Pore swelling in beads made of cellulose fibres and fibre fragments

Ek, Ragnar; Lennholm, Helena; Davidson, Ricardo; Nyström, Christer; Ragnarsson, Gert

doi:10.1016/0378-5173(95)00034-g

Cited by 32 publications

(19 citation statements)

References 21 publications

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“…Neglecting the recovery of contraction, this swelling of the FD carrot could result from either minor microstructure changes occurring during ice crystal formation which affect the porosity, or more compelling assumption that it is due to changes in the cellulose and pectin present in the dried sample. The swelling of cellulose fibers has been thoroughly studied in the pharmaceutical field and has previously reported (Ek, Lennholm, Davidson, Nystrom, & Ragnarsson, 1995;Hedenus, Stromme Mattsson, Niklasson, Camber, & Ek, 2000;Hermans, 1949). Porous cellulose beads were considered to consist of a three-dimensional skeletal fiber system on which the liquid can be taken up both in the pores between fibers and in the solid fiber matrix itself.…”

Section: Resultsmentioning

confidence: 97%

“…Porous cellulose beads were considered to consist of a three-dimensional skeletal fiber system on which the liquid can be taken up both in the pores between fibers and in the solid fiber matrix itself. Moreover, it was found that the pore size in cellulose beads almost doubled when the beads were swollen in water (Ek et al, 1995). For carrot tissue, it was found that the xylem and phloem very likely participate in the hydrodynamic mechanism of mass transfer (Gras, Vidal-Brotons, Betoret, Chiralt, & Fito, 2002).…”

Section: Resultsmentioning

confidence: 98%

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Liquid imbibition during rehydration of dry porous foods

Saguy

Marabi

Wallach

2005

Innovative Food Science & Emerging Technologies

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 98%

Liquid imbibition during rehydration of dry porous foods

Saguy

Marabi

Wallach

2005

Innovative Food Science & Emerging Technologies

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“…In porous beads, liquid is taken up by both the pores between the fibers and the solid matrix itself (Ek et al, 1995). As a consequence, the air voids refill with water and the internal structure becomes denser (Fig.…”

Section: Discussionmentioning

confidence: 99%

Mutual relationships between soils and biological carrier systems

Zohar‐Perez

Chet

Nussinovitch

2005

Biotechnol. Bioeng.

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Improved viability and antagonistic activity of biocontrol agents during soil inoculation is of crucial importance to their effective application. The chitinolytic bacterium Serratia marcescens was used as a model organism to study the efficacy of freeze-dried alginate beads (in comparison to their non-dried counterparts) as possible carriers for immobilized biocontrol agents. The release of bacteria and chitinolytic enzyme from alginate beads, before and during their application in soil, was examined, and the beads' physical properties characterized. Dispersal of the alginate bead-entrapped S. marcescens in the soil resulted in high soil cell densities throughout the 35 days of the experiment. Chitin inclusion in the beads resulted in significantly higher chitinolytic activity of S. marcescens, increased dry-bead porosity and decreased stiffness. Rehydration of the dried beads (after immersion in soil) resulted in a sixfold increase in weight due to water absorption. No significant differences were found in bacterial count inside the non-dried (gel) versus dried beads. However, higher cell densities and chitinase activity were detected in soil containing dried beads with chitin than in that containing their non-dried counterparts. The biological performance of S. marcescens was examined in the greenhouse: a free cell suspension reduced bean (Phaseolus vulgaris L.) disease by 10%, while immobilized bacteria found in the dried, chitin-containing beads reduced disease by 60%.

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“…Polar solvents also promote interactions between fibres. Ek et al (1995) used 13 C cross-polarisation magic angle spinning (CP/MAS) NMR to measure MCC crystallinity and showed that this increased with the addition of water. Millili et al (1996) also hypothesised that the mechanical strength of their MCC pellets was due to conversion from intra-fibril hydrogenbonds to inter-particle ones upon addition of water.…”

Section: Sourcementioning

confidence: 99%