Influence of Pretreatments on Quality Parameters and Nutritional Compounds of Dried Galega Kale (Brassica oleracea L. var. acephala)
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The objective of this work was to evaluate the effect of six pretreatments on quality and nutritional contents of sliced Galega kale submitted to convective drying. Among all treatments, steam blanching was the most favourable, allowing improvements in retention of vitamin C, total antioxidant capacity and chlorophylls in comparison to the absence of pretreatment. Total phenolic losses were not reduced by steam blanching, but the retention was improved by combining this approach with a previous immersion in a metabisulphite solution. Moreover, steam blanching improved the colour parameters and appearance, providing a final dried product more similar to the fresh sample.
KeywordsGalega kale Drying Pretreatments Nutrients Quality
Sara M. Oliveira, Inês N. Ramos and Teresa R. S. Brandão gratefully acknowledge Fundação para a Ciência e a Tecnologia (FCT) and Fundo Social Europeu (FSE) for the financial support through the post-doctoral grants SFRH/BPD/74815/2010, SFRH/BPD/75430/2010 and SFRH/BPD/101179/2014, respectively. This work was supported by National Funds from FCT through project PEst-OE/EQB/LA0016/2013.
- Aydin, E., & Gocmen, D. (2015). The influences of drying method and metabisulfite pre-treatment on the color, functional properties and phenolic acids contents and bioaccessibility of pumpkin flour. LWT - Food Science and Technology, 60, 385–392. doi: 10.1016/j.lwt.2014.08.025.CrossRefGoogle Scholar
- Di Scala, K., Vega-Gálvez, A., Uribe, E., Oyanadel, R., Miranda, M., Vergara, J., Quispe, I., & Lemus-Mondaca, R. (2011). Changes of quality characteristics of pepino fruit (Solanum muricatum Ait) during convective drying. International Journal of Food Science & Technology, 46(4), 746–753. doi: 10.1111/j.1365-2621.2011.02555.x.CrossRefGoogle Scholar
- Ihns, R., Diamante, L. M., Savage, G. P., & Vanhanen, L. (2011). Effect of temperature on the drying characteristics, colour, antioxidant and beta-carotene contents of two apricot varieties. International Journal of Food Science & Technology, 46(2), 275–283. doi: 10.1111/j.1365-2621.2010.02506.x.CrossRefGoogle Scholar
- Jayes, W. (2014). http://www.sugartech.co.za/psychro.
- Kopeć, A., Cieslik, E., Leszczynska, T., Filipiak-Florkiewicz, A., Wielgos, B., Piatkowska, E., Bodzich, A., & Grzych-Tuleja, E. (2013). Assessment of polyphenols, beta-carotene, and vitamin C intake with daily diets by primary school children. Ecology of Food and Nutrition, 52, 21–33. doi: 10.1080/03670244.2012.705766.CrossRefGoogle Scholar
- Nindo, C. I., Sun, T., Wang, S. W., Tang, J., & Powers, J. R. (2003). Evaluation of drying technologies for retention of physical quality and antioxidants in asparagus (Asparagus officinalis, L.). LWT - Food Science and Technology, 36, 507–516. doi: 10.1016/S0023-6438(03)00046-X.CrossRefGoogle Scholar
- Oliveira, S. M., Brandão, T. R. S., & Silva, C. L. M. (2015). Influence of drying processes and pretreatments on nutritional and bioactive characteristics of dried vegetables: a review. Food Engineering Reviews, Available online. doi: 10.1007/s12393-015-9124-0.
- Serratosa, M. P., Marquez, A., Lopez-toledano, A., Medina, M., & Merida, J. (2011). Differences in browning index and CIELAB coordinates of the two grape drying processes, traditional sun-drying and chamber-drying and during the ageing of Pedro Ximenez sweet wine. Journal of Life Sciences, 5, 974–980.Google Scholar
- Singleton, V. L., & Rossi, J. (1965). Colorimetry of total phenolics with phosphomolybdic-phosphotungstic acid reagents. American Journal of Enology and Viticulture, 16, 144–158.Google Scholar
- Vega-Gálvez, A., Di Scala, K., Rodríguez, K., Lemus-Mondaca, R., Miranda, M., López, J., & Perez-Won, M. (2009). Effect of air-drying temperature on physico-chemical properties, antioxidant capacity, colour and total phenolic content of red pepper (Capsicum annuum, L. var. Hungarian). Food Chemistry, 117(4), 647–653. doi: 10.1016/j.foodchem.2009.04.066.CrossRefGoogle Scholar