2005
DOI: 10.1590/s0100-879x2005000800008
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Abstract: Pressure-induced dissociation of a turbid solution of casein micelles was studied in situ in static and dynamic light scattering experiments. We show that at high pressure casein micelles decompose into small fragments comparable in size to casein monomers. At intermediate pressure we observe particles measuring 15 to 20 nm in diameter. The stability against pressure dissociation increased with temperature, suggesting enhanced hydrophobic contacts. The pressure transition curves are biphasic, compatible with a… Show more

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Cited by 42 publications
(29 citation statements)
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“…After treatment at 400 MPa, the particle size was almost half (121 nm) of the original size. The changes in particle size were due to the disintegration of the casein micelles and subsequent re-association to different extents on the release of applied pressure, as previously reported (Huppertz, Fox, & Kelly, 2004b;Gebhardt, Doster, & Kulozik, 2005;Gebhardt, Doster, Friedrich, & Kulozik, 2006;Huppertz, Fox, De Kruif, & Kelly, 2006). While Huppertz et al (2004b) reported an increase in micelle size on the treatment of skim milk at 250 MPa, this was not observed here, perhaps because the treatment time of 10 min was not sufficient to cause this effect (which was reported for treatment times >20 min, with a small decrease in size being observed for treatment for 10 min, as observed here).…”
Section: Particle Sizesupporting
confidence: 77%
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“…After treatment at 400 MPa, the particle size was almost half (121 nm) of the original size. The changes in particle size were due to the disintegration of the casein micelles and subsequent re-association to different extents on the release of applied pressure, as previously reported (Huppertz, Fox, & Kelly, 2004b;Gebhardt, Doster, & Kulozik, 2005;Gebhardt, Doster, Friedrich, & Kulozik, 2006;Huppertz, Fox, De Kruif, & Kelly, 2006). While Huppertz et al (2004b) reported an increase in micelle size on the treatment of skim milk at 250 MPa, this was not observed here, perhaps because the treatment time of 10 min was not sufficient to cause this effect (which was reported for treatment times >20 min, with a small decrease in size being observed for treatment for 10 min, as observed here).…”
Section: Particle Sizesupporting
confidence: 77%
“…This has previously been reported for treatment at 250 MPa for temperatures up to 40°C (Gaucheron, Famelart, Marlette, Raulot, Michel & Le Graet, 1997;Huppertz et al, 2004b) and at 70°C (Anema, 2008a). Gebhardt et al (2005) presented a temperature-pressure profile (10-80°C and 50-350 MPa) of the dissociated fraction of casein micelles at pH 7.3 using mathematical models and suggested the existence of a pressure-unstable state dominant at low temperatures and a pressure-stable state dominant at high temperatures. In addition, Anema (2008b) reported a broadening of the particle size distribution on HP treatment of skim milk (reconstituted to 15% TS) at 300 MPa for 30 min, with a mixture of particles of larger and smaller sizes than those found in untreated milk.…”
Section: Particle Sizementioning
confidence: 99%
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“…() reported that after evaporation, alterations of the colloidal solubility of CM were detected and Gebhardt et al . () stated that pressure induced dissociation is only partly reversible.…”
Section: Introductionmentioning
confidence: 99%
“…Due to negatively charged caseins at native conditions, the model also predicts repulsion forces between caseins which destabilize the casein micelles. In situ HP studies on casein micelles have been reported recently [9][10][11][12].…”
Section: Introductionmentioning
confidence: 99%