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Which of the following is not a component of downstream processing?

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Purification

Separation

Preservation

Expression

answer is D.

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Detailed Solution

Expression is not a component of downstream processing.

Expression of the desired product (r-enzyme or r-protein) is part of upstream processing, which is the first segment of bioprocessing.

(1) Downstream processing involves separation, extraction and purification of the product. So, separation is the first step of downstream processing.

(2) In downstream processing, purification comes after separation of the product.

(3) Addition of preservatives is part of formulation of the purified product. The goal of formulation is to stabilise the product and extend its shelf life.

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