In general, the steroidal alkaloids represent an important class of alkaloids that essentially afford a close structural relationship to sterols i.e., they contain a perhydro-1, 2-cyclopentanophenanthrene nucleus. Interestingly, these group of alkaloids invariably occur in the plant kingdom as glycosidal combination with carbohydrate moieties.
The steroidal alkaloids may be broadly classified into two major groups, namely:
(a) Solanum Alkaloids, and
(b) Veratrum Alkaloids.
Hello S.Rasoul Hashemi
the steroidal alkaloids are derived biosynthetically from six isoprene units and could be classified as triterpenoids or steroids however they also contain nitrogen which giving them basic properties. steroidal alkaloids have been found in the plant families (apocynaceae, buxaceae , liliaceae , and solanaceae)
http://pubs.acs.org/doi/abs/10.1021/np500556t
https://www2.mcdaniel.edu/Biology/botf99/herbnew/alkaloids.htm
https://books.google.co.in/books?isbn=0444599568
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