Učinkovitost proizvodnje mliječne kiseline mikrobnim procesom iz različitih obnovljivih sirovina

undergraduate thesis

• Title (english): Efficency of microbial process for the production of lactic acid from different renewable raw materials
• Author: Dijana Petrić
• Mentor: Anita Slavica (mentor)
• 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: 2011-06-29, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Biotechnology

Abstract

Industrijska proizvodnja mliječne kiseline podrazumijeva dvostupanjske procese kod kojih se u prvom stupnju polimerni ugljikohidrat hidrolizira do fermentabilnih ugljikohidrata, dok se u drugom stupnju jednostavniji ugljikohidrati u hranjivoj podlozi kompleksnog sastava fermentiraju do mliječne kiseline. Drugi stupanj je mikrobni proces tijekom kojeg se proizvodi jedan ili oba stereoizomera mliječne kiseline. Učinkovitost ovih bioprocesa može se povećati ukoliko se umjesto različitih pročišćenih sastojaka, koji se dodaju u hranjivu podlogu, koriste obnovljive sirovine. Takve bioprocese proizvodnje mliječne kiseline, kod kojih je reducirana količina opreme, kemikalija i energije potrebne za proizvodnju proizvoda s dodanom vrijednošću, provode mikroorganizmi koji iskazuju hidrolitičko-fermentativni aktivnost. Učinkovitost opisanih mikrobnih procesa može se povećati objedinjavanjem procesa u kojima se iz polimernih supstrata direktno proizvodi mliječna kiselina, postupaka izdvajanja i pročišćavanja mliječne kiseline i sustava za proizvodnju biorazgradljivih polimera i ko-polimera mliječne kiseline u tzv. integrirane bioprocese („od prirodnih polimera do biorazgradljivih polimera“).

Abstract (english)

Industrial production of lactic acid comprises two-step processes in which in first step polymeric carbohydrate has been hydrolyzed to fermentable carbohydrates, while, in second step, simpler carbohydrates from complex medium have been fermented to lactic acid. The second step represents microbial process for production of one or both stereoisomers of lactic acid. Efficiency of those bioprocesses can be enhanced in cases when, instead of purified ingredients, renewable raw materials have been added to the medium. In such bioprocesses for lactic acid production, quantity of equipment, chemicals and energy required for production of value-added products, have been reduced. The bioprocesses have been usually carried out by microorganisms which posses hydrolytic and fermentative activity. Efficiency of described microbial processes can be increased by merging bioprocesses for direct production of lactic acid from polymeric substrates, processes for separation and purification of lactic acid and system for production of biodegradable lactic acid polymers and co-polymers into, so called, integrated bioprocesses („from natural polymers to biodegradable polymers“).

• Keywords: mliječna kiselina; mikrobni procesi; bakterije mliječne kiseline; obnovljive sirovine
• Keywords (english): lactic acid; microbial processes; lactic acid bacteria; renewable raw materials
• Language: croatian
• URN:NBN: urn:nbn:hr:159:895461
• Study programme: Title: Biotechnology; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka biotehnologije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka biotehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-05-18 13:33:23