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Chemical composition of chicken eggshell and shell membranes
T Nakano1, N I Ikawa, L Ozimek
1Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton Alberta, Canada T6G 2P5. tnakano@ualberta.ca
Poultry Science
|April 23, 2003
Summary
This study confirms uronic acid in chicken eggshell membranes, finding higher concentrations in eggshell organic matter than in shell membranes. Chemical compositions differ significantly between membranes and organic eggshell matter.
Area of Science:
- Biochemistry
- Animal Science
- Materials Science
Background:
- Chicken eggshell membranes and organic matter are complex biocomposites.
- Understanding their chemical composition is crucial for applications in biomaterials and nutrition.
Purpose of the Study:
- To determine the presence and quantify uronic acid in chicken eggshell membranes.
- To compare the chemical composition of inner and outer eggshell membranes with the organic matter of the eggshell.
Main Methods:
- Chemical analysis of eggshell membranes and organic matter.
- Quantification of uronic acid, sialic acid, and nitrogen content.
- Amino acid profiling using amino acid analysis.
Main Results:
- Uronic acid was detected in chicken eggshell membranes, with higher concentrations in eggshell organic matter.
- Sialic acid was most abundant in eggshell organic matter, followed by the inner membrane.
- Nitrogen levels were lowest in eggshell organic matter, while amino acid profiles showed distinct differences, with higher glycine and alanine, and lower proline and hydroxyproline in eggshell organic matter compared to membranes.
Conclusions:
- Chicken eggshell membranes contain uronic acid, a novel finding.
- Significant variations in uronic acid, sialic acid, nitrogen, and amino acid profiles exist between eggshell membranes and organic eggshell matter.
- These compositional differences highlight distinct roles and potential applications for each component.