Evaluation of egg yolk colour

• Published in: Czech Journal of Food Sciences Vol. 32; no. 3; pp. 213 - 217
• Main Authors: Bovskova, H., Institute of Chemical Technology, Prague (Czech Republic). Dept. of Food Analysis and Nutrition, Mikova, K., Institute of Chemical Technology, Prague (Czech Republic). Dept. of Food Analysis and Nutrition, Panovska, Z., Institute of Chemical Technology, Prague (Czech Republic). Dept. of Food Analysis and Nutrition
• Format: Journal Article
• Language: English
• Published: Prague Czech Academy of Agricultural Sciences (CAAS) 01-01-2014; Czech Academy of Agricultural Sciences
• Subjects: AGRICULTURA BIODINAMICA; AGRICULTURE BIODYNAMIQUE; analyser ichecktm egg photometer; ANIMAL PRODUCTS; BIODYNAMIC AGRICULTURE; Breeding; CAGE CULTURE; CALIDAD; Carotene; carotenoid determination; CAROTENOIDE; CAROTENOIDES; CAROTENOIDS; CHEMICAL COMPOSITION; COLOR; COLOUR; COMPORTAMIENTO DEL CONSUMIDOR; COMPORTEMENT DU CONSOMMATEUR; COMPOSICION QUIMICA; COMPOSITION CHIMIQUE; CONSUMER BEHAVIOUR; Correlation analysis; COULEUR; CRIANZA EN CAMA PROFUNDA; CULTIVO EN JAULAS; CULTURE EN CAGE; CZECH REPUBLIC; DEEP LITTER HUSBANDRY; EGG YOLK; EGGS; ELEVAGE SUR LITIERE PROFONDE; ESPAGNE; ESPANA; ETIQUETADO DEL PRODUCTO; ETIQUETAGE DES PRODUITS; Evaluation; FACTEUR PSYCHOLOGIQUE; FACTORES PSICOLOGICOS; GALLINA PONEDORA; HONGRIE; HUEVOS; HUNGARY; HUNGRIA; JAUNE D'OEUF; LAYER CHICKENS; OEUF; ORGANOLEPTIC PROPERTIES; Photometers; PHYSIOLOGIE SENSORIELLE; POLAND; POLOGNE; POLONIA; POULE PONDEUSE; PROCEDENCIA; PRODUCT LABELLING; PRODUCTOS DE ORIGEN ANIMAL; PRODUIT ANIMAL; PROPIEDADES ORGANOLEPTICAS; PROPRIETE ORGANOLEPTIQUE; PROVENANCE; PSYCHOLOGICAL FACTORS; QUALITE; QUALITY; REPUBLICA CHECA; REPUBLICA ESLOVACA; REPUBLIQUE SLOVAQUE; REPUBLIQUE TCHEQUE; SENSES; sensory visual evaluation; SENTIDOS; SLOVAK REPUBLIC; SPAIN; Spectrophotometry; YEMA DE HUEVO; Yolk; β-Carotene
• ISSN: 1212-1800; 1805-9317
• DOI: 10.17221/47/2013-cjfs

We compare visual evaluation of yolk colour estimated by the usual method applying La Roche scale with spectrophotometric determination of beta-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 beta-carotene measured by AOAC method varied between 11-87 mg/kg. The carotenoid content expressed as beta-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.