The EPR detection of foods preserved with the use of ionizing radiation

Identification and Characterization of Gamma‐Irradiated Dried Lentinus edodes Using ESR, SEM, and FTIR Analyses

“…All nonirradaited samples provided a similar native and weak spectrum comprised of a single peak with a g value close to 2.0076 (Figure 1). A similar central signal has also been reported for other mushrooms such as Agaricus campastris (Stachowicz and others 1995) and Pleurotus ostreatus (Bercu and others 2010) samples. Peak intensity was highest in the nonirradiated whole dried mushroom sample.…”

“…In contrast, ESR analysis is based upon radiation‐induced free radicals and requires a very small sample size. Various scientists reported radiation‐induced cellulose and crystalline sugar signals in different dried mushroom samples (Stachowicz and others 1995; Malec‐Czechowska and others 2003; Bercu and others 2010); however, the attempts remained unsuccessful in the case of dried L. edodes samples (Malec‐Czechowska and others 2003). …”

Aspects of detection of irradiated foods by EPR spectroscopy

“…The following classes of foodstuffs were examined: pork, beef, poultry, fish, egg shell, seeds of raw and dried fruits, assortment of spices and herbs, dried vegetables and mushrooms, dehydrate gelatin, macaroni, flavour additives. With all of them positive results of the detection of irradiation have been achieved [4][5][6]. We participated from 1989 to 1994 in ADMIT (Analytical Detection Methods for Irradiation Treatment of Foods) Programme co-ordinated by Joint FAO/IAEA Division in co-operation with WHO [7] and were actively involved in a number of international intercomparison studies on irradiated foodstuffs organized by CEC, ADMIT, MAFF [8].…”

“…The successive measurements done at different time intervals allow one to construct kinetic decay curves for specific radicals selected to be used as the indicators of irradiation while the analysis of these curves allows one to evaluate in advance, without prolonged measurements, the detection period for each radical. The examples of the application of quantitative EPR measurements for this purpose can be found elsewhere [6].…”

Detection of gamma irradiated fig seeds by analysing electron spin resonance

“…Irradiation is increasingly being recognised as an effective technology to reduce postharvest losses and improve quality . In this work, the radiation doses were applied in the range of 0.3-6 kGy in order to cover the recommended doses for insect disinfestations (0.1-1 kGy) and increase in the shelf-life of some fruits by reduction of the spoilage flora (1-5 kGy) (ACSH, 1988;Marchioni, 2008 (Stachowicz, Burlinska, Michalik, Goclawska, & Ostrowski, 1995;Yordanov & Pachova, 2006). Therefore, more detailed information, especially related to the kinetic features and activation energies of the contributing radical species at room and higher temperatures, are needed.…”