Application of Pyrolysis-Gas Chromatography-Mass Spectrometry and Multivariate Analysis to Study Bacteria and Fungi in Biofilms Used for Bioremediation

Author(s): Dora Melucci, Stefano Fedi, Marcello Locatelli, Clinio Locatelli, Simona Montalbani, Martina Cappelletti.

Journal Name: Current Drug Targets

Volume 14 , Issue 9 , 2013

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Abstract:

Biofilms are communities of microorganisms adhering to a surface and embedded in an extracellular polymeric matrix, frequently associated with disease and contamination, and also used for engineering applications such as bioremediation. A mixed biofilm formed by bacteria and fungi may provide an optimal habitat for addressing contaminated areas. To exploit the potential of natural microbial communities consisting of bacteria and fungi, it is essential to understand and control their formation. In this work, a method to discriminate among bacteria of genera Bacillus, Pseudomonas, Rhodococcus with respect to the fungus Pleorotus in a biofilm by means of pyrolysis-gaschromatography-mass spectrometry and multivariate analysis is reported. Methylated fatty acids were chosen as biomarkers of microorganisms in the pyrolysates. In situ thermal hydrolysis and methylation was applied. Pyrograms were used as fingerprints, thus allowing for the characterization of whole cells analyzed without any sample pretreatment. Normalized pyrographic peak areas were chosen as variables for chemometric data processing. Principal components analysis was applied as a dataexploration tool. Satisfactory results were obtained in analyzing a real biofilm. The influence of growth medium on whole bacteria fatty acid cell composition was also explored.

Keywords: Analytical pyrolysis, GC-MS, chemometrics, PCA, direct analysis of whole cells.

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Article Details

VOLUME: 14
ISSUE: 9
Year: 2013
Page: [1023 - 1033]
Pages: 11
DOI: 10.2174/1389450111314090011
Price: $58

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