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Designing the Internal Porous Structure of Soluble Coffee Particles to Improve Freeze-Drying and Functionality
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Designing the Internal Porous Structure of Soluble Coffee Particles to Improve Freeze-Drying and Functionality
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eBook
Designing the Internal Porous Structure of Soluble Coffee Particles to Improve Freeze-Drying and Functionality
2023
Overview
The objective of this work was the understanding of the internal pore structure creation of instant coffee. It includes the question which parameters are influencing the pore structure and mapping the applicable ranges. The influence of these structural parameters on the drying kinetics were investigated in experiment and modeling, finding the optimal approach to increase the drying kinetics. The reconstitution behavior of the dried powder structures was analyzed to link the process optimization to product quality aspects. The instant coffee was structured in a scraped surface heat exchanger and with different freezing methods, where samples were gassed with nitrogen and carbon dioxide. The amount of gassing, the total solids content, the coolant temperature, the scraping speed, temperature cycling and the freezing rate of the slurry during hardening were shown to influence the morphology of the samples, where total solids content, gassing, temperature cycling and freezing rate showed a dominant influence in the investigated range on structure parameters like open porosity, closed porosity and the median pore diameter, obtained after drying. It could be shown that the pore diameter has the biggest potential to improve drying and reconstitution kinetics.
Publisher
Cuvillier Verlag
Subject
ISBN
9783736967267, 3736967268, 9783736977266, 3736977263
