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Assessment of physical and physicochemical quality of main chocolates traded in Peru Acta Agron. (Palmira)
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: Journal 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
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Brazil nut sorting for aflatoxin prevention: a comparison between automatic and manual shelling methods Ciênc. Tecnol. Aliment.
Pacheco,Ariane Mendonça; Martins,Maristela.
The impact of automatic and manual shelling methods during manual/visual sorting of different batches of Brazil nuts from the 2010 and 2011 harvests was evaluated in order to investigate aflatoxin prevention.The samples were tested as follows: in-shell, shell, shelled, and pieces in order to evaluate the moisture content (mc), water activity (Aw), and total aflatoxin (LOD = 0.3 µg/kg and LOQ 0.85 µg/kg) at the Brazil nut processing plant. The results of aflatoxins obtained for the manually shelled nut samples ranged from 3.0 to 60.3 µg/g and from 2.0 to 31.0 µg/g for the automatically shelled samples. All samples showed levels of mc below the limit of 15%; on the other hand, shelled samples from both harvests showed levels of Aw above the limit. There were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bertholletia; Water activity; Moisture.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612013000200023
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Chemical basis for beef charqui meat texture BABT
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<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
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Comparacao de modelos matematicos para descricao das curvas de dessorcao de sementes de milho-doce. Repositório Alice
ARAUJO, E.F.; CORREA, P.C.; SILVA, R.F. da.
Este trabalho teve como objetivo determinar as curvas de dessorção das sementes de milho-doce (Zea mays L.), cultivares Superdoce e Doce Cristal, e ajustar diferentes modelos matemáticos aos dados obtidos. As sementes das duas cultivares foram submetidas à dessorção em diversos níveis de temperatura (30, 40, 50 e 60oC), combinados com diferentes umidades relativas do ar (30, 40, 50 e 60%), até atingirem a umidade de equilíbrio. Os seguintes modelos matemáticos foram ajustados por análise de regressão: Henderson-Thompson, Chung-Pfost, Copace, Sigma-Copace, Sabbah e Smith. As sementes das duas cultivares apresentaram umidades de equilíbrio higroscópico semelhantes. Os valores da variância explicada e do desvio-padrão, bem como a distribuição dos resíduos,...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Zea mays; Atividade da agua; Teor de umidade; Higroscopicidade; Water activity; Moisture content; Hygroscopicity.
Ano: 2001 URL: http://www.alice.cnptia.embrapa.br/handle/doc/103928
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Correlation between water activity and moisture content of Turkish flower and pine honeys Ciênc. Tecnol. Aliment.
SERİN,Seher; TURHAN,Kamile Nazan; TURHAN,Mahir.
Abstract Water activity (aw) and moisture content (MC) of Turkish liquid flower and pine honeys were determined. Samples (706 flower and 257 pine) were collected during the honey harvesting seasons of 2010-2014 from 137 apiaries in locations with different climatic conditions all over the land. Up to date, this work is the first one seeking for a correlation between aw and MC for Turkish honeys, and also it is the largest and longest one among similar works to the best of the researchers’ knowledge. The ranges of aw and MC values of the Turkish honeys were in agreement with the literature. aw was determined between 0.470 and 0.563 for the flower honeys, and between 0.492 and 0.589 for the pine honeys. MC was measured between 15.0 and 20.4% (m/m) for the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Water activity; Moisture content; Flower honey; Pine honey; Turkey.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612018000200238
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Design, development and performance of solar dryer for pineapple (Ananas comosus (L.) Merr.), mamey (Mammea americana L.) and banana (Musaparadisiaca L.) fruit drying Acta Agron. (Palmira)
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: Journal 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
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Determination of desorption isotherms, latent heat and isosteric heat of pequi diaspore AGRIAMBI
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
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Effect of combined function of temperature and water activity on the growth of Vibrio harveyi BJM
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
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Effect of drying method on the adsorption isotherms and isosteric heat of passion fruit pulp powder Ciênc. Tecnol. Aliment.
Pedro,Maria Angélica Marques; Telis-Romero,Javier; Telis,Vânia Regina Nicoletti.
The sorption behavior of dry products is generally affected by the drying method. The sorption isotherms are useful to determine and compare thermodynamic properties of passion fruit pulp powder processed by different drying methods. The objective of this study is to analyze the effects of different drying methods on the sorption properties of passion fruit pulp powder. Passion fruit pulp powder was dehydrated using different dryers: vacuum, spray dryer, vibro-fluidized, and freeze dryer. The moisture equilibrium data of Passion Fruit Pulp (PFP) powders with 55% of maltodextrin (MD) were determined at 20, 30, 40 and 50 ºC. The behavior of the curves was type III, according to Brunauer's classification, and the GAB model was fitted to the experimental...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Water activity; Maltodextrin; Freeze drying; Spray drying; Vaccum drying; Vibrofluidized bed.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612010000400024
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Effect of methyl branching of C8H18 alkanes and water activity on lipase-catalyzed enantioselective esterification of ibuprofen Electron. J. Biotechnol.
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
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Effect of moisture content and inoculum on the growth and conidia production by Beauveria bassiana on wheat bran BABT
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 < 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
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Effect of Sodium Chloride Replacement with Potassium Chloride on Quality Traits of Bicarbonate-Marinated Turkey Breast Meat Rev. Bras. Ciênc. Avic.
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
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Evaluation of viability of Aspergillus flavus and aflatoxins degradation in irradiated samples of maize BJM
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
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Growth of Aspergillus ochraceus, A. carbonarius and A. niger on culture media at different water activities and temperatures BJM
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
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Growth of Byssochlamys nivea in pineapple juice under the effect of water activity and ascospore age BJM
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
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Hygroscopicity of ‘sucupira-branca’ (Pterodon emarginatus Vogel) fruits AGRIAMBI
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
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Isotherms and isostatic heat of foam-mat dried yellow mombin pulp AGRIAMBI
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
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Leukoencephalomalacia in horses associated with immature corn consumption Ciência Rural
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
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Mathematical modeling of the drying of orange bagasse associating the convective method and infrared radiation AGRIAMBI
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
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Moisture adsorption characteristics of ginger slices Ciênc. Tecnol. Aliment.
Alakali,Joseph; Irtwange,Simon Verlumun; Satimehin,Adesola.
The moisture adsorption characteristics of dried ginger slices was studied to determine the effect of storage conditions on moisture adsorption for the purpose of shelf life prediction, selection of appropriate packaging materials, evaluate the goodness-of-fit of sorption models, and determine the thermodynamics of moisture adsorption for application in drying. There was a highly significant effect (p < 0.05) of water activity (a w), temperature, and pre-treatment on the equilibrium moisture content (EMC) of the dried ginger slices. At constant a w, the EMC decreased as temperature increased. The EMC of all samples increased as the a w increased at constant temperature. The sorbed moisture of the unpeeled ginger slices was higher than the peeled while...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sorption models; Thermodynamics; Water activity; Ginger slices.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612009000100024
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