Optimization of Process Parameters for the Production of γ-Linolenic Acid by Cunninghamella elegans CFR C07 in Submerged Fermentation

U radu je ispitana proizvodnja γ-linolenske kiseline submerznom fermentacijom s pomoću gljivice Cunninghamella elegans CFR C07, te je proces optimiran odabirom najprikladnijeg izvora ugljika i optimalnog vremena inkubacije. Radi poboljšanja ekstrakcije lipida iz biomase nakon fermentacije ispitane su četiri različite metode: ekstrakcija pomoću otapala i pijeska tretiranog kiselinom, ekstrakcija pomoću otapala i staklenih kuglica, liofilizacija ili ekstrakcija u Soxhlet uređaju. Proizvodnja je γ-linolenske kiseline prvo optimirana u tikvici zapremnine 250 mL na tresilici, a zatim u fermentoru od 3 L. Postignut je prinos γ-linolenske kiseline od 882 mg/L na tresilici, te 733 mg/L u fermentoru. Rezultati istraživanja potvrđuju da je C. elegans CFR C07 odličan mikroorganizam za proizvodnju γ-linolenske kiseline u submerznim uvjetima.The production of γ-linolenic acid (GLA) by the fungus Cunninghamella elegans CFR C07 in submerged fermentation was studied. Culture parameters such as carbon source and incubation time were optimized. Four different extraction methods using solvents with acid washed sand, glass beads, lyophilization and Soxhlet extraction were evaluated for improved extraction of lipids from the fungal biomass after fermentation. The GLA production was initially optimized in 250-mL flask and the process was demonstrated in a 3-litre fermentor. The maximum GLA production was 882 mg/L in shake flask culture and 733 mg/L in the fermentor. The study shows that Cunninghamella elegans CFR C07 is a potent organism for the production of GLA under submerged conditions

Optimization of Process Parameters for the Production of γ-Linolenic Acid by Cunninghamella elegans CFR C07 in Submerged Fermentation

The production of γ-linolenic acid (GLA) by the fungus Cunninghamella elegans CFR C07 in submerged fermentation was studied. Culture parameters such as carbon source and incubation time were optimized. Four different extraction methods using solvents with acid washed sand, glass beads, lyophilization and Soxhlet extraction were evaluated for improved extraction of lipids from the fungal biomass after fermentation. The GLA production was initially optimized in 250-mL flask and the process was demonstrated in a 3-litre fermentor. The maximum GLA production was 882 mg/L in shake flask culture and 733 mg/L in the fermentor. The study shows that Cunninghamella elegans CFR C07 is a potent organism for the production of GLA under submerged conditions

Isobutanol production by Candida glabrata – A potential organism for future fuel demands

Due to global concern on the sustainability of energy from fossil fuels, isobutanol as a biofuel has urged attention in recent years due to its high octane number, higher blending capacity, low vapour pressure and higher energy content. The present study reports a novel wild strain, Candida glabrata, which produces isobutanol under submerged fermentation condition. Different process parameters have been optimized by both conventional as well as statistical methods. The production of isobutanol is enhanced in the presence of valine and this attribute the degradation pathway of valine is highly depend on isobutanol production. Under optimized condition, the yield of isobutanol is increased from 0.19 g/L to 0.96 g/L. This strain has not yet reported for the production of isobutanol

Spray drying as effective encapsulation method for phenol degrading bacteria

485-492Encapsulated microorganisms are potential candidates for treatment of recalcitrant and persistent toxic compounds in wastewater and agriculture. Though extensive investigations have been done on bacteria with ability to degrade toxic phenolics, there is no product available for efficient removal of phenolic compounds from waste effluents. The present study aims at preparation of encapsulated microorganisms for the treatment of waste water containing phenol. Acinetobacter seifertii and Bacillus pumilus were the organisms used for effective degradation of phenol. Various encapsulation methods have been tried. Among the different carrier materials used, corn starch was found to be the best material with long shelf life. Spray drying and freeze drying were the two methods adopted for encapsulation. Based on cell viability, spray drying was found to be an effective method compared to freeze drying. A. seifertii could degrade phenol completely with in 12 h while B. pumilus degraded phenol completely within 24 h

Spray drying as effective encapsulation method for phenol degrading bacteria

485-492Encapsulated microorganisms are potential candidates for treatment of recalcitrant and persistent toxic compounds in wastewater and agriculture. Though extensive investigations have been done on bacteria with ability to degrade toxic phenolics, there is no product available for efficient removal of phenolic compounds from waste effluents. The present study aims at preparation of encapsulated microorganisms for the treatment of waste water containing phenol. Acinetobacter seifertii and Bacillus pumilus were the organisms used for effective degradation of phenol. Various encapsulation methods have been tried. Among the different carrier materials used, corn starch was found to be the best material with long shelf life. Spray drying and freeze drying were the two methods adopted for encapsulation. Based on cell viability, spray drying was found to be an effective method compared to freeze drying. A. seifertii could degrade phenol completely with in 12 h while B. pumilus degraded phenol completely within 24 h