Dr. Banta,
You may wish to look at the following:
Fenwick GR. Hanley AB.
The genus Allium. Part 2. [Review] [1060 refs]
Critical Reviews in Food Science & Nutrition. 22(4):273-377, 1985.
The genus Allium--Part 3. [Review] [999 refs]
Critical Reviews in Food Science & Nutrition. 23(1):1-73, 1985.
Kojima T. Tanaka T. Mori H. Kato Y. Nakamura M.
Acute and subacute toxicity tests of onion coat, natural colorant
extracted from onion (Allium cepa L.), in (C57BL/6 x C3H)F1 mice.
Journal of Toxicology & Environmental Health. 38(1):89-101, 1993 Jan.
Cheers
Karl
