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Master's Dissertation
DOI
https://doi.org/10.11606/D.87.2016.tde-07032016-112408
Document
Author
Full name
Karina Regueira Hornink
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2015
Supervisor
Committee
Vicente, Elisabete Jose (President)
Araujo, Welington Luiz de
Sakata, Solange Kazumi
Title in Portuguese
Isolamento e identificação de bactérias com potencial para realizar biorremediação de cobre.
Keywords in Portuguese
Cupriavidus
Pseudomonas
Adsorção de metais
Biodiversidade bacteriana
Biorremediação de metais
Cobre
Maldi-TOF
Abstract in Portuguese
A aplicação de microrganismos capazes de adsorver metais se destaca dentre as técnicas para biorremediação ambiental. O objetivo deste trabalho foi isolar e identificar bactérias com potencial de emprego nesta tecnologia. A partir de amostras de solo, água e sedimentos coletadas da mina Sossego da VALE em 4 eventos de coleta, foram isoladas 73 bactérias resistentes à altas concentrações de Cu2+. Para a identificação dos isolados utilizaram-se diversos métodos: MALDI-TOF; sequenciamento de parte dos genes 16S rRNA e rpoD; construção de árvores filogenéticas; e provas bioquímicas. Foram selecionadas 12 bactérias pertencentes a pelo menos, 8 espécies diferentes, sendo a maioria pertencente ao gênero Cupriavidus. 75% dos isolados apresentou resistência a Cu2+ superior a de C. metallidurans CH34, bactéria mais resistente a Cu2+ conhecida. Valores de adsorção de Cu2+ superiores aos desta bactéria também foram observados em 5 isolados. Os resultados obtidos indicam que os isolados selecionados apresentam alto potencial para aplicação em biorremediação ambiental.
Title in English
Isolation and identification of bacteria with potencial to biorremediate copper.
Keywords in English
Cupriavidus
Pseudomonas
Bacterial biodiversity
Copper
Maldi-TOF
Metal adsorption
Metals bioremediation
Abstract in English
The application of microorganisms capable of adsorbing toxic metals stands out from other bioremediation techniques. This study aimed to isolate and identify bacteria with potential for bioremediation of environments contaminated by copper ions. From soil, water and sediment samples collected at VALE`s Sossego mine collected at 4 different occasions, 73 copper resistant bacteria were isolated. For the identification of the isolates, various methods were used: MALDI-TOF, sequencing of part from the genes rRNA and rpoD; construction of phylogenetic trees; and biochemical tests. 12 bacteria that belong to at least 8 different species were selected. 75% of the isolates were resistant to Cu2+ exceeding C. metallidurans CH34, the, most resistant bacteria to Cu2+ known. The ion adsorption capacity of 5 isolates was greater than those for C. metallidurans. The results obtained for the bacterial isolates indicate that they have a high potential for application in environmental bioremediation.
 
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Publishing Date
2016-03-09
 
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