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Biochemistry

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Know Your Polyols (Sugar Alcohols)

BIOCHM-3U@PGU

Polyols are sugar alcohols, the reduced form of an aldose or ketose sugar, and common dietary sweeteners. Various polyols are synthesized as natural products of photosynthesis and often times serve as compatible solutes protecting against stress. In other cases, the accumulation of polyols, e.g., sorbitol, by people with diabetes can lead to eye and peripheral nerve damage.

The following D-aldose sugars can all form polyols upon reduction of their aldehyde functional group.

Consider each of these sugars and then identify which of the following does NOT correctly show the structure of a polyol formed from these sugars.

Uegly, Master. "D-Glyceraldehyde 2D Fischer." Wikimedia Commons. N.p., 5 May 2015. Web. 22 May 2016. NEUROtiker. "Alpha-D-Ribofuranose." Wikimedia Commons. N.p., 23 Mar. 2007. Web. 22 May 2016. NEUROtiker. "Beta-D-Glucopyranose." Wikimedia Commons. N.p., 14 Mar. 2007. Web. 22 May 2016. NEUROtiker. "Beta-D-Galactopyranose." Wikimedia Commons, 16 Mar. 2007. Web. 22 May 2016. NEUROtiker. "Alpha-D-Mannopyranose." Wikimedia Commons. N.p., 14 Mar. 2007. Web. 21 May 2016.

A

NEUROtiker. Wikimedia Commons, 27 Apr. 2007. Web. 22 May 2016.

B

M. Rumpho-Kennedy. Created for Albert.io. Copyright 2016. All rights reserved.

C

M. Rumpho-Kennedy. Created for Albert.io. Copyright 2016. All rights reserved.

D

Su-no-G. Wikimedia Commons, 18 Jan. 2007. Web. 22 May 2016.

E

NEUROtiker. Wikimedia Commons, 27 Apr. 2007. Web. 22 May 2016.