Pyridinium is the cationic conjugate acid of pyridine. This can either be due to protonation of the ring nitrogen or because of addition of a substituent to the ring nitrogen, typically via alkylation. The lone pair of electrons on the nitrogen atom of pyridine is not delocalized, and thus pyridine can be protonated easily. Pyridine is often used ...
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Type: Term Pronunciation: pir′i-din′ē-ŭm Definitions: 1. A breakdown product of bone collagen, excreted in urine, and assayed as a measure of osteoclast activity; increased in disease states such as Paget disease, primary hyperparathyroidism, and postmenopausal osteoporosis.
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