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Development of biobased emulsions for postharvest citrus fruit preservation

Abstract : Penicillium digitatum is the causal agent for citrus green mold which generates 90% of post-harvest losses in Mediterranean countries. The use of a green seaweed extract to fight this fungal pathogen could represent an ecofriendly alternative to chemical fungicides. We propose to formulate an aqueous extract from Ulva lactuca (8.3%) in an emulsion for the preventive treatment of oranges. New biobased emulsifiers, alkyl aconitates, were synthesized according to a green process and were characterized by their hydrophilic and lipophilic balance (HLB) and their critical micelle concentration (CMC). These mono-, di and tri-dodecyl aconitates (8%) were effective in stabilizing an oil-in-water emulsion including the natural U. lactuca extract. The viscosities of resulting emulsions helped to form a film on the orange surface. Several in vitro microbiological tests towards Penicillium digitatum showed interesting anti-fungal activities for the new ingredients, as well as for the resulting emulsions. In-vivo tests also confirmed that mono-, di- and tri-docedyl aconitates could contribute to limit the development of P. digitatum on peel surface. Thus, the compositions of two ecofriendly emulsions combining a natural extract and a biobased emulsifier seem adapted to improve oranges preservation.
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https://hal.inrae.fr/hal-03506063
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Submitted on : Saturday, January 1, 2022 - 4:47:53 PM
Last modification on : Tuesday, March 22, 2022 - 8:45:53 AM

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Douaa Salim, Pascale de Caro, Xavier Chasseray, Alain Shum Cheong Sing. Development of biobased emulsions for postharvest citrus fruit preservation. Sustainable Chemistry and Pharmacy, ELSEVIER, 2022, 25, pp.100583. ⟨10.1016/j.scp.2021.100583⟩. ⟨hal-03506063⟩

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