Immobilization of a whole cell catalyst for cellodextrin production

master's thesis

• Title (croatian): Proizvodnja celodextrina pomoću imobiliziranih stanica
• Author: Iva Čukelj
• Mentor: Anita Slavica (mentor)
• Committee member: Renata Teparić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Biochemical Engineering); (Laboratory for Biochemical Engineering, Industrial Microbiology and Malting and Brewing Technology); Zagreb
• Defense date and country: 2022-02-25, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Biotechnology

Abstract

Enzymes sucrose phosphorylase from Bifidobacterium adolescentis (BaSP), cellobiose phosphorylase from Cellulomonas uda (CuCBP) and cellodextrin phosphorylase from Clostridium cellulosi (CcCDP) were co-expressed in E. coli BL21 (DE3) -agp⁻ pPOLY_new cells and immobilized in polyacrylamide matrix (PAM) with the aim of repeated use of immobilized cells, i.e. three enzymes in the production of soluble cellodextrins (COS). Three repetitive batch experiments were performed at three different temperatures (35, 40 and 45 °C), differing in number of cycles (9, 6 and 5, respectively), duration of each cycle (8, 12 and 6 h), cell loading (63, 40, 40 mg CDW/g PAM-particles) and cell catalyst concentration (4, 3, 4 g CDW/L). The impact of these variables has been investigated and a new experimental setup for the industrial production of COS has been proposed; six repetitive batch cycles should be performed at 40 °C, with a duration of each cycle 8-10 h, with cell loading higher than 40 mg CDW/g PAM-particles, and concentration of the cell catalyst (higher than 4 g CDW/L).

Abstract (croatian)

Enzimi saharoza fosforilaza iz Bifidobacterium adolescentis (BaSP), celobioza fosforilaza iz Cellulomonas uda (CuCBP) i celodekstrin fosforilaza iz Clostridium cellulosi (CcCDP) su ko-eksprimirani u stanicama E. coli BL21 (DE3) -agp- pPOLY_new. Stanice su zatim imobilizirane u poliakrilamidnom matriksu (PAM) s ciljem ponavljajućeg korištenja imobiliziranih stanica, odnosno ova tri enzima u proizvodnji topljivih celodekstrina (COS). Proizvodnja COS pomoću PAM imobiliziranih stanica tijekom ponavljajućih šaržnih eksperimenata provedena je na tri različite temperature (35, 40 i 45 °C) s različitim brojem ciklusa (9, 6 i 5), vremenom trajanja ciklusa (8, 12 i 6 h), udjelom stanica (63, 40 , 40 mg s.t./g immobilizata) i koncentracijom stanica (4, 3 , 4 g s.t./L). Utjecaj ovih parametara je ispitan i predloženi su sljedeći uvjeti za provođenje ponavljajućih šarži za industrijsku proizvodnju COS-a; šest ponavljajućih šaržnih ciklusa treba provesti na 40 °C, s trajanjem ciklusa 8-10 h, s većim udjelom stanica u poliakrilamidnom matriksu (≥ 4 g s.t./L), i koncentracijom stanica (≥ 63 s.t./g immobilizata).

• Keywords: soluble cellodextrins; immobilization; Bifidobacterium adolescentis sucrose phosphorylase (BaSP); Cellulomonas uda cellobiose phosphorylase (CuCBP); Clostridium cellulosi cellodextrin phosphorylase (CcCDP)
• Keywords (english): topljivi celodekstrini; imobilizacija; celobioza fosforilaza iz Cellulomonas uda (CuCBP); celodekstrin fosforilaza iz Clostridium cellulosi (CcCDP); saharoza fosforilaza iz Bifidobacterium adolescentis
• Language: english
• URN:NBN: urn:nbn:hr:159:343845
• Study programme: Title: Molecular Biotechnology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka molekularne biotehnologije (magistar/magistra inženjer/inženjerka molekularne biotehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-05-27 09:20:08