Team:UNITN-Trento/Project/Methyl Salicylate

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Results - Methyl Salicylate

It was difficult to find a volatile molecule that could be enzymatically produced by a bacterium and also demonstrated to be an efficient ripening inhbitor. There were not many candidates to choose from and after a long search we chose methyl salicylate (MeSA). Previous publications suggested that MeSA could inhibit the ripening of either kiwifruit and tomatoes, at a concentration of 0.5 mM

Fortunately many of the needed parts were already available because of the work of the MIT iGEM 2006 team (Eau de Coli).

< img id="mesapath" style=" margin-bottom: 1em;" src="http://2013.igem.org/wiki/images/d/dd/Tn-2013_MeSA_path.jpg" />

We modified and improved these parts and resubmitted them to the registry, as they were not available in pSB1C3.

MeSA detection

To have a quantitative analysis we used a Finnigan Trace GC ULTRA with a flame ionization detector (FID) that allowed us to detect ions formed during MeSA combustion in a hydrogen flame. The generation of this ions is proportional to MeSA concentration in the sample stream. A calibration curve was initially created using samples with a well known pure MeSA concentration (0 mM, 0.2 mM, 0.5 mM, 1.0 mM, 2 mM).