Abstract
The eggshell of the hen is an important structure which provides protection for the developing chick, and also a container for the egg in the food industry. Egg breakage can reach up to 10% of total egg production, causing considerable economic losses. The eggshell consists of membranes, composed mainly of proteins, and the mineral shell composed mainly of the calcite polymorph of CaCO3. The average CaCO3 content of a chicken eggshell is between 93 and 97%, depending on animal genotype, age, housing system of laying hens and mineral nutrition. In the present study, eggs of the same breed and approximately same age were collected from four different production systems: organic farming, free-range production, deep litter system and battery cage system. The CaCO3 content was determined by the standard titration method and by atomic absorption spectroscopy. Thermal properties of dried eggshell powder were measured by thermogravimetric measurements between 30 and 900 °C in air, showing a significant mass loss of ≈ 43% between 600 and 850 °C corresponding to the decomposition of CaCO3 to CaO and CO2. The relations between the thermal mass loss and CaCO3 content determined by the titration method/atomic absorption spectroscopy were studied using predictive models fitted by the linear regression method. A good prediction ability with an average prediction error of 0.01% was obtained between CaCO3 determined by titration and the thermal mass loss, indicating that TG could provide a reliable method for evaluation of CaCO3 content in eggshells.
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Kristl, M., Jurak, S., Brus, M. et al. Evaluation of calcium carbonate in eggshells using thermal analysis. J Therm Anal Calorim 138, 2751–2758 (2019). https://doi.org/10.1007/s10973-019-08678-8
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DOI: https://doi.org/10.1007/s10973-019-08678-8