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Type: Artigo de periódico
Title: Microscopic features, mechanical and thermal properties of osmotically dehydrated guavas
Author: Pereira, LM
Carmello-Guerreiro, SM
Hubinger, MD
Abstract: The effects of an osmotic dehydration process using sucrose and maltose solutions at 40 and 60 degrees Brix on microscopic features and some mechanical and thermal properties of guava tissue were studied. Also the addition of calcium lactate to the sugar solutions, aiming at preserving the structure of the processed fruits, was investigated. The guava texture (stress at failure) and the structure as observed by light microscopy were both evaluated, and differential scanning calorimetry (DSC) was used to verify the in; teraction between calcium ions and cell wall pectin in the guava tissue. The calcium content of the differently treated samples was also related to microscopic features, mechanical and thermal properties of guavas. The osmotic process using sucrose and maltose solutions caused severe structural damage to the guava tissue, and this effect was intensified at higher sugar concentrations and by the use of sucrose solutions. The addition of calcium lactate promoted maintenance of the guava structure, showing turgid cells with well-defined cellular contours, resulting in an increase in hardness and indicating bonding between the Ca(2+) and cell wall pectin, which was confirmed by the DSC experiments. (c) 2008 Swiss Society of Food Science and Technology. Published by Elsevier Ltd. All rights reserved.
Subject: Microscopy
Stress at failure
Calorimetric measurements
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.lwt.2008.06.002
Date Issue: 2009
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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