Bone, chicken, irradiated

Chicken can be retailed either frozen or chilled and irradiation can also be applied under both of these temperature regimes. In samples irradiated in the frozen state, the movement of free radicals is hindered and as expected fewer radicals are trapped in the bone. Consequently, the intensity of the signal induced in bone from irradiated frozen chicken was lower than in samples from chilled poultry carcasses given the same irradiation dose (Dodd etal., 1992 Stevenson and Gray, 1990) (Figure 4). 

Gray, R. and Stevenson, M.H. (1990b). Effect of length of storage on the ESR signal from various bones in irradiated chicken carcasses. Int. J. Food Sci. Technol. 25. 506. 

Variables associated with several aspects of the processing chain from primary production through irradiation processing and storage conditions to consumption have been examined using mainly chicken bone. 

The possibility of using the technique to provide an estimate of the absorbed dose was demonstrated when it was shown that the intensity of the signal induced in chicken bone increased linearly with irradiation dose over the range 2.5 kGy to 10 kGy (Stevenson and Gray, 1989b) (Figure 2)... 

Effect of sample preparation on the relative EPR signal strengths from irradiated chicken bones... 

Figure 2. Response of EPR signal to dose in irradiated chicken bone. (From Stevenson and Gray, 1989b).

Stevenson, M.H. and Gray, R. (1989a). An investigation into the effect of sample preparation methods on the resulting ESR signal from irradiated chicken bone. J. Sci. Food Agric. 48,261. 

Figure 1 ESR spectra of a Chicken bone irradiated at 3 kGy. (a) Absorption spectrum, (b) derivative curve of the absorption spectrum, h is the height of the derivative curve...

Figure 3 ESR spectra of a non irradiated (a) and 5 kGy (b) irradiated chicken bone sample. A and B radiation specific ESR signals and C symetric non radiation specific signals.

Figure 7 SR spectra obtained (a) with the CEN protocol applied on a piece of drumstick chicken bone and (b) with recovered bone fragments from a sample of irradiated MRM.

Figure 1 EPR spectrum of an irradiated chicken bone recorded with the e-scan Food Analyzer. The spectrum of the sample ( axially symmetric line shape at the center of the field sweep) is measured in parallel with the spectrum of the reference marker (isotropic signal line shape to higher field at the right) with a known g value (1.980). The horizontal axis gives the Bo field values in Gauss. The two g-values are evaluated automatically.

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