Original scientific paper

https://doi.org/10.31727/gzb.40.6.10

The impact of pressing conditions of pumpkin seeds and adding of antioxidants on yield and oxidative stability of cold pressed oils

Tihomir Moslavac ; Sveučilište Josipa Jurja Strossmayera, Prehrambeno-tehnološki fakultet Osijek
Stela Jokić ; Sveučilište Josipa Jurja Strossmayera, Prehrambeno-tehnološki fakultet Osijek
Tena Jurić ; Sveučilište Josipa Jurja Strossmayera, Prehrambeno-tehnološki fakultet Osijek
Hrvoje Krajna ; Hrvatski Veterinarski Institut, Veterinarski zavod Vinkovci
Anastazija Konjarević ; Hrvatski Veterinarski Institut, Veterinarski zavod Vinkovci
Benjamin Muhamedbegović ; Univerzitet u Tuzli, Tehnološki fakultet Tuzla
Drago Šubarić ; Sveučilište Josipa Jurja Strossmayera, Prehrambeno-tehnološki fakultet Osijek

Abstract

Pumpkin seed oil belongs to the group of exclusive and very expensive edible oils, and its nutritive quality justify the high price. In this study the influence of parameters cold pressing pumpkin seeds on yield oil was investigated. The following parameters such as electromotor frequency, nozzle size, the addition of the sunflower shell and the microwave heating of pumpkin seed to the oil production were studied. The increase in the electromotor frequency and nozzle size had resulted in a reduction in the amount of produced oil. By applying standard methods, basic oil quality parameters were determined: peroxide number, free fatty acid, percentage of insoluble impurities and moisture content. Also, the addition of a mixture of natural antioxidants to the oxidative stability of cold-pressed pumpkin oil was studied. The following antioxidants were used: pomegranate extract, rosemary extract (type Oxy'Less Clear), sea buckthorn essential oil and basil essential oil in combination with green tea extract. The oxidative stability of the pumpkin oil was determined by the accelerated oxidation test - Schaal Oven test (63 °C), and the result of oil oxidation was expressed by peroxide number. The research results show that the nozzle size and the electromotor frequency significantly influence on yield of cold pressed pumpkin seed oil. The best antioxidant effect in cold pressed pumpkin oil has shown the addition of green tea extract with an sea buckthorn essential oil.

Keywords

pumpkin seed oil; screw press; oxidative stability; natural antioxidants

Hrčak ID:

191133

URI

https://hrcak.srce.hr/191133

Publication date:

15.12.2017.

Article data in other languages: croatian

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