Sequencing of cyclodepsipeptides (destruxins) using positive fast atom bombardment desorption tandem mass spectrometry.

The development of fast atom bombardment tandem mass spectrometry methodology is applied to the sequencing of the destruxin toxins (cyclodepsipeptides) which are 'wrong' cyclopeptides. The strategy is discussed in detail. Possible ways to overcome problems related to the resolution of isobaric fragment ions using deuterated compounds and the distinction between sequence and retrosequence are examined.

Induced mimicry of colony odors in ants.

The cuticular hydrocarbons ofFormica selysi (Formicinae) andMonica rubida (Myrmicinae) reared in single species and in mixed species colonies were determined using gas chromatography (GC) and GC-mass spectrometry. In colonies containing both species, each species modified its species-specific recognition odor. This odor is composed, at least partly, of cuticular hydrocarbons.

Direct in vitro and in vivo monitoring of destruxins metabolism in insects using internal surface reversed-phase high-performance liquid chromatography. I. Behaviour of E destruxin in locusts.

High-performance liquid chromatography with internal surface reversed-phase packing provides an analytical tool for studying the in vitro and in vivo metabolism of A and E destruxins in the haemolymph and various organs of male adults of Locusta migratoria. A slight amount of injected E destruxin is shown to be hydrated into E-diol destruxin in the haemolymph. The rest of the toxin is recovered unchanged in the fat-body, pericardial tissues and Malpighian tubules, and some further E-diol destruxin formation occurs in these organs.