Carbohydrates (Part 3 of 4) - Disaccharides and Polysaccharides

Moof's Medical Biochemistry Video Course: moof-university...
For Related Practice Problems with Worked Video Solutions on Carbohydrates, visit courses.moofuniversity.com.
In this video, I depict and describe some key disaccharides and polysaccharides that any and every biochemistry student should be familiar with.
Maltose is a disaccharide with two glucose molecules connected by an alpha-1,4-glycosidic bond. Maltose is a reducing sugar because it has a free anomeric OH group.
Lactose is a disaccharide with a galactose and a glucose connected by a beta-1,4-glycosidic bond. Lactose is a reducing sugar because it has a free anomeric OH group.
Sucrose is a disaccharide with a glucose and a fructose connected by an alpha,beta-1,2-glycosidic bond. Sucrose is not a reducing sugar because it does not have a free anomeric OH group.
Cellulose is a polysaccharide with a bunch of glucose molecules connected by beta-1,4-linkages.
Starch and glycogen are both polysaccharides with a bunch of glucose molecules connected by alpha-1,4-linkages. Glycogen is more highly branched.
Humans have the enzyme to digest alpha-1,4-linkages, not beta-1,4-linkages. That’s why we can digest starch and glycogen, but not cellulose.
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[@ZW716]

Really liking these videos! In a Biochemistry course and it's so condensed and sped up. These videos really help slow things down and help me understand it better.

[@danng8376]

Thank you for making these videos. Please continue to make more!

[@MoofUniversity]

You're very welcome! I will make more; I promise. I've just been busy. More are coming for sure, though.

[@theonlysnail]

Really nice video. Just wanted to also point out that your structure for starch/glycogen is bit incomplete- you drew out the structure of alpha-amylose, which indeed is a straight chain of alpha(1,4) linkages, but there's also amylopectin, which contains alpha(1,6) branch points. Just an important detail I thought you missed, since starch and glycogen differ in where these branch points occur.

[@bonybhar9538]

excellent work... sir

[@khayyam3000]

Great Video!!!

[@hamilpatel4025]

I thought cellulose was alpha-beta-alpha-beta... if I'm wrong, do you recall what polysaccharide is a-b-a-b..?

[@nyawirawaithaka4993]

Thank you!

[@haddadmj96]

You're awesome!!

[@mlakal7ob5]

thanq u r very helpful .. Can u upload the file that u r wrote it for each part that u did discusse .. please Moof University

[@eshandabhade3060]

isnt maltose supposed to be 2 Alpha D glucose

[@MoofUniversity]

Eshan Dabhade That's alpha maltose. I've drawn beta maltose.

[@eshandabhade3060]

ok. thank you for clarifying!

[@MoofUniversity]

Eshan Dabhade Sure thing!

[@caniko2]

Examples for cellulose could have been salad, or tomatoes, onions... I am not sure if I can say vegitables

[@nghitran1395]

I thought Maltose is alpha-D-glucose and alpha-D-glucose.