Figure 1.

HPLC profile of volicitin (A) and other fatty acid derivatives detected in the oral secretions of beet armyworms at a wavelength of 200 nm. Compounds and approximate retention times include: (A) N-(17-hydroxylinolenoyl)-l-glutamine, 7.5 min; (a) N-(17-hydroxylinoleoyl)-l-glutamine, 8.0 min; (B) 17-hydroxy linolenic acid, 11.1 min; (C) N-linolenoyl-l-glutamine, 11.9 min; (b) 17-hydroxy linoleic acid, 12 min; (IS) N-palmitoleoyl-l-glutamine (internal standard), 12.3 min; (c) N-linoleoyl-l-glutamine, 12.6 min; (D) linolenic acid, 15.2 min; (d) linoleic acid, 16.2 min; (E) unknown, 16.6 min; (d̄) oleic acid, 17.1 min; and (F) impurity, 17.8 min.