title: Effect of supercritical carbon dioxide pasteurization on natural microbiota, texture, and microstructure of fresh-cut coconut.
abstract: The objective of the present study was the evaluation of the effectiveness of supercritical carbon dioxide (SC-CO(2)) as a nonthermal technology for the pasteurization of fresh-cut coconut, as an example of ready-to-eat and minimally processed food. First, the inactivation kinetics of microbiota on coconut were determined using SC-CO(2) treatments (pressures at 8 and 12 MPa, temperatures from 24 to 45 °C, treatment times from 5 to 60 min). Second, the effects of SC-CO(2) on the hardness and microstructure of fresh-cut coconut processed at the optimal conditions for microbial reduction were investigated. SC-CO(2) treatment of 15 min at 45 °C and 12 MPa induced 4 log CFU/g reductions of mesophilic microorganisms, lactic acid bacteria, total coliforms, and yeasts and molds. The hardness of coconut was not affected by the treatment but the samples developed an irregular and disorderly microstructure. Results suggested the potential of SC-CO(2) in preserving fresh-cut fruits and ready-to-eat products.
authors.affiliation: Dept. of Materials Engineering and Industrial Technologies, Univ. of Trento, via Mesiano 77, I-38123 Trento, Italy. giovanna.ferrentino@ing.unitn.it
authors.forename: Giovanna
authors.initials: G
authors.lastname: Ferrentino
authors.forename: Sara
authors.initials: S
authors.lastname: Balzan
authors.forename: Andrea
authors.initials: A
authors.lastname: Dorigato
authors.forename: Alessandro
authors.initials: A
authors.lastname: Pegoretti
authors.forename: Sara
authors.initials: S
authors.lastname: Spilimbergo
mesh_terms: D002245:Carbon Dioxide / Q000494:pharmacology*; D003059:Cocos / Q000737:chemistry*; D015169:Colony Count, Microbial; D005506:Food Contamination / Q000517:prevention & control; D005511:Food Handling / Q000379:methods; D005516:Food Microbiology; D005519:Food Preservation / Q000379:methods; D005638:Fruit / Q000737:chemistry / Q000382:microbiology; D007091:Image Processing, Computer-Assisted; D054892:Metagenome / Q000187:drug effects*; D008855:Microscopy, Electron, Scanning / Q000379:methods; D061352:Pasteurization / Q000379:methods*; D011312:Pressure; D013696:Temperature
chemical_list: D002245:Carbon Dioxide