Title: Exergetic growth efficiency of Kluyveromyces fragilis on complex organic and minimal inorganic media

Authors: Mustafa Özilgen

Addresses: Department of Food Engineering, Yeditepe University, 34755, Kayısdagi, Atasehir, Istanbul, Turkey

Abstract: Kluyveromyces fragilis is the kefir yeast; it has been renamed and taxonomically reclassified many times during the recent decades. Exergetic efficiency of cultivation of Kluyveromyces fragilis on glucose or lactose containing complex organic and minimal inorganic media has been evaluated. Although the maximum cellular mass was produced in the complex organic media, exergetic efficiency of cultivation was higher in the minimal inorganic media. Crabtree effect was thought to reduce the exergetic efficiency in the glucose containing organic medium, such an effect was not observed in the glucose containing minimal inorganic medium. Exergetic efficiency was the highest, 61.2%, in the glucose containing minimal inorganic medium and the lowest, 24%, in the glucose containing minimal organic medium.

Keywords: Kluyveromyces fragilis; minimal inorganic media; complex organic media; exergy efficiency; Crabtree effect.

DOI: 10.1504/IJEX.2023.129800

International Journal of Exergy, 2023 Vol.40 No.3, pp.336 - 346

Received: 03 Feb 2022
Received in revised form: 11 Aug 2022
Accepted: 13 Aug 2022
Published online: 30 Mar 2023 *

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