8 grams of protein, carbohydrates 8 grams, 1.1 grams of crude fiber, calcium 40 mg, phosphorus 50 mg, iron 1.8 mg, 0.03 mg of thiamine, riboflavin 0.02 mg 0.2 mg of nicotinic acid and 8 mg of ascorbic acid. Onion bulbs contain a precursor of cycloallinin S-propenyl L-cysteine sulfur oxides,