Modelado del Efecto de la Temperatura, Actividad de Agua y pH sobre el Crecimiento de Rhizopus oryzae

Carrillo, M.L; Zavala, D; Alvarado, Brenda

doi:10.4067/s0718-07642007000400009

Cited by 5 publications

(2 citation statements)

References 10 publications

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“…Fungi growth curve is obtained when charting the diameter of the colonies versus the time and they adjusted with the DMfit program that uses Baranyi model (equation 1) to determine the growing parameters [17] growing speed, latency period and maximum growing.…”

Section: Fungi Growth Curvementioning

confidence: 99%

FUNGICIDE PROPERTIES in Vitro OF CHITOSAN ETHYL CARBAMATE IN THE CONTROL OF VINEYARDS FUNGIES IN CHILE

Cárdenas-Triviño

Vergara-González

Salamanca

2018

J. Chil. Chem. Soc.

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The grape table is the main fresh fruit export of Chile. However, is affected in the first place by fungal pathogens, resulting between 10 % and 15 % losses in production. The commercial use of biocides has a weakness generating an increase in demand for new antifungal agents. Chitosan and carbamate possess fungicidal properties;therefore the aim of this paper is to analyze the fungicidal activity of chitosan ethylcarbamate. In vitro bioassays were carried out to evaluate the effectiveness of the fungicide to control Botrytis cinerea and Fusarium spp. fungies. The chemical composition of chitosan ethylcarbamate was determined previously. The fungi growth curves and fit with the program DMfit, which uses the Baranyi model to obtain the growth parameters were studied. Then, we estimated the MIC (minimum inhibitory concentration) by a microdilution method. These data were analyzed by simple linear regression. Growth parameters of Fusarium spp shows a growth rate of 1.3 h-1 , and Botrytis cinerea of 0.9 h-1 , respectively. Chitosan ethylcarbamate with a MIC of 1250 mg/L on Fusarium spp. and B. cinerea a MIC of 1250 mg/L were obtained. Finally, the chitosan ethyl carbamate fungicide, biodegradable, is a more ecological alternative to the conventional fungicides such as Iprodione, Zineb, Nabam, Maneb and the traditional Bordeaux mixture.

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Section: Fungi Growth Curvementioning

confidence: 99%

FUNGICIDE PROPERTIES in Vitro OF CHITOSAN ETHYL CARBAMATE IN THE CONTROL OF VINEYARDS FUNGIES IN CHILE

Cárdenas-Triviño

Vergara-González

Salamanca

2018

J. Chil. Chem. Soc.

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“…No obstante, dicho modelo es muy simple y no siempre permite obtener una buena representación de los datos de crecimiento del microorganismo. Con el propósito de alcanzar un mayor grado de ajuste a los datos experimentales, autores como Zwietering et al (1990) han propuesto otros modelos como alternativa al de Monod; los autores evaluaron diferentes funciones sigmoidales y encontraron que estadísticamente la función de Gompertz y la función logística describen adecuadamente el crecimiento de los microorganismos (Carrillo et al, 2007). Sin embargo, el modelo de Baranyi es cada vez más popular y diversos estudios lo postulan como el mejor (Zhao et al, 2014).…”

Section: Introductionunclassified

Correlación del Crecimiento de Pseudomonas fluorescens en la Producción de Polihidroxialcanoatos de Cadena Media (PHA MCL) mediante Modelos Primarios de Gompertz, Logístico y Baranyi

Vanegas

Ramírez

2016

Inf. tecnol.

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ResumenEn este trabajo se analizan modelos para correlacionar el crecimiento de Pseudomonas fluorescens, un bacilo Gram-negativo, en la producción de polihidroxialcanoatos de cadena media (PHA MCL ). Se evaluó la melaza y la glucosa como fuente de carbono, por medio del crecimiento y producción del biopolímero; se encontró que la melaza a concentraciones por debajo de 60 g/L y 10 g/L de azúcares reductores promueve el crecimiento y producción de Polihidroxialcanoatos de cadena media. El modelado del crecimiento de Pseudomonas fluorescens se realizó empleando los modelos cinéticos primarios de Gompertz, logístico y Baranyi. Se evaluaron los parámetros cinéticos de crecimiento tales como tiempo de latencia (λ), máxima velocidad específica de crecimiento (μ max ) y concentración celular máxima (y max ). Los modelos de Gompertz y Baranyi presentaron un mejor ajuste en relación al modelo logístico; se encontraron diferencias entre el modelo de Gompertz y Baranyi en valores encontrados para el tiempo de latencia. Sin embargo, los tres modelos utilizados presentaron un buen ajuste con un R 2 superior a 0,98 en todos los casos evaluados. Palabras clave: Pseudomonas fluorescens; cinética de crecimiento; metabolito secundario; melaza; polihidroxialcanoatos de cadena media; PHA MCL Correlation of Pseudomonas fluorescens Growth in the Production of Medium Chain Length Polyhydroxy-alkanoates (PHA MCL ) by Gompertz, Logistic and Baranyi Primary Models AbstractIn this work, models to correlate the growth of Pseudomonas fluorescens (a gram negative rod shaped bacterium) in the production of medium chain length polyhydroxy-alkanoates (PHA MCL ) are analyzed. Sugarcane molasses and glucose were evaluated as carbon source by the cellular growth and production of polyhydroxyalcanoates. It was found that the molasses at concentrations lower than 60 g/L and 10 g/L of reducing sugars promotes the polihydroxialcanoate production of medium length chain. Prediction of Pseudomonas fluorescens growth was done using the primary kinetic models of Gompertz, Logistic and Baranyi. Growing kinetic parameters, such as latency (λ), maximum specific growth rate (μ max ), and maximum cell concentration (y max ), were determined. Gompertz and Baranyi models showed the best fit to the experimental results, exhibiting some discrepancies in latency values. However, the three models show a correlation value R 2 higher than 0.98.

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Estimation of Listeria monocytogenes survival during thermoultrasonic treatments in non-isothermal conditions: Effect of ultrasound on temperature and survival profiles

et al. 2015

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Modelado del Efecto de la Temperatura, Actividad de Agua y pH sobre el Crecimiento de Rhizopus oryzae

Cited by 5 publications

References 10 publications

FUNGICIDE PROPERTIES in Vitro OF CHITOSAN ETHYL CARBAMATE IN THE CONTROL OF VINEYARDS FUNGIES IN CHILE

FUNGICIDE PROPERTIES in Vitro OF CHITOSAN ETHYL CARBAMATE IN THE CONTROL OF VINEYARDS FUNGIES IN CHILE

Correlación del Crecimiento de Pseudomonas fluorescens en la Producción de Polihidroxialcanoatos de Cadena Media (PHA MCL) mediante Modelos Primarios de Gompertz, Logístico y Baranyi

Estimation of Listeria monocytogenes survival during thermoultrasonic treatments in non-isothermal conditions: Effect of ultrasound on temperature and survival profiles

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