Drying curve modelling of blanched carrot cubes under natural convection condition

Górnicki, Krzysztof; Kaleta, Agnieszka

doi:10.1016/j.jfoodeng.2007.02.002

Cited by 77 publications

(41 citation statements)

References 32 publications

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“…All the profiles show linear relationship between moisture content and drying time to reveal the constant rate of press mud drying. Similar findings were reported by Gornicki and Kaleta, [42] during drying of carrot cubes. Hassini et al [43] studied the drying kinetics of potato, and demonstrated that drying curves to exhibit a heating up, constant rate and falling rate periods.…”

Section: Drying Kineticssupporting

confidence: 91%

New Insight into Sugarcane Industry Waste Utilization (Press Mud) for Cleaner Biobutanol Production by Using C. acetobutylicum NRRL B-527

Nimbalkar

Khedkar

Gaikwad

et al. 2017

Appl Biochem Biotechnol

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In the present study, press mud a sugar industry waste was explored for biobutanol production to strengthen agricultural economy. The fermentative production of biobutanol was investigated via series of steps viz. characterization, drying, acid hydrolysis, detoxification, and fermentation. Press mud contains adequate amount of cellulose (22.3%) and hemicellulose (21.67%) on dry basis and hence it can be utilized for further acetone-butanol-ethanol (ABE) production. Drying experiments were conducted in the temperature range of 60-120 °C to circumvent microbial spoilage and enhance storability of press mud. Furthermore, acidic pretreatment variables viz. sulfuric acid concentration, solid to liquid ratio, and time were optimized using response surface methodology. The corresponding values were found to be 1.5% (v/v), 1:5 g/mL, and 15 min, respectively. In addition, the detoxification studies were also conducted using activated charcoal that removed almost 93-97% phenolics and around 98% furans, which were toxic to microorganism during fermentation. Finally, the batch fermentation of detoxified press mud slurry (sample dried at 100 °C and pretreated) using Clostridium acetobutylicum NRRL B-527 resulted in higher butanol production of 4.43 g/L with total ABE of 6.69 g/L.

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Section: Drying Kineticssupporting

confidence: 91%

New Insight into Sugarcane Industry Waste Utilization (Press Mud) for Cleaner Biobutanol Production by Using C. acetobutylicum NRRL B-527

Nimbalkar

Khedkar

Gaikwad

et al. 2017

Appl Biochem Biotechnol

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“…However, many disadvantages of hot air drying have been identifi ed, including oxygen-rich nature, which leads to quality degradation in terms of physical and nutritive qualities (Feng and Tang, 1998;Bai et al, 2002). One way to alleviate the adverse eff ect of hot air drying is a pretreatment of the product, either physically or chemically (Górnicki and Kaleta, 2007). Acid pretreatment is method which can to improve the quality of product through inactivation of enzymes and texture modifi cation.…”

mentioning

confidence: 99%

Modelling the moisture sorption isotherms of Roselle (Hibiscus sabdariffa L.) in the temperature range of 5-35 °C

Langová¹,

Jaisut²,

Thuwapanichayanan³

et al. 2013

Acta Univ. Agric. Silvic. Mendelianae Brun.

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Brunensis, 2013, LXI, No. 6, pp. 1769-1777 Water sorption tests of Roselle (Hibiscus sabdariff a L.) carried out under laboratory conditions are presented together with mathematical analyses of the moisture sorption isotherms (MSI's). Moisture equilibrium data for adsorption and desorption of water from Roselle powder were investigated at near ambient air temperatures in the range of 5 and 35 °C and water activity (Aw) ranging from 0.11 to 0.97. The manometric method has been used for water sorption tests. Models for MSI's are exponential equations. Coeffi cients of determination are 0.998 and 0.996 (for adsorption and desorption at 5 °C, respectively), 0.998 and 0.999 (for adsorption and desorption at 20 °C, respectively), and 0.998 and 0.999 (for adsorption and desorption at 35 °C, respectively). The equilibrium moisture content (EMC) of Roselle samples increased with an increase of Aw at a constant temperature both for adsorption and desorption. Adsorption curve equates to desorption curve at higher temperatures of tests carried out. Critical values of EMC of samples tested corresponding to the Aw equal to 0.6 were between 13.401% moisture content wet basis (MC w.b.) and 15.934% MC (w.b.) for moisture adsorption and desorption, respectively. These values are useful for storing conditions optimisation from point of view microorganisms grow and structural changes analyses. Crystal structure changes were observed during adsorption and desorption in the microscope, too. It was found out glass transition in dependence on the water content of samples tested.water activity, equilibrium moisture content, hysteresis, prediction, grow of microorganisms, glass transition Roselle (Hibiscus sabdariff a L.) belongs to the family Malvaceae. It originated in India and it is widely distributed in tropical and subtropical regions as a potential new food crop of considerable economic potential. Roselle is a short-day annual erect shrub and can grow to a height of 1-3 m, depending on the species. Its calyces have been suggested for the production of so drinks, Roselle tea, jam, juices, and natural food colourants (Chen et al., 2005;Chang et al., 2012). The extracts of calyces and leaves of Roselle show a signifi cant antihyperlipidemic activity (Ochani and D'Mello, 2009).Roselle calyx (Fig. 1) is usually harvested at high MC (w.b.), 85%. Therefore, drying is an important postharvest treatment prior to reduce the MC and to increase the shelf life. Moreover, the main purpose of drying the products is to minimize packaging requirements, to prolong the shelf life and to reduce shipping weights (Vengaiah and Pandey, 2007). Tab. I shows the chemical composition of Roselle calyces (Babalola et al., 2001).

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“…It also brings about substantial reduction in weight and volume, minimises packaging, storage and transportation costs (Doymaz 2007). Conventional air-drying is the most frequently used dehydration operation in food industry (Gornicki & Kaleta 2007). A critically important aspect of the drying technology is mathematical modelling of the drying processes (Demir et al 2007).…”

mentioning

confidence: 99%

Modelling the carrot thin-layer drying in a semi-industrial continuous band dryer

Aghbashlo¹,

Kianmehr²,

Arabhosseini³

et al. 2011

Czech J. Food Sci.

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Aghbashlo M., Kianmehr M.H., Arabhosseini A., Nazghelichi T. (2011): Modelling the carrot thin-layer drying in a semi-industrial continuous band dryer. Czech J. Food Sci., 29: 528-538. This paper presents a mathematical modelling of the drying process in a semi-industrial continuous band dryer. Carrot slices with the thickness of 5 mm were used for the drying experiments. The experiments were conducted at three air temperatures, 50, 60, and 70°C, three air velocities, 0.5, 1.0, and 1.5 m/s, and three chain linear velocities, 2.38 × 10 -4 , 2.78 × 10 -4 , and 3.33 × 10 -4 m/s with three replications for each treatment. The Lewis, Henderson & Pabis, and Page models were fitted to the experimental data of the moisture ratio against the sample position using nonlinear regression analysis by MATLAB computer program. The models were compared based on their coefficients of determination (r 2 ), root mean square errors (RMSE), and reduced chi-squares (χ 2 ) between the experimental and predicted moisture ratios. Consequently, the Page model was selected as the best mathematical model for describing the drying kinetics of the carrot slices. The correlations of the Page model constants k and m with the variables T, U a and U c were determined. The effective moisture diffusivity varied from 3.21 × 10 -7 to 8.98 × 10 -7 m 2 /s. The energy of activation varied from 23.02 kJ/mol to 28.1 kJ/mol using Arrhenius type equation.

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Drying curve modelling of blanched carrot cubes under natural convection condition

Cited by 77 publications

References 32 publications

New Insight into Sugarcane Industry Waste Utilization (Press Mud) for Cleaner Biobutanol Production by Using C. acetobutylicum NRRL B-527

New Insight into Sugarcane Industry Waste Utilization (Press Mud) for Cleaner Biobutanol Production by Using C. acetobutylicum NRRL B-527

Modelling the moisture sorption isotherms of Roselle (Hibiscus sabdariffa L.) in the temperature range of 5-35 °C

Modelling the carrot thin-layer drying in a semi-industrial continuous band dryer

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