title: Modelling the impact of water activity and fat content of dry-cured ham on the reduction of Salmonella enterica by high pressure processing.
abstract: This work aimed to quantify the impact of awand fat content of dry-cured ham on the Log reduction of Salmonella enterica by high pressure (HP). Dry-cured ham with adjusted aw(0.86-0.96) and fat content (10-50%) was inoculated with S. enterica and pressurised (347-852MPa, 5min/15°C), following a Central Composite Design. Polynomial regression indicated a significant impact of pressure and awon S. enterica HP-lethality. By lowering awa clear piezoprotection was observed. At low aw(0.88) the S. enterica reduction was little affected by increasing pressure (e.g. 2.3 to 3.2 Logs at 450 to 750MPa, respectively). At the highest awthe estimated inactivation ranged from 3.3 to 8.9 Logs at 450 to 750MPa, respectively. No significant piezoprotective effect on S. enterica was recorded by the fat content. The relevance of food characteristics on the HP-lethality of S. enterica indicate the need to validate the HP effectiveness on the specific product.
authors.affiliation: IRTA, Food Safety Programme - Finca Camps i Armet, E-17121 Monells, Spain. Electronic address: sara.bovercid@irta.cat.
authors.forename: S
authors.initials: S
authors.lastname: Bover-Cid
authors.affiliation: IRTA, Food Safety Programme - Finca Camps i Armet, E-17121 Monells, Spain.
authors.forename: N
authors.initials: N
authors.lastname: Belletti
authors.affiliation: IRTA, Food Safety Programme - Finca Camps i Armet, E-17121 Monells, Spain.
authors.forename: T
authors.initials: T
authors.lastname: Aymerich
authors.affiliation: IRTA, Food Safety Programme - Finca Camps i Armet, E-17121 Monells, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Garriga
mesh_terms: D000273:Adipose Tissue; D000818:Animals; D003257:Consumer Product Safety; D005506:Food Contamination / Q000517:prevention & control*; D005511:Food Handling; D005516:Food Microbiology; D006863:Hydrogen-Ion Concentration; D008461:Meat Products / Q000382:microbiology*; D008962:Models, Theoretical; D011312:Pressure; D019779:Salmonella enterica / Q000302:isolation & purification; D013552:Swine; D014867:Water / Q000032:analysis*
chemical_list: D014867:Water
keywords: Food safety; Foodborne pathogen; High hydrostatic pressure; Microbial inactivation; Piezoresistance; RTE meat products