Thailand is widely known to have a rich flora with the populace making frequent use of unique vegetables or fruits for flavours, spices or condiments in their traditional cuisine. Furthermore, there are a large number of edible plants which are concurrently used as traditional folk medicines. It should also be noted that Thailand still has many species of vegetables almost never given to plant breeders51, giving rise to the possibility that they may contain some biologically active compounds not occurring in long-bred plants, or may surpass in the quantity of active phytochemicals. Thus, Thai edible plants, especially those eaten for purposes other than nutrition may be promising sources for biologically active compounds including anti-tumour promoters