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Which of the following immobilized organism is not used to produce lactases?

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Which of the following immobilized organism is not used to produce lactases?

(a) Kluyveromyces lactis

(b) Mortierella vinacea

(c) Aspergillus Niger

(d) Aspergillus Oryzae

This question was posed to me during an internship interview.

My query is from High Fructose Corn Syrups and use of Immobilized Raffinase, Invertase and Lactase in division Immobilized Enzymes and their Uses of Enzyme Technology

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Right answer is (b) Mortierella vinacea

To explain I would say: Immobilized Mortierella vinacea produces raffinase which helps in the removal of raffinose. Kluyveromyces lactis is immobilized on cellulose triacetate fibers in batch wise stir tanked reactor to produce lactase. Aspergillus Niger, Aspergillus Oryzae are immobilized porous silica using glutaraldehyde and γ-aminopropyltriethoxysilane in a packed bed reactor to produce lactases.

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