protopectin

[proh-tuh-pek-tin]
noun Biochemistry.
any of the class of water-insoluble pectic substances that are found in the rind of citrus fruits or in apple peels and that are hydrolyzed to pectin or pectic acid.
Also called pectinogen, pectose.


Origin:
1905–10; proto- + pectin

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Pectin is a structural polysaccharide commonly found in the form of protopectin in plant cells.
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