十字花科蔬菜的保护作用，至少部分与异硫氰酸酯有关，异硫氰酸酯是一组在这些这些蔬菜中发现的能转化致癌物质植物组分。
The protective action of cruciferous vegetables is derived at least in part from isothiocyanates, a group of carcinogen-modulating phytochemicals found in these vegetables.
依据独立报的报道，该成分是涉及到癌症的主要物质，因为当与维生素c混合后，它转化成一种叫做苯的致癌物质。
The ingredient has been the subject of concern on cancer, because when mixed with Vitamin c, it turns into a carcinogenic substance called benzene, the Independent reported.
亚硝酸盐存在于人类的唾液和某些特定食物保护剂中，它们能转化为致癌物质亚硝胺。亚硝胺主要在酸性环境中形成，例如胃酸条件下。
Nitrosamines are formed in acidic conditions, such as those afforded by stomach acid, but vitamin C inhibits their formation, by converting nitrite to nitric oxide.
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