Source: © 2023 Morgane Mauduit et al

The I-Smel device can concentrate sponge exometabolites from 10 litres of water in just 10 minutes sampling time

A hand-held submersible device that traps dissolved compounds produced by marine organisms could provide important insights into marine chemical ecology and boost drug discovery efforts by identifying previously unknown natural product molecules.

The In Situ Marine Molecule Logger (I-Smel), developed by researchers at Aix Marseille University, France, was deployed by a scuba diver at a depth of 15–20 metres in the Mediterranean Sea – an ecosystem dominated by sponges, which are prolific producers of specialised metabolites termed exometabolites (EMs).

The researchers focused on three common species of large sponge (Aplysina cavernicola, Spongia officinalis, and Agelas oroides), and carried out three types of underwater experiment to capture and concentrate the EMs. The extracts were then analysed and their components identified back at the laboratory.


Source: © 2023 Morgane Mauduit et al

The three sponge types that were analysed using the I-Smel instrument

The diversity and proportion of recovered EMs, including brominated alkaloids and furanoterpenoids, were found to greatly differ between species and even between biological replicates of the same species. The researchers said the findings confirmed that I-Smel could be used as a non-invasive technique to provide ‘crucial insights’ into the ‘structuration of chemical mediation that underpins ecological interactions’.


Source: © 2023 Morgane Mauduit et al

The French research team detected a diverse array of compounds that were collected during the underwater sampling sessions

The team notes that the I-Smel device ‘opens new research perspectives in marine chemical ecology and sets the stage for further sustainable efforts in natural product chemistry’.