Effect of supplementary irrigation on total antioxidant capacity and phenolic content of hazelnut
Abstract
Aim of
this study was to investigate the effect of supplementary irrigation on the
total antioxidative capacity and total phenolic content of hazelnuts. Orchard
of hazelnut trees were irrigated at the different growth stages combinations.
To determine antioxidative capacity, the samples were analyzed by the
spectrophotometric assay using the stable DPPH radical. The total phenolic
content was determined by the Folin-Ciocalteu assay. The results indicated that
the total antioxidative capacity was affected by the irrigation conditions. The
hazelnut kernels and defatted hazelnut kernels from irrigated at all growth
stages showed the highest antioxidative capacity, while the lowest
antioxidative activity was observed in control (no irrigation applied). On the
contrary, the hazelnut kernel oil obtained from control induced higher
antioxidative capacity than irrigated at the first growth stage. These
spectrophotometrically measurements confirm that hazelnut kernels and their
oils contain antioxidative components having different structural properties
such as lipophilic and hydrophilic character and amounts of these compounds
were changed by irrigation conditions. In contrast, any notable change of total
phenolic content was observed in hazelnut samples, depending on the irrigation
condition.
Keywords
Hazelnut,Irrigation,growth stages,antioxidative capacity,phenolic content
References
- Alasalvar, C., Amaral, J. S., Shahidi, F., 2006. Functional Lipid Characteristics of Turkish Tombul Hazelnut (Corylus avellana L.). Journal of Agricultural and Food Chemistry, 54, 10177-10183.
- Alasalvar, C., and Shahidi, F., 2009. Tree Nuts: Composition Phytochemicals and Health Effects. Taylor & Francis Group Boca Raton London New York: CRC Press.
- Altun, M., Çelik, S. E, Güçlü, K., Özyürek, M., Erçağ, E., Apak, R., 2013. Total Antioxidant Capacity and Phenolic Contents of Turkish Hazelnut (Corylus avellana.) Kernels and Oils. Journal of Food Biochemistry, 37(1): 53-61.
- Amaral, J. S., Casal, S., Citov´a, I., Santos, A., Seabra, R. M., Oliveira, B. P. P., 2006.Characterization of several hazelnut (Corylus avellana L.) cultivars based in chemical, fatty acid and sterol composition. European Food Research and Technology, 222, 274-280.
- Arcan, I. and Yemenicioğlu, A., 2009. Antioxidant activity and phenolic content of fresh and dry nuts with or without the seed coat. Journal of Food Composition and Analysis, 22(3): 184-188.
- Crews, C., Hough, P., Godward, J., Brereton, P., Lees, M., Guiet, S., and Winkelmann, W., 2005. Study of the Main Constituents of Some Authentic Hazelnut Oils. Journal Agricultural Food Chemistry, 53(12), 4843–4852.
- Cristofori, V., Muleo, R., Bignami, C. and Rugini, E., 2014. Long term evaluatıon of hazelnut response to drip irrigation. Acta Horticulturae, 1052, 179-185.
- Contini, M., Baccelloni S., Massantini, R. and Anelli, G., 2008. Extraction of natural antioxidants from hazelnut (Corylus avellana L.) shell and skin wastes by long maceration at room temperature. Food Chemistry, 110(3): 659-669.
- Delgado, T., Malheiro, R., Pereira, J. A., Ramalhosa E., 2010. Hazelnut (Corylus avellana L.) kernels as a source of antioxidants and their potential in relation to other nuts. Industrial Crops and Products, 32(3): 621-626.
- FAO, 2019. FAOSTAT. (Web page:http://www.fao.org/faostat/en/#data/QC.), (Date accessed:17.04.2019) İslam, A .,2018. Hazelnut culture in Turkey. Akademik Ziraat Dergisi , 7 (2) , 259-266 .