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A class of unique sucrose esters that comprise the greater portion of non-volatile constituents in the exudate from type B glandular trichomes of S. neocardenasii Hawkes & Hjerting (PI 498129) were resolved by reversed phase t.l.c. The major components were characterized by a combination of hydrolysis studies and spectroscopic techniques as 2-O-acetyl-3′-O-hexanoyl-3,4-di-O-isobutyryl-sucrose, 2-O-acetyl-3′,4-di-O-hexanoyl-3-O-isobutyrylsucrose, and 2-O-acetyl-3′-O-decanoyl-3,4-di-O-isobutyrylsucrose.

A series of polar, high-molecular-weight compounds that comprise the major portion of nonvolatile constituents in the exudate from type B glandular trichomes of S. berthaultii Hawkes (PI 265857) were isolated by silica gel t.l.c. and identified by spectroscopic and chemical means as a complex of 3,3′,4,6-tetra- O -acylated sucrose esters. Two of the principal sucrose esters were resolved by reversed-phase t.l.c. and characterized as 6- O -capryl-3,3′,4-tri- O -isobutyrylsucrose and 6- O -capryl-3′- O -isobutyryl-3,4-di- O -(2-methylbutyryl)sucrose.