Which of the following component in starch is water insoluble?

Options

A. Amylose
B. Glycogen
C. Amylopectin
D. Cellulose

Answer

To determine which component of starch is water insoluble, we need to analyze the two main components of starch: amylose and amylopectin.

### Step-by-Step Solution:

1. **Identify the Components of Starch**:
- Starch is made up of two main components: amylose and amylopectin.

2. **Understand the Structure of Amylose**:
- Amylose consists of long, unbranched chains of α-D-glucose units connected by glycosidic bonds (specifically C1-C4 linkages).
- Amylose is known to be water soluble due to its linear structure, which allows it to interact with water molecules.

3. **Understand the Structure of Amylopectin**:
- Amylopectin, on the other hand, is a branched polymer of α-D-glucose. It contains both linear chains (C1-C4 linkages) and branching points (C1-C6 linkages).
- The branched structure of amylopectin makes it more complex and less soluble in water compared to amylose.

4. **Determine Water Solubility**:
- Since amylose is water soluble and amylopectin is water insoluble, we conclude that the component of starch that is water insoluble is amylopectin.

5. **Final Answer**:
- The component in starch that is water insoluble is **amylopectin**.