Preserving dehydrated fruits and vegs
We bought a food dehydrator to make dog treats with. Primarily we're dehydrating yams, apples and bananas. I'm not dehydrating these to crisps because I didn't think I needed to. The dehydrated yams that we buy as dog treats are still pliable and leathery, so I didn't think I needed to dehydrate them totally dry.
The problem I'm having is that these treats are going moldy in about 4 days. Again, the treats we buy never go moldy. I'm assuming they're adding something to the commercial version to stop this.
Does anyone have some hints on what I'm doing wrong or any idea what the commercial brand is putting on them to stop this. The apples seem to be the slimiest first... Should I be drying the apples to crisps?
Best Answer
You get mold (and less visibly, bacteria) growth after 4-5 days because your water (humidity) content left in the deyhdrated food is greater than 5%. Typically dried apples (and other types of fiberous dried fruit) have humidity levels closer to 20% when you don't dry them to a crisp. That means the treats you make aren't shelf stable, but luckily this can be fixed with some experimentation.
Each food has it's own requirements for preservation. Here are some quick guidelines to try out on apples. For yams and bananas, I would try dehydrating them a bit more closer to being crisps.
Steps:
Wash fruits thoroughly before dehydrating. I don't do this, but you could try using a "fruit wash" (product for washing fruit).
Dehydrating isn't sterilization - the dehydrator isn't hot enough to sterilize the food, so some of these 'nasties' are left on there and waiting for their chance to grow. Commercial-grade food is always sterilized. Because a dehydrater isn't sealed well, I suggest you nuke the treats in your oven for 5-10 minutes on high heat AFTER you dehydrate the stuff, experimenting to make sure you don't dry them out too much in the oven. Also, be careful because the sugar is concentrated in dehydrated fruit, so it will burn easily. Wrapping the fruit in tin-foil before placing it in your oven is a potential trick because this effectively sterilizes the fruit in a steam bath. If you use foil, you'll need to cook them longer - start with 15 minutes.
After the treats are dehydrated and sterilized, try storing them in air-tight containers and always away from light in a cool/dark place. They need 7-10 days to "equilize" the moisture between each dried piece of fruit. Make sure to shake the containers every once in a while so they don't all stick together.
BEYOND THIS, there are more advanced techniques that you can easily try - including conditioning the dried fruits and a number of fruit-baths that preserve the fruits with harmless chemical solutions, like Ascorbic Acid (vitamin C). Try reading more on this link from UC Davis:
http://homeorchard.ucdavis.edu/8229.pdf
(Start Reading on Page 7).
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Quick Answer about "Preserving dehydrated fruits and vegs"
Pack foods into clean, dry insect-proof containers as tightly as possible without crushing. Store dried foods in clean, dry home canning jars, plastic freezer containers with tight-fitting lids or in plastic freezer bags. Vacuum packaging is also a good option. Pack foods in amounts that can be used all at once.How long do dehydrated fruits and vegetables last?
Most home dehydrated food, when prepared and stored correctly, can last for months and up to a year. But a lot depends on the storage method and storage environment. Fruits & Vegetables: 1 year for fruit, about 6 months for vegetables at 60F (source: NCHFP), though vacuum sealing can extend the shelf life.How do you store dehydrated vegetables long term?
4 Tips for Storing Dried VegetablesHow long does dehydrated fruits stay good?
How long does dried fruit last. According to the National Center for Home Food Preservation, dried fruit lasts from 4 to 12 months when properly stored, but the quality of stored food does degrade more quickly in warm temperatures.Does dehydrating fruit preserve it?
Drying fruit is an excellent way to preserve the harvest from your backyard garden, and makes a delicious snack for months to come. Unlike frozen fruit, jams, and preserves, dried fruit is a convenient take-along snack that stays in prime condition for months.HOW TO STORE DEHYDRATED FOOD: Tips for the perfect storage container for dried foods | DRYCEMBER
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