2-hexenal--z-isomer and sorbitan-monooleate

Starch suspensions were crosslinked with trisodium citrate for either 0 or 17h, gelled and then freeze-dried to corresponding aerogels. The aerogel from the 17h-crosslinked suspension was loaded with the antifungal compound, trans-2-hexenal, and coated with the surfactant, sorbitan monooleate. Aerogel hardness was increased by the citrate-mediated crosslinking, whereas its adhesiveness decreased. Starch gelation decreased the crystallinity index (CrI) from 59% to ≈23%; however, the pre-gelation crosslinking resulted in a higher CrI value (i.e. ≈38%) for the aerogel. The voids at the internal microstructure of the 17h-crosslinked aerogel were more uniform and coating with surfactant closed the surface openings. The latter accordingly resulted in a more sustained release of the volatile, trans-2-hexenal, from the crosslinked starch aerogel and led to slower lethality of Aspergillus parasiticus cells inoculated on pistachio nuts compared with the non-coated condition.

Topics: Aldehydes; Antifungal Agents; Aspergillus; Citrates; Coated Materials, Biocompatible; Feasibility Studies; Food Contamination; Food Microbiology; Freeze Drying; Gels; Hexoses; Microbial Viability; Nuts; Pistacia; Starch; Surface-Active Agents; Volatile Organic Compounds