Rheology and microstructure of carrot and tomato emulsions as a result of high-pressure homogenization conditions
Journal article, 2011

High-pressure homogenization, as a way to further mechanically disrupt plant cells and cell walls compared to conventional blending, has been applied to thermally treated and comminuted carrot and tomato material in the presence of 5% olive oil. Mixes of both vegetables in a 1:1 ratio were also included. Both the effect of homogenization pressure and the effect of multiple process cycles were studied. The different microstructures generated were linked to different rheological properties analyzed by oscillatory and steady state measurements. The results showed that while carrot tissue requires a high shear input to be disrupted into cells and cell fragments, tomato cells were broken across the cell walls already at moderate shear input, and the nature of the tomato particles changed to amorphous aggregates, probably composed of cell contents and cell wall polymers. All the plant stabilized emulsions generated were stable against creaming under centrifugation. While for tomato a low-pressure multiple cycle and a high-pressure single-cycle process led to comparable microstructures and rheological properties, carrot showed different rheological properties after these treatments linked to differences in particle morphology. Mixes of carrot and tomato showed similar rheological properties after homogenizing in a single or in a split-stream process.


high-pressure homogenization




Patricia Lopez-Sanchez


Cecilia Svelander

Chalmers, Chemical and Biological Engineering, Life Sciences, Food and Nutrition Science

L Bialek


S Schumm


Maud Langton

SIK – the Swedish Institute for Food and Biotechnology

Journal of Food Science

0022-1147 (ISSN)

Vol. 76 1 E130-E140

Subject Categories

Food Engineering

Areas of Advance

Life Science Engineering (2010-2018)

Materials Science



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