Consulta: subjectFacets:"Water activity"
Registros recuperados: 24
Data/hora: 05/06/2024 00:57:54

Parámetros de evaluación de conservas a base de piña y carambolo.
Provedor de dados: 32
Autores: Dávila Lezama, María del Rosario.
Existe poca información referente a conservas como tal, contrariamente la información relativa a mermeladas y jaleas es abundante. Por lo anterior, el marco teórico que compone esta tesis, se basa en información relativa a mermeladas. Las mermeladas tradicionalmente se caracterizan por ser alimentos de alta densidad energética, con propiedades sensoriales muy atractivas para los consumidores por su sabor, aroma, color y su estabilidad durante el almacenamiento. En el presente trabajo, los parámetros que nos permitieron evaluar una conserva fueron °Brix, pH, actividad de agua (aw) y viscosidad. Al analizar los parámetros de los tratamientos realizados podemos considerar que los tratamientos T3 y T4 de carambolo 60% - piña 40% cumplen con las características...
Palavras-chave: Mermeladas; Grados Brix; Actividad de agua; PH; Pectina; Jam; Sugar concentration; Water activity; Pectin; Maestría Tecnológica; Agroindustria.
Ano: 2010
URL: http://hdl.handle.net/10521/325

Production of lignocellulolytic enzymes by Aspergillus niger biofilms at variable water activities
Provedor de dados: 69
Autores: Villena,Gretty K; Gutiérrez-Correa,Marcel.
Lignocellulolytic enzyme production by Aspergillus niger was compared both in submerged fermentation (SF) and biofilm fermentation (BF) at varying water activities. Maximal filter paper activity, endoglucanase and xylanase activities were much higher in BF (2.96, 4.7 and 4.61 IU ml-1, respectively) than in SF cultures (1.71, 1.31 and 2.3 IU ml-1, respectively) but biomass yields were lower in BF than in SF (0.338 g g-1 and 0.431 g g-1, respectively). In the presence of 20% ethylene glycol (a w = 0.942) the enzyme activities decreased in both systems but BF still had higher levels (1.0, 1.0 and 2.6 IU ml-1, respectively) than SF cultures (0.6, 0.7 and 1.5 IU ml-1, respectively). An increase in xylanase specific activity of more than 2 fold (from 4.2 to 10.2...
Tipo: Journal article
Palavras-chave: Biofilm; Cellulase; Ethylene glycol; Water activity; Xylanase.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100012

Effect of methyl branching of C8H18 alkanes and water activity on lipase-catalyzed enantioselective esterification of ibuprofen
Provedor de dados: 69
Autores: Gottemukkala,Vijay V; Saripella,Kalyan K; Kadari,Anil K; Neau,Steven H.
The purpose of this research was to study the effect of the methyl branching of a high log P alkane solvent and the water activity in the organic medium on the initial rate and the enantioselectivity of ibuprofen esterification catalyzed by Candida rugosa lipase. Resolution of ibuprofen is important because S-(+)-ibuprofen has the desired pharmacological activity, whereas the R-(-)-enantiomer causes much of the side effects. The Candida rugosa lipase-catalyzed reaction in isooctane at 40ºC and 0.73 water activity gave the best results, both in terms of the initial reaction rate and the enantioselectivity of the reaction. An increase in water activity allowed a higher reaction rate and enantiomeric excess in each of the four solvents. An increase in methyl...
Tipo: Journal article
Palavras-chave: Enantioselective; Esterification; Ibuprofen; Lipase; Solvent-effect; Water activity.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100002

USE OF AIC AND BIC IN DESORPTION ISOTHERMS OF TAMARIND SEEDS (Tamarindus indica L.)
Provedor de dados: 70
Autores: Ferreira Junior,Weder N.; Resende,Osvaldo; Pinheiro,Gleyce K. I.; Silva,Ligia C. de M.; Costa,Eduarda R.
ABSTRACT The knowledge of hygroscopicity is essential for the storage of tamarind seeds, but there is a limitation of a judicious statistical parameter to define the best mathematical model to adjust the isotherms of plant products. Therefore, this study aimed to determine the desorption isotherms of tamarind seeds and test the Akaike information criterion (AIC) and Schwarz Bayesian information criterion (BIC) for choosing the best mathematical model. Seeds with an initial moisture content of 21.00 ± 0.10% dry basis (db) were dried at 45 °C until they reached moisture contents of 17.27 ± 0.10, 15.04 ± 0.16, 14.14 ± 0.06, 12.41 ± 0.17, and 10.52 ± 0.12% db. The water activity of the product was determined by the static-indirect method at temperatures of 10,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water activity; Hygroscopicity; Cavalcanti Mata.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000400511

FITTINGS OF ADSORPTION ISOTHERM MODELS AND THERMODYNAMIC PROPERTIES OF URUNDAY SEEDS
Provedor de dados: 70
Autores: Isquierdo,Eder P.; Caldeira,Daniela S. A.; Siqueira,Valdiney C.; Martins,Elton A. S.; Quequeto,Wellytton D.
ABSTRACT This study aimed to obtain and evaluate thermodynamic properties and hygroscopic equilibrium isotherms of urunday seeds as a function of air relative humidity and temperature, as well as identify the best-fitted mathematical models for adsorption phenomenon. A static-gravimetric method was used to obtain hygroscopic equilibrium moisture content. Seeds were placed in airtight containers with different saturated saline solutions for relative humidity control. These were then kept in BOD incubator chambers at 10, 20, 30, and 40 °C. Hygroscopic equilibrium moisture content decreased as temperature increased, for the same water activity. The Sigma-Copace model best-fitted seed adsorption data for equilibrium water activity intervals between 0.1129 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water activity; Isokinetic; Sorption isotherms; Myracrodruon urundeuva; Relative humidity.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000300374

Water sorption isotherms of Beauveria bassiana (Bals.) Vuill. Conidia
Provedor de dados: 82
Autores: Silva,Roberta Z. da; Neves,Pedro M.J.O.; Yamashita,Fábio; Santoro,Patrícia H.
One of the requirements for successful commercial production of biological control agent is the maintenance of viability for long periods at room temperature, increasing shelf life. The water activity (Aw) is an important parameter to study the stability in the storage of dehydrated products but its determination demands equipments not always available. The water sorption isotherms correlate the Aw with the moisture of a product; adsorption isotherm is important to define the packaging system, and desorption isotherm the drying process. The objective of this study was to determine the sorption isotherms of Beauveria bassiana conidia and adjust them using a mathematical model. The adsorption and desorption were determined by gravimetric technique at 25°C...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Entomopathogenic; Biological control; Storage; Water activity; Moisture.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2003000200023

Effect of Sodium Chloride Replacement with Potassium Chloride on Quality Traits of Bicarbonate-Marinated Turkey Breast Meat
Provedor de dados: 89
Autores: Mudalal,S; Petracci,M.
ABSTRACT This study aims to evaluate the possibility to formulate low-sodium bicarbonate-marinated turkey breast meat. In total, 60 meat cuts (100 × 50 × 30mm) were divided into four treatments: B1 (0.5% sodium bicarbonate and 0% sodium chloride replacement), B2 (0.5% sodium bicarbonate and 15% sodium chloride replacement), B3 (0.5% sodium bicarbonate and 30% sodium chloride replacement), and B4 (0.5% sodium bicarbonate and 45% sodium chloride replacement). The results showed that sodium replacement up to 45% had no impact on texture (as represented by Allo-Kramer shear values) and water activity. After cooking, Group B1 exhibited the highest L* value (72.1) and the lowest b* (6.6) when compared to other groups. In conclusion, replacing sodium chloride...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical composition; Water activity; Texture; Sensory.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000300316

Mathematical modeling of the drying of orange bagasse associating the convective method and infrared radiation
Provedor de dados: 91
Autores: Sánchez-Sáenz,Carolina M.; Nascimento,Vânia R. G.; Biagi,João D.; Oliveira,Rafael A. de.
ABSTRACT Mathematical modeling enables dimensioning of dryers, optimization of drying conditions and the evaluation of process performance. The aim of this research was to describe the behavior of orange bagasse drying using Page's and Fick's second law models, and to assess activation energy (using Arrhenius equation), moisture content, water activity and bulk density of product at the end of the process. The drying experimental assays were performed in 2011 with convective air temperature between 36 and 64 ºC and infrared radiation application time in the range from 23 to 277 s in accordance with the experimental central composite rotatable design. Analysis of variance and F-test were applied to results. At the end of the drying process, moisture content...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Effective diffusivity; Water activity; Fick’s model; Page’s model; Activation energy.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015001201178

Determination of desorption isotherms, latent heat and isosteric heat of pequi diaspore
Provedor de dados: 91
Autores: Sousa,Kelly A. de; Resende,Osvaldo; Carvalho,Bruno de S.
ABSTRACT The objective was to determine water sorption isotherms of diaspores of pequi fruits in order to obtain information on the amount of water that this product desorbs at the temperatures of 10, 20, 30 and 40 °C and water activities from 0.20 to 0.89, adjusting different mathematical models to experimental data, and to determine its latent heat and isosteric heat. The equilibrium moisture content was obtained through the indirect static method, using the device Hygropalm Model Aw 1. The Modified Henderson model was the one that best fitted the data and was selected to predict the equilibrium moisture content of pequi diaspore. It was observed that the higher the temperature for the same equilibrium moisture content (% d.b.), the higher the water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hygroscopic equilibrium; Water activity; Thermodynamic properties.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000500493

Isotherms and isostatic heat of foam-mat dried yellow mombin pulp
Provedor de dados: 91
Autores: Cavalcante,Maisa D.; Plácido,Geovana R.; Oliveira,Daniel E. C. de; Freitas,Bheatriz S. M. de; Cagnin,Caroline; Oliveira,Déborah de S.
ABSTRACT Yellow mombin has high nutritional value but is very perishable. Foam mat drying is a method that has been widely used to preserve liquid and semi-solid powdered foods. In this context, the aim of this study was to determine desorption isotherms and isosteric heat of yellow mombin (Spondias mombin L.) foam for different conditions of temperature and water activity. Powdered yellow mombin pulp was obtained by drying in forced-air oven regulated to 60 ° C. The indirect static method was used to determine the isotherms and isosteric heat, whereas water activity (aw) was determined using the Hygropalm-HP23AW-A analyzer. A B.O.D. incubator, set at 10, 20, 30 and 40 °C, was used to control the temperature, and the water activity for each temperature was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water activity; Isosteric heat; Hygroscopicity; Mathematical modeling; Spondias mombin L.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000600436

Hygroscopicity of ‘sucupira-branca’ (Pterodon emarginatus Vogel) fruits
Provedor de dados: 91
Autores: Oliveira,Daniel E. C. de; Resende,Osvaldo; Costa,Lílian M.; Silva,Glicélia P.; Sales,Juliana de F.
ABSTRACT ‘Sucupira-branca’ (Pterodon emarginatus Vogel) is a tree from ‘Cerrado’ and stands out mainly for its pharmacological properties; however, there are no technological information about its post-harvest operations. Thus, the aim of this study was to determine the sorption isotherms of ‘sucupira-branca’ fruits for different air conditions and obtain the values of desorption isosteric heat, depending on the equilibrium moisture content of the product. The equilibrium moisture content of ‘sucupira-branca’ fruits was determined by dynamic method for temperatures of 25, 30, 35 and 40 °C and water activities for each temperature between 0.270 and 0.775. The models Chung-Pfost, Copace, Modified Halsey, Oswin Modified and Sigma Copace obtained high...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Equilibrium moisture content; Isotherms; Water activity; Isosteric heat; Copace.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000400285

Design, development and performance of solar dryer for pineapple (Ananas comosus (L.) Merr.), mamey (Mammea americana L.) and banana (Musaparadisiaca L.) fruit drying
Provedor de dados: 109
Autores: Macías-Ganchozo,Edgar Ruperto; Bello-Moreira,Italo Pedro; Trueba-Macías,Sabrina Liz; Anchundia-Muentes,Xavier Enrique; Anchundia-Muentes,Manuel Eduardo; Bravo-Moreira,Celio Danilo.
Abstract The aim of the present research was to know the shelf life of dehydrated tropical fruits based on an indirect type solar dryer, which was designed and developed under the conditions of Calceta, Bolívar canton of Manabí province, Ecuador. Due to the banana fruit physical and chemical characteristics exhibited during the process of dehydration by radiation, satisfactory results were obtained, superior to those obtained in fruits of mamey and pineapple. For example, moisture in banana with 80.22% dropped to 10.35%; in relation to protein ratio, which had achieved an increasing from 1.27% in its fresh state to 2.18% and in fiber contents from 0.88% in its fresh state to 2.41%. The microbiological analyzes determined the shelf life of the estimated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Absorption; Convective multi-flash drying process (CMDF); Fruit dehydration; Fruit postharvest; Solar energy; Water activity.
Ano: 2018
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000100030

Assessment of physical and physicochemical quality of main chocolates traded in Peru
Provedor de dados: 109
Autores: Chire-Fajardo,Gabriela Cristina; Valdivia-Arrunategui,Rocío Alicia; Orihuela-Rivera,Carmen Adela; Ureña- Peralta,Milber Oswaldo.
Abstract: The quality of the main chocolates marketed in Peru was determined. The physical aspect: color (C *, H *, IB), hardness and particle size, as well as physicochemical: water activity (aw), moisture, fat and ash, correlating with the declaration of ingredients presented in the packaging. We evaluated 30 experimental units of chocolates (imported, domestic, dark chocolate and milk) by experimental methods, randomly acquired from different establishments. The difference between color and hardness by origin was attributed to the dairy component. Dark chocolate had lower values of color components (8.75 ± 0.94 C *, 7.60 ± 4.71 H * and 28.46 ± 0.86 IB) than milk constituents (15.04 ± 2.78 C, 34.59 ± 7.46 H * and 34.55 ± 2.87 IB) and in hardness values...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ash; Color; Fat; Moisture; Particle size; Texture; Water activity.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000200164

Optimization of Process Variables for Osmo- freeze drying  of Strawberry Slices Using Response Surface Methodology
Provedor de dados: 111
Autores: KUMAR, VISHAL.
The production of high-quality Osmo freeze-dried strawberry slices was studied by response surface methodology. The osmotic treatment and experiment were conducted according to Box-Bohnken Design. The low and high levels of the process variables were 40% (w/w) and 60% (w/w) for sucrose concentration of osmotic solution; 2 and 4 mm for slice thickness and - 10 and -30 0C for operating temperatures in freeze dryer. Responses studied comprised final moisture content (M), colour Index (L), water activity (aw), rehydration ratio (RR) and overall acceptability (Oa). It was found that effects of all the process variables were significant on all responses. Optimum conditions (desirability = 0.692) obtained by numerical optimization were 51% sucrose concentration;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Osmotic; Freeze; Rehydration; Hardness; Colour; Water activity.
Ano: 2020
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5587

Moisture sorption isotherms of Mesquite seed (Prosopis africana)
Provedor de dados: 111
Autores: Ade, Ayokanmi Remi; Ajav, E A; Raji, Abdulganiy O; Adetayo, Seun Ayodele; Arowora, Kayode Adebisi.
Moisture profoundly influences product attributes such as quality and safety. The knowledge of moisture sorption isotherm is essential to determine products stability, and needed for design of storage, packaging and drying systems for extension of shelf lives. This study is to develop sorption isotherms of Prosopis africana.The moisture sorption isotherms of the seed were determined at temperatures of 20ºC, 25ºC and 30ºC, over a relative humidity range of 11%-100% using the static gravimetric technique. A linear regression programme was used to fit five isotherm models; GAB, Oswin, Halsey, Henderson, and Chung Pfost to the experimental data and compared using the root mean standard error, regression coefficient, standard error of estimate, and randomness...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agrricultural Engineering Prospis africana; Equilibrium moisture content; Water activity; Adsorption; And desorption.
Ano: 2016
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3727

Chemical basis for beef charqui meat texture
Provedor de dados: 52
Autores: Youssef,Elza Y.; Garcia,Carlos Eduardo Rocha; Yamashita,Fábio; Shimokomaki,Massami.
This work evaluated the relationship of charqui meat (CHM) chemical composition with the tenderness throughout its production. CHM was prepared from beef Vastus lateralis of 4-5 years old. Shear force of fresh CHM showed an approx. 3-fold increase in toughness compared to the raw material while, in the case of cooked CHM it was 6-fold increased in relation to the raw charqui. The moisture content decreased by 39.0 and 58.0% (p&lt;0.05) for uncooked and cooked CHM, respectively, in relation to the raw material. Mathematical modeling of the influence of these meat components showed that shear force increased exponentially with the loss of moisture. The texture of CHM was the result of a multitude of factors involving myofibril proteins which promoted dynamic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Collagen crosslinking; Water activity; Intermediate moisture meat product; Myofibril proteins.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000400018

Effect of moisture content and inoculum on the growth and conidia production by Beauveria bassiana on wheat bran
Provedor de dados: 52
Autores: Nuñez-Gaona,Oscar; Saucedo-Castañeda,Gerardo; Alatorre-Rosas,Raquel; Loera,Octavio.
The aim of the present work was to study the effect of moisture content and inoculum on the growth and conidia production by Beauveria bassiana on wheat bran (WB).The highest growth rate of B. bassiana 885.2 on WB media was obtained at a w=1.0, with no detected growth at a w &lt; 0.97. Solid-state fermentation (SSF) using WB (66% moisture; a w=1.0) achieved a maximal yield of 1.18x10 10 conidia per gram of dry substrate (gds). This yield decreased one order of magnitude with higher moisture contents or the addition of sugarcane bagasse (SCB) as a texturiser. In SSF using WB (66% humidity),the time to obtain a yield of 1x10(10) conidia/gds, referred to as t10, could be predicted using a model considering common inoculum levels and maximal yields. For...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beauveria bassiana; Wheat bran; Water activity; Texturiser; Conidial yields.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000400004

Growth of Byssochlamys nivea in pineapple juice under the effect of water activity and ascospore age
Provedor de dados: 58
Autores: Zimmermann,M; Miorelli,S; Massaguer,P.R; Aragão,G.M.F.
The study of thermal resistant mould, including Byssochlamys nivea, is of extreme importance since it has been associated with fruit and fruit products. The aim of this work is to analyze the influence of water activity (a w) and ascospore age (I) on the growth of Byssochlamys nivea in pineapple juice. Mold growth was carried out under different conditions of water activity (a w) (0.99, 0.96, 0.95, 0.93, 0.90) and ascospore age (I) (30, 51, 60, 69, 90 days). Growth parameters as length of adaptation phase (λ), maximum specific growth rate (µmax) and maximum diameter reached by the colony (λ) were obtained through the fit of the Modified Gompertz model to experimental data (measuring radial colony diameter). Statistica 6.0 was used for statistical analyses...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Byssochlamys nivea; Mould growth; Pineapple juice; Water activity; Ascospore age.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000100025

Effect of combined function of temperature and water activity on the growth of Vibrio harveyi
Provedor de dados: 58
Autores: Zhou,Kang; Gui,Meng; Li,Pinglan; Xing,Shaohua; Cui,Tingting; Peng,Zhaohui.
Vibrio harveyi is considered as a causative agent of the systemic disease, vibriosis, which occurs in many biological fields. The effects of temperatures (12.9-27.1 ºC) and water activity (NaCl% 0.6%-3.4%) on V. harveyi were investigated. The behavior and growth characteristics of V. harveyi was studied and modeled. Growth curves were fitted by using Gompertz and Baranyi models, and the Baranyi model showed a better fittness. Then, the maximum growth rates (µmax) and lag phase durations (LPD, λ) obtained from both Gompertz and Baranyi model were modeled as a combination function of temperature and water activity using the response surface and Arrhenius-Davey models for secondary model. The value of r², MSE, bias and accuracy factor suggest Baranyi model...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vibrio harveyi; Modelling; Temperature; Water activity.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000400018

Growth of Aspergillus ochraceus, A. carbonarius and A. niger on culture media at different water activities and temperatures
Provedor de dados: 58
Autores: Palacios-Cabrera,Héctor; Taniwaki,Marta Hiromi; Hashimoto,Jorge Minoru; Menezes,Hilary Castle de.
The objective of this paper was to determine the influence of three culture media with different water activities, times of incubation and temperatures on the growth of A. ochraceus, A. carbonarius and A. niger. Spores of A. ochraceus, A. carbonarius and A. niger were inoculated onto three culture media: Czapeck Yeast extract Agar (CYA), Dichloran 18% Glycerol Agar (DG18) and Malt Yeast extract 40% Glucose Agar (MY40G). The plates were incubated at five different temperatures (8, 25, 30, 35 and 41ºC). The growth of fungi was evaluated every 24h, measuring the colony diameter (mm). None of the species grew at 8ºC in any culture media. For A. carbonarius, 30ºC was the best temperature for growth while for A. niger temperatures above 30ºC were better in all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aspergillus ochraceus; Aspergillus carbonarius; Aspergillus niger; Growth measurement; Water activity; Temperature.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000100005

Evaluation of viability of Aspergillus flavus and aflatoxins degradation in irradiated samples of maize
Provedor de dados: 58
Autores: Aquino,Simone; Ferreira,Fabiane; Ribeiro,Deise Helena Baggio; Corrêa,Benedito; Greiner,Ralf; Villavicencio,Anna Lucia Casañas Haasis.
One of the currently most important fungi in stored grains is Aspergillus flavus, which produce aflatoxins. This fungus can grow on diverse substrates and represents a serious public health and animal nutritional problem. Therefore, the study of techniques that can be applied to the control of aflatoxins is of great importance. The objective of the present study was to determine the effects of gamma radiation on the growth of Aspergillus flavus Link and on degradation of aflatoxin B1 and B2 (AFB1 and AFB2) at a relative humidity of 97 99% and a water activity (Aw) of 0.88-0.94. Samples of corn grains were irradiated using a cobalt 60 source emitting gamma rays at doses of 2, 5 and 10 kGy. Irradiation was found to be effective in reducing the number...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gamma radiation; Aspergillus flavus; Fluorescent viability test; Water activity; Maize.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000400009

Study of the interactions between Penicillium oxalicum Currie &amp;amp; Thom and Alternaria alternata (Fr.) Keissler
Provedor de dados: 58
Autores: Sempere,F.; Santamarina,M.P.
The aim of this research was the analysis of the possible antagonistic effect of Penicillium oxalicum over the pathogen rice fungus A. alternata under different conditions of temperature, water activity and culture media. The macroscopic study of the dual growth revealed that according to the Index of Dominance P. oxalicum was more competitive that A. alternata at 25ºC whereas at 15ºC was this species. Microscopic analysis showed that P. oxalicum was a mycoparasite of A. alternata at all conditions tested. The antagonist penetrated into A. alternata and disintegrated its conidiophores and conidia. The results suggests that P. oxalicum may be a possible biological control agent of the rice pathogens in a future.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alternaria alternata; Penicillium oxalicum; Rice; Water activity; Mycoparasitism.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000300021

Leukoencephalomalacia in horses associated with immature corn consumption
Provedor de dados: 65
Autores: Echenique,Joanna Vargas Zillig; Estima-Silva,Pablo; Pereira,Daniela Brayer; Marques,Lucas Santos; Ribeiro,Luiza Soares; Schild,Ana Lucia.
ABSTRACT:  Horse leukoencephalomalacia (ELEM) is a disease caused by the ingestion of mycotoxins (fumonisins) produced by fungi of the genus Fusarium that infect corn and/or its byproducts. This disease has been described by ingestion of mature corn with humidity above 15% at temperatures below 20°C. The aim of this paper was to report an outbreak of leukoencephalomalacia in horses fed with immature corn. Two horses out of three showed neurological signs approximately seven days after eating immature corn in its reproductive phase (R2, milky grains). Corn was harvested and administered directly to the animals, with no storage. Deaths occurred approximately 24 hours after the onset of clinical signs. Grossly, there were multifocal dark red to brown areas in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fumonisin; Water activity; Cereals; Central nervous system; Horse.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000300551

Thermodynamic properties of moisture desorption isotherms of ryegrass (Lolium multiflorum L.) seeds
Provedor de dados: 64
Autores: Zeymer,Juliana Soares; Corrêa,Paulo Cesar; Oliveira,Gabriel Henrique Horta de; Araujo,Marcos Eduardo Viana de; Magalhães,Diana Soares.
ABSTRACT Studies about the thermodynamic properties of ryegrass seeds are necessary to improve post-harvest processes, relating the factors that affect product quality with the interaction between water and its chemical components. Given the importance of recognizing and understanding the intrinsic behavior of water in ryegrass seeds and providing data for the improvement of industrial drying equipment, this work aimed to calculate and evaluate the thermodynamic properties of moisture desorption of ryegrass seeds as a function of the equilibrium moisture content. Ryegrass seeds with initial moisture content of 10.4 (% d.b.) was used. The equilibrium moisture content of seeds was determined by static-gravimetric method at different temperatures (10, 20, 30,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gibbs free energy; Entropy; Enthalpy; Water activity; Chung Pfost.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100202