Phytosterols classification

Brassinosteroids are grouped into C, Cg, and steroids like the typical phytosterols. These classifications result basically from different alkyl substitutions in the side chain, that is no substituent in steroids (14, 15 ), a methyl (1, 3,5, 7-9, 16-22,29) or an exomethylene ( 2,4, 6) at C24 in steroids, and an ethyl at C24 (12 )or an ethylidene at C24 ( 10,11, 13) or an exomethylene at C24 with a methyl at C25 ( 23-28 ) in steroids. The structure-activity relationship reveals that alkylation in the side chain is necessary for biological activity. More especially, the presence of a saturated alkyl ( a methyl or an ethyl ) at C24 and a methyl at C25 makes brassinosteroids biologically more active. Thus, 25-methylbrassinolide bearing both 24-methyl and 25-methyl functions has been chemically synthesized and it is more potent than brassinolide which, until now, had been considered to be the most potent brassinosteroid (44). 

In the past, different authors had different views on the classification of alcohols in tobacco and tobacco smoke. In onr catalog, we employ a system different from those used by our forerunners. In 1954, Kosak (2170), in his smoke component compilation, listed seven alcohols four alcohols (methanol, glycerol, diethylene glycol, and ethylene glycol) and three phenols (phenol, phenols, and catechol). He did not list either levoglucosan or a phytosterol as an alcohol but listed both as miscellaneous smoke components. In 1959, Johnstone and Plimmer (1971) listed thirteen alcohols plus five phytosterols identified in tobacco and/or smoke. 

The order Caryophyllales is composed of 12 families (Fig. 1) and was selected for a chemosystematic analysis of sterols based on early reports of 24-alkyl-A7-sterols in three families i.e. Spinacia (Chenopodiaceae), Lophocereus (Cactaceae) and Phytolacca (Phytolaccaceae) . Phytosterol structure and composition was analyzed with respect to each plant s taxonomic assignment. Isolation, identification methods, taxonomic classification, nomenclature systems and tribal arrangements are presented elsewhere only mature photosynthetic tissue was analyzed to avoid... 

Synonyms Glycine soja Glycine soya sterol Soy sterol Sterols, glycine soya Sterols, soy Sterols, soybean Classification Phytosterol... 

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