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Which of the following is not a foaming agent?

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Which of the following is not a foaming agent?

(a) Sodium lauryl sulfate

(b) Ammonium lauryl sulfate

(c) Titanium hydride

(d) Pluronic f-68

I had been asked this question in an internship interview.

My query is from Medium Optimization topic in chapter Introduction to Fermentation Processes & Media for Industrial Fermentation of Bioprocess Engineering

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Correct option is (d) Pluronic f-68

To elaborate: Pluronic F68 is used in cell culture as a stabilizer of cell membranes protecting from membrane shearing and additionally acts as an anti-foaming agent.

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