vacuum freeze-drying of coffee news
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Several precautions for vacuum freeze-drying of coffee
The eutectic point of coffee concentrate significantly drifts with solid content, roasting degree, and whether milk/sugar is added, usually in the range of -20 to -30 ℃. The pre freezing termination temperature should be lower than the eutectic point, and the shelf temperature should be 3-5 ℃ lower than the eutectic point, otherwise collapse and agglomeration may occur. Suggest using DSC or resistance method to test the specific formula.
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