A Study of Dehydration of Fish Using Successive Pressure Drops (DDS) and Controlled Instantaneous Pressure Drop (DIC)

Haddad, Joseph; Juhel, Frédéric; Louka, Nicolas; Allaf, Karim

doi:10.1081/drt-120029993

Cited by 15 publications

(9 citation statements)

References 6 publications

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“…[25,26] Instantaneous controlled pressure drop (DIC) treatment is defined as a texturing process developed in the late 1980s to early 1990s. [27][28][29] This technique is based on the thermomechanical effect obtained by abruptly dropping steam pressure toward a vacuum. Such a treatment may imply an expansion of product due to mechanical stress caused by steam generated by autovaporization within the product.…”

Section: Impact Of Instant Controlled Pressure Drop Treatment On Moismentioning

confidence: 99%

Impact of Instant Controlled Pressure Drop Treatment on Moisture Adsorption Isotherm of Cork Granules

2009

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Some special thermal and mechanical treatments may completely modify the composition, and the structure of organic material changes its interaction with water. In the case of the instant controlled pressure drop (DIC) technique, the main modification, which is structure expansion and high porosity, allows the product to generally reduce moisture activity. In the special case of cork granules, the impact of DIC in terms of porosity is completely absent and expansion is linked to a tear effect obtained from only the large size granules. In order to characterize this type of treatment, we considered natural and DIC-treated cork granules and determined moisture adsorption isotherms at three different temperatures (25, 40, and 60 C) and different water activity levels ranging from 0.05 to 0.9 using the static gravimetric method. We used three samples of the same cork variety with 0.5-1 mm, 2-4 mm, and 4-6 mm as granule diameter. The adsorption isotherms of both natural untreated and DIC-treated cork whatever granules display a sigmoid form type II isotherm, with equilibrium moisture contents at constant water activity decreasing when temperature increases. The impact of DIC treatment depends of cork shape; the larger the shape, the lower the water activity for the same water content. Such a result is linked to the modification of structure. Thus, for the smallest shape, DIC implying only low thermal effect without any structure modification allows cork to lightly increase its water activity compared to the untreated samples. With higher shape cork granules, as DIC treatment induces a tear effect and some expansion, activity of water is lower for the same water content. For describing the experimental data of adsorption isotherms, we used GAB, BET, and Henderson models. We found the GAB to be the most suitable model with predicted values higher than those obtained using the BET model. We note that monolayer moisture content values increase in the case of big shape cork granules after having been treated by DIC.

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Section: Impact Of Instant Controlled Pressure Drop Treatment On Moismentioning

confidence: 99%

Impact of Instant Controlled Pressure Drop Treatment on Moisture Adsorption Isotherm of Cork Granules

2009

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“…[6,7] A recent study has been conducted on employing pressure-swing systems (successive pressure drops and controlled instantaneous pressure drop) to dehydrate salmon (Salmo salar) and the white tuna (Thunnus albacore), which represented fatty and semi-fatty fish, respectively. [8] Experimental results have indicated that these drying systems proved to be much more satisfactory than standard drying methods for improving the functional and quality aspects of the end product while limiting as much as possible the operating cost. It is worthwhile mentioning that the idea of applying a similar system for partial dehydration of acellular porcine dermal tissue was derived from this work, [8] particularly when porcine dermal tissue is known to contain substantial amount of lipids.…”

Section: Introductionmentioning

confidence: 96%

“…[8] Experimental results have indicated that these drying systems proved to be much more satisfactory than standard drying methods for improving the functional and quality aspects of the end product while limiting as much as possible the operating cost. It is worthwhile mentioning that the idea of applying a similar system for partial dehydration of acellular porcine dermal tissue was derived from this work, [8] particularly when porcine dermal tissue is known to contain substantial amount of lipids.…”

Section: Introductionmentioning

confidence: 96%

Drying of Porcine Dermal Tissue Via Pressure Swing Adsorption

Chou¹,

Chua²,

Teoh³

et al. 2006

Drying Technology

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“…This also increases the specific surface area and reduces the diffusion resistance there by increasing the drying rate in final stages. However, in a successive decompression DDS process, a thermo-sensitive product undergoes a series of cycles, during which it is placed at a certain pressure for a defined time and then subjected to an instantaneous decompression in a vacuum (Maache-Rezzoug et al 2002;Haddad et al 2004). The product is maintained under a vacuum for a defined time before the following cycle begins.…”

Section: Variable Pressure Drop Dryingmentioning

confidence: 99%