According to Chapter 11, precipitation strategy is best described as:

Question

BlackTom AI · Accepted Answer

Precipitate the antibody as the primary capture mechanism.

1) Relevant knowledge points and concepts
- Precipitation in downstream bioprocessing can be used either to remove impurities (impurity precipitation) or to selectively aggregate the product (product precipitation/capture).
- As a capture step, precipitation intentionally causes the antibody to form a solid phase that can be separated (centrifugation/filtration), concentrating product and removing many soluble impurities.
- Capture vs polishing: capture is an early, high-throughput step to reduce load on later purification; polishing is a final, high-resolution step to remove closely related impurities.

2) Step-by-step reasoning process
- Chapter 11 emphasizes using precipitation as a primary capture strategy when it is desirable to shift the antibody into a solid phase for bulk separation.
- Practical steps: add precipitant (e.g., PEG, salts, low pH) under controlled conditions → antibody aggregates/precipitates → separate solids by centrifugation or depth filtration → wash solids to remove residual impurities → resolubilize antibody for subsequent chromatographic polishing.
- This approach reduces volume, lowers downstream chromatographic load, and can be cost-effective and scalable.

3) Calculations/intermediate steps
- No numeric calculation is needed for selection of strategy; reasoning is conceptual and process-flow based. If optimizing, one would titrate precipitant concentration and measure yield and purity at each step.

4) Why the correct answer is correct
- The chosen option directly matches the capture-mode description: intentionally precipitating the antibody as the primary means to capture and concentrate product early in the process. Chapter 11 highlights this as a distinct strategy from impurity-targeted precipitation or polishing.

5) Why the other options are incorrect
- "Use precipitation mainly as a high-resolution polishing step": precipitation is typically low-resolution and unsuitable for fine separation of closely related variants.
- "Remove DNA and HCP while leaving the antibody in the supernatant": that describes impurity precipitation (product stays soluble), not the antibody-capture strategy.
- "Use precipitation primarily to increase chromatographic resolution and separate variants": precipitation does not increase chromatographic resolution; it’s a bulk separation method.

6) Conclusion
The best description per Chapter 11 is to precipitate the antibody as the primary capture mechanism, which matches the provided correct answer.

According to Chapter 11, precipitation strategy is best described as:单项选择题

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A UF/DF step before Protein A. Which statement is NOT correct?

In an alternative placement described in Chapter 11.4, precipitation is introduced to replace polishing steps, but it has challenges. Which statement is NOT consistent with Chapter 11.4?

Adding precipitating agent after the cells have been removed has added value because it can:

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A UF/DF step before Protein A. Which statement is NOT correct?

A UF/DF step before Protein A is most justified when:

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According to Chapter 11, precipitation strategy is best described as:单项选择题

类似问题

A UF/DF step before Protein A. Which statement is NOT correct?

In an alternative placement described in Chapter 11.4, precipitation is introduced to replace polishing steps, but it has challenges. Which statement is NOT consistent with Chapter 11.4?

Adding precipitating agent after the cells have been removed has added value because it can:

For maximum removal of nonspecifically bound material, the intermediate wash pH should be:

As cell-culture titers increase, which statement is NOT consistent with the passage?

A UF/DF step before Protein A. Which statement is NOT correct?

A UF/DF step before Protein A is most justified when:

You run a gel after a purification experiment. This gel is shown above: The lane that most likely represents your completed purification is lane ____________ This lane would correlate with a ____________ in specific activity.

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希望你的学习变得更简单

You run a gel after a purification experiment. This gel is shown above: The lane that most likely represents your completed purification is lane This lane would correlate with a in specific activity.