Li Wansha, Lin Huiying, Zhang Hao, Svanberg Katarina, Svanberg Sune
Center of Optical and Electromagnetic Research, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, China.
Lund Laser Center, Lund University, Lund, Sweden.
J Biophotonics. 2018 Mar;11(3). doi: 10.1002/jbio.201700154. Epub 2017 Oct 12.
Nonintrusive methods for characterizing food products are of increasing interest related to the greater awareness of food safety issues. Hen eggs are an important part in food consumption in most parts of the world. We have investigated an optical method utilizing tunable diode lasers for monitoring free gas in eggs. We show that oxygen signals, recorded around 760 nm, increase steadily as eggs become older. Further, we investigated fertilized eggs, which show a quite different temporal behavior during the hatching time. The oxygen signal decreases here with time, while water vapor, recorded around 937 nm, shows a steady increase. Conclusions regarding the size of the air cell and the oxygen availability in fertilized eggs are drawn. The technique might be developed for automatic control of egg freshness, as well as for assessing if eggs are fertilized or not.
随着对食品安全问题的认识不断提高，用于表征食品的非侵入性方法越来越受到关注。鸡蛋是世界上大多数地区食品消费的重要组成部分。我们研究了一种利用可调谐二极管激光器监测鸡蛋中游离气体的光学方法。我们发现，在760纳米左右记录的氧气信号会随着鸡蛋存放时间变长而稳步增加。此外，我们还研究了受精鸡蛋，其在孵化期间表现出截然不同的时间行为。此处氧气信号随时间下降，而在937纳米左右记录的水蒸气信号则稳步上升。由此得出了关于受精鸡蛋气室大小和氧气供应情况的结论。该技术有望用于鸡蛋新鲜度的自动控制，以及判断鸡蛋是否受精。
