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Master's Dissertation
DOI
https://doi.org/10.11606/D.87.2021.tde-01112023-103040
Document
Author
Full name
Esther Cecília Nunes da Silva
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2021
Supervisor
Committee
Perpetuo, Elen Aquino (President)
Contiero, Jonas
Gomez, José Gregorio Cabrera
Jimenez, Paula Christine
Title in Portuguese
Produção de copolímeros do tipo P(3HB-co-3HV) por Methylopila oligotropha (cepa MCSUBH) isolada do manguezal de Cubatão-SP
Keywords in Portuguese
Ácido Valérico
Copolímeros
Metilotrófica, Metanol
Poli(3-hidroxibutirato-co-3-hidroxivalerato)
Abstract in Portuguese
Neste trabalho, a cepa MCSUBH, metilotrófica, aeróbia facultativa, isolada e identificada como Methylopila oligotropha, foi caracterizada como uma nova bactéria capaz de produzir polihidroxialcanoatos (PHA). Esta cepa foi isolada de área de manguezal em Cubatão-SP e cultivada em experimentos em frascos agitados, a fim de verificar sua capacidade de produção de poli(3-hidroxibutirato-co-3-hidroxivalerato) (P(3HB-co-3HV)) a partir de metanol e outros co-substratos (ácido cítrico; propanol; ácido propiônico e ácido valérico). Em diferentes fontes de carbono (ácido cítrico; propanol e ácido propiônico), a cepa acumulou valores de poli (3-hidroxibutirato) (PHB) entre 1,31 e 1,53g.L-1. No entanto, somente foi capaz de acumular o P(3HB-co-3HV) apenas quando o ácido valérico foi fornecido como co-substrato na presença de metanol. Além disso, foram testadas diferentes estratégias para a produção do copolímerocomo: tempo de cultivo, concentração de metanol e concentração de nitrogênio. A produção de P(3HB-co-3HV) variou entre 0,49 e 2,41g.L-1 com diferentes frações molares de ácido 3-hidroxivalérico (3HV) (entre 1,86-20 mol%).
Title in English
Production of P(3HB-co-3HV) type copolymers by Methylopila oligotropha (MCSUBH strain) isolated from the mangroves of Cubatão-SP
Keywords in English
Copolymers
Methylotrophic, Methanol
Poly (3-hydroxybutyrate-co-3-hydroxyvalerate)
Valeric Acid
Abstract in English
In this work, the strain MCSUBH, methylotrophic, aerobic, facultative, isolated and identified as Methylopila oligotropha, was characterized as a new bacterium capable of producing polyhydroxyalkanoate (PHA). This strain was isolated from a mangrove area in Cubatão-SP and cultivated in experiments in agitated flasks, in order to verify its production capacity of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (P(3HB-co-3HV)) from methanol and other co- substrates (citric acid; propanol; propionic acid and valeric acid). In different sources of carbon (citric acid; propanol and propionic acid), the strain accumulated values of poly(3- hydroxybutyrate) (PHB) between 1.31 and 1.53g.L-1. However,it was only able to accumulate P(3HB-co-3HV) when valeric acid was supplied as a co-substrate with methanol. Moreover, different strategies for the production of the copolymer were tested, such as: cultivation time, methanol concentration and nitrogen concentration. The production of P(3HB-co-3HV), varied between 0.49 and 2.41g.L-1, containing different molar fractions of 3-hydroxyvaleric acid (3HV) (1.86 to 20 mol%).
 
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Release Date
2026-01-14
Publishing Date
2024-01-29
 
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