香港美食推薦

標題:

我想知道雞蛋殼的表面有什麼化學物質呀???

發問:

如題... 唔該哂.....

最佳解答:

Calcium carbonate (CaCO3) from wikipedia.org Birds are known for their hard-shelled eggs. The eggshell is approximately 95% calcium carbonate crystals, which are stabilized by a protein matrix. Without the protein, the crystal structure would be too brittle to keep its form. The standard bird eggshell is a semipermeable membrane filled with thousands of pores and covered on its outer surface with a cuticle, which helps the egg retain its water and keep out bacteria. As an egg develops within a bird's reproductive system, the shell is laid down as a liquid mineral layer around the already-formed extraembryonic membranes. This takes place in a part of the bird's oviduct which is called the uterus and serves a very different purpose from the uterus of a mammal. The shell is laid down by shell glands. In an average laying hen, the process of shell formation takes around 20 hours. Pigmentation is added to the shell, coloring it any of a variety of colors and patterns depending on species. The waxy cuticle is deposited on the shell in the vagina of the bird's oviduct. The chick has an egg-tooth which it uses to start a hole in the hard eggshell to allow it to hatch

• 選中學!!
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• 選中學!!
• aTV 1月18日-5 個半a餐-街頭醫生
• 貓雀能否和平共處？

 

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其他解答:

Calcium Carbonate CaCO3(s)|||||雞蛋殼絕大部分是碳酸鈣(95%)。碳酸鈣溶於醋﹐不溶於水。