皮蛋壳表层红色斑块成分的分析与鉴定

Analysis and identification of red patch components on preserved egg shell surface

目的 分析鉴定皮蛋壳表面红色斑块物质组成成分,为控制红斑生成提供理论依据。方法 采用场发射扫描电镜(scanning electron microscope, SEM)、X射线衍射仪(X-ray diffractometer, XRD)、X射线电子能谱仪(X-ray photo-electron spectroscopy, XPS)分析皮蛋壳表面红色斑块的微观结构和化学成分。结果 皮蛋壳表面红色斑块物质是大块片状物附着在粗糙的碳酸钙晶体外层,蛋壳气孔也被块状异物堵塞,XPS检测出红斑由C、O、N、Fe、Cu、S、Mg等元素组成,Fe元素含量低,未检出Pb元素;XRD分析确定红斑的主要物质是CuO,红斑外层Cu~+因氧化而成Cu。结论 皮蛋壳表面红色斑块主成分为CuO。采取鸭蛋消毒控菌,低温避光腌制或许可控制蛋壳红斑形成。

Objective To analyze and identify the components of red patch on preserved egg shell surface, and provide theoretical basis for controlling the formation of red spots. Methods The microstructure and chemical composition of red patches on preserved egg shell surface were analyzed by field emission scanning electron microscope(SEM), X-ray diffractometer(XRD) and X-ray photo-electron spectroscopy(XPS). Results The red spots on eggshell were large sheets attached to the rough outer layer of calcium carbonate crystals and eggshell stomata were also blocked by lumpy foreign bodies, XPS detected that the red patches was composed of C, O, N, Fe,Cu, S, Mg and other elements. The content of Fe was low, and Pb was not detected. XRD analysis showed that the main substance of red patches was CuO, and the outer layer of red patches Cuwas oxidized to form Cu.Conclusion The main component of red patch on preserved egg shell surface is CuO. Adopting disinfection and control bacteria of duck eggs and curing at low temperature and avoiding light may control the formation of red patch on preserved eggs shell surface.