• Food Drying Basics

    Drying or dehydrating is one of the oldest known methods of preserving foods. Safe and easy to learn it's an effective alternative to canning and freezing. Dehydrated foods are perfect for backpacking, hiking, camping and hunting. They utilize very little space, require no refrigeration and are considerably more lightweight than their whole counterparts.

    How does Drying Preserve Food?

    The process of drying/dehydrating removes moisture from food, which prevents bacteria, yeasts and molds from growing. In addition, drying inhibits the action of enzymes within the food, but does not inactivate them. Therefor, when the food is ready to be consumed, it can be re-hydrated and regain its original shape.

    Methods of Drying:


    1. Dehydrators: Food dehydrators are electrical appliances that usually have a thermostat to control the temperature as well as a fan and vents for proper air circulation. There are several models available for sale in varying price ranges. This is one of the more popular methods of drying because it cuts drying time in half as compared to oven drying.
    2. Dehydrofreezing: this method uses a combination of drying and freezing. This method removes only 70% of the moisture, which results in a tastier product. This method is not to be confused with freeze drying- which is a commercial technique that cannot be reproduced in the home.
    3. Indoor Air Drying (Room Drying) - this method is most effective for herbs or hot peppers. These items can be tied into small bundles and suspended from racks or string. Nuts can be effectively dried by spreading them into single layers on newspapers or parchment paper.
    4. Oven Drying: Before using this method to dehydrate foods, be sure that you can set the temperature to 140F. Food must be dried at this temperature, it the oven is set higher, the food will actually cook, rather than dry. Although it may appear to be dried, the inside may retain too much moisture, allowing mold to form, spoiling your food. To use the oven, set the temp to 140F, prop the door open slightly to allow for air circulation. Cooling racks placed upon cookie trays work quite well for foods such as jerky or fruits. The cookie tray will catch any drips and prevent a mess on the bottom of your oven.
    5. Solar/Sun Drying: this method uses the sun as the heat source, but in a specially designed dehydrating box which results in shorter drying times
    6. Vine Drying: Usually reserved for vegetables and legumes, this method is to leave the item (beans, for example) on the vine until the pods are shriveled and rattle when moved. This method is effective for several types of beans, navy, kidney,butter,great northern, lima, lentils, and soybeans. However, if the beans are dried in this manner, pasteurization is required to kill insects and their eggs.


    • Pasteurization Freezer Method: Seal foods and place in freezer (0F or colder) for 48 hours.
    • Pasteurization Oven Method: Place food in a shallow pan or cookie sheet in an oven that has been preheated to 160F. Bake at 160F for 30 minutes.

    Storing Dried Foods

    Dried foods must be stored in a cool dry place away from moisture and heat. Overly warm storage conditions will cause the food to sweat, thereby creating enough moisture for mold to grow.

    Store the dried food in clean, dry containers in quantities necessary for the preparation of your favorite recipes.

    Do not store any sulfured fruits in metal containers, as the fumes will react with the metals and cause changes in color.

    Recommended Storage Times:


    • Dried fruits stored below 60F will last for 12 months, safely.
    • Dried Fruits stored at 80F will last for 6 months
    • Vegetables stored at 60 F will last approximately 6 months
    • Vegetables stored at 80F will last approximately 3 months

    Please note that it is possible for Stored Foods to reabsorb some moisture during storage. It is important to choose proper containers and maintain proper storage temperatures to prevent spoilage.
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    Comments 5 Comments
    1. bjsdeb's Avatar
      bjsdeb -
      I love your site. It is awesomeness in information. My question is: If we do our own dehydration of veggies or fruit why is the shelf life shorter than when we would purchase it at honeyville, etc???

      Thanks
    1. bjsdeb's Avatar
      bjsdeb -
      I love your site. It is awesomeness in information. My question is: If we do our own dehydration of veggies or fruit why is the shelf life shorter than when we would purchase it at honeyville, etc? I am putting them in class jars or mylar food grade bags with oxygen absorbers, so I don't understand why the difference in shelf life.

      Thanks so much,
      Deb
    1. Liss's Avatar
      Liss -
      Quote Originally Posted by bjsdeb View Post
      I love your site. It is awesomeness in information. My question is: If we do our own dehydration of veggies or fruit why is the shelf life shorter than when we would purchase it at honeyville, etc???

      Thanks
      Thank you very much!

      The reason why home dried foods don't last as long is because commercially dried foods utilizes several different types of preservatives which can include:


      • Benzoic Acid- prevent microorganisms from growing in acidic fruits
      • Sodium benzoate
      • sodium sulfite- Used to preserve color in dried fruit.
      • Sulphur dioxide- Used to preserve color in dried fruit.
      • potassium sorbate- A mold and yeast inhibitor.
      • sodium tripolyphosphate

      Also, many of the commercially prepared foods are actually freeze dried, rather than dehydrated with heat.

      Some foods are blanched first too, which makes a difference in how long they last.
    1. TeddyJ's Avatar
      TeddyJ -
      Wanting to dehydrated onions, what is the best way to do this? Thank you
    1. METRU999's Avatar
      METRU999 -
      I WANT TO KNOW HOW TO CAN AGAIN? PLUS DEHYDRATING FOOD!!! NO HUNGRY NO MORE!!!


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