TY - JOUR
T1 - Shear and Longitudinal Ultrasonic Measurements of Solid Fat Dispersions
AU - Saggin, Raffaella
AU - Coupland, John N.
N1 - Funding Information:
We are grateful to the Center for Food Manufacturing (Penn State) for funding the work and to Lynn Dalby for assistance with the microscopy.
PY - 2004/1
Y1 - 2004/1
N2 - Dispersions of coating fat in corn oil (2.5-12.5 wt%) were prepared following two different protocols: Type A dispersions had an average crystal size of 30-36 μm, whereas type B dispersions were less than 1 μm. In both dispersions the fat crystals were aggregated into larger structures (up to 80 μm). The longitudinal ultrasonic properties (i.e., velocity, attenuation, and reflectance) were linearly related to the solid fat content, but only attenuation was sensitive to the different microstructures. The velocity and reflectance measurements were modeled using the Urick equation. Shear ultrasonic reflectance and oscillatory viscometry were used to measure the dynamic viscosity of all dispersions. According to both methods, type B samples were always more viscous than type A at a similar solids content. The correlation between the two techniques was good (r2 > 0.99), but the numeric agreement was different for both systems.
AB - Dispersions of coating fat in corn oil (2.5-12.5 wt%) were prepared following two different protocols: Type A dispersions had an average crystal size of 30-36 μm, whereas type B dispersions were less than 1 μm. In both dispersions the fat crystals were aggregated into larger structures (up to 80 μm). The longitudinal ultrasonic properties (i.e., velocity, attenuation, and reflectance) were linearly related to the solid fat content, but only attenuation was sensitive to the different microstructures. The velocity and reflectance measurements were modeled using the Urick equation. Shear ultrasonic reflectance and oscillatory viscometry were used to measure the dynamic viscosity of all dispersions. According to both methods, type B samples were always more viscous than type A at a similar solids content. The correlation between the two techniques was good (r2 > 0.99), but the numeric agreement was different for both systems.
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U2 - 10.1007/s11746-004-0854-2
DO - 10.1007/s11746-004-0854-2
M3 - Article
AN - SCOPUS:1942509647
SN - 0003-021X
VL - 81
SP - 27
EP - 32
JO - JAOCS, Journal of the American Oil Chemists' Society
JF - JAOCS, Journal of the American Oil Chemists' Society
IS - 1
ER -