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Mass transfer coefficient and the characteristics of coated apples in osmotic dehydrating

Paper ID Volume ID Publish Year Pages File Format Full-Text
19382 43062 2011 8 PDF Available
Title
Mass transfer coefficient and the characteristics of coated apples in osmotic dehydrating
Abstract

In a dynamic osmotic dehydration from 0 to 180 min, the influence of different edible coating materials such as Low-Methoxyl Pectinate (LMP), Carboxyl-Methyl Cellulose (CMC), Corn Starch, and an osmotic sucrose solution with two concentration of 50% and 60% (w/w) on apple rings and their physical characteristics were studied, which included: moisture loss (ML), solid gain (SG), ML/SG ratio, effective diffusivity of solute and water (Des, Dew). The qualitative characteristics such as: firmness of the texture or shear stress (SS), and Browning index (BI) were also tested. Using Fick's first and second laws, the effective diffusion coefficient of water and solute were calculated. Osmosed apples in solution with 60% sucrose concentration, showed higher ML/SG ratio than other samples and, apples coated with 2% CMC and osmodehydrated in 60% sucrose, showed not only higher ML/SG ratio but higher diffusivity coefficient as well. The results showed that in comparison with non-coated samples, coating process can cause to improve the textural structure of the apple rings. By increasing the concentration of osmotic solutions, the Browning index (BI) of both coated and uncoated samples decreased.

Research highlights▶ Dynamic osmotic dehydration study on apple rings with different edible coating. ▶ Parametric study of moisture loss, solid gain, diffusivity, texture and browning. ▶ Comparing of edible coatings and non-coated osmodehydrated apples. ▶ Finding of optimal conditions: CMC concentration of 2% and 60% sucrose.

Keywords
Osmotic dehydration; Firmness of texture; Diffusion coefficient; Browning index; Edible coating
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 89, Issue 4, October 2011, Pages 367–374
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us