Convective and microwave drying of onion slices regarding texture attributesüfer Ö., Demir H., Sezer S. (2018): Convective and microwave drying of onion slices regarding texture attributes. Czech J. Food Sci., 36: 187-193.
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The textural characteristics of onion slices (Allium cepa L.) of 3- and 7-mm thicknesses undergoing convective drying (50, 60, and 70°C) and microwave drying (68, 204, and 340 W real effective power levels) techniques with or without pre-treatment were evaluated. Pre-treatment consisted of dipping into brine solution (8% NaCl). Texture profile analysis at 25% compression was applied and hardness, chewiness, springiness and gumminess values of onions were recorded. As the temperature (convective) or real effective power level (microwave) increased, the hardness and chewiness levels of dried onion slices were enhanced. The values of these parameters were higher in response to microwave application compared to convective drying. Pre-treatment had an additive effect on hardness and chewiness in convectively dried samples. Maximum springiness was observed in response to convective drying. Dipping in brine solution generally caused no significant changes among slices of the same thickness (P < 0.05). With respect to gumminess, the results were quite similar to those for hardness and chewiness, i.e., markedly higher in microwave-dried onions.

Akgun Nalan A., Doymaz Ibrahim (2005): Modelling of olive cake thin-layer drying process. Journal of Food Engineering, 68, 455-461
Al-Hinai Karima Zahir, Guizani Nejib, Singh Vandita, Rahman Mohammad Shafiur, Al-Subhi Lyutha (2013): Instrumental Texture Profile Analysis of Date-Tamarind Fruit Leather with Different Types of Hydrocolloids. Food Science and Technology Research, 19, 531-538
Aktas T., Ulger P., Daglioglu F., Hasturk F. (2013): Changes of Nutritional and Physical Quality Characteristics during Storage of Osmotic Pretreated Apple before Hot Air Drying and Sensory Evaluation. Journal of Food Quality, 36, 411-425
Andrés-Bello A., Barreto-Palacios V., García-Segovia P., Mir-Bel J., Martínez-Monzó J. (2013): Effect of pH on Color and Texture of Food Products. Food Engineering Reviews, 5, 158-170
Chong Chien Hwa, Law Chung Lim, Cloke Michael, Abdullah Luqman Chuah, Daud Wan Ramli Wan (2008): Drying Kinetics, Texture, Color, and Determination of Effective Diffusivities During Sun Drying of Chempedak. Drying Technology, 26, 1286-1293
Goksel Meryem, Dogan Mahmut, Toker Omer Said, Ozgen Seda, Sarioglu Kemal, Oral Rasim Alper (2013): The Effect of Starch Concentration and Temperature on Grape Molasses: Rheological and Textural Properties. Food and Bioprocess Technology, 6, 259-271
Hosseinpour Soleiman, Rafiee Shahin, Aghbashlo Mortaza, Mohtasebi Seyed Saeid (2014): A novel image processing approach for in-line monitoring of visual texture during shrimp drying. Journal of Food Engineering, 143, 154-166
Jaworska Grażyna, Bernaś Emilia (2010): Effects of pre-treatment, freezing and frozen storage on the texture of Boletus edulis (Bull: Fr.) mushrooms. International Journal of Refrigeration, 33, 877-885
Kotwaliwale Nachiket, Bakane Pramod, Verma Ajay (2007): Changes in textural and optical properties of oyster mushroom during hot air drying. Journal of Food Engineering, 78, 1207-1211
Lanzotti Virginia (2006): The analysis of onion and garlic. Journal of Chromatography A, 1112, 3-22
Latapi G., Barrett D.M. (2006): Influence of pre-drying treatments on quality and safety of sun-dried tomatoes. Part I: Use of steam blanching, boiling brine blanching, and dips in salt or sodium metabisulfite. Journal of Food Science, 71: S24–S31.
Mitra Jayeeta, Shrivastava S. L., Rao P. S. (2012): Onion dehydration: a review. Journal of Food Science and Technology, 49, 267-277
Nagalakshmi S. Avanthika, Mitra Pranabendu, Meda Venkatesh (2014): Color, Mechanical, and Microstructural Properties of Vacuum Assisted Microwave Dried Saskatoon Berries. International Journal of Food Properties, 17, 2142-2156
Ramos I. N., Brandão T. R.S., Silva C. L.M. (2016): Structural Changes During Air Drying of Fruits and Vegetables. Food Science and Technology International, 9, 201-206
Sharma Kavita, Assefa Awraris D., Ko Eun Young, Lee Eul Tai, Park Se Won (2015): Quantitative analysis of flavonoids, sugars, phenylalanine and tryptophan in onion scales during storage under ambient conditions. Journal of Food Science and Technology, 52, 2157-2165
Sorour H., El-Mesery H. (2014): Effect of microwave and infrared radiation on drying of onion slices. International Journal of Natural and Social Sciences, 2: 119–130.
Süfer Özge, Sezer Seda, Demir Hande (2017): Thin layer mathematical modeling of convective, vacuum and microwave drying of intact and brined onion slices. Journal of Food Processing and Preservation, 41, e13239-
Szychowski Przemysław J., Frutos María José, Burló Francisco, Pérez-López Antonio J., Carbonell-Barrachina Ángel A., Hernández Francisca (2015): Instrumental and sensory texture attributes of pomegranate arils and seeds as affected by cultivar. LWT - Food Science and Technology, 60, 656-663
Tabtiang S., Prachayawarakon S., Soponronnarit S. (2012): Effects of Osmotic Treatment and Superheated Steam Puffing Temperature on Drying Characteristics and Texture Properties of Banana Slices. Drying Technology, 30, 20-28
ZHANG Shi-lin, DENG Peng, XU Yu-chao, LÜ Shan-wu, WANG Jian-jun (2016): Quantification and analysis of anthocyanin and flavonoids compositions, and antioxidant activities in onions with three different colors. Journal of Integrative Agriculture, 15, 2175-2181
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