Disaccharides - Video Tutorials & Practice Problems
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concept
Types of Disaccharides Concept 1
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Now remember a Dy sac ride is when we have two mono sac rides connected to each other by Glyco Cytic linkage. And we're gonna say there are different types of Dy sac rides. We're gonna say many dy sac rides exist, but the most common ones are maltose, cloos, lactose and sucrose. If we take a look here at this chart, we have the two types of sugars that are involved in the creation of this particular common di saccharide. We then talk about the type of linkage that it contains, whether it be alpha or beta or a combination of the two. Then we talk about what's the name of the di disaccharide. And then finally, some common examples that might contain this disaccharide. If we take a look at the first one, we have D glucose plus D glucose, they together are gonna give me an alpha +14 linkage. When we have two D glucose molecules giving us an alpha 14 linkage. This gives us maltose as our disaccharide. And here we have an example of barley. Now maltose, you can find it in different types of beer hops. Barley, these are important ingredients that help to create different types of beer. Now, next, we again have D glucose and D glucose. OK? But what's going on here? Well, the first one dealt with alpha 14 and now we're dealing with beta 14. So the linkage here is different. In this case, this would give us subtle bios. Now, here we have a jar of honey. Honey itself is digestible by us, but it contains trace amounts of this particular dy saccharide. So this is a common everyday food that has little bits of this particular type of dy saccharide present within it. Now, next, we see that D glucose is still involved. D glucose kind of forms a foundation for a lot of these disaccharide. So now we have D glucose, but instead of having T two D glucose, we're gonna have D galactose involved. So here we're gonna say de galactose plus de glucose is gonna give us here a beta +14 linkage. And that's gonna give us lactose as our disaccharide lactose. Great example, milk milk sugar is lactose. Now, typically, human beings can't digest beta linkages, but we as human beings have lactase as an enzyme within ourselves that helps us to break down this milk sugar. Those of us who are lactose intolerant and can't digest dairy very well. It's because we have very little of this enzyme or over time it degrades and we just don't have a lot of it to help us process milk and other types of dairy products. Now, next, again, we have d glucose as our base and we're gonna have it reacting with D fructose. This would help us to create sucrose, sucrose. Here, sucrose is table sugar. And remember we've talked about sucrose, sucrose is very different from other disaccharide. Here, it has both an alpha and beta linkage. It'd be alpha one and beta two linkage. So these are our four most common types of disaccharide. And these are some common everyday examples that contain some of these common types of disaccharide.
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example
Types of Disaccharides Example 1
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50s
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Video transcript
Here in this example, it says which of the following contains galactose as one of the sugar subunits. All right. So first of all glucose is out because glucose is a monosaccharide. It's not gonna have another monosaccharide as a subunit. Same thing with ribose. It's a monosaccharide. This leaves either maltose lactose or, or solo bios. Maltose and cellos are out because both of them have d glucose as their sub units where say here that maltose would have them as an alpha 14 linkage and this one would have it as a beta 14 linkage. This leaves D as our only answer, lactose possesses the glucose and D galactose that together form a beta 14 linkage. Remember lactose or milk sugar is a common type of disaccharide.
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Problem
Problem
Which disaccharide forms a 1,1-glycosidic linkage?