Drying of orange skin: drying kinetics modelling and functional properties

Garau, M.C.; Simal, Susana; Femenia, Antoni; Rosselló, Carmen

doi:10.1016/j.jfoodeng.2005.04.017

Cited by 95 publications

(49 citation statements)

References 33 publications

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“…However, for the leaves, the highest WHC and OHC values were obtained respectively at 850 and 180W (6.857 ± 0.406 and 2.703 ± 0.245 g/g db, respectively). According to [24], water could be held in capillary structures of the fiber as a result of surface tension strength, and also water could interact with molecular components of fiber through hydrogen bonding or dipole form. However, OHC depends on surface properties, overall charge density, thickness and hydrophobic nature of the fiber particle.…”

Section: Effect Of Microwave Treatment On Functional Propertiesmentioning

confidence: 99%

Effect of Microwave Treatment On Physical and Functional Properties of Orange (Citrus Sinensis) Peel and Leaves

Bejar¹,

Kechaou²,

Mihoubi³

2011

J Food Process Technol

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NomenclatureK, n: Page Model constants; r: Coefficient of Correlation; SE: Standard Error; P: Relative Percent Error (%); t: Time; X r: : Reduced moisture content; X 0 : Initial moisture content (kg water/kg db); X f : Final moisture content (kg water/kg db); R r : Reduced drying rate; N: Numbers of data points; n p : Numbers of parameters SubscriptsCal: Calculated; exp: Experimental; j: Samples number. Material and Methods MaterialFresh oranges (Citrus sinensis) and leaves of "Maltaise" variety were picked in Manzel Bouzalfa (Nabeul, Tunisia) in an advanced stage AbstractThe effect of microwave drying on drying characteristics of "Maltaise" peel and leaves was investigated. The effect of microwave power on color, total phenols and water and oil holding capacities was determined. By increasing microwave powers (100-850W), drying time decreased from 6960 to 420 s for peel and from 4800 to 210 s for leaves. Page model successfully described the drying kinetics. For microwave powers ranging from 100 to 850W, the values of r, SE and P are ranging respectively from 0.8636 to 0.9806, from 0.2292 to 0.4307 and from 15.0381 to 34.1190. The applied microwave powers affect significantly all color parameters of peel and leaves (P<0.001).Compared to the fresh state, functional properties of peel and leaves decreased after microwave drying except the water holding capacity of peel that increased. For both dried peel and leaves and at each applied microwave power, water holding capacity values were higher than oil holding capacity values. Microwave drying decreased total phenols of the dried leaves compared to the fresh ones. However, drying at 450W improved the extractible phenols amounts from peel (1.880 ± 0.050g caffeic acid/100g db).

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Section: Effect Of Microwave Treatment On Functional Propertiesmentioning

confidence: 99%

Effect of Microwave Treatment On Physical and Functional Properties of Orange (Citrus Sinensis) Peel and Leaves

Bejar¹,

Kechaou²,

Mihoubi³

2011

J Food Process Technol

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“…Trabalhos sobre secagem de resíduos agrícolas incluem resíduos da extração do azeite de oliva (MONTERO et al, 2010;VEGA-GALVEZ et al, 2010), sementes de abóbora (JITTANIT, 2011), resíduos de laranja (GARAU et al, 2006(GARAU et al, , 2007, bagaço de cenoura (KUMAR; SARKAR; SHARMA, 2012), resíduos de cevada maltada provenientes de indústrias de cerveja (TANG; CENKOWSKI; IZYDORCZYK, 2005), resíduos de gergelim (AL-MAHASNEH et al, 2007), sementes de uva (ROBERTS; KIDD; PADILLA-ZAKOUR, 2008), bagaço de cana de açúcar (VIJAYARAJ; SARAVANAN; RENGANARAYANAN, 2007), bagaço de coco (JENA; DAS, 2007), bagaço de maçã (WANG et al, 2007), resíduos de romã (DOYMAZ, 2012), resíduo da indústria de processamento de goiaba (KONG et al, 2010), entre outros. Apesar da grande diversidade de estudos utilizando resíduos agrícolas, não foram encontradas pesquisas abordando a secagem de grãos residuais de urucum provenientes da indústria de extração da bixina.…”

Section: Introductionunclassified

Secagem de grãos residuais de urucum por exposição direta ao sol combinada com secagem em secador acumulador de calor

et al. 2014

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ResumoO processo de extração do pigmento bixina resulta em uma grande quantidade de grãos residuais de urucum. A maior parte desse material é descartada, mas é possível aproveitá-lo incorporando-o em rações para animais e na alimentação humana. Neste trabalho, objetivou-se secar grãos residuais de urucum utilizando energia solar. Os grãos foram divididos em dois lotes, um com óleo, reproduzindo as condições dos grãos após a extração oleosa de bixina e outro lote sem óleo. As secagens foram realizadas durante o dia em base de concreto recoberta com lona de polietileno preta, com as amostras em bandejas e expostas ao sol; durante a noite metade das amostras foi posta a secar em secador acumulador de calor e a outra metade ficou em bancada de laboratório para controle. Os grãos apresentaram teores de umidade inicial e final de aproximadamente 18% b.u. e 5% b.u., respectivamente. A utilização do secador acumulador de calor no período noturno possibilitou a obtenção de amostras com razão de umidade abaixo de 0,1 na noite do primeiro dia de secagem, enquanto as amostras controle absorveram água no período noturno. Todos os modelos estudados apresentaram bom ajuste aos dados experimentais, com valores de coeficientes de determinação superiores a 0,95 e valores de desvios quadráticos médios inferiores a 0,1. Os coeficientes de difusividade foram da ordem de 10 -9 m 2 s -1 , para todos os tratamentos estudados, com as amostras de grãos sem óleo apresentando o maior valor. Palavras-chave: Bixa orellana L., secagem solar, resíduos agrícolas AbstractThe process of extraction of the pigment bixin results in a large amount of residual grain annatto. Most of this material is discarded, but you can enjoy it by incorporating it into animal feed and human food. This study aimed to dry grain residual annatto using solar energy. The beans were divided into two batches, one with oil, reproducing conditions of the grains after extraction of bixin oil, and other oilfree. The drying was performed during the day in the concrete base covered with black polythene bag with samples in trays and exposed to the sun; overnight half of the samples was placed in a dryer to dry heat accumulator and the other half was in bench laboratory for control. The grains showed levels of initial and final moisture of about 18% wb and 5% wb, respectively. Use the dryer heat accumulator at night allowed the collection of samples with the moisture ratio below 0.1 in the evening of the first day of drying, while the control samples absorbed water during the night. All models studied showed good fit to experimental data, with values of determination coefficients above 0.95 and average values of the squared deviations of less than 0.1. The diffusivity coefficients were of the order of 10 -9 m 2 s -1 for all treatments, with the grain samples without oil showing the greatest value.

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“…En función del objetivo de la modelización se pueden plantear modelos con diferentes grados de complejidad en la resolución (Mulet et al, 1989a), lo que permite evaluar el esfuerzo requerido en la modelización y realizar la selección del modelo oportuno teniendo en cuenta este factor. Según las ecuaciones planteadas se podrán utilizar métodos de resolución analíticos como el método de separación de variables (Crank, 1975), o por el contrario en algunas ocasiones hay que recurrir a métodos de resolución numéricos como el de diferencias finitas (Simal et al, 1998b;Mulet et al, 2005;Garau et al, 2006) o el de elementos finitos (Kamyar y Aguirre, 1999;Irudayaraj y Wu, 1999;Gaston et al, 2002).…”

Section: Modelización De Las Cinéticas De Secadounclassified

“…3.6.19) (Lipson y Sheth, 1973) y el error medio relativo (Ec. 3.6.20) (Nguyen et al, 2004;Garau et al, 2006).…”

Section: Determinación De La Bondad De Los Ajustesunclassified

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Contribución al estudio de la aplicación de ultrasonidos de potencia en el secado convectivo de alimentos

Pérez¹,

Vicente²

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Drying of orange skin: drying kinetics modelling and functional properties

Cited by 95 publications

References 33 publications

Effect of Microwave Treatment On Physical and Functional Properties of Orange (Citrus Sinensis) Peel and Leaves

Effect of Microwave Treatment On Physical and Functional Properties of Orange (Citrus Sinensis) Peel and Leaves

Secagem de grãos residuais de urucum por exposição direta ao sol combinada com secagem em secador acumulador de calor

Contribución al estudio de la aplicación de ultrasonidos de potencia en el secado convectivo de alimentos

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