Abstract
Irradiating the sardine Sardinella melanura (Cuvier) with 15,000 or 23,000 rad from a cobalt source increased the storage life at 1 C in thermoregulated cabinets. During storage the rates of increase in pH, total volatile nitrogen (TVN), tyrosine value (TV), and bacteriological count (BC) were diminished by raising the radiation dose and those for TVN, TV, and BC a so by treatment with chlortetracycline (CTC). The edibility periods, as judged organoleptically, were 4 days for untreated samples, 8 and 11 days for samples irradiated at 13,000 and 23,000 rad, and 12 days for samples treated with CTC. After 8 days' storage the TVN and TV values for samples treated with CTC were lower in relation to the values just after treatment than were those for samples irradiated at either dose. At 8 days, the BC values for samples treated with CTC were 136 times those just after treatment, in comparison with 11 times for the irradiated samples; however, the counts at 8 days were less than half as high for samples treated with CTC as for those irradiated at 23,000 rad.
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