Regresar

Characterization and feeding deterrent effects on the aphid, schizaphis graminum, of Some derivatives of the sweet compounds, stevioside and rebaudioside A

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 re-baudioside 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 antifeed-ant 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. © 1987, American Chemical Society. All rights reserved.