Harnessing the Effect of pH on Lipid Production in Batch Cultures of Yarrowia lipolytica SKY7

2017 ◽  
Vol 184 (4) ◽  
pp. 1332-1346 ◽  
Author(s):  
Mathiazhakan Kuttiraja ◽  
Ayed Dhouha ◽  
Rajeshwar Dayal Tyagi
Keyword(s):  
Yarrowia Lipolytica ◽  
Lipid Production ◽  
Effect Of Ph ◽  
Batch Cultures

scholarly journals Lipids by Yarrowia lipolytica Strains Cultivated on Glucose in Batch Cultures

2020 ◽  
Vol 8 (7) ◽  
pp. 1054 ◽  
Author(s):  
Erdem Carsanba ◽  
Seraphim Papanikolaou ◽  
Patrick Fickers ◽  
Huseyin Erten
Keyword(s):  
Fatty Acids ◽  
Yarrowia Lipolytica ◽  
Lipid Production ◽  
Culture Conditions ◽  
Microbial Lipid ◽  
Culture Collections ◽  
Batch Cultures ◽  
Food Biotechnology ◽  
High Lipid ◽  
Dry Cell Weight

Oleaginous microorganisms, such as Yarrowia lipolytica, accumulate lipids that can have interesting applications in food biotechnology or the synthesis of biodiesel. Y. lipolytica yeast can have many advantages such as wide substrate range usage and robustness to extreme conditions, while under several culture conditions it can produce high lipid productivity. Based on this assumption, in this study, 12 different Yarrowia lipolytica strains were used to investigate microbial lipid production using a glucose-based medium under nitrogen-limited conditions in shake-flask cultivations. Twelve wild-type or mutant strains of Yarrowia lipolytica which were newly isolated or belonged to official culture collections were tested, and moderate lipid quantities (up to 1.30 g/L) were produced; in many instances, nitrogen limitation led to citric acid production in the medium. Lipids were mainly composed of C16 and C18 fatty acids. Most of the fatty acids of the microbial lipid were unsaturated and corresponded mainly to oleic, palmitic and linoleic acids. Linolenic acid (C18:3) was produced in significant quantities (between 10% and 20%, wt/wt of dry cell weight (DCW)) by strains H917 and Po1dL.

scholarly journals Aeration and Stirring in Yarrowia lipolytica Lipase Biosynthesis during Batch Cultures with Waste Fish Oil as a Carbon Source

Fermentation ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 88
Author(s):  
Paulina Snopek ◽  
Dorota Nowak ◽  
Bartłomiej Zieniuk ◽  
Agata Fabiszewska
Keyword(s):  
Carbon Source ◽  
Fish Oil ◽  
Yarrowia Lipolytica ◽  
Lipolytic Activity ◽  
Culture Conditions ◽  
Agitation Speed ◽  
Oxygen Deficit ◽  
Shear Stresses ◽  
Process Selection ◽  
Batch Cultures

Yarrowia lipolytica is one of the most studied non-conventional forms of yeast, exhibiting a high secretory capacity and producing many industrially important and valuable metabolites. The yeast conceals a great biotechnological potential to synthesize organic acids, sweeteners, microbial oil, or fragrances. The vast majority of bioprocesses are carried out in bioreactors, where suitable culture conditions are provided. In the current study, the effect of agitation speed (200–600 rpm) and air flow rate (0.0375–2.0 dm3/(dm3 × min)) on the biomass yield and lipase activity of Y. lipolytica KKP 379 is analyzed in a growth medium containing waste fish oil. The increase of aeration intensity limited the period of oxygen deficit in the medium. Simultaneously, an increase in lipolytic activity was observed from 2.09 U/cm3 to 14.21 U/cm3; however, an excessive agitation speed likely caused oxidative or shear stresses, and a reduction in lipolytic activity was observed. Moreover, it is confirmed that the synthesis of lipases is related to oxygen consumption, pH, and the yeast growth phase, and appropriate process selection may provide two advantages, namely, the maximum use of the waste carbon source and the production of lipolytic enzymes that are valuable in many industries.

scholarly journals High‐yield lipid production from lignocellulosic biomass using engineered xylose‐utilizing Yarrowia lipolytica

GCB Bioenergy ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 670-679 ◽  
Author(s):  
Sang Do Yook ◽  
Jiwon Kim ◽  
Gyeongtack Gong ◽  
Ja Kyong Ko ◽  
Youngsoon Um ◽  
...  
Keyword(s):  
Lignocellulosic Biomass ◽  
Yarrowia Lipolytica ◽  
Lipid Production ◽  
High Yield

Increased Lipid Production in Yarrowia lipolytica from Acetate through Metabolic Engineering and Cosubstrate Fermentation

2021 ◽  
Author(s):  
Lin Chen ◽  
Wei Yan ◽  
Xiujuan Qian ◽  
Minjiao Chen ◽  
Xiaoyu Zhang ◽  
...  
Keyword(s):  
Metabolic Engineering ◽  
Yarrowia Lipolytica ◽  
Lipid Production

scholarly journals pH selectively regulates citric acid and lipid production in Yarrowia lipolytica W29 during nitrogen-limited growth on glucose

2019 ◽  
Vol 290 ◽  
pp. 10-15 ◽  
Author(s):  
Shuyan Zhang ◽  
Sujit Sadashiv Jagtap ◽  
Anshu Deewan ◽  
Christopher V. Rao
Keyword(s):  
Citric Acid ◽  
Yarrowia Lipolytica ◽  
Lipid Production ◽  
Limited Growth

scholarly journals Enhanced lipid production by Yarrowia lipolytica cultured with synthetic and waste-derived high-content volatile fatty acids under alkaline conditions

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Ruiling Gao ◽  
Zifu Li ◽  
Xiaoqin Zhou ◽  
Wenjun Bao ◽  
Shikun Cheng ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Acetic Acid ◽  
Propionic Acid ◽  
Yarrowia Lipolytica ◽  
Butyric Acid ◽  
Lipid Content ◽  
Volatile Fatty Acids ◽  
Lipid Production ◽  
Initial Ph ◽  
Alkaline Conditions

Abstract Background Volatile fatty acids (VFAs) can be effective and promising alternate carbon sources for microbial lipid production by a few oleaginous yeasts. However, the severe inhibitory effect of high-content (> 10 g/L) VFAs on these yeasts has impeded the production of high lipid yields and their large-scale application. Slightly acidic conditions have been commonly adopted because they have been considered favorable to oleaginous yeast cultivation. However, the acidic pH environment further aggravates this inhibition because VFAs appear largely in an undissociated form under this condition. Alkaline conditions likely alleviate the severe inhibition of high-content VFAs by significantly increasing the dissociation degree of VFAs. This hypothesis should be verified through a systematic research. Results The combined effects of high acetic acid concentrations and alkaline conditions on VFA utilization, cell growth, and lipid accumulation of Yarrowia lipolytica were systematically investigated through batch cultures of Y. lipolytica by using high concentrations (30–110 g/L) of acetic acid as a carbon source at an initial pH ranging from 6 to 10. An initial pH of 8 was determined as optimal. The highest biomass and lipid production (37.14 and 10.11 g/L) were obtained with 70 g/L acetic acid, whereas cultures with > 70 g/L acetic acid had decreased biomass and lipid yield due to excessive anion accumulation. Feasibilities on high-content propionic acid, butyric acid, and mixed VFAs were compared and evaluated. Results indicated that YX/S and YL/S of cultures on butyric acid (0.570, 0.144) were comparable with those on acetic acid (0.578, 0.160) under alkaline conditions. The performance on propionic acid was much inferior to that on other acids. Mixed VFAs were more beneficial to fast adaptation and lipid production than single types of VFA. Furthermore, cultures on food waste (FW) and fruit and vegetable waste (FVW) fermentate were carried out and lipid production was effectively improved under this alkaline condition. The highest biomass and lipid production on FW fermentate reached 14.65 g/L (YX/S: 0.414) and 3.20 g/L (YL/S: 0.091) with a lipid content of 21.86%, respectively. By comparison, the highest biomass and lipid production on FVW fermentate were 11.84 g/L (YX/S: 0.534) and 3.08 g/L (YL/S: 0.139), respectively, with a lipid content of 26.02%. Conclusions This study assumed and verified that alkaline conditions (optimal pH 8) could effectively alleviate the lethal effect of high-content VFA on Y. lipolytica and significantly improve biomass and lipid production. These results could provide a new cultivation strategy to achieve simple utilizations of high-content VFAs and increase lipid production. Feasibilities on FW and FVW-derived VFAs were evaluated, and meaningful information was provided for practical applications.

scholarly journals High-throughput fermentation screening for the yeast Yarrowia lipolytica with real-time monitoring of biomass and lipid production

2016 ◽  
Vol 15 (1) ◽  
Author(s):  
Alexandre Back ◽  
Tristan Rossignol ◽  
François Krier ◽  
Jean-Marc Nicaud ◽  
Pascal Dhulster
Keyword(s):  
Real Time ◽  
Yarrowia Lipolytica ◽  
High Throughput ◽  
Lipid Production ◽  
Real Time Monitoring ◽  
Yeast Yarrowia Lipolytica
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