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Full-Text Articles in Life Sciences

Effect Of Cooling Rate On Crystallization Behavior Of Milk Fat Fraction/Sunflower Oil Blends, Silvana Martini, M. L. Herrera, R. W. Hartel Nov 2001

Effect Of Cooling Rate On Crystallization Behavior Of Milk Fat Fraction/Sunflower Oil Blends, Silvana Martini, M. L. Herrera, R. W. Hartel

Nutrition, Dietetics, and Food Sciences Faculty Publications

The effect of cooling rate (slow: 0.1°C/min; fast: 5.5°C/min) on the crystallization kinetics of blends of a highmelting milk fat fraction and sunflower oil (SFO) was investigated by pulsed NMR and DSC. For slow cooling rate, the majority of crystallization had already occurred by the time the set crystallization temperature had been reached. For fast cooling rate, crystallization started after the samples reached the selected crystallization temperature, and the solid fat content curves were hyperbolic. DSC scans showed that at slow cooling rates, molecular organization took place as the sample was being cooled to crystallization temperature and there was fractionation …


Effect Of Cooling Rate On Nucleation Behavior Of Milk Fat-Sunflower Oil Blends, Silvana Martini, M. L. Herrera, R. W. Hartel Jun 2001

Effect Of Cooling Rate On Nucleation Behavior Of Milk Fat-Sunflower Oil Blends, Silvana Martini, M. L. Herrera, R. W. Hartel

Nutrition, Dietetics, and Food Sciences Faculty Publications

The effect of cooling rate on the crystallization behavior of mixes of high-melting milk fat fraction (HMF) and sunflower oil (SFO) was studied by following nucleation with laser-polarized turbidimetry. The initial crystals were photographed, and their thermal and polymorphic behaviors, as well as chemical composition, were investigated by calorimetry, X-ray diffraction, and capillary gas chromatography. Activation energies of nucleation were calculated using the Fisher−Turnbull equation. Despite small differences in Mettler dropping points for different ratios of SFO to HMF, induction times were significantly different between samples and were shorter at a slow cooling rate for the same supercooling. Rapidly cooled …


Habitat Fragmentation And Native Bees: A Premature Verdict?, James H. Cane Jan 2001

Habitat Fragmentation And Native Bees: A Premature Verdict?, James H. Cane

All PIRU Publications

No abstract provided.


Causes And Extent Of Declines Among Native North American Invertebrate Pollinators: Detection, Evidence, And Consequences, James H. Cane, Vincent J. Tepedino Jan 2001

Causes And Extent Of Declines Among Native North American Invertebrate Pollinators: Detection, Evidence, And Consequences, James H. Cane, Vincent J. Tepedino

All PIRU Publications

No abstract provided.