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For example, the yellow color of chicken egg yolks, fat, and skin comes from ingested xanthophylls—primarily lutein, which is added to chicken feed for this purpose. The yellow color of the macula lutea (literally, yellow spot) in the retina of the human eye results from the presence of lutein and zeaxanthin. Again, both these specific ...
The color of an egg yolk is directly influenced by the makeup of the chicken feed. [22] Egg yolk color is generally more yellow when given a feed containing a large component of yellow, fat-soluble pigments, such as the carotenes in dark green plant material, for example alfalfa. Although much emphasis is put onto the color of the egg yolk, it ...
The resulting effect is a flattened and enlarged yolk shape. Yolk color is dependent on the diet of the hen. If the diet contains yellow or orange plant pigments known as xanthophylls, then they are deposited in the yolk, coloring it. Lutein is the most abundant pigment in egg yolk. [27]
The yolk-based egg washes had wildly different results because of the high amount of fat in the yolk. All four tests had no trouble browning, each with a tinge of yellow and high shine.
In the United States lutein may not be used as a food coloring for foods intended for human consumption, but can be added to animal feed and is allowed as a human dietary supplement often in combination with zeaxanthin. Example: lutein fed to chickens will show up in skin color and egg yolk color. [28] [29]
The gases react with the iron and that turns the surface of the yolk a greenish grayish color." Older eggs can also be more prone to cooking up with green yolks.
Take a closer look at the pros and cons of eating whole eggs (yolk and all!) to find out what's behind egg's bad reputation and whether you're missing out on some key nutrients.
Citranaxanthin is a carotenoid pigment used as a food additive under the E number E161i as a food coloring. There are natural sources of citranaxanthin, but it is generally prepared synthetically. [1] It is used as an animal feed additive to impart a yellow color to chicken fat and egg yolks. [2]
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