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BMC Biotechnology

, 11:94

First Online: 13 October 2011Received: 29 April 2011Accepted: 13 October 2011

Abstract

BackgroundTo expand on the range of products which can be obtained from lignocellulosic biomass, the lignin component should be utilized as feedstock for value-added chemicals such as substituted aromatics, instead of being incinerated for heat and energy. Enzymes could provide an effective means for lignin depolymerization into products of interest. In this study, soil bacteria were isolated by enrichment on Kraft lignin and evaluated for their ligninolytic potential as a source of novel enzymes for waste lignin valorization.

ResultsBased on 16S rRNA gene sequencing and phenotypic characterization, the organisms were identified as Pandoraea norimbergensis LD001, Pseudomonas sp LD002 and Bacillus sp LD003. The ligninolytic capability of each of these isolates was assessed by growth on high-molecular weight and low-molecular weight lignin fractions, utilization of lignin-associated aromatic monomers and degradation of ligninolytic indicator dyes. Pandoraea norimbergensis LD001 and Pseudomonas sp. LD002 exhibited best growth on lignin fractions, but limited dye-decolourizing capacity. Bacillus sp. LD003, however, showed least efficient growth on lignin fractions but extensive dye-decolourizing capacity, with a particular preference for the recalcitrant phenothiazine dye class Azure B, Methylene Blue and Toluidene Blue O.

ConclusionsBacillus sp. LD003 was selected as a promising source of novel types of ligninolytic enzymes. Our observations suggested that lignin mineralization and depolymerization are separate events which place additional challenges on the screening of ligninolytic microorganisms for specific ligninolytic enzymes.

Electronic supplementary materialThe online version of this article doi:10.1186-1472-6750-11-94 contains supplementary material, which is available to authorized users.

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Autor: Luaine Bandounas - Nick JP Wierckx - Johannes H de Winde - Harald J Ruijssenaars

Fuente: https://link.springer.com/article/10.1186/1472-6750-11-94



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