A quitosana como fungistático no crescimento micelial de Rhizoctonia solani Kuhn

Freddo, Álvaro Rodrigo; Mazaro, Sérgio Miguel; Brun, Eleandro José; Júnior, Américo Wagner

doi:10.1590/s0103-84782014000100001

Cited by 11 publications

(6 citation statements)

References 10 publications

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“…In our present study, chitosan was effective in inhibition R. solani mycelial growth. These observations confirmed similar data on the antifungal effect of chitosan on mycelial growth of R. solani [27,28], and other several phytopathogenic fungi, such as Fusarium solani [29], Colletotrichum sp [30]. This recent study also showed that chitosan can effectively manage black scurf in potato tubers, by induction of defense-related enzymes such as POD, PPO.…”

Section: Discussionsupporting

confidence: 84%

Inhibition of Mycelial Growth of Rhizoctonia Solani by Chitosan in vitro and in vivo

Mohammed¹,

Zeitar²,

Eskov³

2019

TOASJ

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Objective: Evaluate the antifungal effect of chitosan against Rhizoctonia solani in vitro and the possible mechanisms of its induced activity in potato tubers to control black scurf disease. Methods: The in vitro influence of chitosan at different concentrations on mycelial growth of R. solani was tested by using the poisoned food technique in PDA medium. The effect of these concentrations on the development of lesion diameters in tubers inoculated with R. solani mycelium was assayed for 30 days. The concentration that showed the greatest inhibitory effect on lesion diameters was tested to assess the induced activity of defense-related enzymes in the infected tubers. Results: In the poisoned food technique, chitosan at 1% completely inhibited the growth of R. solani mycelium. In vivo tests showed that chitosan treatment at 0.5% effectively controlled the black scurf in tubers inoculated with R. solani mycelium. Chitosan increased the activities of defense-related enzymes such as Peroxidase (POD), Polyphenol Oxidase (PPO) and Phenylalanine Ammonia-lyase (PAL) in treated tubers of tested cultivars. Conclusion: This work demonstrated that chitosan directly inhibited the growth of R. solani, and potentially elicited defense reaction in potato tubers.

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Section: Discussionsupporting

confidence: 84%

Inhibition of Mycelial Growth of Rhizoctonia Solani by Chitosan in vitro and in vivo

Mohammed¹,

Zeitar²,

Eskov³

2019

TOASJ

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“…Os polímeros quitina e quitosana têm sido bastante estudados devido ao elevado potencial de aplicações em indústrias alimentícias, farmacêuticas, cosméticas e na agricultura [1][2][3] . Esses polímeros são constituídos de cadeias lineares dos carboidratos 2-acetamido-2-deoxi-D-glicopiranose e 2-amino-2-deoxi-D-glicopiranose unidos por ligações glicosídicas β (1-4) e, podem ser distinguidos por suas solubilidades em solução aquosa de ácido acético 1%.…”

Section: Introductionunclassified

Preparo e caracterização de filmes comestíveis de quitosana

et al. 2015

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ResumoEste trabalho tem como objetivo a caracterização de três amostras comerciais de quitosana de baixo grau de acetilação, bem como a preparação e caracterização de filmes comestíveis a partir dessas amostras, com vistas a posterior aplicação desses filmes em recobrimento de frutos. As amostras foram caracterizadas pela massa molar, grau de acetilação, análise elementar, espectroscopia de infravermelho e análise térmica, enquanto os filmes pela análise térmica, espectroscopia de infravermelho, sólidos totais e permeabilidade ao vapor de água. As amostras comerciais mostraram diferentes massas molares que variaram de 132 a 245 kDa, graus de acetilação de 5,8 a 6,3% e apresentaram análise elementar próxima a fórmula C 6 H 11 O 4 N para a unidade de repetição. Os filmes produzidos apresentaram espessuras de 3,7 a 6,8 μm, sólidos totais de 2,0 a 6,3 g m -2 e permeabilidade ao vapor de água de 170,1 a 180,2 g dia -1 m -2 . Os filmes de quitosana com maior teor de sólidos e menor massa molar foram menos permeáveis ao vapor de água. Nas análises de infravermelho e termogravimetria foram observados, respectivamente, os mesmos grupos funcionais e curvas semelhantes de decomposição, para as amostras e para os filmes produzidos. Palavras-chave: caracterização, filmes comestíveis, quitosana. AbstractThe objective of this study is to characterize three commercial samples of chitosan with low degree of acetylation, as well as the preparation and characterization of edible films from these samples, aiming the subsequent application of these films in fruit coatings. The samples were characterized by molar mass, degree of acetylation, elemental analysis, infrared spectroscopy and thermal analysis, while the film was characterized by thermal analysis, infrared spectroscopy, total solids and water vapor permeability. The commercial samples showed different molar masses, which ranged from 132 to 245 kDa, degrees of acetylation from 5.8 to 6.3% and presented an elemental analysis next to the formula C 6 H 11 O 4 N, for the repeating unit. The films produced had thicknesses from 3.7 to 6.8 μm, total solids from 2.0 to 6.3 g m -2 and water vapor permeability from 170.1 to 180.2 g day -1 m -2. The chitosan films with a higher content of solids and a lower molar mass were less permeable to water vapor. Infrared and thermogravimetric analyses showed the same functional groups and similar decomposition curves, respectively, for the samples and for the films produced.Keywords: characterization, edible films, chitosan. IntroduçãoOs polímeros quitina e quitosana têm sido bastante estudados devido ao elevado potencial de aplicações em indústrias alimentícias, farmacêuticas, cosméticas e na agricultura [1][2][3] . Esses polímeros são constituídos de cadeias lineares dos carboidratos 2-acetamido-2-deoxi-D-glicopiranose e 2-amino-2-deoxi-D-glicopiranose unidos por ligações glicosídicas β (1-4) e, podem ser distinguidos por suas solubilidades em solução aquosa de ácido acético 1%. Quitina, contendo um número ≥ 40% de N-acetil-D-glicosamina é in...

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“…This polysaccharide stands out as an alternative to the management of postharvest diseases. And also for its potential in various uses, such as food, biotechnology, pharmaceuticals and agriculture (FREDDO et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

Mangifera Indica Postharvest: Evaluation of the Potential of Alternative Treatments to Control Anthracnose

Maia

Demartelaere²,

Silva

et al. 2020

BJD

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A quitosana como fungistático no crescimento micelial de Rhizoctonia solani Kuhn

Cited by 11 publications

References 10 publications

Inhibition of Mycelial Growth of Rhizoctonia Solani by Chitosan in vitro and in vivo

Inhibition of Mycelial Growth of Rhizoctonia Solani by Chitosan in vitro and in vivo

Preparo e caracterização de filmes comestíveis de quitosana

Mangifera Indica Postharvest: Evaluation of the Potential of Alternative Treatments to Control Anthracnose

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