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Which of the following is not a gel filtration chromatography?

(a) Molecular sieve

(b) Gel permeation

(c) Size exclusion

(d) Gel residue

I had been asked this question in an internship interview.

This intriguing question comes from Fermentation Products Recovery and Purification topic in division Recovery and Purification of Fermentation Products, Effluent Treatment, Bioreactor Design Considerations of Fermentation Technology

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Right option is (d) Gel residue

To elaborate: The gel filtration chromatography is also called molecular sieve chromatography, gel permeation chromatography, size exclusion chromatography, gel filtration chromatography, or gel chromatography. Gel residue is not a gel filtration chromatography.

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