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Binding up free water slows down bacteria and mold growth, because those microorganisms need water to thrive. Normally, this trait is helpful for food preservation. This is because sugar binds to free water molecules, preventing them from escaping the food. No matter how long you leave them in, they will still be a little (or a lot) sticky. Some foods like very high sugar content fruit, jams or jellies do not freeze dry well. Freeze Drying Mistakes #3 – Attempting to Freeze Dry High Sugar Foods Since then, we've been careful to keep sweet and savory foods separate, with good results. The flavor was subtle, but it was definitely there (and green bean bananas do taste as bad as they sound). Maybe those folks have wonky taste buds, but when we freeze dried green beans and bananas in the same batch of food, we ended up with green bean flavored bananas. There are a number of sources that say you can mix and match even strong flavored foods in the vacuum chamber, as long as you put the strong flavored food (like onions) on the top shelves. Freeze Drying Mistakes #2 – Mixing Foods with Dissimilar Flavors If you wouldn't mix the foods on a kitchen cutting board, don't mix them in the freeze drying chamber. Please don't mix foods like fruits and vegetables that are intended to be eaten raw with raw meat. (The sublimation process takes the water in the food from frozen to vapor, skipping the liquid state.) This means your odds of any bacteria on your raw meat surviving the freeze drying process are pretty high.ĭuring the freeze drying process, water vapor moves around the freeze drying chamber. Scientists use freeze drying to preserve bacteria samples. Just like in the rest of the kitchen, you want to avoid cross contamination to prevent the spread of e coli and other bacteria.

Freeze Drying Mistakes #11 – Mixing Food Sizes and Stacking the Food Unevenly on the Traysįreeze Drying Mistakes #1 – Mixing Raw Meat with Other Foods.

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Freeze Drying Mistakes #10 – Filling the Freeze Dryer Too Full.

Freeze Drying Mistakes #9 – Filling the Trays with Liquid Before Loading Them in the Unit.

Freeze Drying Mistakes #8 – Freeze Drying Fruit with Tough Skins Whole.

Freeze Drying Mistakes #7 – Expecting Quick Drying in Hot Weather.

Freeze Drying Mistakes #6 – Not Using a Liner in the Pans.

Freeze Drying Mistakes #5 – Freeze Drying Large Pieces of Meat.

Freeze Drying Mistakes #4 – Trying to Dry High Fat Foods.

Freeze Drying Mistakes #3 – Attempting to Freeze Dry High Sugar Foods.Freeze Drying Mistakes #2 – Mixing Foods with Dissimilar Flavors.

Freeze Drying Mistakes #1 – Mixing Raw Meat with Other Foods.