curprev06:4906:49, 19 May 2023 2402:3a80:19e1:f5c5::2talk 21,816 bytes+543 →References: Thisbe K. Lindhorst (2007). Essentials of Carbohydrate Chemistry and Biochemistry (1 ed.). Wiley-VCH. ISBN 3-527-31528-4. John F. Robyt (1997). Essentials of Carbohydrate Chemistry (1 ed.). Springer. ISBN 0-387-94951-8. Pubchem. "D-Psicose". pubchem.ncbi.nlm.nih.gov. Retrieved 2018-04-26. Robert Thornton Morrison and Robert Neilson Boyd (1998): Organic Chemistry, 6th edition. ISBN 9780138924645 George U. Yuen and James M. Sugihara (1961): "". Journal of Organic Chemistry,...undoTags: RevertedMobile editMobile web edit
curprev06:4906:49, 19 May 2023 2402:3a80:19e1:f5c5::2talk 21,273 bytes+503 →Deoxyhexoses: The term "hexose" may sometimes be used to include the deoxyaldohexoses, which have one or more hydroxyls (–OH) replaced by hydrogen atoms (–H). It is named as the parent hexose, with the prefix "x-deoxy-", the x indicating the carbon with the affected hydroxyl. Some examples of biological interest are l-Fucose (6-deoxy-l-galactose) l-Rhamnose (6-deoxy-l-mannose) d-Quinovose (6-deoxy-d-glucose), found as part of the sulfolipid sulfoquinovosyl diacylglycerol (SQDG) l-Pneumos...undoTags: RevertedMobile editMobile web edit
curprev06:4806:48, 19 May 2023 2402:3a80:19e1:f5c5::2talk 20,770 bytes+548 →Natural occurrence and uses: The aldohexose that is most important in biochemistry is d-glucose, which is the main "fuel" for metabolism in many living organisms. The 2-ketohexoses psicose, fructose and tagatose occur naturally as the d-isomers, whereas sorbose occurs naturally as the l-isomer. d-Sorbose is commonly used in the commercial synthesis of ascorbic acid.[10] d-Tagatose is a rare natural ketohexose that is found in small quantities in food.[11] d-Fructose is responsible for t...undoTags: RevertedMobile editMobile web edit
curprev06:4806:48, 19 May 2023 2402:3a80:19e1:f5c5::2talk 20,222 bytes+439 →Chemical properties: Although all hexoses have similar structures and share some general properties, each enantiomer pair has its own chemistry. Fructose is soluble in water, alcohol, and ether.[9] The two enantiomers of each pair generally have vastly different biological properties. 2-Ketohexoses are stable over a wide pH range, and with a primary pKa of 10.28, will only deprotonate at high pH, so are marginally less stable than aldohexoses in solution.undoTags: RevertedMobile editMobile web edit
curprev06:4706:47, 19 May 2023 2402:3a80:19e1:f5c5::2talk 19,783 bytes+1,434 →Cyclic forms: Like most monosaccharides with five or more carbons, each aldohexose or 2-ketohexose also exists in one or more cyclic (closed-chain) forms, derived from the open-chain form by an internal rearrangement between the carbonyl group and one of the hydroxyl groups. The reaction turns the =O group into a hydroxyl, and the hydroxyl into an ether bridge (–O–) between the two carbon atoms, thus creating a ring with one oxygen atom and four or five carbons. If the cycle has five ca...undoTags: RevertedMobile editMobile web edit
curprev06:4506:45, 19 May 2023 2402:3a80:19e1:f5c5::2talk 18,349 bytes+489 →Ketohexoses: A ketohexose is a ketone-containing hexose.[1][2][7] The important ketohexoses are the 2-ketohexoses, and the most important 2-ketose is fructose. Besides the 2-ketoses, there are only the 3-Ketoses, and they do not exist in nature, although at least one 3-ketohexose has been synthesized, with great difficulty. In the linear form, the 2-ketohexoses have three chiral centers and therefore eight possible stereoisomers (23), comprising four pairs of enantiomers. The four d-iso...undoTags: RevertedMobile editMobile web edit
curprev06:4406:44, 19 May 2023 2402:3a80:19e1:f5c5::2talk 17,860 bytes+439 →Aldohexoses: The aldohexoses are a subclass of the hexoses which, in the linear form, have the carbonyl at carbon 1, forming an aldehyde derivative with structure H–C(=O)–(CHOH)5–H.[1][2] The most important example is glucose. In linear form, an aldohexose has four chiral centres, which give 16 possible aldohexose stereoisomers (24),comprising 8 pairs of enantiomers. The linear forms of the eight d-aldohexoses, in the Fischer projection, areundoTags: RevertedMobile editMobile web edit
curprev06:4406:44, 19 May 2023 2402:3a80:19e1:f5c5::2talk 17,421 bytes+867 In chemistry, a hexose is a monosaccharide (simple sugar) with six carbon atoms.[1][2] The chemical formula for all hexoses is C6H12O6, and their molecular weight is 180.156 g/mol.[3] d-Glucose. d-Fructose. Two important hexoses, in the Fischer projection. Hexoses exist in two forms, open-chain or cyclic, that easily convert into each other in aqueous solutions.[4] The open-chain form of a hexose, which usually is favored in solutions, has the general structure H–(CHOH)n−1–C(=O)–(CHOH)4−n–...undoTags: RevertedMobile editMobile web edit
curprev18:4618:46, 9 February 2020 BiosocialPolymathtalkcontribs m16,805 bytes+319 →2-Ketohexoses: missing "carbonyl" at the 2 position. rewrote for clarity with a general audience in mind rather than copy-paste Franken–writing. Referenced IUPAC with brief explanation instead of using "Formally". Will make a linear diagram of fructose showing the carbonyl for clarity and consistence with the others.undo
