Journal
CARBOHYDRATE POLYMERS
Volume 84, Issue 1, Pages 373-382Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2010.11.047
Keywords
Rice starch; Hydrocolloid; Pasting; Viscoelastic properties; Swelling
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Funding
- University of California-Davis
- Ministry of Education and Science
- Spanish Research National Council (CSIC)
- Spanish Ministerio de Ciencia e Innovacion [AGL2008-00092/ALI]
- Spanish Ministry of Education and Science
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Hydrocolloids are frequently used for modifying starch functionality. In the present study the possible interaction of three different hydrocolloids - guar gum, hydroxypropylmethylcellulose (HPMC) and xanthan gum - with rice starch was explored by determining the pasting, viscoelastic and swelling properties of the rice starch-hydrocolloids mixtures. The impact of successive heating-cooling cycles on the pasting, viscoelasticity and swelling was also determined. Hydrocolloids tested in the range 0.2-0.8% (w/w) significantly modified the pasting, viscoelastic and swelling properties of rice starch-hydrocolloid pastes (8%, w/w) and the extent of the effect was dependent on hydrocolloid concentration. Guar and xanthan gum mixtures with rice starch had the greatest effect on the pasting properties, whereas HPMC mixtures only changed the viscosity during cooling. The starch-hydrocolloids pastes formed weaker gels compared to those of the starch alone. Rheological results suggested the formation of composite network structures with high frequency dependence. Successive multiple-heating cycles allowed the gel to rearrange resulting in altered gel viscoelasticity and release of water soluble compounds that favour phase separation at the highest hydrocolloid level tested. (C) 2010 Elsevier Ltd. All rights reserved.
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