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New horizons in microbiological food safety: Photodynamic Decontamination based on a curcumin derivative

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Abstract

Outbreaks of foodborne diseases are regularly reported worldwide. In particular, uncooked plant food is considered risky in terms of microbiological safety. Food is also the most important transmission route for resistant microorganisms from animals to humans. Photodynamic Decontamination (PDc) of foodstuff was recently introduced as a novel approach for increasing microbiological food safety. We investigated the efficiency of PDc on plant food with different geometries (flat, spherical and complex) using a two-dimensional LED array as a light source (435 nm, 33.8 J cm−2) and the cationic curcumin derivative SACUR-3 as a photosensitiser. A photoantibacterial effect (>3 log10 CFU reduction) was achieved on all flat substrates (slices of cucumber, tomato and lettuce) with 10 μM, 50 μM or 100 μM SACUR-3. The maximal photokilling with a relative inactivation of 5.6 log10 was measured on lettuce using 50 μM of the photoactive compound. Phototreatment of non-germinated fenugreek seeds and mung beans was successful if the spherical objects were rotated while under illumination (antibacterial effect at 100 μM SACUR-3). The decontamination of mung bean germlings with a more complex geometry using the PDc approach was ineffective with the two-dimensional light source. In conclusion, PDc based on the cationic curcumin derivative SACUR-3 is very effective at improving the microbiological safety of plant food with a flat or spherical geometry. More complex objects will require the development of novel illumination devices.

Graphical abstract: New horizons in microbiological food safety: Photodynamic Decontamination based on a curcumin derivative

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Publication details

The article was received on 09 May 2017, accepted on 05 Oct 2017 and first published on 06 Nov 2017


Article type: Paper
DOI: 10.1039/C7PP00165G
Citation: Photochem. Photobiol. Sci., 2017, Advance Article
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    New horizons in microbiological food safety: Photodynamic Decontamination based on a curcumin derivative

    M. Glueck, B. Schamberger, P. Eckl and K. Plaetzer, Photochem. Photobiol. Sci., 2017, Advance Article , DOI: 10.1039/C7PP00165G

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