The prediction of moisture sorption isotherms for freeze-dried oil-in-water emulsion stabilized with hydrophobically-modified starch

Varsha VIJAYAN, Mingduo MU, Rammile Ettelaie, Amin Farshchi

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Abstract

Octenyl succinic anhydride-modified starch has been successfully used as an emulsifier, e.g., as an encapsulating agent for fish oils, fat-soluble vitamins and flavours, in making bread, cake and cookies. Enriched dried emulsions stabilised with modified starches can also be used as an ingredient in cereal products to play a functional role and fortify.
In general, redispersible dry emulsions stabilized with biopolymers have a tendency to cake and agglomerate particularly during storage under humid conditions. Moisture uptake may therefore play a key role in the functional properties of these powders such as flow behaviour, bulk density, dissolution rate and caking during storage or transport to the customer if the environmental relative humidity is not controlled. In this work, a model oil-in-water emulsion containing 2.0 wt% octenyl succinic anhydride-modified starch acting as an emulsifier was produced using a jet homogenizer and was subsequently freeze-dried. The water sorption characteristics of freeze-dried oil-in-water emulsions were then studied using a dynamic vapour sorption (DVS) apparatus. The water sorption isotherms showed a noticeable increase in equilibrium moisture content (EMC) values above 65% RH, suggesting a change in the mechanism of water sorption by starch molecules. The experimental water sorption isotherms were fitted to three mathematical models: Brunauer-Emmett-Teller (BET), Guggenheim-Anderson-de Boer (GAB) and Oswin. Comparison of predicted values of EMC with experimental values using E (Mean percentage deviation modulus) and R2 (coefficient of determination) value showed that all three models were satisfactory for predicting the isotherms of oil-in-water emulsions. Also, it was shown that the GAB model provides the best fit for describing both sorption and desorption isotherm of freeze-dried emulsion.
Original languageEnglish
Publication statusPublished - 2021
Event16th ICC Cereal and Bread Congress - Lincoln University, Lincoln, New Zealand
Duration: 29 Mar 202131 Mar 2021
https://icbc2020.icc.or.at/en/

Conference

Conference16th ICC Cereal and Bread Congress
Country/TerritoryNew Zealand
CityLincoln
Period29/03/2131/03/21
Internet address

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