2.6.2. HHP and bioactive coating
Coated or uncoated green bean samples (2.0
102 to
2.2
102 kg each), inoculated with L. innocua, were sealed in
flexible pouches made of multilayer polymer/aluminum/polymer
film (Polyethylene–Aluminum–Polypropylene) under vacuum
before each test. A bench-top vacuum packaging unit, equipped
with a vacuum pump (25 m3/h) and a sealing bar of 0.50 m, was
used to pack the samples at a
final vacuum level of 97%.
The experiments were carried out in a High Pressure pilot
plant MINI Foodlab FPG5620 (Stansted Fluid Power Ltd., UK). The
apparatus, with an internal volume capacity of 0.5 L, was operated
with a mixture of ethanol and castor oil. Being the system
completely adiabatic, a temperature increase rate of 4 C/100 MPa
was recorded during operation. Experiments were carried out for
5 min at a pressure level comprised between 200 and 400 MPa at
25
1 C. The pressurization rate of the HHP unit was set at
10 MPa/s, with the come up times ranging between 20 and 40 s,
depending on pressure. The decompression rate was instead set at
2.6.2. HHP and bioactive coatingCoated or uncoated green bean samples (2.0102 to2.2102 kg each), inoculated with L. innocua, were sealed inflexible pouches made of multilayer polymer/aluminum/polymerfilm (Polyethylene–Aluminum–Polypropylene) under vacuumbefore each test. A bench-top vacuum packaging unit, equippedwith a vacuum pump (25 m3/h) and a sealing bar of 0.50 m, wasused to pack the samples at afinal vacuum level of 97%.The experiments were carried out in a High Pressure pilotplant MINI Foodlab FPG5620 (Stansted Fluid Power Ltd., UK). Theapparatus, with an internal volume capacity of 0.5 L, was operatedwith a mixture of ethanol and castor oil. Being the systemcompletely adiabatic, a temperature increase rate of 4 C/100 MPawas recorded during operation. Experiments were carried out for5 min at a pressure level comprised between 200 and 400 MPa at251 C. The pressurization rate of the HHP unit was set at10 MPa/s, with the come up times ranging between 20 and 40 s,depending on pressure. The decompression rate was instead set at
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