最近由Graham等进行的对结肠癌、直肠癌患者的饮食习惯的流行病学研究结果说明,在其它饮食相同时,癌患者比非癌患者新鲜蔬菜消费量要低。他们考虑吲哚化合物可能是致癌的活性因子。Lai氏曾报告小麦的叶和根的水提取物在Ames试验中能选择性抑制需代谢激活的致癌物的致突变活性。最近的研究说明在蔬菜中叶绿素、维生素E和葫萝卜素均有对致突变物的抑制作用,而叶绿素是主要的因素。作者用Ames法对西红柿、黄瓜、芹菜、菠菜、莴苣叶、土豆、绿芥菜、葫萝卜、洋白菜,香菜,硬花甘兰,布鲁塞尔芽菜等蔬菜汁进行了 The recent epidemiological study of eating habits in colon and rectal cancer patients by Graham et al. Showed that cancer patients consumed less fresh vegetables than non-cancer patients at the same diet. They consider indole compounds may be carcinogenic active factor. Lai’s water and leaf extracts of wheat have been reported to selectively inhibit the mutagenic activity of metabolically-activated carcinogens in the Ames test. Recent research shows that chlorophyll, vitamin E and carotenoids in vegetables have mutagenic effects, and chlorophyll is the main factor. The authors used the Ames method for vegetable juices such as tomatoes, cucumbers, celery, spinach, lettuce leaves, potatoes, green mustard, carrot, cabbage, parsley, broccoli, Brussels sprouts