THE EFFECT OF DIFFERENT PASTEURIZATION CONDITIONS ON THE RHEOLOGICAL, TEXTURAL AND SENSORY PROPERTIES OF WHITE CHEESE

Öz

In this study, dynamic rheological, textural, color and sensory properties of White cheeses produced from pasteurized milk at different conditions (A: 65 °C for 20 min, B: 75 °C for 5 min, and C: 85°C for 5 min) were investigated at 7, 30, 60, and 90 days of storage. The higher elastic behaviors of the cheeses C and B than A were associated with improved inter- and intramolecular interactions of casein related to the temperature and an increase in the ratio of denatured whey protein in this structure. Cheese A changed as the highest extent in viscoelastic property and complex viscosity parameter while cheese B was determined as more stable during storage. The results of hardness and adhesiveness in texture analysis confirmed that cheese B had a more resistant protein structure. The effect of different pasteurization temperatures on the color parameters was not found. The Structure-Texture as a sensory property of cheese B in the first months received higher scores while no differences among the samples in the last month were observed. As a result, White cheese with improved viscoelastic property could be produced from the milk pasteurized at 75 °C but increased temperature reduced this feature.

Anahtar Kelimeler

• White cheese
• pasteurization temperature
• rheology
• texture

FARKLI PASTÖRİZASYON KOŞULLARININ BEYAZ PEYNİRİN REOLOJİK, TEKSTÜREL VE DUYUSAL ÖZELLİKLERİNE ETKİSİ

Öz

Bu çalışmada, farklı koşullarda pastörize edilen sütten (A: 65 °C’de 20 dak, B: 75 °C’de 5 dak ve C:85 °C’de 5 dak.) üretilen Beyaz peynirlerin dinamik reolojik, tekstür, renk ve duyusal özellikleri 7., 30., 60. ve 90. günlerde araştırılmıştır. C ve B peynirlerinin, A’dan daha yüksek elastik özellikleri, sıcaklığa bağlı kazeinin molekül içi ve moleküller arası etkileşimlerinin gelişmesine ve bu yapıdaki denatüre peynir altı suyu yüzdesinin artmasına bağlanmıştır. Depolama sırasında viskoelastik özelliği ve kompleks viskozite parametresi en fazla A peynirinin değişirken, B peynirinin daha kararlı olduğu belirlenmiştir. Tekstür analizindeki sertlik ve dış yapışkanlık sonuçları da B peynirinin daha dirençli protein yapısına sahip olduğunu göstermiştir. Farklı pastörizasyon sıcaklıklarının, renk parametreleri üzerine bir etkisi bulunmamıştır. B peynirinin Yapı-Tekstür özelliği ilk aylarda daha yüksek puan alırken, son ayda örnekler arası fark görülmemiştir. Sonuç olarak, 75 °C’de pastörize edilen sütten, viskoelastik özelliği gelişmiş bir Beyaz peynir üretilebilmekledir fakat artan sıcaklık bu karakteri azaltmaktadır.

Anahtar Kelimeler

• Beyaz peynir
• Pastörizasyon Sıcaklığı
• Reoloji
• Tekstür

Kaynakça

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