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Biblioteca(s): |
Embrapa Acre; Embrapa Agropecuária Oeste; Embrapa Algodão; Embrapa Amazônia Ocidental; Embrapa Amazônia Oriental; Embrapa Arroz e Feijão; Embrapa Clima Temperado; Embrapa Hortaliças; Embrapa Semiárido; Embrapa Unidades Centrais. MenosEmbrapa Acre; Embrapa Agropecuária Oeste; Embrapa Algodão; Embrapa Amazônia Ocidental; Embrapa Amazônia Oriental; Embrapa Arroz e Feijão; Embrapa Clima Temperado; Embrapa Hortaliças; Embrapa Semiárido; Embrapa Unidades Centrais... Mostrar Todas |
Data corrente: |
17/05/1993 |
Data da última atualização: |
07/11/2001 |
Autoria: |
KRANZ, J. (Ed.). |
Título: |
Epidemics of plant diseases: mathematical analysis and modeling. |
Ano de publicação: |
1974 |
Fonte/Imprenta: |
Berlin: Springer-Verlag, 1974. |
Páginas: |
170 p. |
Série: |
(Ecological Studies, 13). |
ISBN: |
3-540-06896-1 |
Idioma: |
Inglês |
Conteúdo: |
The role and scope of mathematical analysis and modeling in epidemiology. Automatic data processing in analyses of epidemics. Multiple regression analysis in the epidemiology of plant diseases. Non-linear diseases progress curves. Simulation of epidemics. |
Palavras-Chave: |
Analysis; Computacao; Computer; Control; Controle; Disease; Diseases; Epidemics; Fitopatologia; Language; Linguagem; Mathematical; Modelo; Multipla regressão; Plant; Plant disease; Plant diseases; Plants; Statistic. |
Thesagro: |
Análise; Doença; Doença de Planta; Ecologia; Epidemia; Epidemiologia; Estatística; Matemática; Modelo Matemático; Planta; Solo. |
Thesaurus Nal: |
ecology; epidemiology; mathematical models; mathematics; models; soil; statistical analysis. |
Categoria do assunto: |
-- F Plantas e Produtos de Origem Vegetal |
Marc: |
LEADER 01648nam a2200589 a 4500 001 1208957 005 2001-11-07 008 1974 bl uuuu 00u1 u #d 020 $a3-540-06896-1 100 1 $aKRANZ, J. (Ed.). 245 $aEpidemics of plant diseases$bmathematical analysis and modeling. 260 $aBerlin: Springer-Verlag$c1974 300 $a170 p. 490 $a(Ecological Studies, 13). 520 $aThe role and scope of mathematical analysis and modeling in epidemiology. Automatic data processing in analyses of epidemics. Multiple regression analysis in the epidemiology of plant diseases. Non-linear diseases progress curves. Simulation of epidemics. 650 $aecology 650 $aepidemiology 650 $amathematical models 650 $amathematics 650 $amodels 650 $asoil 650 $astatistical analysis 650 $aAnálise 650 $aDoença 650 $aDoença de Planta 650 $aEcologia 650 $aEpidemia 650 $aEpidemiologia 650 $aEstatística 650 $aMatemática 650 $aModelo Matemático 650 $aPlanta 650 $aSolo 653 $aAnalysis 653 $aComputacao 653 $aComputer 653 $aControl 653 $aControle 653 $aDisease 653 $aDiseases 653 $aEpidemics 653 $aFitopatologia 653 $aLanguage 653 $aLinguagem 653 $aMathematical 653 $aModelo 653 $aMultipla regressão 653 $aPlant 653 $aPlant disease 653 $aPlant diseases 653 $aPlants 653 $aStatistic
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Embrapa Arroz e Feijão (CNPAF) |
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Registro Completo
Biblioteca(s): |
Embrapa Agroindústria de Alimentos. |
Data corrente: |
18/05/2023 |
Data da última atualização: |
14/12/2023 |
Tipo da produção científica: |
Resumo em Anais de Congresso |
Autoria: |
RODRIGUES, J. P.; COELHO, C. C. DE S.; HIDALGO CHÁVEZ, D. W.; AMANCIO, D.; SOARES, A. G.; FREITAS-SILVA, O. |
Afiliação: |
JULIANA PEREIRA RODRIGUES, UNIRIO; CAROLINE CORRÊA DE SOUZA COELHO, UNIRIO; DAVY WILLIAM HIDALGO CHÁVEZ, UFRRJ; DAIANA AMANCIO, UNIRIO; ANTONIO GOMES SOARES, CTAA; OTNIEL FREITAS SILVA, CTAA. |
Título: |
Development and characterization of biocomposite films based on alginate and chitosan for use as postharvest fruit packaging. |
Ano de publicação: |
2023 |
Fonte/Imprenta: |
In: CONFERÊNCIA INTERNACIONAL DE PROTEÍNAS E COLOIDES ALIMENTARES, 9., 2023, Rio de Janeiro. Anais... Campinas, Galoá, 2023. |
Idioma: |
Inglês |
Notas: |
Poster 157716.Eixo temático: Colóides para filmes comestíveis. CIPCA. |
Conteúdo: |
Postharvest diseases caused by fungi are reported as one of the main causes of food loss, mainly in the fruit and vegetable (FV) sector. Antimicrobials, such as zinc oxide nanoparticles (ZnOnano) and sodium benzoate (SB), have shown good results as postharvest technology for the FV sector, increasing the food shelf life and reducing losses. This work aimed to develop and characterize films made from sodium alginate and chitosan composites, incorporated with ZnOnano or SB to be used as postharvest fruit packaging. To develop the composite film-forming solutions of alginate (2% m/v) and chitosan (1% m/v) were prepared and mixed in a 9:1 ratio (alginate/chitosan). The alginate crosslinking process was carried out before mixing by crosslinking the polymer with calcium chloride at two different concentrations (0.375% or 0.5%). ZnOnano < 50 nm (0.5 mg/mL) or SB (30 mg/L) were added to the filmogenic solution, plated into Petri dishes, and dried in air circulation oven at 40°C/16 h. The different films obtained were analyzed for their visual appearance, color, opacity, thickness, mechanical properties, humidity, and solubility in water. The statistical analysis was performed by two-way ANOVA, Tukey, and Scott-Knott with 5% of significance. The studied polymeric composition provided plastic and flexible films, with a homogeneous visual appearance regardless of the crosslinking agent concentration or the addition of different antimicrobials. The films added with ZnOnano presented more cohesive appearance than the other films and all of them presented a yellowish color tone, provided by the higher alginate proportion used in the formulation, where the parameter b*, which measures the variation between shades of blue and yellow, showed positive values between 9.31 ± 0.789 and 11.5 ± 3.37. The films showed high transparency, confirmed by the values of low opacity600 nm, lying between 0.99 ± 0,08 and 2.35 ± 1,03. The crosslinking process and the addition of ZnOnano could change the film's physical properties, leaving them with less thickness, higher rupture tension, lower elongation at break, and higher Young's modulus, when compared to non-crosslinked films and without the addition of antimicrobials. The average moisture content of films with lower crosslinking (18.7 ± 1.241%) was higher when compared to the average of films with higher crosslinking (17.11 ± 0.586%). The films incorporated by different antimicrobial agents also showed significant moisture averages when compared to films without them. The addition of antimicrobial agents probably increased the hygroscopicity of the films, and the cross-linking agent concentration did not influence this variable. All films were highly soluble in water (54.9 ± 3.55 - 80.9 ± 11.4%) after 24h indicating that the crosslinking process and the change in the film's structure with ZnOnano, were not enough to make them less soluble. Despite the structural change that occurred in the films with crosslinking and the addition of ZnOnano, new experiments need to be performed, increasing the concentration of the crosslinking agent to reduce the solubility of the films and enable their use as food packaging. MenosPostharvest diseases caused by fungi are reported as one of the main causes of food loss, mainly in the fruit and vegetable (FV) sector. Antimicrobials, such as zinc oxide nanoparticles (ZnOnano) and sodium benzoate (SB), have shown good results as postharvest technology for the FV sector, increasing the food shelf life and reducing losses. This work aimed to develop and characterize films made from sodium alginate and chitosan composites, incorporated with ZnOnano or SB to be used as postharvest fruit packaging. To develop the composite film-forming solutions of alginate (2% m/v) and chitosan (1% m/v) were prepared and mixed in a 9:1 ratio (alginate/chitosan). The alginate crosslinking process was carried out before mixing by crosslinking the polymer with calcium chloride at two different concentrations (0.375% or 0.5%). ZnOnano < 50 nm (0.5 mg/mL) or SB (30 mg/L) were added to the filmogenic solution, plated into Petri dishes, and dried in air circulation oven at 40°C/16 h. The different films obtained were analyzed for their visual appearance, color, opacity, thickness, mechanical properties, humidity, and solubility in water. The statistical analysis was performed by two-way ANOVA, Tukey, and Scott-Knott with 5% of significance. The studied polymeric composition provided plastic and flexible films, with a homogeneous visual appearance regardless of the crosslinking agent concentration or the addition of different antimicrobials. The films added with ZnOnano presented mor... Mostrar Tudo |
Palavras-Chave: |
Biocomposite; Postharvest. |
Thesaurus NAL: |
Nanoparticles. |
Categoria do assunto: |
-- |
Marc: |
LEADER 04021nam a2200217 a 4500 001 2153819 005 2023-12-14 008 2023 bl uuuu u00u1 u #d 100 1 $aRODRIGUES, J. P. 245 $aDevelopment and characterization of biocomposite films based on alginate and chitosan for use as postharvest fruit packaging.$h[electronic resource] 260 $aIn: CONFERÊNCIA INTERNACIONAL DE PROTEÍNAS E COLOIDES ALIMENTARES, 9., 2023, Rio de Janeiro. Anais... Campinas, Galoá$c2023 500 $aPoster 157716.Eixo temático: Colóides para filmes comestíveis. CIPCA. 520 $aPostharvest diseases caused by fungi are reported as one of the main causes of food loss, mainly in the fruit and vegetable (FV) sector. Antimicrobials, such as zinc oxide nanoparticles (ZnOnano) and sodium benzoate (SB), have shown good results as postharvest technology for the FV sector, increasing the food shelf life and reducing losses. This work aimed to develop and characterize films made from sodium alginate and chitosan composites, incorporated with ZnOnano or SB to be used as postharvest fruit packaging. To develop the composite film-forming solutions of alginate (2% m/v) and chitosan (1% m/v) were prepared and mixed in a 9:1 ratio (alginate/chitosan). The alginate crosslinking process was carried out before mixing by crosslinking the polymer with calcium chloride at two different concentrations (0.375% or 0.5%). ZnOnano < 50 nm (0.5 mg/mL) or SB (30 mg/L) were added to the filmogenic solution, plated into Petri dishes, and dried in air circulation oven at 40°C/16 h. The different films obtained were analyzed for their visual appearance, color, opacity, thickness, mechanical properties, humidity, and solubility in water. The statistical analysis was performed by two-way ANOVA, Tukey, and Scott-Knott with 5% of significance. The studied polymeric composition provided plastic and flexible films, with a homogeneous visual appearance regardless of the crosslinking agent concentration or the addition of different antimicrobials. The films added with ZnOnano presented more cohesive appearance than the other films and all of them presented a yellowish color tone, provided by the higher alginate proportion used in the formulation, where the parameter b*, which measures the variation between shades of blue and yellow, showed positive values between 9.31 ± 0.789 and 11.5 ± 3.37. The films showed high transparency, confirmed by the values of low opacity600 nm, lying between 0.99 ± 0,08 and 2.35 ± 1,03. The crosslinking process and the addition of ZnOnano could change the film's physical properties, leaving them with less thickness, higher rupture tension, lower elongation at break, and higher Young's modulus, when compared to non-crosslinked films and without the addition of antimicrobials. The average moisture content of films with lower crosslinking (18.7 ± 1.241%) was higher when compared to the average of films with higher crosslinking (17.11 ± 0.586%). The films incorporated by different antimicrobial agents also showed significant moisture averages when compared to films without them. The addition of antimicrobial agents probably increased the hygroscopicity of the films, and the cross-linking agent concentration did not influence this variable. All films were highly soluble in water (54.9 ± 3.55 - 80.9 ± 11.4%) after 24h indicating that the crosslinking process and the change in the film's structure with ZnOnano, were not enough to make them less soluble. Despite the structural change that occurred in the films with crosslinking and the addition of ZnOnano, new experiments need to be performed, increasing the concentration of the crosslinking agent to reduce the solubility of the films and enable their use as food packaging. 650 $aNanoparticles 653 $aBiocomposite 653 $aPostharvest 700 1 $aCOELHO, C. C. DE S. 700 1 $aHIDALGO CHÁVEZ, D. W. 700 1 $aAMANCIO, D. 700 1 $aSOARES, A. G. 700 1 $aFREITAS-SILVA, O.
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