Addition of antibiotics in chemical engineering process helps in

Options

A. Mixing and aeration of media
B. Maintaining anti-foaming conditions
C. Maintaining aseptic conditions
D. Maintainance of constant temperature and Ph

Answer

### Step-by-Step Solution:

1. **Understanding the Context**: The question pertains to the role of antibiotics in chemical engineering processes, specifically within the context of pharmaceutical biotechnology and downstream processing.

2. **Identifying the Process**: The chemical engineering process being referred to is downstream processing, which occurs in a bioreactor. This is where the host cells are cultured with the media containing the recombinant DNA (rDNA).

3. **Analyzing the Options**: The options provided are:
- Mixing and aeration of media
- Maintaining anti-foaming condition
- Maintaining aseptic condition
- Maintaining constant temperature and pH

4. **Evaluating Each Option**:
- **Mixing and Aeration**: This process is facilitated by mechanical components like impellers and spargers. Antibiotics do not play a role in this function.
- **Maintaining Anti-Foaming Condition**: While baffles can reduce foam, antibiotics are not primarily used for this purpose.
- **Maintaining Aseptic Condition**: This is the primary role of antibiotics in the bioreactor. They prevent the growth of unwanted microorganisms, ensuring that only the desired host cells proliferate.
- **Maintaining Constant Temperature and pH**: These parameters are controlled by instruments like thermometers and pH meters, not antibiotics.

5. **Conclusion**: The correct answer is that the addition of antibiotics in the chemical engineering process helps in maintaining aseptic conditions by preventing the growth of unwanted organisms.