Which of the following statements is incorrect with respect to pectinases ?

Options

A. they are used in clearing of fruit juices
B. they are used in chill-profing beer and whisky
C. they are obtained from Byssoclamys fulva
D. they are used in retting of fibers

Answer

To determine which statement about pectinases is incorrect, let's analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Pectinases**:
- Pectinases are enzymes that break down pectin, a polysaccharide found in plant cell walls. They play a crucial role in various industrial processes.

2. **Analyzing Option A**:
- **Statement**: "They are used in clearing of fruit juices."
- **Evaluation**: This statement is correct. Pectinases are indeed used in the extraction and clarification of fruit juices by breaking down pectin, which helps in the removal of cloudiness.

3. **Analyzing Option B**:
- **Statement**: "They are used in chill proofing beer and whiskey."
- **Evaluation**: This statement is incorrect. While pectinases are used in various applications, chill proofing of beer and whiskey is typically done using other enzymes like Ficin and Papain, not pectinases.

4. **Analyzing Option C**:
- **Statement**: "They are obtained from Bischofit."
- **Evaluation**: This statement is correct. Pectinases can be derived from various sources, including certain fungi and bacteria, but Bischofit (Bischofite) is not a common source for pectinases.

5. **Analyzing Option D**:
- **Statement**: "They are used in retting of fibers."
- **Evaluation**: This statement is correct. Pectinases are used in the retting process to break down pectin in plant fibers, facilitating the separation of fibers from the plant material.

### Conclusion:
After evaluating all the statements, the incorrect statement regarding pectinases is **Option B**: "They are used in chill proofing beer and whiskey."