Quality assessment of chicken eggshell cuticle by infrared spectroscopy and staining techniques: a comparative study

ABSTRACT

1. The cuticle is a very thin organic layer that coats the eggshell surface and plugs the eggshell pores preventing bacterial penetration. It also reduces eggshell permeability which is important to maintain internal quality of the egg. Thus, the eggshell cuticle quality is crucial to ensure the food safety and quality of eggs.

2. A new methodology to assess eggshell cuticle quality, based on attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR), is compared with a more traditional method based on cuticle staining techniques.

3. Both techniques are useful to determine the amount of cuticle; however, the ATR-FTIR technique is independent of egg colour, more sensitive and provides complete information about the cuticle and its composition. Additionally, it provides information about eggshell permeability.

4. The methodology for cuticle quality assessment described in this work can be very useful for genetic selection programmes aimed to improve the safety and quality of eggs.

KEYWORDS:

• ATR-FTIR
• calcite
• cuticle
• eggshell
• food safety

Acknowledgements

The authors thank Avícola Garrido-García for providing fresh eggs and Bendición Funes, Alicia González and Rocío Márquez (Universidad de Granada) for their assistance with analyses.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors are grateful for financial support through grants: CGL2011-25906; CGL2015-64683-P (Ministerio de Economía y Competitividad) and RNM-179 research group (Junta de Andalucía).