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Wheat starch gelatinization: The effects of sucrose, emulsifier and the physical state of the emulsifier
SIK – Institutet för livsmedel och bioteknik.
SIK – Institutet för livsmedel och bioteknik.
2003 (English)In: Starke (Weinheim), ISSN 0038-9056, E-ISSN 1521-379X, Vol. 55, no 42067, 150-161 p.Article in journal (Refereed)
Abstract [en]

The effect of emulsifier and/or sucrose on the swelling of an 8% wheat starch dispersion was evaluated by microscopy. Visual observations of smeared starch pastes under the light microscope, image analysis of the starch granule sizes and viscosity measurements of the starch paste during heating were combined to explain the effects of the added ingredients. Sucrose (12 or 24%, w/w) was shown to delay the swelling of the granules at least up to 50°C. Above this temperature, the leakage of amylose and granule fragmentation were delayed, but the swelling itself seemed to be accelerated. The polyglycerol ester emulsifier (PGE/MG) at concentrations of 0.5 and 4.0% hindered amylose leakage completely up to 90°C, followed by a sudden granule rupture. The size of the granules increased up to about 70°C, but not above this temperature. The monoglyceride (MG) emulsifier in ?-form already had a restrictive effect on the swelling at low temperatures, while the same emulsifier in ?-form did not restrict the swelling until higher temperatures were reached. The emulsifier itself converted into the lamellar state at between 55 and 70°C, irrespective of the initial form, but the final viscosity was higher in the paste with MG in ?-form. Thus, the initial physical state of the emulsifier was shown to have an influence on the final properties of the gel. © 2003 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Place, publisher, year, edition, pages
2003. Vol. 55, no 42067, 150-161 p.
Keyword [en]
Food Engineering
Keyword [sv]
Livsmedelsteknik
National Category
Food Science
Identifiers
URN: urn:nbn:se:ri:diva-9378OAI: oai:DiVA.org:ri-9378DiVA: diva2:967253
Available from: 2016-09-08 Created: 2016-09-08Bibliographically approved

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