Abstract
Rosehip seeds (RS) are rich in important dietary antioxidants such as polyphenolic substances, vitamins and carotenoids. In the present study dried RS samples were exposed to gamma-irradiation at doses of 10 and 25 kGy. Free radicals, induced in seeds by ionizing rays and their time stability were investigated. Electron Paramagnetic Resonance (EPR) study revealed that carbon-centered radicals from the cellulose are generated in the samples irradiated by both doses, in addition spectrum, attributed to starch free radicals was observed at 25 kGy irradiated seeds. The EPR signals were reduced significantly for 120 days after treatment. The effect of irradiation on antiradical activity of rosehip defatted seed extracts was evaluated using the stable free radical 1,1-diphenyl-2-picrylhydrazyl (DPPH). The results show that free radical scavenging activity increased in irradiated rosehip seeds samples with approximately 19% compared to that of untreated seeds. For evaluation of antiradical activity of the sample extracts before and after irradiation the IC50 as well as Trolox Equivalent Antioxidant Capacity (TEAC) value were calculated.
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Acknowledgements
R. M. and K. A. thank the Bulgarian National Science Fund - Bulgarian Ministry of Education within the framework of Project “KP-06-N 39/12” for the financial support. Research equipment of distributed research infrastructure INFRAMAT (part of Bulgarian National roadmap for research infrastructures) supported by Bulgarian Ministry of Education and Science was used in this investigation.
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This research was funded by the Bulgarian National Science Fund, grant KP-06-N 39/12 from December 2019.
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Conceptualization and methodology, R. Mladenova and K. Aleksieva; Material preparation, Sabina Taneva, and Desislava Teneva; Investigation, and analysis, R. Mladenova, K. Aleksieva, and O. Sabotinov; Writing-original draft preparation, R. Mladenova; Reviewing the manuscript, R. Mladenova, K. Aleksieva, S. Taneva, O. Sabotinov, and D. Teneva. All authors have read and approved the final manuscript.
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Mladenova, R.B., Aleksieva, K., Taneva, S. et al. EPR characterization of the gamma irradiation effect on antiradical activity and free radicals generation of dried rosehip (Rosa canina L.) seeds. Food Measure 18, 529–537 (2024). https://doi.org/10.1007/s11694-023-02196-w
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DOI: https://doi.org/10.1007/s11694-023-02196-w