Gamma-linolenic acid production by Cunninghamella echinulata growing on complex organic nitrogen sources.
Growth of two strains of Cunninghamella echinulata on various nitrogen containing raw materials (corn gluten, corn steep, whey concentrate,yeast extract and tomato waste hydrolysate) yielded important amounts of biomass containing various quantities of gamma-linolenic acid (GLA) rich cellular lipids. Especially, growth on tomato waste hydrolysate (TWH) yielded 17.6 g/l of biomass containing 39.6% oil and significant quantities of GLA corresponding to 800 mg/l GLA. Mycelium-bounded proteolytic activity was detected during early growth stages on TWH and declined thereafter, increasing the concentration of assimilable nitrogen in the medium. However, addition of glucose in the medium during the stationary phase triggered the biosynthesis of reserve lipid, since an increase of the proportion of neutral lipids from 45% to 79% in total lipids was observed, while polar lipids decreased from 35% to 12% and from 20% to 9% for glycolipids plus sphingolipids and phospholipids, respectively.
Fakas
Stylianos
S
Laboratory of Food Microbiology and Biotechnology, Department of Food Science and Technology, Agricultural University of Athens, 75 Iera Odos, 11855 Athens, Greece.
Certik
Milan
M
Papanikolaou
Seraphim
S
Aggelis
George
G
Komaitis
Michael
M
Galiotou-Panayotou
Maria
M
D019149:Bioreactors; D003470:Culture Media; D020093:Cunninghamella / Q000235:genetics* / Q000254:growth & development; D005285:Fermentation; D005656:Fungal Proteins / Q000378:metabolism; D018551:Solanum lycopersicum; D009584:Nitrogen / Q000378:metabolism; D009930:Organic Chemicals / Q000378:metabolism; D010447:Peptide Hydrolases / Q000378:metabolism; D017965:gamma-Linolenic Acid / Q000096:biosynthesis*
D003470:Culture Media; D005656:Fungal Proteins; D009930:Organic Chemicals; D017965:gamma-Linolenic Acid; D010447:Peptide Hydrolases; D009584:Nitrogen