BCH210H1 Lecture 23: 1 - Dr. Patterson_s Section Notes
13 Nov 2015
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BCH210H1 Full Course Notes
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L-isomer: oh on left side of chiral center carbon. D-isomer: oh on right of chiral center carbon: dihydroxyacetone: has a ketone group and is a ketose sugar, recap: ketone group = ketose sugar vs. aldehyde group = aldose sugar, chirality is present! Carbonyl grabs h+ from water to form new oh group. D-glucopyranose oh group pointing down on c1 attacked from the top. D-glucopyranose oh group pointing up on c1 attacked from the bottom: the two forms are interconverting. Epimers differ at one asymmetric carbon (ex// if oh is on right or left, d vs. l) ~66% , 33% and 1% linear. Figure b) five different sugars linked to asn via the n-glycosidic bond: sugars themselves linked through different bonds ( vs. o-glycosidic bonds) Look at anomeric c and see if it"s or , then see what sugar is involved. Ex// glucose glycosyl: indicate the #s of carbons in the linkage, look at configuration of the 2nd sugar.
