Research noteModeling total volatile basic nitrogen production as a dose function in gamma irradiated refrigerated squid rings

- Total volatile basic nitrogen (TVBN) was modeled in gamma irradiated squid rings.
- TVBN experimental curves were accurately fitted to modified Gompertz model.
- Gompertz model parameters were modeled with dose-dependent second order polynomials.
- Validated complete model accurately predicted TVBN behavior as a dose function in squid.
- This spoilage index can be properly predicted in irradiated (0-5.8 kGy) squid rings.

The behavior of a chemical spoilage index for marine products (total volatile basic nitrogen - TVBN) was modeled as a function of the irradiation dose in Illex argentinus rings stored in refrigeration. The effect of gamma irradiation at 0, 1.8, 3.3 and 5.8 kGy on TVBN was analyzed in vacuum-packed squid rings during storage at 4 ± 1 °C. The modified Gompertz model satisfactorily described TVBN behavior for each irradiation dose (R2 > 0.980; RMSE < 5.7). Gompertz model parameters (μ, A, L) were modeled with dose-dependent second order polynomials, for doses ranging between 0 and 5.8 kGy, in order to develop a complete model that is useful for predicting TVBN as a function of the dose in squid rings. Model validation was carried out using independent data of TVBN in squid rings irradiated at 4.8 kGy. The developed model can be used to predict TVBN production in gamma irradiated squid meat.