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Analysis of pigments from integument of Graphosoma semipunctatum.
Krajíček, Jan ; Svobodová, Eva (referee) ; Bosáková, Zuzana (advisor)
Pterines belong to an important group of compounds, acting as pigments in many species. Some of them are probably responsible for characteristic coloration of the insect group (Hereroptera). This coloration is considered to be a visual warning signal for optically orientating predators (birds, lizards etc.). In this work, pterines in the species of Graphosoma semipunctatum have been investigated by high performance liquid chromatography. To develope an appropriate separation method, the reverse-phase separation mode with C18 stationary phase (Spherisorb ODS 2) and binary mobile phase (organic modifier/buffer or water) was used. The effect of type and content of organic modifiers (methanol, ethanol, tetrahydrofuran) and concentration of phosphate buffer pH 3.0 (10 - 30 mM) in the mobile phases on retention and separation behavior of the studied pterines (leukopterin, biopterin, xanthopterin, isoxanthopterin and erythropterin) was studied. Under the optimized separation conditions (5/95 (v/v) methanol/20 mM phosphate buffer, pH 3.0, flow rate 0.7 ml.min-1 , UV detection at 290 nm), the extract from the integument of Graphosoma semipunctatum was analyzed.
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