Figure 3.

Identification of 8-nonenoic acid. (A) Comparative analysis of GC–MS retention times (RT) of ABp5 and authentic standard. 8-Nonenoic acid standard peak (light orange) with RT of ~14 min post-injection and the ABp5 peaks (red), released from the SPME, showing one peak at ~14 min post-injection with similar features (shape and slope) as the authentic standard. (B) Fractionation comparing the peak identified as 8-nonenoic acid secreted by ABp5 (red-line columns above axis) and the peak produced by the purchased authentic standard (blue-line columns below axis). The fractionations given by the GC–MS are identical for both.