Drying Kinetics of Biofilms Obtained from Chestnut Starch and Carrageenan with and without Glycerol

Moreira, Ramón; Chenlo, F.; Torres, M.D.; Silva, C.; Prieto, Diego Martiñá; Sousa, Ana; Hilliou, L.; Gonçalves, M. P.

doi:10.1080/07373937.2011.563000

Cited by 37 publications

(28 citation statements)

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“…Tari and Pekcan (2008) reported that the drying time of carrageenan was about 5 h at 50°C with shrinkage value ranging from 70 % to 80 % of their initial volume. (Moreira et al 2011) found that the drying time for bio films made of starch and carrageenan could be speeded up by using high air flow rates and drying time was reduced to 2-3 h at medium temperature drying ranging 30-50°C. However, this method is not yet applied for pure carrageenan.…”

Section: Introductionmentioning

confidence: 99%

Application of foam-mat drying with egg white for carrageenan: drying rate and product quality aspects

et al. 2013

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Drying is a significant step in the production of carrageenan. However, current drying process still deals with too long drying time and carrageenan quality degradation. The foam mat drying is an option to speed up drying process as well as retaining carrageenan quality. In this case, the carrageenan was mixed with egg white (albumin) as foaming agent and methyl cellulose for foam stabilizer. The foam will break the carrageenan gels and creates the porous structure resulting higher surface area for water transfer. This research studied the effect of egg white and methyl cellulose on carrageenan drying at various air temperature, and thickness. As a response, the water content versus time was observed and the drying rate was estimated. Meanwhile, the carrageenan texture was verified by X-RD (X-Ray Diffraction) and TEM (Transmission Electron Microscopy). Results showed that the presence of egg white stablized by methyl cellulose can speed up drying rate as well as retaining the crystalline structure of carrageenan. The higher albumin content, the faster drying rate. However, the addition of albumin and methyl cellulose restricted not more than 30 % in the mixture for keeping carrageenan quality and purity. By adding egg white 20 % and methyl cellulose 10 %, the water diffusion and drying rate can be two fold compared with carrageenan drying without foam. The improvement can be higher at the higher temperature and thinner carrageenan sheets.

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Section: Introductionmentioning

confidence: 99%

Application of foam-mat drying with egg white for carrageenan: drying rate and product quality aspects

et al. 2013

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“…2014 DOI: 10.1590/S0100-204X2014000200008 na superfície. Esse comportamento foi relatado por outros autores para filmes de biopolímeros com glicerol (Daud & Armstrong, 1988;Moreira et al, 2011;Reis et al, 2013). Nas curvas realizadas a 70ºC, também foram observados os períodos à taxa constante e à taxa decrescente (Figura 2 D).…”

Section: Resultsunclassified

“…O tempo total de secagem foi 2,3 vezes maior, a 40ºC (115 min), do que a 70ºC (65 min). Moreira et al (2011), Tápia-Blácido et al (2013) e Reis et al (2013) relataram resultados semelhantes. O período de secagem à taxa constante representou, aproximadamente, metade do tempo total de secagem.…”

Section: Resultsunclassified

“…O aumento da temperatura aumenta a pressão de vapor, o que pode levar à formação de bolhas, que prejudicam consideravelmente a qualidade do filme (Czaputa et al, 2011). Embora a maioria dos estudos relate a secagem da suspensão à temperatura ambiente ou em estufas com circulação forçada de ar com temperaturas moderadas, há trabalhos recentes que têm mostrado que é possível reduzir esse tempo de secagem (Moreira et al, 2011;Reis et al, 2013;Moraes et al, 2013). Tápia-Blácido et al (2013) elaboraram filmes por "casting" e secaram as suspensões de amido-glicerol e amido-sorbitol, por convecção, a diferentes temperaturas, 25,9 a 54,1ºC, e umidade relativa (UR) de 33,8 a 76,2%.…”

Section: Introductionunclassified

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Espalhamento e secagem de filme de amido-glicerol-fibra preparado por "tape-casting"

Moraes

Reszka

Laurindo

2014

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar processos de espalhamento e secagem de filme de amido-glicerol-fibras de celulose, preparado por "tape-casting". O espalhamento da suspensão foi avaliado a 50, 150 e 250 cm min -1 , seguido de secagem em estufa com circulação forçada de ar, a 40 ou 70ºC; avaliou-se também o espalhamento da suspensão a 150 cm min -1 , seguido da secagem do filme sobre suporte de "tape-casting" a 22o C e 60% de umidade relativa, com velocidades do ar de 4, 6 e 8 m s -1 no túnel de secagem. Ensaios reológicos mostraram que o espalhamento das suspensões a temperaturas inferiores a 50ºC apresentou módulo de elasticidade superior ao módulo viscoso, em todo o espectro de frequências de oscilação. As microscopias mostraram filmes secos a 40 e 70ºC sem defeitos de formação, e cujas propriedades mecânicas não diferiam. A velocidade de espalhamento e a do ar não modificam o tempo de secagem nem as propriedades dos filmes. O tempo de secagem pode ser reduzido para aproximadamente duas horas, o que é importante para a produção dos filmes em larga escala.Termos para indexação: biopolímero, curva de secagem, escala de produção, filmes biodegradáveis, filmes de amido, propriedades mecânicas. Spreading and drying of starch-glycerol-fiber film produced by tape-castingAbstract -The objective of this work was to evaluate spreading and drying processes of starch-glycerol-cellulose fiber film prepared by tape-casting. Suspension spreading was evaluated at 50, 150 and 250 cm min -1 , followed by drying in a forced-air oven at 40 or at 70ºC; suspension spreading was also evaluated at 150 cm min , followed by film drying on the tape-casting support at 22 o C and 60% relative humidity, at air-drying velocity of 4, 6, and 8 m s -1 in the drying tunnel. Rheological tests showed that suspension spreading at temperatures below 50°C had the modulus of elasticity superior to the modulus of viscosity, in all oscillation frequency spectrum. Micrographs showed films dried at 40 and 70ºC without defects and whose mechanical properties showed no differences. Spreading speed and air-drying velocities did not change the drying time and film properties. The drying time can be reduced to approximately two hours, which is important to the scale-up of film production.

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“…Experimental water sorption isotherms are based on the determination of three properties: equilibrium moisture content, water activity and temperature (commonly at atmospheric pressure) [7]. In the literature, there are a large number of available empirical and semi-empirical equations to establish mathematical relationships among these three variables, which are usually evaluated by the experimental data fitting [8]. Another possibility is the prediction of water activity, at each moisture content and temperature, from fundamental laws and empirical expressions using prediction algorithms based on chemical composition of foodstuff [9,10].…”

Section: Introductionmentioning

confidence: 99%

Statistical Criteria for Modelling of Water Desorption Isotherms of Sugars. Estimation of Sucrose Hygroscopic Properties from Glucose and Fructose Data

Moreira¹,

Chenlo²,

María³

et al. 2017

AFSE

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Abstract. Experimental water desorption isotherms of glucose, fructose and sucrose were determined at different temperatures (20, 35, 50, and 65ºC) using a static gravimetric method. Saturated salt solutions were selected to obtain different water activities from 0.09 to 0.91. All tested isotherms were type III following Brunauer's classification. The experimental data were satisfactory fitted by Henderson and Iglesias and Chirife models. A complete statistical analysis was performed, determining that Henderson model was more suitable to fit the desorption isotherms of tested sugars, since it satisfied all the rejection criteria and showed, in all studied cases, the highest values of lumped measure for the goodness of fit. Predicted water desorption isotherms of sucrose from the experimental sorption isotherms of its individual monomers (glucose and fructose), in moles of water per mol oxygen, nicely matched with those obtained experimentally.

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Drying Kinetics of Biofilms Obtained from Chestnut Starch and Carrageenan with and without Glycerol

Cited by 37 publications

References 27 publications

Application of foam-mat drying with egg white for carrageenan: drying rate and product quality aspects

Application of foam-mat drying with egg white for carrageenan: drying rate and product quality aspects

Espalhamento e secagem de filme de amido-glicerol-fibra preparado por "tape-casting"

Statistical Criteria for Modelling of Water Desorption Isotherms of Sugars. Estimation of Sucrose Hygroscopic Properties from Glucose and Fructose Data

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