00:01
Let's talk about starch and cellulose and compare their differences.
00:07
But just to review, polysaccharides are the most abundant carbohydrates in nature, and they serve a variety of functions, like energy storage or as components of plant cell walls.
00:20
Polysaccharides are very large polymers composed of tens of thousands of monosaccharides joined together by glycositic linkages.
00:27
The three most abundant polysaccharides are starch, glycogen, and cellulose.
00:33
But we are going to compare starch and cellulose.
00:41
Make sure you spell that correctly.
00:45
There we go.
00:46
So starch and cellulose.
00:49
So to begin with starch.
00:51
Starch is the most important source of carbohydrates in our diet.
00:55
It accounts for more than 50 % of our carbohydrate intake.
00:58
Starch occurs in plants in the form of granules and it's particularly abundant in seeds like wheat and rice like the cereal grains and tubers like potatoes and they serve as a storage form of carbohydrates so we often think of adding starchy foods to our diet again that's going to be like potatoes corn rice and then we'll see commercial starch as a white powder starch is highly brandy and in the human body, we have several enzymes known as amylase that degrade the starch sequentially into usable glucose units.
01:44
So hydrolysis of starch yields glucose.
01:48
First, it starts as starch breaks down to dextrins, then maltose, and then glucose.
01:55
And that glucose is then usable by our body.
01:59
And so starch is highly brand.
02:03
Now, if we looked at cellulose, cellulose is a fibrous carbohydrate that is found in all plants.
02:12
It's the structural component of plant cell walls.
02:16
It is the most abundant of all carbohydrates, accounting for over 50 % of all the carbon found in the vegetable kingdom, because the earth is covered with vegetation.
02:26
There are vast areas with the exception of antarctica that just have vegetation...