Fourier transform infrared spectroscopy as a method to study lipid accumulation in oleaginous yeasts

Biotechnology for Biofuels

Diletta Ami³  Riccardo Posteri¹  Paolo Mereghetti²  Danilo Porro¹  Silvia Maria Doglia³  Paola Branduardi¹ 

[1] Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, Milano 20126, Italy

[2] Center for Nanotechnology Innovation @NEST, Italian Institute of Technology, Piazza San Silvestro 12, Pisa 56127, Italy

[3] Consorzio Nazionale Interuniversitario per le Scienze fisiche della Materia (CNISM) UdR Milano-Bicocca, Milano 20126, Italy

关键词: Biodiesel;    Fatty acids (FA);    Oleaginous yeasts;    Saccharomyces cerevisiae;    Rhodosporidium toruloides;    Cryptococcus curvatus;    Principal component analysis (PCA);    Fourier transform infrared spectroscopy (FTIR);   

Others  :  793893
DOI  :  10.1186/1754-6834-7-12

 received in 2013-09-11, accepted in 2014-01-10,  发布年份 2014

【 摘 要 】

Background

Oleaginous microorganisms, such as different yeast and algal species, can represent a sustainable alternative to plant oil for the production of biodiesel. They can accumulate fatty acids (FA) up to 70% of their dry weight with a predominance of (mono)unsaturated species, similarly to what plants do, but differently from animals. In addition, their growth is not in competition either with food, feed crops, or with agricultural land.

Despite these advantages, the exploitation of the single cell oil system is still at an early developmental stage. Cultivation mode and conditions, as well as lipid extraction technologies, represent the main limitations. The monitoring of lipid accumulation in oleaginous microorganisms is consequently crucial to develop and validate new approaches, but at present the majority of the available techniques is time consuming, invasive and, when relying on lipid extraction, can be affected by FA degradation.

Results

In this work the fatty acid accumulation of the oleaginous yeasts Cryptococcus curvatus and Rhodosporidium toruloides and of the non-oleaginous yeast Saccharomyces cerevisiae (as a negative control) was monitored in situ by Fourier Transform Infrared Spectroscopy (FTIR). Indeed, this spectroscopic tool can provide complementary information to those obtained by classical techniques, such as microscopy, flow cytometry and gas chromatography. As shown in this work, through the analysis of the absorption spectra of intact oleaginous microorganisms it is possible not only to monitor the progression of FA accumulation but also to identify the most represented classes of the produced lipids.

Conclusions

Here we propose FTIR microspectroscopy - supported by multivariate analysis - as a fast, reliable and non invasive method to monitor and analyze FA accumulation in intact oleaginous yeasts. The results obtained by the FTIR approach were in agreement with those obtained by the other classical methods like flow cytometry and gas chromatography. Moreover, the possibility to track lipid production in real time is highly desirable to support the initial screening of strains and media as well as to optimize the scaling up experiments, which are essential for a viable and successful development of an industrial production process.

【 授权许可】

   
2014 Ami et al.; licensee BioMed Central Ltd.

【 图 表 】

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