Document Detail

Rheology and Microstructure of Carrot and Tomato Emulsions as a Result of High-Pressure Homogenization Conditions.
MedLine Citation:
PMID:  21535664     Owner:  NLM     Status:  Publisher    
  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. Practical Application:  Following consumers' demand, the food industry has shown a growing interest in manufacturing products free of gums and stabilizers, which are often perceived as artificial. By tailored processing, fresh plant material could be used to structure food products in a more natural way while increasing their nutritional quality.
Patricia Lopez-Sanchez; Cecilia Svelander; Lucy Bialek; Stephan Schumm; Maud Langton
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2010-11-10
Journal Detail:
Title:  Journal of food science     Volume:  76     ISSN:  1750-3841     ISO Abbreviation:  -     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-5-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0014052     Medline TA:  J Food Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  E130-E140     Citation Subset:  -    
Authors Lopez-Sanchez, Bialek, and Schumm are with Unilever R & D, Structured Materials and Process Science, Olivier Van Noortlaan 120, PO Box 114, 3130 AC Vlaardingen, The Netherlands. Author Lopez-Sanchez and Langton are with SIK-Swedish Inst. for Food and Biotechnology, Structure and Material Design, Box 540, 1 402 29 Göteborg, Sweden. Authors Lopez-Sanchez and Svelander are with Dept. of Chemical and Biological Engineering, Food Science, Chalmers Univ. of Technology, 412 96 Göteborg, Sweden. Direct inquiries to author Lopez-Sanchez (E-mail:
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