Physicochemical characterization of dried pumpkin using osmosis – microwave method

Document Type : Research Article

Authors

1 Graduated MSc Student, Department of Food Science and Engineering, Azadshahr Branch, Islamic Azad University, Azadshahr , Iran

2 Assistant Professor, Department of Food Science and Engineering, Azadshahr Branch, Islamic Azad University, Azadshahr , Iran

Abstract

Pumpkin is important cucurbit with very high nutritional value. In this study, the effect of osmosis - microwave combination drying of pumpkin slices with a thickness of 5 and 7 mm, sucrose osmotic solution concentrations of 45, 55 and 65% and at times of 15, 30, 45, 60, 90, 120, 150 and 180 min and power of 100, 300 and 500 watts were used as complementary drying. Physical parameters such as texture, shrinkage, color and chemical parameters such as protein, ash, moisture, β-carotene, fat, iron, calcium, sodium, potassium, phosphorus, fiber and vitamin A were studied. Osmotic treatments have reduced the resistance and firmness. The lowest amount of shrinkage was related to dried pumpkin at 100 watt power (71.09%) and significantly difference was observed between samples. The amount of β-carotene for pumpkin with thickness of 0.5 and 0.7 cm dried at a concentration of 55% was between 2.6-3.5%. According to the statistical results there was no significant difference of fiber in the dried samples at power of 100 and 300 watts, but dried samples with the power of 500 watts were significantly different. Amount of pumpkin sodium with thickness of 0.5 and 0.7 cm dried at the 100 watt in microwave oven was between 0.01-0.02%. Calcium content of pumpkin with 0.5 cm thick dried under the powers of 100, 300 and 500 watts were between 1.05-1.08%. The dried pumpkin slices with microwave with 100 watt power had lower darkness related to 300 and 500 watt. A total time of 150 minutes for the osmosis process and power of 500 w was selected for the microwave dryer.

Keywords

Main Subjects


[1] Ashwini Sopan, B., Vasantrao, D.N., Ajit, S.B. (2014) Total phenolic content and antioxidant potential of cucurbita maxima (pumpkin) powder, Int J Pharm Sci Res, 5, 1903-1907.
[2] Bhat, M.A., Bhat, A. (2013) Study on Physico-Chemical Characteristics of Pumpkin Blended Cake, J Food Proc Tech, 4, 4-9.
[3] Hosseini Ghaboos, S.H., Seyedain Ardabili, S.M., Kashaninejad, M., Asadi, G., Aalami, M. (2016) Combined infrared-vacuum drying of pumpkin slices, J Food Sci Tech, 53, 2380-2388.
[4] Ebrahim, R.M., Kashaninezhad, M., Mirzaei, H.E., Khomeiri, M. (2009) Effect of temperature, osmotic solution concentration and mass ratio on kinetics of osmotic dehydration of button mushroom (Agaricus bisporus), J Agr Sci Nat Resour, 16(1), 208-217.
[5] Germer, S.P.M., Queiroz, M.R., Aguirre, J.M., Berbari, S.A.G., Anjos, V.D. (2010) Process variables in the osmotic dehydration of sliced peaches, Food Sci Tech (Campinas), 30, 940-948.
[6] Torringa, E., Esveld, E., Scheewe, I., van den Berg, R., Bartels, P. (2001) Osmotic dehydration as a pre-treatment before combined microwave-hot-air drying of mushrooms, J Food Eng, 49, 185-191.
[7] Sereno, A., Moreira, R., Martinez, E. (2001) Mass transfer coefficients during osmotic dehydration of apple in single and combined aqueous solutions of sugar and salt, J Food Eng, 47, 43-49.
[8] Souti Khiabani, M., Sahari, M., Emam-Djomeh, Z. (2003) Improving the dehydration of dried peach by applying osmotic method, Iranian J Agr Sci, 34, 283-291.
[9] Datta, A., Ni, H. (2002) Infrared and hot-air-assisted microwave heating of foods for control of surface moisture, J Food Eng, 51, 355-364.
[10] Dı́az, G.R.z., Martı́nez-Monzó, J., Fito, P., Chiralt, A. (2003) Modelling of dehydration-rehydration of orange slices in combined microwave/air drying, Innov Food Sci Emerg Tech, 4, 203-209.
[11] Giri, S., Prasad, S. (2007) Drying kinetics and rehydration characteristics of microwave-vacuum and convective hot-air dried mushrooms, J Food Eng, 78, 512-521.
[12] Zarein, M., Samadi, S.H., Ghobadian, B. (2015) Investigation of microwave dryer effect on energy efficiency during drying of apple slices, J Saudi Soc Agr Sci, 14, 41-47.
[13] Maskan, M. (2001) Drying, shrinkage and rehydration characteristics of kiwifruits during hot air and microwave drying, J Food Eng, 48, 177-182.
[14] Maskan, M. (2001) Kinetics of colour change of kiwifruits during hot air and microwave drying, J Food Eng, 48, 169-175.
[15] Esmaiili, M., Sotudeh-Gharebagh, R., Cronin, K., Mousavi, M.A.E., Rezazadeh, G. (2007) Grape drying: a review, Food Rev. Int., 23, 257-280.
[16] Mayor, L., Moreira, R., Sereno, A. (2011) Shrinkage, density, porosity and shape changes during dehydration of pumpkin (Cucurbita pepo L.) fruits, J Food Eng, 103, 29-37.
[17] Hosseini, Z. (2006) Common Methods in Food Analysis, Shiraz University Pub.
[18] Salehi, F., Kashaninejad, M. (2014) Effect of Different Drying Methods on Rheological and Textural Properties of Balangu Seed Gum, Drying Tech, 32, 720-727.
[19] Salehi, F., Kashaninejad, M., Akbari, E., Sobhani, S.M., Asadi, F. (2016) Potential of Sponge Cake Making using Infrared–Hot Air Dried Carrot, J Texture Stud, 47, 34-39.
[20] Salehi, F., Kashaninejad, M., Asadi, F., Najafi, A. (2016) Improvement of quality attributes of sponge cake using infrared dried button mushroom, J Food Sci Tech, 1-6.
[21] Akwaowo, E.U., Ndon, B.A., Etuk, E.U. (2000) Minerals and antinutrients in fluted pumpkin (Telfairia occidentalis Hook f.), Food Chem, 70, 235-240.
[22] Lozano, J., Rotstein, E., Urbicain, M. (1983) Shrinkage, porosity and bulk density of foodstuffs at changing moisture contents, J Food Sci, 48, 1497-1502.
[23] Koç, B., Eren, İ., Kaymak Ertekin, F. (2008) Modelling bulk density, porosity and shrinkage of quince during drying: The effect of drying method, J Food Eng, 85, 340-349.
[24] Özbek, B., Dadali, G. (2007) Thin-layer drying characteristics and modelling of mint leaves undergoing microwave treatment, J Food Eng, 83, 541-549.
[25] Alibas, I. (2007) Microwave, air and combined microwave–air-drying parameters of pumpkin slices, LWT-Food Sci Tech, 40, 1445-1451.
[26] Bisharat, G.I., Katsavou, I.D., Panagiotou, N.M., Krokida, M.K., Maroulis, Z.B. (2015) Investigation of functional properties and color changes of corn extrudates enriched with broccoli or olive paste, Food Sci. Technol. Int., 21, 613-630.
[27] Krokida, M.K., Tsami, E., Maroulis, Z.B. (1998) Kinetics on color changes during drying of some fruits and vegetables, Drying Tech, 16, 667-685.
[28] Gowen, A., Abu-Ghannam, N., Frias, J., Oliveira, J. (2008) Modeling dehydration and rehydration of cooked soybeans subjected to combined microwave–hot-air drying, Innov Food Sci Emerg Tech, 9, 129-137.
[29] Sahari, M., Souti, M., Emam-Jomeh, Z. (2006) Improving the dehydration of dried peach by osmotic method, J Food Tech, 4, 189-193.
[30] Salehi, F., Abbasi Shahkoh, Z., Godarzi, M. (2015) Apricot Osmotic Drying Modeling Using Genetic Algorithm - Artificial Neural Network, J Innov Food Sci Tech, 7, 65-76.
[31] Sham, P., Scaman, C., Durance, T. (2001) Texture of vacuum microwave dehydrated apple chips as affected by calcium pretreatment, vacuum level, and apple variety, J Food Sci, 66, 1341-1347.
[32] Soysal, Y., Ayhan, Z., Eştürk, O., Arıkan, M. (2009) Intermittent microwave–convective drying of red pepper: Drying kinetics, physical (colour and texture) and sensory quality, Biosys. Eng., 103, 455-463.
[33] Nawirska, A., Figiel, A., Kucharska, A.Z., Sokół-Łętowska, A., Biesiada, A. (2009) Drying kinetics and quality parameters of pumpkin slices dehydrated using different methods, J Food Eng, 94, 14-20.
[34] Kiranoudis, C., Tsami, E., Maroulis, Z. (1997) Microwave vacuum drying kinetics of some fruits, Drying Tech, 15, 2421-2440.
[35] Arslan, D., Özcan, M.M. (2008) Evaluation of drying methods with respect to drying kinetics, mineral content and colour characteristics of rosemary leaves, Energy Convers. Manage., 49, 1258-1264.
[36] Ostadzadeh, H., Sayyed-Alangi, S.Z. (2016) Effects of drying process on qualitative and quantitative properties of watercress (Nasturtium officinale) leaves, New Tech Food, 4, 1-16.