Efficiency of enzymatic and non-enzymatic catalysts in the synthesis of insoluble polyphenol and conductive polyaniline in water

Curvetto, N.; Figlas, D.; Brandolin, Adriana; Saidman, S.B.; Rueda, Elsa H.; Ferreira, Marı́a Luján

doi:10.1016/j.bej.2005.11.016

Cited by 20 publications

(21 citation statements)

References 23 publications

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“…92 Apesar de serem muito utilizadas industrialmente, peroxidases de raiz forte possuem enzimas análogas de outras fontes, como a peroxidase obtida de um fungo da podridão branca (Phanerochaete chyrsosporium), que pode apresentar atividade semelhante à peroxidase de origem vegetal, porém com menor custo de produção. 93 As lacases, também conhecidas como oxidases de cobre azul, são responsáveis por catalisar a abstração de hidrogênio de compostos fenólicos. São produzidas, na maior parte, por fontes microbianas e vegetais.…”

Section: Polifenóis E Polimerização Via Radicais Livresunclassified

Applications of Enzymes in Synthesis and Modification of Polymers

Albuquerque¹,

Ribeiro²,

Rabelo³

et al. 2014

Química Nova

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Recebido em 07/06/2013; aceito em 10/12/2013; publicado na web em 21/03/2014 APPLICATIONS OF ENZYMES IN SYNTHESIS AND MODIFICATION OF POLYMERS. Enzymes are biological catalysts that offer great potential for use in the synthesis and modification of polymers, being more specific and greener than chemical catalysts. In this work, enzymes from the classes of hydrolases (lipase, cutinase and protease) and of oxidoreductases (horseradish peroxidase, manganese peroxidase and laccase) were identified as the main biocatalysts responsible for the synthesis of polymers. Biocatalysis can potentially be part of the life cycle of several polymers, including polyesters, polyurethanes, polycarbonates, polyamides, functionalized polysaccharides and polystyrene, allowing the synthesis of specialty macromolecules for fine applications and with higher added-value than commodity polymers.Keywords: enzyme polymerization; biocatalysis; lipase. INTRODUÇÃOProcessos de polimerização representam uma das principais transformações químicas industriais da atualidade, sendo, em sua maioria, conduzidos na presença de catalisadores químicos não renováveis e sob elevadas temperaturas, demandando, em alguns casos, a proteção e desproteção de grupos funcionais, de forma a evitar a ocorrência de reações indesejadas. 1 Há cerca de 20 anos, a catálise enzimática tem sido apontada como uma estratégia de grande potencial para a síntese de políme-ros, por ser ambientalmente amigável e em geral bastante seletiva, permitindo assim a obtenção de macromoléculas com propriedades diferenciadas e de maior valor agregado.2 As enzimas para a síntese e também modificação de polímeros estão nas classes das hidrolases (como lipases, proteases e esterases) e das oxidorredutases. 3A biocatálise pode ser empregada tanto para a síntese de polí-meros naturais como de polímeros sintéticos, e dentre suas maiores vantagens está a elevada seletividade (enantio-, quimio-, éstereo-e régio-seletividade), levando à obtenção de polímeros perfeitamente estruturados na maioria dos casos. Além disso, a catálise enzimática ocorre em geral de forma bastante eficiente sob condições mais brandas de temperatura e pressão, 4 demanda reduzida (ou nenhuma) quantidade de solventes orgânicos, 5 não proporciona a formação de produtos secundários e os produtos finais são de fácil separação e recuperação.6-8 Tais vantagens ficam claras especialmente quando são empregados biocatalisadores na forma imobilizada, a qual é uma técnica amplamente reportada pela literatura.9,10 A biocatálise foi reconhecida na década de 1990 como uma área nova na síntese de polímeros de precisão. 11Dessa forma, o objetivo desse artigo é apresentar um panorama das principais enzimas e condições de processo que podem ser utilizadas para a síntese e a modificação de polímeros de interesse industrial. O reconhecimento da importância do tema se traduz pela existência hoje de livros inteiramente dedicados à polimerização enzimática. 12-14 APLICAÇÕES DE ENZIMAS NA SÍNTESE DE POLÍMEROS PoliésteresOs poliésteres estão dentre ...

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Section: Polifenóis E Polimerização Via Radicais Livresunclassified

Applications of Enzymes in Synthesis and Modification of Polymers

Albuquerque¹,

Ribeiro²,

Rabelo³

et al. 2014

Química Nova

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“…Laccases are heavily used in industrial processes, are relatively economic and highly stable. [56] used several protein extracts from different types of white -rot fungi, that presumably contained at least lignin peroxidase, manganese peroxidase and phenoloxidase laccase, among other enzymes. Karamyshev showed that fungal laccase from Coriolus hirsutus could be used instead of HRP in the SPS -templated synthesis of PANI [53] .…”

Section: Synthesis Of Pani Using Laccase Enzymesmentioning

confidence: 99%

Enzymatic Synthesis of Polyaniline and Other Electrically Conductive Polymers

Cruz‐Silva

Roman

Romero‐García

2010

Biocatalysis in Polymer Chemistry

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Since their discovery [1] , intrinsically conducting polymer s ( ICP s) have changed our way of thinking about polymers. With properties such as light weight, organic functionality, and distinctive electronic behavior, new applications were soon devised for these materials. Polyaniline ( PANI ) is one of the most interesting ICPs because of its chemical stability, tunable conductivity, and interesting electrochromic behavior [2] . This polymer is usually synthesized by chemical oxidation of the monomer in strong acidic media. Besides PANI, polythiophenes and polypyrrole are other important ICPs that have also been synthesized by oxidative polymerization. These polymers have been extensively used in several applications in the fi elds of organic electronics [3] , sensors [4] , actuators [5] , separation technologies [6] , and energy storage [7] , among others, and new applications for them are found continuously.Enzymatic polymerizations have become an interesting alternative route for polymer synthesis [8] . They are generally carried out under milder conditions than similar synthetic routes. Enzymes are natural catalysts which are non -toxic, biodegradable, energy effi cient and obtained from renewable resources. In this chapter, we review the different strategies that have been used for the enzymatic synthesis of PANI. Xu et al .[9] reviewed published work regarding enzymatic polymerization of aniline derivatives from its beginning until 2004. However, more recently, several groups have developed either new approaches for the enzymatic synthesis of PANI or different methods inspired by it. Indeed, the infl uence of the enzymatic synthesis of PANI can be seen in the development of several biocatalytic and biomimetic synthetic routes not only for the synthesis of PANI, but also for other important conductive polymers, such as polypyrrole ( PPy ) and poly(3,4 -ethylendioxythiophene) ( PEDOT ).

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“…Hemoglobin was encapsulated in a silica-based matrix for catalyzing the removal of aniline from aqueous solution [15]. Horseradish peroxidase has been intensively studied for the enzymatic catalysis of the oxidative polymerization of aniline [16][17][18]. Polymerization of aniline catalyzed by enzymes can be carried out under milder conditions, and the formed polyaniline can be removed from the wastewater through precipitation.…”

Section: Introductionmentioning

confidence: 99%

Specifically Grafting Hematin on MPTS-Coated Carbon Nanotubes for Catalyzing the Oxidation of Aniline

Zheng

et al. 2016

Catalysts

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Abstract:Catalysts supported on nanomaterials have been widely investigated for the treatment of hazardous materials. This work has developed a novel method for grafting hematin on nanomaterials for catalyzing the oxidation of aniline in order to remove aniline from wastewater. Magnetic multi-walled carbon nanotubes (M-MWCNTs) were coated with a layer formed through the hydrolysis and condensation of 3-mercaptopropyltriethoxysilane (MPTS). Hematin was specifically grafted on the MPTS-coated M-MWCNTs through thiol-alkene reaction. Hematin-MPTS-M-MWCNTs were used to catalyze the oxidation of aniline, and a high efficiency has been obtained. Consecutive use of the conjugate of hematin-MPTS-M-MWCNTs has been investigated, and the activity has been retained to a significant extent after five reaction/cleaning cycles. The result demonstrates that hematin-MPTS-M-MWCNTs are efficient for catalyzing the oxidation of aniline. The methodology for the specific grafting of hematin is of general utility, it is an easy-to-operate method and can be extended to other supports. Potentially, hematin-MPTS-based conjugates have a widespread application in catalyzing the removal of aniline from wastewater.

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Efficiency of enzymatic and non-enzymatic catalysts in the synthesis of insoluble polyphenol and conductive polyaniline in water

Cited by 20 publications

References 23 publications

Applications of Enzymes in Synthesis and Modification of Polymers

Applications of Enzymes in Synthesis and Modification of Polymers

Enzymatic Synthesis of Polyaniline and Other Electrically Conductive Polymers

Specifically Grafting Hematin on MPTS-Coated Carbon Nanotubes for Catalyzing the Oxidation of Aniline

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