Effect of gamma irradiation on antiradical activity of goji berry fruits (Lycium barbarum) evaluated by EPR spectroscopy

Mladenova, Ralitsa; Aleksieva, Katerina; Nacheva, I.

doi:10.1007/s10967-019-06520-x

Cited by 12 publications

(6 citation statements)

References 17 publications

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“…Similar spectra shape and g values were reported for the EPR spectra of dextrose‐radicals (Jo et al., 2018). Cellulose signal was observed in other irradiated fruits as well, such as goji berry fruits (Mladenova, Aleksieva, & Nacheva, 2019), oranges (Jo et al., 2018), and mushrooms (Malec‐Czechowska et al., 2003). Contributions from sugar‐derived radicals were reported to be predominant in carob pods (Tuner & Polat, 2017), pineapple and fig (Guzik et al., 2015), and papaya, melon, and cherry (Yordanov & Aleksieva, 2007).…”

Section: Resultssupporting

confidence: 83%

“…Similar spectra shape and g values were reported for the EPR spectra of dextrose-radicals (Jo et al, 2018). Cellulose signal was observed in other irradiated fruits as well, such as goji berry fruits (Mladenova, Aleksieva, & Nacheva, 2019), oranges (Jo et al, 2018), and mushrooms (Malec-Czechowska et al, 2003).…”

Section: Epr Analysis Of the Sp And Effect Of Sample Preparationsupporting

confidence: 81%

“…Similarly, this singlet line is common to nonirradiated fruits (e.g., goji berry fruits [Mladenova et al., 2019], carob pods [Tuner & Polat, 2017], walnuts [Tomaiuolo et al., 2018], tomatoes [Aleksieva, Georgieva, Tzvetkova, & Yordanov, 2009], and orange peels [Jo et al., 2018]). The native sextet was due to Mn 2+ ions (Mladenova et al., 2019); whereas the native singlet line was attributed to the presence of organic radicals (e.g., semiquinones) (Aleksieva et al., 2009; Jo et al., 2018; Tomaiuolo et al., 2018; Tuner & Polat, 2017). In a similar way, the singlet in control SP was related to the semiquinones present in SPs.…”

Section: Resultsmentioning

confidence: 99%

“…The maximum allowed irradiation dose varies based on product type, expected purpose, and anticipated shelf life. Irradiation doses used for insect disinfestation (e.g., in dried fruits) are typically less than 1 kGy, while irradiation doses used for pest control (e.g., in papayas) and spoilage microorganisms control (e.g., E.coli in ground beef) are between 1 to 10 kGy, and 4.5 to 7 kGy (refrigerated and frozen) (Miller, 2005;Tomaiuolo et al, 2018). The maximum irradiation dose allowed for animal foods (up to 50 kGy) is higher than human foods (up to 30 kGy, except the special cases like sterilization of foods used solely in the National Aeronautics and Space Administration (NASA) space flight programs, which might go up to 100 kGy) (FDA, 2001(FDA, , 2015.…”

Section: Introductionmentioning

confidence: 99%

“…Sweet potatoes (SPs) are popular as dog treats that are often irradiated. SP is rich in carbohydrates and fibers, and typically has low moisture content (Miller, 2005). The low moisture nature of irradiated SP makes it a good candidate for EPR spectroscopy analysis.…”

Section: Introductionmentioning

confidence: 99%

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An analysis of cellulose‐ and dextrose‐based radicals in sweet potatoes as irradiation markers

Tonyalı

Sommers

Cerić

et al. 2020

Journal of Food Science

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Dried sweet potatoes (SPs) are often irradiated for improved safety and shelf life. Formation of irradiation‐derived radicals was analyzed using electron paramagnetic resonance (EPR) spectroscopy. These irradiation‐specific radicals can be used to characterize the irradiation history of dry plant‐based foods containing cellulose and sugars. The signal characteristics (intensity and peak shape) were evaluated at different sample locations (skin and flesh), as a function of sample preparation method (grinding, sieving, and pelletizing). The signal intensity was quantified using a double integration method of the peaks based on the area under the curve. The sieving caused ca. 50% decrease in total signal intensity as compared to nonsieved samples due to loss of cellulose‐based radicals. The flesh of irradiated SP showed complex EPR spectra with multiple satellite peaks of cellulose radicals (333.5 and 338.8 mT) and split peak of dextrose radicals (337.4 mT); while skin spectra were distinctive of cellulose radicals. In this study, we demonstrated the effects of sample composition and preparation method on formation and analysis of irradiation‐specific radicals based on EPR. Practical Application In the last decade or so, there have been health concerns related to the consumption of irradiated pet food products. Electron paramagnetic resonance spectroscopy can be used to analyze the irradiation history of dry products containing cellulose and sugar, such as the popular dog treat dried sweet potatoes, to ensure the products were irradiated within safe limits. This work demonstrates that the formation of irradiation‐specific radicals is affected by the sample location (skin and flesh) and moisture content.

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