Gamma and electron-beam irradiation as viable technologies for wild mushrooms conservation: effects on macro- and micro-elements
The consumption of mushrooms is increasing all over the world as a result of their sensorial and nutritional qualities. Among their nutrients, mushrooms present high levels of macro- and micro-elements. The qualitative composition in these elements is, however, often unknown. Mushrooms are known also as being very perishable products. Gamma rays or electron-beam irradiation has been applied to improve their shelf life and decrease health hazards caused by microorganisms. In addition, the effects of irradiation on the physicochemical and nutritional parameters of wild mushrooms have been studied by our research group. Nevertheless, the effects on essential macro- and micro-elements of these natural matrices are still unknown. The effects of gamma and electron-beam irradiation on the macro- and micro-elements profiles were evaluated in Boletus edulis, Hydnum repandum and Macrolepiota procera. The same elements were detected in the three species with some quantitative differences. The profiles obtained allowed the definition of proper dietary intakes, thus preventing undesirable effects derived from consuming mushrooms in quantities that exceed threshold levels of these minerals. The applied irradiation doses did not show a systematic effect on the macro- and micro-elements profiles, except for the 10 kGy. Accordingly, irradiation treatment, using gamma rays or electron beam up to 6 kGy, is a suitable technique to disinfest and/or decontaminate wild mushrooms, independently of their species or physical state.
KeywordsWild mushrooms Irradiation Micro-elements Macro-elements Linear discriminant analysis
The authors are grateful to the Foundation for Science and Technology (FCT, Portugal) for financial support to the research centers CIMO (PEst-OE/AGR/UI0690/2011), REQUIMTE (PEst-C/EQB/LA0006/2011) and ALIMNOVA research group from UCM. Â. Fernandes and J. C. M. Barreira thank FCT, POPH-QREN and FSE for their grants (SFRH/BD/76019/2011, SFRH/BPD/72802/2010, respectively).
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Conflict of interest
The authors declare that they have no conflict of interest.
Compliance with ethics requirements
This article does not contain any studies with human or animal subjects.
- 6.Seeger R (1982) Toxische schwermetalle in Pilzen. Dtsch Apoth Ztg 122:1835–1844Google Scholar
- 8.Mahan LK, Escott-Stump S, Raymond JL (2012) Krause Dietoterapia, 13th edn. Elsevier, MexicoGoogle Scholar
- 9.McDowell LR (2003) Minerals in animal and human nutrition, 2nd edn. Elsevier, AmsterdamGoogle Scholar
- 11.FNB (Food and Nutrition Board) (2001) Dietary reference intakes for vitamin A, vitamin K, arsenic, boron, chromium, copper, iodine, iron, manganese, molybdenum, nickel, silicon, vanadium, and zinc. Institute of Medicine, Food and Nutrition Board. National Academy of Sciences, Washington, DCGoogle Scholar
- 13.Işiloğlu M, Yilmaz F, Merdivan M (2009) Concentrations of trace elements in wild edible mushrooms. Food Chem 73:169–175Google Scholar
- 19.Fernandes Â, Barreira JCM, Antonio AL, Santos PMP, Martins A, Oliveira MBPP, Martins A, Ferreira ICFR (2013) Study of chemical changes and antioxidant activity variation induced by gamma-irradiation on wild mushrooms: comparative study through principal component analysis. Food Res Int 54:18–25CrossRefGoogle Scholar
- 22.Fernandes Â, Barros L, Antonio AL, Barreira JCM, Oliveira MBPP, Martins A, Ferreira ICFR (2014) Using gamma irradiation to attenuate the effects caused by drying or freezing in Macrolepiota procera organic acids and phenolic compounds. Food Bioprocess Technol. doi: 10.1007/s11947-013-1248-8 Google Scholar
- 24.ICGFI—International Consultative Group on Food Irradiation (1999) Facts about food irradiation. International Consultative Group on Food Irradiation, BuckinghamshireGoogle Scholar
- 25.Horwitz W, Latimer GW (2005) Official methods of analysis of AOAC International, 18th edn. AOAC International, GaithersburgGoogle Scholar
- 26.Ruiz-Rodríguez B, Morales P, Fernández-Ruiz V, Sánchez-Mata MC, Cámara M, Díez-Marqués C, Pardo-de-Santayana M, Molina M, Tardío J (2011) Valorization of wild strawberry tree fruits (Arbutus unedo L.) through nutritional assessment and natural production data. Food Res Int 44:1244–1253CrossRefGoogle Scholar
- 30.Regulation (EC) No 1169/2011 of the European Parliament and of the Council, of 25 October 2011, on the provision of food information to consumers. Official Journal of the European Union. 22.11.2011. L 304/18-63Google Scholar