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Homolya Szabolcs

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Homolya Szabolcs
Preliminary Experiments for the Rheological Study of Oleogels

Aug 29 - kedd

15:30 – 17:00

I. Poszterszekció

P13

Preliminary Experiments for the Rheological Study of Oleogels

Szabolcs Homolya1, Katalin Badakné Kerti1, Eszter Vozáry2, Tímea Kaszab2 and Anikó Lambertné Meretei1

1,2 Hungarian University of Agriculture and Life Science, Institute of Food Science and Technology

1Department of Grain and Industrial Crops

2Department of Food Industrial measurements and Control

Due to deforestation to expand oil palm plantations and the many negative health effects of palm oil, the food industry needs other alternative sources of fats to replace palm oil. In our research, we investigated blends of fully hydrogenated rapeseed oil and non-hydrogenated high oleic sunflower oil, as well as beeswax and high oleic sunflower oil as possible oleogel alternatives. Oleogels are gelled forms of vegetable oils. Gelling agents can be waxes or proteins. The rheological properties of these oleogels were compared with the rheological properties of palm oil and a commercially available confectionery fat.

The rheological measurements were performed on the following materials: Unfractionated palm oil, Chocofill confectionery fat, Blends of fully hydrogenated rapeseed oil and non-hydrogenated high oleic sunflower oil: 25 m/m% rapeseed oil + 75 m/m% sunflower oil; 30 m/m% rapeseed oil + 70 m/m% sunflower oil; 35 m/m% rapeseed oil + 65 m/m% sunflower oil and Beeswax and high oleic sunflower oil mixture: 85 m/m% sunflower oil + 15 m/m% beeswax.

The flow curve in the shear rate range 0,1 to 100 1/s, as well storage (G’) and loss (G”) modules of oleogels, palm oil and confectionery fat were determined with an Anton-Paar MCR302 oscillatory rheometer. The flow curves were approximated with the Hershel-Bulkley and Casson model using the Excel Solver program. The linear viscoelastic limit was determined from the curves obtained by amplitude sweeping.

The confectionary fat showed rheological similarity with palm oil, however, this type of sample was the furthest from the rapeseed-sunflower and beeswax-sunflower blends in rheological properties. Based on the data analyses and the characteristics of the substitute blends, the sample containing 35% fully hydrogenated rapeseed oil and beeswax oleogel might be suitable as palm oil substitutes, but further studies are needed to determine this statement.