Environmental Engineering Reference
In-Depth Information
steroids are classified into six types. They are (i) sterols isolated from the
unsaponifiable parts of animal and plant oils and fats, e.g. cholesterol and re-
lated compounds, vitamin D, methyl sterols, (ii) bile acids of the oldest known
steroid compounds, (iii) steroid hormones such as sex hormones, adrenal
steroids, calcium-regulating sterols and insect skin-shedding hormones, (iv)
sapogenins of plant glycosides that form a soapy foam in water, (v) steroid
alkaloids occurs in both plants and animals and (vi) steroid lactones in-
cluding the cardenolides, bufadienolides, holothurigenins, withanolides, and
antheridiols.
Scheme 11
