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Eggshell membrane or shell membrane is the clear film lining eggshells, visible when one peels a boiled bird egg. Chicken eggshell membranes are used as a dietary supplement . Eggshell membrane is derived commercially from the eggshells of industrial processors.
While the bulk of eggshell is made of calcium carbonate, it is now thought that the protein matrix has an important role to play in eggshell strength. [13] These proteins affect crystallization, which in turn affects the eggshell structure. The concentration of eggshell proteins decreases over the life of the laying hen, as does eggshell strength.
The color eggshell is meant as a representation of the average color of a chicken egg. In interior design , the color eggshell is commonly used when one desires a pale, warm, neutral, off-white color.
Eggshell membrane separation is a recycling process to separate the protein-rich eggshell membrane from the eggshell. Nearly 30% of the eggs consumed each year are broken and processed or powdered into foods such as cakes, mixes, mayonnaise, noodles and fast foods. [1] The US food industry generates 150,000 tons of shell waste a year. [2]