Nota Científica: Quitosana como fungicida em madeiras Pinus sp. empregadas na confecção de caixas “K”

Sattolo, Natalia Meinl Schmiedt; Britto, Douglas de; Assis, O. B. G.

doi:10.4260/bjft2010130200017

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…Research shows that chitosan has been shown to minimize the attack of fungi, however, few studies have been carried out on the application of chitosan to wood [21,[39][40][41][42][43]. According to the authors, chitosan is a low-cost, naturally occurring, nontoxic, edible and biodegradable polysaccharide, which has been found in a wide variety of natural sources (crustaceans, fungi, insects, annelids, mollusks, coelenterates, etc.).…”

Section: Tablementioning

confidence: 99%

“…It is usually a by-product of the crustacean processing industries (shrimp, krill, crab and lobster). According to [43], the fungicidal effect of chitosan is well documented in the literature, the most accepted model being the one related to the polycationic nature of the polysaccharide that interacts with anionic sites of the cell walls of the fungi. Such interaction is mediated by electrostatic forces, causing changes in the permeability of cell membranes and osmotic instability.…”

Section: Tablementioning

confidence: 99%

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Preservative Treatments on Wood and Their Effects on Metal Fasteners

Dias¹,

Barreiros²

2022

Engineered Wood Products for Construction

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Wood as a building material has characteristics that make it attractive environmentally compared to other materials. It is an economic, historical and sustainable material. Many species of wood are naturally resistant to the action of the organisms that degrade them. However, species with this natural resistance are unable to meet the demand for wood and wood-based products, which have been growing year by year. The scarcity of species resistant to biological degradation forced man to use other less durable species, mainly of rapid growth, from reforestation, such as some species of Eucalyptus and Pinus. These species have moderate or no resistance to attack by biological agents and require preservative treatments. And to increase the life span of these fast-growing woods, protecting them from fungi, insects and other xylophagous organisms, several preservative agents are used, these compounds being highly toxic to these biodeteriorating organisms. It is known that the effectiveness of traditional wood preservation systems is due to the biocidal effect of the products used, however, they pollute the environment. Thus, there is an increasing need to develop effective preservative chemicals, non-toxic to humans and the environment.

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Section: Tablementioning

confidence: 99%

Section: Tablementioning

confidence: 99%

Preservative Treatments on Wood and Their Effects on Metal Fasteners

Dias¹,

Barreiros²

2022

Engineered Wood Products for Construction

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Produtos Naturais como Preservantes para Madeiras de Rápido Crescimento – Uma Revisão

Bossardi¹,

Barreiros²

2011

RCMD

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Avaliação in Vitro Da Ação Da Quitosana E De Seu Derivado Quaternizado Na Inibição Do Crescimento Do Fungo Penicillium Expansum

Mendes¹,

Bresolin

Assis

et al. 2016

Revista Brasileira De Engenharia De Biossistemas

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RESUMOQuitosana comercial de média massa molar (400.000 gmol -1 ) e seu derivado quaternizado hidrossolúvel N,N,N-trimetilquitosana foram avaliados em condições laboratoriais, em análises in vitro, como agentes inibidores do crescimento de Penicillium expansum. Formulações nas concentrações de 0,1; 1,0; 5,0 e 10,0 gL -1 de cada polímero foram preparadas e adicionados em meio de cultura BDA sólido e aquoso. O fungo foi isolado de frutas contaminadas, cultivado e inoculado nos meios contendo os polímeros. Análises conduzidas por medida do crescimento de colônias em meio sólido e por contagem de esporos germinados em meio liquido (em câmara de Neubauer) indicaram eficiência na redução da infestação por ambos os polímeros, porém em condições distintas. A quitosana apresentou elevada eficiência em meio líquido enquanto seu derivado foi eficaz na redução do crescimento em meio de cultura sólido, ambos em baixas concentrações (0,1 e 1,0 gL -1 ). Os resultados são discutidos com base nos mecanismos aceitos de ação antimicrobiana da quitosana, objetivando potenciais aplicações tópicas em frutos na condição pós-colheita.Palavras-chave: quitosana, antifúngico natural, bolor azul, biopolímeros, P. expansum IN VITRO EVALUATION OF CHITOSAN AND ITS QUATERNIZED DERIVATIVE ON THE INHIBITION OF PENICILLIUM EXPANSUM GROWTH ABSTRACTChitosan of medium molar weight (400,000 gmol -1 ) from commercial origin and its quaternized water-soluble derivative N,N,N-trimethylchitosan were evaluated in laboratorial scale, in in vitro analyses, as inhibitors agents of Penicillium expansum growth. Formulations with polymer concentrations of 0.1; 1.0; 5.0 and 10.0 gL -1 were prepared and added to PDA solid and aqueous culture medium. The fungus strain was collected from decay fruits, harvested and inoculated in the medium with the polymers. Measurement of colony size growth (in solid medium) and germinated spore's counting (in liquid medium using a Neubauer cell) indicated that both polymers act efficiently in reducing fungal infestation, nevertheless in distinct ways. The chitosan showed high efficiency in liquid medium while the derivative was more effective in solid medium, * odilio.assis@embrapa.br

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Nota Científica: Quitosana como fungicida em madeiras Pinus sp. empregadas na confecção de caixas “K”

Cited by 4 publications

References 3 publications

Preservative Treatments on Wood and Their Effects on Metal Fasteners

Preservative Treatments on Wood and Their Effects on Metal Fasteners

Produtos Naturais como Preservantes para Madeiras de Rápido Crescimento – Uma Revisão

Avaliação in Vitro Da Ação Da Quitosana E De Seu Derivado Quaternizado Na Inibição Do Crescimento Do Fungo Penicillium Expansum

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