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Journal of Central European Agriculture, Vol. 26 No. 1, 2025.

Original scientific paper

https://doi.org/10.5513/JCEA01/26.1.4400

Optical analysis, antioxidant activity and microbiological quality of coldpressed pumpkin oil

Vesna ĐUROVIĆ ; University of Kragujevac, Faculty of Agronomy in Čačak, Cara Dušana 34, Čačak, Serbia
Mirjana RADOVANOVIĆ orcid id orcid.org/0000-0003-0337-8706 ; University of Kragujevac, Faculty of Agronomy in Čačak, Cara Dušana 34, Čačak, Serbia *
Dalibor TOMIĆ orcid id orcid.org/0000-0002-2814-1935 ; University of Kragujevac, Faculty of Agronomy in Čačak, Cara Dušana 34, Čačak, Serbia
Miloš MARJANOVIĆ orcid id orcid.org/0000-0003-1772-4374 ; University of Kragujevac, Faculty of Agronomy in Čačak, Cara Dušana 34, Čačak, Serbia
Leka MANDIĆ orcid id orcid.org/0000-0002-6364-7122 ; University of Kragujevac, Faculty of Agronomy in Čačak, Cara Dušana 34, Čačak, Serbia

* Corresponding author.

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Abstract

Consumer interest in minimally processed food, including cold-pressed oil, is growing year by year, along with evidence of the positive effects of various bioactive ingredients that promote health. This study aimed to characterize the coldpressed oils obtained from non-intensively grown pumpkins. Some optical characteristics, content of total phenols and antioxidant activity were determined, as well as microbiological analysis of the obtained oils. Cold-pressed pumpkin oils differ in the ranges of specific absorbances: 3.40–7.04 at 232 nm and 1.96–3.33 at 270 nm. The refractive index at 23 °C varies from 1.4700 to 1.4730. The content of total phenols in pumpkin oil ranged from 1.83 to 4.56 mg GAE (gallic acid equivalent)/100 mL. The results of DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activities, expressed as % inhibition in the lipophilic fraction from pumpkin oil ranged from 42.48% to 66.91%. The number of bacteria and molds determined was by the Regulations, and sulfite-reducing bacteria were not detected in the oils. Cold-pressed oils are a good source of antioxidants and their use is beneficial for human health.

Keywords

cold-pressed oil; Cucurbita pepo; refractive index; specific absorbance; antioxidants; microbiological quality

Hrčak ID:

329548

URI

https://hrcak.srce.hr/329548

Publication date:

28.3.2025.

Article data in other languages: serbian

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