Write the molecular formula for a carbohydrate containing three carbons.

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Hi, everybody. Our next problem says geno bios is a disaccharide integrated into the structure of croon, the compound responsible for the color of saffron. It is composed of two glucose molecules determine the type of glyco cytic bond present in gentle bios. So our glycosite bond is that bond between the anomic carbon of one monosaccharide. And then from that anomic carbon, it is linked to another carbon on the next glucose unit. So let's see which carbons we have here. So looking at our first glucose monomer here, we see that the oxygen is linked to this right hand carbon in our ring. And this is the anomic carbon which makes sense. We know our gly acetic bond will be between the anomic carbon uh the one. So the anomic carbon is by convention, always number one. And then in our other molecule where it links is this carbon atom thats outside the ring, that C two group. And so if we number our rings starting with the anomic carbon 12345, it's obvious that this is carbon six that it's linked to. And the last thing we need to do is determine whether it's alpha or beta. So we look at the direction that what was the hydroxyl group? It's now an oxygen there. What direction is this pointing with respect to the ring? So it's above the plane of the ring. And then we look for that group on the other side of the oxygen on the ring. And that's the C H2O H that is consists of carbon six plus a hydroxyl group. We know that we designate the linkage by in parentheses. Oops excellently is my highlighter there, we have one, our anomic carbon and that will be leading to carbon six on the other ring. So we have one and an arrow six. But that in parentheses, now we just need to determine do we have an alpha or a beta linkage. So to do that, we look at the first ring and we note it has the ether linkage that was a hydroxyl group has that. So we look at where that oxygen that was in the hydroxyl group is in relation to the ring. So that oxygen on carbon one is above the plane of the ring. And then we look at that carbon six group looking to the other side of the oxygen. And it is also so since this oxygen is above the plane of the ring and the C H2O 0 group on the other side of the ring, oxygen is also above the plane of the ring, then these are on me steam side of the ring for lack of a better word. And I always remember same starts with a constant as does you know B for beta. So when they're on the same side, that is a beta. So we know that the full name of our bond is beta 1 to 6. So let's put a highlighting there for that as that is going to be the name of our gly acidic bond there. So looking here at the structure of gente oios which is composed of two glucose molecules and we need to determine the type of glyco bond linking them. And we determined that that was a beta 1 to 6 glyco bond. See you in the next video.

Write the molecular formula for a carbohydrate containing three carbons.

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Key Concepts

Carbohydrates

Molecular Formula

Triose