Selected Parameters and Their Tested Levels for Sampling Secretion Using Compression in the Plunger of a Syringe.

<p>Selected Parameters and Their Tested Levels for Sampling Secretion Using Compression in the Plunger of a Syringe.</p

The response surface plot.

<p>The plot depicts the dependence of the sum of all the peaks (upper) (a.u., arbitrary units) and the number of peaks (bottom) on the temperature of SPME sorption and time of SPME sorption; irritation by compressing the true bugs with the plunger of a syringe; SPME sorption on a DVB/CAR/PDMS fiber; tempering time prior to compression 1 min; temperature prior to compression 40°C.</p

Optimum Conditions for the Method of Sampling Secretions Using Compression in the Plunger of a Syringe.

<p>Optimum Conditions for the Method of Sampling Secretions Using Compression in the Plunger of a Syringe.</p

Optimum Conditions for the Method of Sampling Secretions Using Ultrasonics and a Shaker.

<p>Optimum Conditions for the Method of Sampling Secretions Using Ultrasonics and a Shaker.</p

Dendrogram depicting the qualitative similarities in chemical profiles among the analysed sampled.

<p>The clustering was based on distance matrix, in which the distance between each pair of samples was expressed as a number of compounds exclusively present in one of the samples and absent in the other. All 135 detected compounds were considered, single linkage clustering algorithm was used for tree construction (for details, see Section <i>Comparison of secretions between true-bug species</i>).</p