Retention of Trace Flavor Components on Spray Drying of Liquid Foods

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Retention of trace amount of flavor components (ethanol,1-menthol and d-limonene) were measured for drying of a single droplet in a hot stream.Several sample solutions,which were consisted of various concentrations of aqueous maltodextrin and trace amounts of ethanol.1-menthol or d-limonene,were used as model food liquid.Also,<beta>-cyclodextrin was added to the samples which contained 1-menthol or d-limonene.The retention of ethanol was increased by increasing initial concentration of maltodextrin,increasing the the air temperature and velocity,and decreasing the air humidity.The numerical simulation,based on the multi-component diffusion equation,was in good agreement with the experimental results of the retention of ethanol.The addition of <beta>-cyclodextrin resulted in an appreciable improvement of retentions of the thydrophobic flavor species (1-menthol and d-limonene).The retention were almost 100% under the drying conditions without inflations or expansions,and also were independent of the air temperature.The morpholohical change of droplet on drying (inflation and expansion of droplet) gave some complicated effects on the retention of flavor species,which were intimately related with the intensity and frequency of the inflation adn expansion.