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Journal of the Serbian Chemical Society 2024 Volume 89, Issue 1, Pages: 13-27
https://doi.org/10.2298/JSC230517043S
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Antioxidant activity according to bioactive compounds content in dried pumpkin waste

Stajčić Slađana M. (University of Novi Sad, Faculty of Technology, Novi Sad, Serbia), sladja@uns.ac.rs
Pezo Lato L. ORCID iD icon (University of Belgrade, Institute of General and Physical Chemistry, Belgrade, Serbia)
Ćetković Gordana S. (University of Novi Sad, Faculty of Technology, Novi Sad, Serbia)
Čanadanović-Brunet Jasna M. (University of Novi Sad, Faculty of Technology, Novi Sad, Serbia)
Mandić Anamarija I. ORCID iD icon (University of Novi Sad, Institute for Food Technology, Novi Sad, Serbia)
Tumbas-Šaponjac Vesna T. ORCID iD icon (University of Novi Sad, Faculty of Technology, Novi Sad, Serbia)
Vulić Jelena J. ORCID iD icon (University of Novi Sad, Faculty of Technology, Novi Sad, Serbia)
Travičić Vanja N. (University of Novi Sad, Faculty of Technology, Novi Sad, Serbia)
Belović Miona M. ORCID iD icon (University of Novi Sad, Institute for Food Technology in Novi Sad, Novi Sad, Serbia)

In this study freeze-drying and oven-drying (at 50 and 65 °C) were applied for the preparation of dried pumpkin waste. The effect of drying methods on physical properties (moisture content, water activity, hygroscopicity, water solubility, bulk and tapped density, flowability and colour), content of bioactive compounds (carotenoids and phenolics) and antioxidant activity were investigated. Also, the influence of one-year storage at –20 °C on the bioactive compounds content and the antioxidant activity of dried pumpkin waste was examined. Results indicated that drying method showed a significant impact on the investigated characteristics. Bioactive compounds content and antioxidant activity by DPPH test of freeze-dried were higher than of oven-dried pumpkin waste, while higher antioxidant activity in reducing power assay was determined by oven-dried pumpkin waste. An artificial neural network model was developed, for the anticipation of antioxidant activity according to bioactive compounds content (phenolics and carotenoids), in oven-dried (at 50 and 65 °C) and in freeze-dried pumpkin waste after one-year storage. These models showed good prediction properties (the r2 value during training cycle for output variables was 0.999). It was demonstrated that pumpkin waste is potentially an important source of bioactive compounds, which can be used after extraction in suitable forms in the development of functional food products.

Keywords: Cucurbita moschata, carotenoids, polyphenols, antioxidants, artificial neural network

Project of the Ministry of Science, Technological Development and Innovation, Republic of Serbia, Grant no. 451-03-47/2023-01/200134, Grant no. 451-03-47/2023-01/200051 and Grant no. 451-03-47/2023-01/200222

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