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  • Title: Characterization and feeding deterrent effects on the aphid, Schizaphis graminum, of some derivatives of the sweet compounds, stevioside and rebaudioside A.
    Author: Nanayakkara NP, Klocke JA, Compadre CM, Hussain RA, Pezzuto JM, Kinghorn AD.
    Journal: J Nat Prod; 1987; 50(3):434-41. PubMed ID: 3668559.
    Abstract:
    The intensely sweet compounds, stevioside [1] and rebaudioside A [2], and 15 of their derivatives, were tested for feeding deterrent activity against the aphid, Schizaphis graminum. Included with these compounds was steviol [4], the aglycone of stevioside and rebaudioside A that was one of the most active compounds in this investigation. Loss of feeding deterrent activity of steviol was observed on acetylation or glycosylation of the C-13 tertiary hydroxy group or on methylation of the C-19 carboxylic acid substituent. In contrast, the antifeedant activity of steviol was not greatly affected by modification of either the C-16 exomethylene group or the C/D-ring junction stereochemistry. 13C-nmr data have been obtained for 12 of the test compounds investigated.
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