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Effect of separation and thawing mode on block freeze-concentration of coffee brews

Paper ID Volume ID Publish Year Pages File Format Full-Text
19105 43045 2013 7 PDF Available
Title
Effect of separation and thawing mode on block freeze-concentration of coffee brews
Abstract

Coffee brews were freeze-concentrated using block technique to evaluate the effect of thawing temperature, thawing mode and separation mode on solute yield. Samples were frozen and solute recovered using different thawing and separation conditions. Three thawing temperatures (20, 4 and 1 °C), two thawing modes (microwave assisted and free thawing) and two liquid fraction separation modes (gravitational and vacuum assisted) were tested. Solute yield was evaluated as a function of thawing ratio. Data were fitted to a monomolecular model to compare separation quality by means of the solute recovery ratio for each treatment. A combination of microwave assisted thawing and vacuum separation showed the best results in terms of solute recovery ratio. On the other hand, applying microwave assisted thawing or vacuum separation individually did not significantly enhance the solute recovery ratio. Additionally a thawing temperature effect on the solute recover ratio was also found. These results show that it is possible to improve the separation quality of Block FC by combining this technology with vacuum-assisted separation microwave heating. These results suggest that block freeze-concentration has potential industrial application.

► Coffee brews were freeze-concentrated using the block technique. ► The effect of thawing and separation mode was evaluated. ► Combination of microwave thawing and vacuum separation showed the best results. ► The effect of thawing temperature on the solute recovery rate was significant. ► Data were adjusted to a monomolecular model.

Keywords
Cryoconcentration; Thawing; Coffee; Vacuum; Microwave; Solute yield; Monomolecular model
First Page Preview
Effect of separation and thawing mode on block freeze-concentration of coffee brews
Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 91, Issue 4, October 2013, Pages 396–402
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering