Commercial opportunities and research challenges in the high pressure processing of foods

Torres, J. Antonio; Velázquez, Gonzalo

doi:10.1016/j.jfoodeng.2004.05.066

Cited by 295 publications

(190 citation statements)

References 122 publications

(102 reference statements)

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“…Although the final concentrations are identical, our in situ observations clearly show that at 25 MPa, the fermentation of glucose is enhanced in yeast in comparison to controls at ambient pressure ( Figure 4). This enhanced activity has already been reported in yeast for non-specific esterases [33], for the reduction of sulfate by sediment bacteria [34] and for several enzyme complexes [35]. Our in situ data for the fermentation of glucose by yeast are congruent with the current biochemical data, which validates the use of quantitative Raman spectroscopy and the lowpressure DAC for the monitoring of microbial metabolism.…”

Section: Semi-quantitative Raman Spectroscopysupporting

confidence: 89%

“…As a result of the increase of pressure and temperature with depth (ca. 35 MPa/km and 30°C/km respectively), the deep subsurface may extend to 4 km below ground or more [7,8]. Even though subsurface microbes are very diluted, with estimation ranging from 10 2 to 10 4 , owing to the large volume they colonize, they may represent a substantial portion of Earth's overall total biomass.…”

Section: Introductionmentioning

confidence: 99%

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Development of a low-pressure diamond anvil cell and analytical tools to monitor microbial activities in situ under controlled P and T

Oger

Daniel

Picard

2006

Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics

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To cite this version:Philippe Oger, Isabelle Daniel, Aude Picard. Development of a low-pressure diamond anvil cell and analytical tools to monitor microbial activities in situ under controlled P and T. poger@ens-lyon.fr AbstractWe have designed a new low-pressure Diamond Anvil Cell (DAC), calibrated two novel pressure calibrants and validated the use of semi-quantitative Raman and Xray spectroscopies to monitor the fate of microbes, their metabolism or their cellular components under controlled pressures and temperatures in the 0.1-1.4 GPa and 20°-300°C P,T range. The lowpressure DAC has a 250-600 µm thick observation diamond window to allow for lower detection limits and improved microscopic imaging. This new design allows the determination of cellular growth parameters from automated image analysis, which can be correlated with the spectroscopic data obtained on metabolism, ensuring high quality data collection on microbial activity under pressure. The novel pressure sensors offer the ease of use of the well-known ruby scale, while being more sensitive and reacting to pressure variations instantaneously.

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Section: Semi-quantitative Raman Spectroscopysupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Development of a low-pressure diamond anvil cell and analytical tools to monitor microbial activities in situ under controlled P and T

Oger

Daniel

Picard

2006

Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics

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“…They are found in almost every branch of the industry. They can be found in the food, chemical, fuel, civil and military aviation industry, in medicine [1][2][3][4][5], and in others. They are also used in research and development works [6] as well as in diagnostics.…”

Section: Introductionmentioning

confidence: 99%

New Vision Sensor to Measure Gas Pressure

Murawski

2015

Measurement Science Review

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The paper presents the construction and operation of a video sensor developed for video-manometer. In the publication the use of video-manometer for measuring gas pressure is presented. A characteristic feature of the device is pressure measurement based on diaphragm deformation and digital image processing. Presented measuring technique eliminates restrictions in the construction of the measuring apparatus arising from non-linear nature of diaphragm deformation. It also allows performing measurements of gas pressure, also of explosive gas, providing galvanic isolation between the factor measured and the measuring device. The paper presents the results of video-manometer calibration and measurements taken during the laboratory tests. It has been shown that the developed video-manometer, that is equipped with a flat silicone diaphragm, allows measuring the gas pressure in the range of 0 -100 mbar with an error less than 2 %. In the experiments the CO2 pressure was measured.

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“…High hydrostatic pressure has been suggested as an alternative to conventional thermal preservation processes due to its ability to inactivate micro-organisms and enzymes while the quality attributes remain unchanged 24,46 . The effect of pressure on biopolymers, such as proteins and enzymes is related to reversible or irreversible changes of the native structure 7,14 .…”

Section: Introductionmentioning

confidence: 99%

Effect of High Hydrostatic Pressure-Temperature Combinations on the Activity of β-Glucanase from Barley Malt

Buckow¹,

Heinz²,

Knorr³

2005

Journal of the Institute of Brewing

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J. Inst. Brew. 111(3), 282-289, 2005␤-Glucanase from barley malt is known to be thermolabile but important in the mashing process. Therefore, the potential of increasing the thermostability of ␤-glucanase in ACES buffer (0.1 M, pH 5.6) by high hydrostatic pressure has been investtigated. Inactivation of the enzyme as well as changes of the conversion rate in response to combined pressure-temperature treatments in the range of 0.1-900 MPa and 30-75°C were assessed by analyzing the kinetic rate constants. A significant stabilization of ␤-glucanase against temperature-induced inactivation was detected at 400 MPa. With increasing pressure up to 600 MPa the catalytic activity of ␤-glucanase was progressively decelerated. However, for the overall depolymerization reaction of ␤-glucans in ACES buffer (0.1 M, pH 5.6) a maximum was identified at 215 MPa and 55°C yielding approximately 2 /3 higher degradation of ␤-glucan after 20 min as compared to the maximum at ambient pressure (45°C).

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Commercial opportunities and research challenges in the high pressure processing of foods

Cited by 295 publications

References 122 publications

Development of a low-pressure diamond anvil cell and analytical tools to monitor microbial activities in situ under controlled P and T

Development of a low-pressure diamond anvil cell and analytical tools to monitor microbial activities in situ under controlled P and T

New Vision Sensor to Measure Gas Pressure

Effect of High Hydrostatic Pressure-Temperature Combinations on the Activity of β-Glucanase from Barley Malt

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