Effect of Ultrasound Pre-Treatment on Drying Characteristics of Carrot Slices

Year 2018, Volume: 16 Issue: 1, 11 - 19, 23.04.2018

Senem Tüfekçi Sami Gökhan Özkal

https://doi.org/10.24323/akademik-gida.415636

Cited By: 1

Abstract

The effects of
ultrasound pre-treatment prior to hot air drying on drying characteristics of carrot
slices were investigated. For pre-treatments an ultrasonic generator with 20
kHz frequency connected to an ultrasonic probe was used, time and amplitude
values were chosen as 20, 40, 60 minutes, and 55 or 100%, respectively. The air
velocity was 0.3 m/s and the drying air temperatures were selected as 50 and
60°C. Drying time of carrot slices decreased, and
drying rate increased by the application of ultrasound pre-treatment with
increasing pre-treatment time and amplitude. The Page and Modified Page models were
the most suitable models for describing the drying characteristics of carrot
slices. Tissue damage occurred by increasing the amplitude of ultrasound was
observed clearly in scanning electron microscopy images of dried samples.

Keywords

Carrot, Drying, Ultrasound, Pre-treatment, Mathematical modelling

Ultrases Ön İşleminin Havuç Dilimlerinin Kuruma Karakteristikleri Üzerine Etkisi

Abstract

Sıcak hava öncesi
uygulanan ultrasonik ön işlemin havuç dilimlerinin kurutma karakteristikleri
üzerine etkisi araştırılmıştır. Ön işlem için 20 kHz frekansa sahip ultrases
üreten bir prob kullanılmış olup ön işlem süresi 20, 40, 60 dakika ve ultrases
genliği %55 ve %100 olarak seçilmiştir. Kurutucunun hava hızı 0.3 m/s olup, kurutma
sıcaklığı 50°C ve 60°C olarak seçilmiştir. Artan ön işlem sürelerinde ve
genliklerde havuç dilimlerinin kuruma hızları artarken, kuruma zamanı
kısalmıştır. Havuç dilimlerinin kuruma kinetiğini açıklayan en uygun modellerin
Page ve Modifiye Page modelleri olduğu saptanmıştır. Artan genlikle beraber
havuç dilimlerinin dokusunda meydana gelen zarar taramalı elektron mikroskobu
görüntülerinde belirgin bir şekilde görülmüştür.

Keywords

Havuç, Kurutma, Ultrases, Ön işlem, Matematiksel modelleme

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