DÜŞÜK VE YÜKSEK ISIL İŞLEM UYGULANMIŞ FINDIK İÇECEKLERİNİN DEPOLAMA STABİLİTELERİ

Öz

Bu çalışmada, yüksek basınç homojenizasyonu işleminden sonra düşük (LHT; 72 °C’de 20 dak) ve yüksek (HHT; 105 °C’de 1 dak)  ısıl işlem uygulanan fındık içeceklerinin sırası ile kısa (10 gün) ve uzun süreli (120 gün)  depolama süresince kalite parametrelerindeki değişimler belirlenmiştir. Isıl işlem görmüş içeceklerde canlı bakteri tespit edilmemiştir. Düşük sıcaklıkta ısıl işlem görmüş örneklerin pH ve titrasyon asitliği değerleri depolama boyunca değişmezken yüksek sıcaklıkta ısıl işlem görmüş örneklerin pH değerlerinde azalma gözlenmiştir. LHT örneklerinin protein çözünürlükleri depolama boyunca artarken HHT örneklerinde azalmıştır. LHT ve HHT fındık içeceklerinin reolojik özellikleri ve serum stabiliteleri depolama süresince değişiklik göstermiştir. Depolama boyunca LHT örneklerinde hidroperoksit indeks değeri hafifçe artarken HHT örneklerinde bu artış üç kat daha fazla olmuştur. Sonuç olarak, LHT ve HHT örneklerinde depolama boyunca farklı yapısal ve fizikokimyasal değişimler meydana geldiği gözlenmiştir. 

Anahtar Kelimeler

• Fındık içeceği,ısıl işlem,depolama stabilitesi,hidroperoksit indeks

STORAGE STABILITY OF LOW AND HIGH HEAT TREATED HAZELNUT BEVERAGES

Öz

In this study, the changes in the quality parameters of hazelnut beverages treated with low (LHT; 72°C for 20 min) and high temperature (HHT; 105°C for 1 min) after high pressure homogenization process were determined during short (10 days) and long term (120 days) storage periods, respectively. Microbial viability was not detected in any thermally treated samples. Although pH and titration acidity values of LHT samples did not show important change during the storage, the pH values of HHT samples decreased significantly. While protein solubility of LHT samples increased during storage, it slightly decreased in HHT samples. Rheological properties and also serume stability of LHT and HHT hazelnut samples changed during storage. Hydroperoxide index value slightly increased in LHT samples while it increased more than three times in HHT samples during storage. As a result, the LHT and HHT hazelnut beverages had different structural and physicochemical properties during storage.

Anahtar Kelimeler

• Hazelnut beverage,heat treatment,storage stability,hydroperoxide index

Kaynakça

1. Achouri, A., Boye, J. I., Zamani, Y. (2007). Changes in Soymilk Quality as a Function of Composition and Storage. Journal of Food Quality 30: 731-744.
2. Alasalvar, C., Shahidi, F., Liyanapathirana, C. M., Ohshima, T. (2003). Turkish Tombul Hazelnut (Corylus avellana L.). 1. Compositional Characteristics. Journal of agricultural and food chemistry 51: 3790−3796.
3. Bernat, N., Cháfer, M., Rodríguez-García, J., Chiralt, A., González-Martínez, C. (2015). Effect of high pressure homogenisation and heat treatment on physical properties and stability of almond and hazelnut milks. LWT - Food Science and Technology 62(1): 488-496.
4. Briviba, K., Graf, V., Walz, E., Guamis, B., Butz, P. (2016). Ultra high pressure homogenization of almond milk: Physico-chemical and physiological effects. Food Chem 192: 82-89.
5. Codina-Torrella, I., Guamis, B., Zamora, A., Quevedo, J. M., Trujillo, A. J. (2018). Microbiological stabilization of tiger nuts' milk beverage using ultra-high pressure homogenization. A preliminary study on microbial shelf-life extension. Food microbiology 69: 143-150.
6. Cruz, N., Capellas, M., Hernández, M., Trujillo, A. J., Guamis, B., Ferragut, V. (2007). Ultra high pressure homogenization of soymilk: Microbiological, physicochemical and microstructural characteristics. Food research international 40(6): 725-732.
7. Cserhalmi, Z., Sass-Kiss, Á., Tóth-Markus, M., Lechner, N. (2006). Study of pulsed electric field treated citrus juices. Innovative Food Science and Emerging Technologies 7(1-2): 49-54.
8. Gul, O., Atalar, I., Mortas, M., Saricaoglu, F. T., Yazıcı, F. (2018a). Application of TOPSIS methodology to determine optimum hazelnut cake concentration and high pressure homogenization condition for hazelnut milk production based on physicochemical, structural and sensory properties. Journal of Food Measurement and Characterization 12 (4): 2404-2415.

9. Gul, O., Atalar, I., Saricaoglu, F. T., Yazici, F. (2018b). Effect of multi-pass high pressure homogenization on physicochemical properties of hazelnut milk from hazelnut cake: An investigation by response surface methodology. Journal of Food Processing and Preservation 42(5): e13615.
10. Gul, O., Saricaoglu, F. T., Mortas, M., Atalar, I., Yazici, F. (2017). Effect of high pressure homogenization (HPH) on microstructure and rheological properties of hazelnut milk. Innovative Food Science & Emerging Technologies 41: 411-420.
11. Oliveira, I., Sousa, A., Morais, J. S., Ferreira, I. C., Bento, A., Estevinho, L., Pereira, J. A. (2008). Chemical composition, and antioxidant and antimicrobial activities of three hazelnut (Corylus avellana L.) cultivars. Food Chem Toxicol 46(5): 1801-1807.
12. Poliseli-Scopel, F. H., Hernández-Herrero, M., Guamis, B., Ferragut, V. (2012). Comparison of ultra high pressure homogenization and conventional thermal treatments on the microbiological, physical and chemical quality of soymilk. LWT - Food Science and Technology 46(1): 42-48.
13. Robinson, H. W., Hogden, C. G. (1940). The biuret reaction in the determination of serum proteins. 2. Measurements made by a Duboscq colorimeter compared with values obtained by the Kjeldahl procedure. Journal of Biological Chemistry 135: 727-731.
14. Rosello-Soto, E., Poojary, M. M., Barba, F. J., Koubaa, M., Lorenzo, J. M., Manes, J., Molto, J. C. (2018). Thermal and non-thermal preservation techniques of tiger nuts' beverage "horchata de chufa". Implications for food safety, nutritional and quality properties. Food Res Int 105: 945-951.
15. Shimoyamada, M., Tsushima, N., Tsuzuki, K., Asao, H., Yamachi, R. (2008). Effect of Heat Treatment on Dispersion Stability of Soymilk and Heat Denaturation of Soymilk Protein. Food Science and Technology Research 14(1): 32–38.
16. Ukwuru, M. U., Agbodo, A. C. (2011). Eeffect processing treatment on the quality of Tiger nut milk. Pakistan Journal of Nutrition 10 (1): 95-100.
17. Valencia-Flores, D. C., Hernandez-Herrero, M., Guamis, B., Ferragut, V. (2013). Comparing the effects of ultra-high-pressure homogenization and conventional thermal treatments on the microbiological, physical, and chemical quality of almond beverages. J Food Sci 78(2): E199-205.