Effect of voltage gradient on ohmic thawing characteristics of sour cherry juice concentrates for the temperature range of-18celcius to+4celcius
Küçük Resim Yok
Tarih
2019
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Sage Publications Ltd
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Frozen sour cherry juice concentrates having 15%, 30%, 40% and 50% total soluble solid (TSS) contents were thawed by ohmic thawing (OT; 10 V/cm, 15 V/cm and 20 V/cm) and conventional thawing (CT; at 4 celcius). To enhance the electrode-sample contact during OT, the thawing cell was custom-designed. Thawing times were shortened about 90% by OT. Thermal images were taken to determine temperature homogeneity. As OT proceeded, a small amount of frozen sample having a relatively lower density raised up to the surface of the sample. It resulted in temperature heterogeneity in the surface due to relatively rapid temperature increment in thawed regions during OT. The change of effective electrical conductivity (EEC) in the temperature range of -18 celcius and 4 celcius was determined and it varied between 0.005 and 0.25 s/m. For the same temperature, EEC increased as TSS increased up to 40% (p<0.05). EEC-temperature relations were characterized by a polynomial model.
Açıklama
Anahtar Kelimeler
Ohmic, thawing, electrical conductivity, temperature
Kaynak
Food Science and Technology International
WoS Q Değeri
Q3
Scopus Q Değeri
Cilt
25
Sayı
8
