Application of ultra weak photon emission in evaluation of egg freshness

In order to explore application of the ultra weak photon emission in evaluation and detection of eggs freshness, the spontaneous luminescence (SL) and the delayed luminescence (DL) of ultra weak photon emission in eggs at the storage temperature of 25℃ and 40℃ were studied respectively. The results showed that the intensity of SL slowly increased and the initial intensity of DL slowly decreased with storage time at the storage temperature of 25℃. In reverse, the intensity of SL rapidly increased and the initial intensity of DL rapidly decreased with storage time at the storage temperature of 40℃. The DL of eggs obeyed the law of hyperbolic relaxation. The state parameters of egg based on the integral intensity of DL and the SL intensity in unit time were defined in the paper. There was a good linear relationship between the state parameters of egg and Haugh unit at the storage temperature of 25℃ and 40℃. It showed that the state parameters of egg could be a quantitative criterion for assessing the freshness of eggs