Bitter principle in cucurbits is due to

The bitter principle in cucurbits is due to Cucurbitacins.
The Cucurbitaceae family has the highest number of plant species which is cultivated by humans, in Cucurbitaceae possess some chemical substance that gives a bitter taste to the fruit, the chemical substance is cucurbitacin and it is chemically classified as triterpenes.
The cucurbitacins B and E are the main bitter principles in all seedlings. The biogenesis of the cucurbitacins, the taxonomy of the family and the genetics of bitterness are discussed in the light of these results.