Aroma Recovery and Retention in Concentration and Drying of Foods

Bomben, J. L.; Bruin, S.; Thijssen, H.A.C.; Merson, R. L.

doi:10.1016/s0065-2628(08)60191-3

Cited by 85 publications

(62 citation statements)

References 70 publications

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“…4 However, it is known that high-boiling compounds are particularly volatile in dilute aqueous system because their weak vapour pressure are compensated by a relative high activity coefficient. 30 After the drying process, the carvacrol losses from the SPI coated papers were calculated by subtracting the initial calculated carvacrol deposited on coated papers (g/m 2 ) from the extracted carvacrol quantity (g/m 2 ) remaining on dried coated papers. Carvacrol losses appeared to be highly dependant on time/ temperature couples applied during drying and varied from 25 to 55% (Fig.…”

Section: Resultsmentioning

confidence: 99%

Carvacrol losses from soy protein coated papers as a function of drying conditions

Chalier

Arfa

Preziosi-Belloy³

et al. 2007

J of Applied Polymer Sci

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The influence of drying conditions (temperature/time) on carvacrol losses was investigated for antimicrobial packaging obtained by coating paper with soy protein solutions containing 30% of carvacrol (w/w of SPI) as antimicrobial agent. The lowest carvacrol losses ranging from 25 to 30% were obtained for three drying conditions: high temperature and short time 2508C for 20 s or mild conditions 508C for 210 s and 258C for 3 h. In contrast, intermediate drying conditions (1008C/90 s and 1508C/45 s) led to carvacrol losses higher than 50%. The weaker losses observed for drying at 2508C compared with the intermediate temperatures could be explained by the rapid formation of a thick and protective crust that acted as a selective membrane letting to past water and retaining carvacrol. For drying at 1508C, high losses were related to water vaporization and carvacrol carrying as attested by the presence of holes observed by SEM and due to bubble formation and bursting. If drying conditions affected the carvacrol losses and its retention from coated papers during storage at 308C and 60% relative humidity, the antimicrobial activity was found only dependent on carvacrol amount of the coated papers.

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Section: Resultsmentioning

confidence: 99%

Carvacrol losses from soy protein coated papers as a function of drying conditions

Chalier

Arfa

Preziosi-Belloy³

et al. 2007

J of Applied Polymer Sci

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“…Presumably, it is under these conditions that the reduction systems of the cell are inoperative but oxygen radical activity is highest. With further dehydration, molecular diffusion rates decline (2) so that the conversion of ACP-SH to ACP-S-S-G through the interaction of ACP with glutathione or free radicals becomes negligible. This is consistent with the observation that over a period of several months, no change in levels of ACP-SH and ACP-S-S-G could be detected in spinach seeds stored under dry conditions (50 and 0% RH) (Fig.…”

Section: Discussionmentioning

confidence: 99%

Acyl Carrier Protein Is Conjugated to Glutathione in Spinach Seed

Butt

Ohlrogge²

1991

Plant Physiol.

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Acyl carrier protein (ACP) contains an essential sulfhydryl group in its phosphopantetheine prosthetic group. We have investigated the state of this sulfhydryl in developing and mature spinach seed (Spinacia oleracea). Seed extracts were separated on sodium dodecyl sulfate or native polyacrylamide gels, blotted to nitrocellulose, and probed with antibodies raised against spinach ACP-I. In extracts of mature seeds prepared with reducing agents, ACP-11 migrated as a single major band, whereas extracts prepared without reducing agents gave two major bands. The additional band was identified as a conjugate of ACP-11 to glutathione (ACP-S-S-G) on the basis of its sensitivity to reducing agents and its comigration with standards in both native and sodium dodecyl sulfate gel electrophoresis. In developing spinach seeds ACP-1l exists primarily in its free sulfhydryl form or as acyl derivatives, with essentially no ACP-S-S-G present. During later stages of seed development, as seed water content declines, ACP-S-S-G accumulates to approximately 50% of the total ACP. Seed imbibition results in a rapid decline in ACP-S-S-G levels. The ACP-S-S-G:ACP-SH ratio of seeds during storage was found to be a function of seed water content and this could be manipulated by controlling the relative humidity under which the seeds were stored. We speculate that conjugation of ACP to glutathione protects the ACP from sulfhydryl oxidative damage in dry seeds.The synthesis of fatty acids in plants occurs mainly in plastids and is catalyzed by a series of enzymes together with the protein cofactor, ACP3 (6). In plants, ACP is a small (ca. 9000 D), acidic cofactor which plays a central role in plant lipid metabolism (13). A phosphopantetheine prosthetic group is attached to a seine residue near the middle of the polypeptide and is the site at which acyl chains are esterified during the reactions of fatty acid assembly. In addition to the six enzymatic steps of fatty acid synthesis, ACP also participates in reactions catalyzed by stearoyl-ACP desaturase, two acyl-ACP dependent chloroplast acyltransferases which acylate glycerol-3-phosphate and oleoyl-ACP thioesterase, which

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“…According to Bomben et al (1973), the infinite dilution approximation can be applied for aroma solutions provided that the total mole fraction of organic compounds does not exceed approximately 10 -3…”

Section: Flux Equationsmentioning

confidence: 99%

Using pervaporation data in the calculation of vapour permeation hollow-fibre modules for aroma recovery

Ribeiro

Borges

2004

Braz. J. Chem. Eng.

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-Taking into account the close similarity between pervaporation and vapour permeation techniques, a method for employing pervaporation flux data in the modelling of vapour permeation modules is proposed. It is based on the use of fugacity gradients across the membrane, instead of concentration ones, as the driving force for mass transfer. This procedure is interesting, for instance, in the case of aroma recovery systems, for which there is much more experimental data on pervaporation available in the literature than on vapour permeation. In order to illustrate the application of this method, pervaporation experiments for an isotropic PDMS membrane were conducted with aqueous solutions of ethyl acetate (113-2474 mg/L), and the results obtained were used to enable simulation of different vapour permeation hollow-fibre modules for recovering ethyl acetate from diluted air streams.

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Aroma Recovery and Retention in Concentration and Drying of Foods

Cited by 85 publications

References 70 publications

Carvacrol losses from soy protein coated papers as a function of drying conditions

Carvacrol losses from soy protein coated papers as a function of drying conditions

Acyl Carrier Protein Is Conjugated to Glutathione in Spinach Seed

Using pervaporation data in the calculation of vapour permeation hollow-fibre modules for aroma recovery

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