Dondurarak Kurutma Yönteminin Zencefilin Kurutma Karakteristikleri, Renk, Mikroyapı ve Rehidrasyon Özellikleri Üzerine Etkisi

Yıl 2016, Cilt: 33 Sayı: Ek Sayı, 126 - 136, 31.08.2016

Nazmi İzli Ahmet Polat

Öz

Bu çalışmada, zencefil örneklerinin kurutma karakteristikleri, renk, mikroyapı ve rehidrasyon özellikleri üzerine dondurarak kurutma yönteminin etkisi incelenmiştir. Deneysel sonuçlar kuruma hızının hem artan kuruma zamanıyla hem de örneklerin nem içeriklerinin düşmesiyle azaldığını göstermiştir. Kurutma işlemlerinde en iyi ince tabaka kurutma modelini seçmek için 10 matematiksel model deneysel verilere uygulanmıştır. İstatistiksel parametreler esas alındığında, en düşük ki-kare (χ2) ve hataların karelerinin karekök ortalaması (RMSE) değerlerinin yanı sıra en yüksek belirtme katsayısı (R2) değerine sahip Page modeli zencefil örneklerinin kuruma davranışları tanımlanması için en iyi model olarak bulunmuştur. Taze zencefilin tüm renk parametreleri dondurarak kurutma uygulaması ile etkilenmiştir. Kurutulan örnekler kararmamış, sarılık (b*), Kroma (C) ve Hue açısı () parametreleri azalırken, parlaklık (L*) ve yeşillik (-a*) değerleri artmıştır. Taze ve kurutulmuş zencefillerin mikroyapı değişimleri sırasıyla ışık mikroskobu ve taramalı elektron mikroskobuyla incelenmiştir. Taramalı elektron mikroskobu görüntüleri dondurarak kurutulmuş örneklerin gözenekli ve tek düze bir yapıya sahip olduklarını ve nişasta taneciklerini iyi koruduklarını ortaya koymuştur. Dondurarak kurutulmuş ürünlerin en yüksek rehidrasyon oranı değerinin 5.20 olduğu tespit edilmiştir.

Anahtar Kelimeler

Dondurarak kurutma, Modelleme, Renk, Taramalı elektron mikroskobu, Zencefil

Kaynakça

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