AGFD 170 |
| The rheological behaviors of turbid carrot juice at different temperatures, concentrations and granule sizes were studied by determination of the viscosity variations and the double reciprocal plots in this paper. The viscosity of turbid carrot juice increased as the concentration increased and decreased as temperature increased. The effects of temperature on the viscosity of the juices composed mainly of the flesh granules were found according with the Arrhenius equation:ç =ç0 exp(Ea/RT), where ç is the apparent viscosity in Pa•s, Ea the activation energy, R the gas constant, T the absolute temperature in Kelvin, and ç0 the constant. For the juice containing mainly flesh granules of 50 micrometer, ç=0.0091exp(1383.1/T), for the juice containing mainly flesh granules of 211 micrometer, ç=0.0174exp(1151.5/T) and for the juice containing mainly flesh granules of 246 micrometer, ç=0.0306exp(968.66/T). The effects of concentration (unsolvable solids content) at very low concentration on viscosity of carrot juices were found according with the exponential equation ç=ç0exp(AC), where C is the concentration in Brix and A the constant. For the juice composed mainly of flesh granules of 246 micrometer, ç=0.0144exp(8.3125C0), for the juice composed of mainly flesh granules of 211 micrometer, ç=0.0860exp(5.4683C0) |
|
General Posters
1:00 PM-3:00 PM, Tuesday, August 21, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Agricultural & Food Chemistry |