Persimmon ( Diospyros kaki L.) [chapter]

A.B. Woolf, R. Ben-Arie
2011 Postharvest Biology and Technology of Tropical and Subtropical Fruits  
Özet Bu çal›flmada, Kahramanmarafl'ta yetiflen Trabzon hurmas›n›n kuruma davran›fl› deneysel olarak incelenmifltir. Deneyler üç farkl› h›z (0.5, 1.0 ve 1.5 m/s) ve üç farkl› s›cakl›kta (40, 50 ve 60 °C) konvektif bir kurutucuda yap›lm›flt›r. Elde edilen kuruma e¤rileri, literatürde kullan›lan üç farkl› ince tabakal› kurutma modeline yerlefltirilmifltir (Lewis, Henderson-Pabis ve iki terimli eksponansiyel). Hurman›n kuruma karakteristi¤ini tan›mlamada iki-terimli eksponansiyel ve Henderson-Pabis
more » ... modellerinin uygun oldu¤u belirlenmifltir. Difüzyon D eff ve kütle tafl›n›m h m katsay›lar›n›n kurutma havas› s›cakl›¤›yla de¤iflimleri belirlenmifl ve artan s›cakl›kla bu katsay›lar›nda artt›¤› tespit edilmifltir. Ayr›ca kurutma havas› s›cakl›¤›n›n hurman›n renk de¤iflimi, su aktivitesi ve protein de¤iflimine olan etkisi de belirlenmifltir. Anahtar kelimeler: Trabzon hurmas›, kuruma kineti¤i, kurutma modelleri, difüzyon katsay›s›, kütle tafl›n›m katsay›s›, renk analizi. Abstract In this study, drying behavior of Trabzon persimmon (Diospyros kaki L.) which grown in Kahramanmaras has been investigated as experimentally. Experiments have been made in a convective dryer at three different drying air velocity (U=0.5 m/s, 1.0 m/s and 1.5 m/s) and at three different drying air temperatures (40, 50, and 60 °C). The experimental moisture data were fitted to some thin layer models (namely Henderson-Pabis, Lewis and two-term exponential models) available in the literature. The two-term exponential and Henderson -Pabis models were found to describe the drying characteristics of persimmon better. The variations of diffusion D eff and mass transfer coefficients h m with the drying air velocity and drying air temperature have been determined and these coefficients were increased with increasing velocity and temperature. Also, effect of the drying air temperature on change of color, water activity and protein of persimmon was determined.
doi:10.1533/9780857092618.166 fatcat:3uahmwwvtrh2jih5c6upyewlfu