vacuum freeze-drying process for berries
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Three important aspects of vacuum freeze-drying process for berries
When blueberry jelly is dried, it is best to scratch/puncture the surface of the fruit to help remove moisture. Color protection can be achieved by soaking in 0.5% -1% citric acid or citric acid+vitamin C for a short period of time, and if necessary, blanching to kill enzymes to prevent anthocyanin oxidation and discoloration.
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