Determination of thermophysical properties of foods under high hydrostatic pressure in combined experimental and theoretical approach

2005 ◽  
Vol 6 (3) ◽  
pp. 318-326 ◽  
Author(s):  
W. Kowalczyk ◽  
C. Hartmann ◽  
C. Luscher ◽  
M. Pohl ◽  
A. Delgado ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Theoretical Approach ◽  
Thermophysical Properties ◽  
High Hydrostatic Pressure

Determination of Silkworm Silk Fibroin Compressibility Using High Hydrostatic Pressure with in Situ X-ray Microdiffraction

2014 ◽  
Vol 47 (20) ◽  
pp. 7187-7193 ◽  
Author(s):  
Christina Krywka ◽  
Igor Krasnov ◽  
Roxana Figuli ◽  
Manfred Burghammer ◽  
Martin Müller
Keyword(s):  
Hydrostatic Pressure ◽  
Silk Fibroin ◽  
High Hydrostatic Pressure ◽  
X Ray ◽  
Silkworm Silk

scholarly journals Reduction of Listeria innocua contamination in vacuum-packaged dry-cured Italian pork products after high hydrostatic pressure treatment

2015 ◽  
Vol 4 (2) ◽  
Author(s):  
Giuseppe Merialdi ◽  
Mattia Ramini ◽  
Emanuela Ravanetti ◽  
Giorgio Gherri ◽  
Paolo Bonilauri
Keyword(s):  
Hydrostatic Pressure ◽  
High Hydrostatic Pressure ◽  
Culture Broth ◽  
Listeria Innocua ◽  
Treatment Groups ◽  
Pork Products ◽  
High Hydrostatic Pressure Treatment ◽  
The Difference ◽  
Single Batch

The present work aims to present the results of the application of a treatment with high hydrostatic pressure (HHP) on Italian fermented and dry-cured pork products. The products used in this study were portioned cured ham, portioned bacon and salami, vacuumpackaged and produced by a single processing company. Two studies were conducted on a single batch of the three products by means of an artificial contamination with <em>Listeria innocua</em> as a surrogate of <em>L. monocytogenes</em>. In the first trial a superficial contamination was obtained by immersion for 3 min in the culture broth with a concentration of approximately 9 log cfu/mL. At the end of the inoculum step, the pieces were dred at room temperature and vacuum packaged. In the second trial 50 kg of minced pork meat were contaminated before production of salami. In both cases the inoculum contained 5 strains of <em>L. innocua</em>. Subsequently, in both trials, 10 samples were randomly divided into two groups of 5 pieces each: i) TH group, samples treated with HHP; ii) group C, control samples, not subjected to any treatment. All samples were stored at refrigeration temperature at the end of HHP treatments (if applied), and analyzed for the determination of the surface (1st trial) and deep (2nd trial) quantitative contamination of <em>L. innocua</em>. pH and aW were also determined on 3 pieces of each products belonging to group C. The difference between the medians of the log cfu/cm<sup>2</sup> or g established between controls and treated were compared using the non-parametric test (Kruskal-Wallis test) with P&lt;0.01. In all products and in both trials the level of contamination detected in treatment groups was always significantly lower than in controls (P&lt;0.01). In particular, in vacuum-packaged ham, bacon and salami viability logarithmic viability reductions equal to -2.29, -2.54 and -2.51 were observed, respectively. This study aimed to evaluate a not-thermal treatment on Italian cured or fermented pork products. The results of this study need to be confirmed in different products and in a greater number of lots, but they appear promising, also because of the considerable literature available for different categories of products (cheese, vegetables and fruit).

Determination of the coefficient of friction between metal and diamond under high hydrostatic pressure

2004 ◽  
Vol 85 (22) ◽  
pp. 5188-5190 ◽  
Author(s):  
J. C. Crowhurst ◽  
I. M. Darnell ◽  
A. F. Goncharov ◽  
D. H. Lassila ◽  
J. M. Zaug
Keyword(s):  
Hydrostatic Pressure ◽  
Coefficient Of Friction ◽  
High Hydrostatic Pressure ◽  
The Coefficient Of Friction

Determination of the transport properties of composite fermions under high hydrostatic pressure

1995 ◽  
Vol 56 (3-4) ◽  
pp. 459-462
Author(s):  
S. Holmes ◽  
D.K. Maude ◽  
M.L. Williams ◽  
J.J. Harris ◽  
J.C. Portal ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Transport Properties ◽  
High Hydrostatic Pressure ◽  
Composite Fermions

Survival of mouse blastocysts after low-temperature preservation under high pressure

2004 ◽  
Vol 52 (4) ◽  
pp. 479-487 ◽  
Author(s):  
Cs. Pribenszky ◽  
M. Molnár ◽  
S. Cseh ◽  
L. Solti
Keyword(s):  
Phase Transition ◽  
Hydrostatic Pressure ◽  
Low Temperature ◽  
High Hydrostatic Pressure ◽  
Room Temperature ◽  
Freezing Point ◽  
Significant Loss ◽  
Embryo Cryopreservation ◽  
Subzero Temperatures ◽  
Survival Capacity

Cryoinjuries are almost inevitable during the freezing of embryos. The present study examines the possibility of using high hydrostatic pressure to reduce substantially the freezing point of the embryo-holding solution, in order to preserve embryos at subzero temperatures, thus avoiding all the disadvantages of freezing. The pressure of 210 MPa lowers the phase transition temperature of water to -21°C. According to the results of this study, embryos can survive in high hydrostatic pressure environment at room temperature; the time embryos spend under pressure without significant loss in their survival could be lengthened by gradual decompression. Pressurisation at 0°C significantly reduced the survival capacity of the embryos; gradual decompression had no beneficial effect on survival at that stage. Based on the findings, the use of the phenomena is not applicable in this form, since pressure and low temperature together proved to be lethal to the embryos in these experiments. The application of hydrostatic pressure in embryo cryopreservation requires more detailed research, although the experience gained in this study can be applied usefully in different circumstances.

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