Evaluation of egg yolk colour
We compare visual evaluation of yolk colour estimated by the usual method applying La Roche scale with spectrophotometric determination of β-carotene by AOAC method, and by new rapid analyser iCheckTM Egg photometer (BioAnalyt). The eggs under consideration were purchased on a current Czech market....
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Czech Academy of Agricultural Sciences
2014-06-01
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| Series: | Czech Journal of Food Sciences |
| Subjects: | |
| Online Access: | https://cjfs.agriculturejournals.cz/artkey/cjf-201403-0002_evaluation-of-egg-yolk-colour.php |
| Summary: | We compare visual evaluation of yolk colour estimated by the usual method applying La Roche scale with spectrophotometric determination of β-carotene by AOAC method, and by new rapid analyser iCheckTM Egg photometer (BioAnalyt). The eggs under consideration were purchased on a current Czech market. The eggs originated from various countries and various types of breeding including some specialities. The yolk colour varied between the values of 4-13 of La Roche scale. The carotenoid content expressed as β-carotene measured by AOAC method varied between 11-87 mg/kg. The carotenoid content expressed as β-carotene measured with the analyser iCheckTM Egg photometer was lower and varied between 7.5-68.5 mg/kg. The correlation between the colour hue measured visually and the carotenoid content was not proved. Slovak eggs from cages which contained 28.3 mg carotenoids in 1 kg of yolk had the darkest yolks (value 13), Czech bio eggs which contained 20.2 mg carotenoids in 1 kg of yolk had the palest yolks (value 6). The highest content of carotenoids was found in eggs from home hen breeding (72.5 mg carotenoids in 1 kg of yolk) whose colour hue had the value of 10. |
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| ISSN: | 1212-1800 1805-9317 |