Nonose
{{Short description|Class of carbohydrate}}
{{For|the medical condition|Arrhinia}}
A nonose is a monosaccharide with nine carbons.Paul G. Engelkirk and Gwendolyn R. Wilson Burton. (2006) [https://books.google.com/books?id=KjXLbjzTq9EC&pg=PA92&dq=Nonose+neuraminic+acid.#PPA92,M1 Burton's microbiology for the health sciences], p. 92. {{ISBN|978-0-7817-7195-5}}{{cite web|url=https://medical-dictionary.thefreedictionary.com/nonose|title=Nonose}}
Nonoses types
Depending on the position of the functional groups, a distinction is made between ketononoses and aldononoses.
Aldononoses have seven chiral centers, which allows the formation of 128 stereoisomers (27), which differ in the position of the hydroxyl groups or the asymmetric carbon atom. Ketononoses have six chiral centers, which gives the possibility of 64 different possible stereoisomers.