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http://dx.doi.org/10.11002/kjfp.2014.21.3.334

Moisture sorption isotherms of corn powder as affected by roasting temperature  

Chung, Hun-Sik (Department of Food Science and Technology, Pusan National University)
Youn, Kwang-Sup (Department of Food Science and Technology, Catholic University of Daegu)
Publication Information
Food Science and Preservation / v.21, no.3, 2014 , pp. 334-340 More about this Journal
Abstract
The moisture sorption isotherms of corn powder prepared from corn kernels roasted for 20 min at 160, 180, 200, 220, and $240^{\circ}C$ were determined at $20^{\circ}C$ using the static gravimetric method over the range of water activities ($a_w$) of 0.11~0.90. The moisture sorption isotherms showed a typical sigmoid shape, and the equilibrium moisture content tended to increase with increasing $a_w$, and increased sharply at above 0.75 $a_w$. At above 0.53 $a_w$, the equilibrium moisture content of the roasted corn powder increased with the increase in the roasting temperature. Six mathematical models (Bradley, Caurie, Halsey, Henderson, Kuhn, and Oswin) were used to fit the experimental data. The Oswin, Caurie, Henderson, and Halsey models were found to have suitability for describing the sorption curves, and the Oswin model was the best fit model for all the roasting temperatures. Concerning the monolayer moisture content, the Guggenheim-Anderson-Boer (GAB) equation showed high significance. The monolayer moisture content increased as the roasting temperature was increased, to 0.043 and 0.053 kg $H_2O/kg$ solids in the corn powder roasted at $180^{\circ}C$ and $240^{\circ}C$, respectively. These results suggest that the roasting temperatures of the corn kernels affected the moisture sorption characteristics ($20^{\circ}C$) of the corn powder.
Keywords
corn; roasting; sorption isotherm; monolayer moisture content; water activity;
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Times Cited By KSCI : 2  (Citation Analysis)
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1 Kato H, Doi Y, Tsugita T, Kosai K, Kamiya T, Kurata T (1981) Changes in volatile flavour components of soybeans during roasting. Food Chem, 7, 87-94   DOI   ScienceOn
2 Chung HS, Chung SK, Youn KS (2011) Effects of roasting temperature and time on bulk density, soluble solids, browning index and phenolic compounds of corn kernels. J Food Process Preserv, 35, 832-839   DOI
3 Medoua GN, Mbofung CMF (2007) Kinetics studies of some physico-chemical substances during roasting and preparation of beverage made by Cassia occidentalis seeds. LWT-Food Sci Technol, 40, 730-736   DOI
4 Longvah T, Deosthale YG (1998) Effect of dehulling, cooking and roasting on the protein quality of Perilla frutescens seed. Food Chem, 63, 519-523   DOI
5 Ozdemir M, Ackurt F, Yildiz M, Biringen G, Gurcan T, Loker M (2001) Effect of roasting on some nutrients of hazelnuts (Corylus Avellena L.). Food Chem, 73, 185-190   DOI   ScienceOn
6 Kahyaoglu T (2008) Optimization of the pistachio nut roasting process using response surface methodology and gene expression programming. LWT-Food Sci Technol, 41, 26-33   DOI   ScienceOn
7 Yazdanpanah H, Mohammadi T, Abouhossain G, Cheraghali AM (2005) Effect of roasting on degradation of aflatoxins in contaminated pistachio nuts. Food Chem Toxicol, 43, 1135-1139   DOI
8 Pittia P, Rosa MD, Lerici CR (2001) Textural changes of coffee beans as affected by roasting conditions. LWT-Food Sci Technol, 34, 168-171   DOI   ScienceOn
9 Kahyaoglu T, Kaya S (2006) Modeling of moisture, color and texture changes in sesame seeds during the conventional roasting. J Food Eng, 75, 167-177   DOI   ScienceOn
10 Cammerer B, Kroh LW (2009) Shelf life of linseeds and peanuts in relation to roasting. LWT-Food Sci Technol, 42, 545-549   DOI   ScienceOn
11 Shin HK, Hwang SH, Youn KS (2003) Absorption characteristics and prediction model of ginger powder by different drying methods. Korean J Food Sci Technol, 35, 211-216   과학기술학회마을
12 Kim HK, Jo KS, Kang TS, Shin HS (1987) Browning and sorption characteristics of dried garlic flakes with relative humidity and storage temperature. Korean J Food Sci Technol, 19, 176-180   과학기술학회마을
13 Asep EK, Jinap S, Tan TJ, Russly AR, Harcharan S, Nazimah SAH (2008) The effects of particle size, fermentation and roasting of cocoa nibs on supercritical fluid extraction of cocoa butter. J Food Eng, 85, 450-458.   DOI   ScienceOn
14 Chung HS, Seong JH, Lee YG, Kim HS, Lee JB, Youn KS (2009) Browning and moisture sorption characteristics of Rubus coreanus prepared by different drying methods. Korean J Food Preserv, 16, 797-803   과학기술학회마을
15 Saravacos GD (1967) Effect of the drying method on the water sorption of dehydrated apple and potato. J Food Sci, 32, 81-84   DOI
16 Tsami E, Maroulis ZB, Morunos-Kouris D, Saravacos GD (1990) Water sorption isotherms of raisins, currants, figs, prunes and apricots. J Food Sci, 55, 1594-1597   DOI
17 Mclaughlin CP, Magee TRA (1998) The determination of sorption isotherm and the isosteric heats of sorption for potatoes. J Food Eng, 35, 267-280   DOI   ScienceOn
18 Sukumar D, Hermavathy J, Bhat KK (2002) Moisture sorption studies on onion powder. Food Chem, 78, 479-482   DOI   ScienceOn
19 Bradley RS (1936) Polymolecular adsorbed films. Part I. The adsorptionof argon on salt crystals at low temperatures and the determination of surface fields. J American Chem Soc, 77, 1467-1474
20 Caurie M (1981) Derivation of full range moisture isotherms. In: Water Activity: Influences on Food Quality, Rockland LB, Stewart GF (Editor), Academic Press, New York, USA, p 63-87
21 Kuhn IJ (1964) A new theoretical analysis of adsorption phenomena. Introductory part: The characteristics expression of the main regular types of adsorption isotherms by a single simple equation. J Colloid Sci, 19, 685-698   DOI   ScienceOn
22 Oswin CR (1946) The kinetics of package life. III. The isotherm. J Soc Chem Indus, 65, 419-421   DOI
23 Halsey G (1948) Physical adsorption in non-uniform surfaces. J Chem Physi, 16, 931-937   DOI
24 Henderson SM (1952) A basic concept of equilibrium moisture. Agric Eng, 33, 29-32
25 Brunauer S, Emmett PH, Teller E (1938) Adsorption of gases in multimolecular layers. J American Chem Soc, 60, 308-319
26 Anderson R (1946) Modifications of the BET equation. J American Chem Soc, 68, 689-691
27 Chung HS, Chung SK, Youn KS (2011) Effects of roasting temperature and time on bulk density, soluble solids, browning index and phenolic compounds of corn kernels. J Food Process Preserv, 35, 832-839   DOI
28 Schenker S, Handschin S, Frey B, Perren R, Escher F (2000) Pore structure of coffee beans affected by roasting conditions. J Food Sci, 65, 452-457   DOI   ScienceOn
29 Jha SN (2005) Mathematical simulation of roasting of grain. J Food Eng, 71, 304-310   DOI
30 Lomauro CJ, Bakshi AS, Labuza TP (1985) Evaluation of food moisture sorption isotherm equations. Part I. Fruit, vegetable and meat products. LWT-Food Sci Technol, 18, 111-117
31 Boquet R, Chirife J, Iglesia HA (1978) Equatins for fitting water sorption isotherms of foods. J Food Technol, 13, 319-329
32 Westgate P, Lee JY, Ladisch MR (1992) Modeling of equilibrium sorption of water vapor on starch materials. Trans American Soc Agric Eng, 35, 213-219   DOI