Why you need a freeze dryer?

Freeze-dried food is growing in popularity with backpackers and chefs alike, and now home freeze dryers are making their way onto the market too. The ads are dazzling, with snazzy, futuristic possibilities: one button, and you can join the “space-age” diner; what a beautiful end to food waste! This exciting, sexy new era gadget is hard to resist — especially for tech-savvy types.

However, is a home freeze dryer right for you? Do the ads match the reality of the dream? Well, we’re here to demystify all the advertising hype and give you a level-headed rundown on the good, the bad, and the ugly about home freeze dryers so you can make an informed purchase.

What is freeze drying?

Freeze-drying, or lyophilization, is the process of freezing a product and creating a vacuum so that moisture is removed, according to the FDA. It does this by sublimating ice into vapor, skipping the liquid phase altogether. It consists of three separate but interdependent stages, namely freezing, primary drying (sublimation), and secondary drying (desorption). The food is frozen, and this is combined with a scientific principle called "sublimation," which refers to the process by which the ice (solid) contained in frozen food changes into water vapor (gas). Via the process, the food preserves its initial texture, flavour, and vitamins even as rehydrated.

Freeze drying follows two simple processes: freezing and vacuum drying. Food is frozen to a temperature far below 0°F (-18°C) First The lower the freezing temperature the next step will be more efficient. The food is then frozen and vacuum dried, which means that both air and water vapour (as gas) are removed from the food processing chamber by a vacuum pump. This process involves extracting the moisture from the food. When those two steps have been followed correctly, the food will be properly dehydrated and safe to stored at room temperature.

Is Freeze-Dried Food Safe? Yes, If...

Freeze-dried food is safe as long as the two main processes—freezing and vacuum drying—are properly performed:

Subsequently, we detail the two essential steps in the lyophilization process: freezing and sublimation.

As an example, safely refrigerated food means that it reaches 41°F (5°C) or below within 1-4 hours or less. You can pre-chill or pre-freeze foods before placing them in the freeze dryer to mitigate this concern, however.

Safe Drying Process: The drying process, designed to make sure that the food is brought to a “safe residual moisture level.” At home, most cooperative resources indicate that food should be dried to a “crispy” or “brittle” texture in order to know that it is safely prepared. However, foods with more sugar, such as fruit, may bend slightly instead of crumbling when properly dried, but should not be sticky.

It should be noted that the food is handled using appropriate food safety handling techniques prior to the freeze-drying process. Freeze-drying does not kill bacteria; it mostly removes moisture, which helps to slow bacterial growth but does not sanitize food. For these reasons, food safety during the freeze-drying process must begin before the process itself begins with proper handling of food and sanitation.

What Happend After Freeze Drying to Microbes?

Not much. Micros are active but dormant even in freeze-drying's extreme conditions. Indeed scientists have freeze dried microbes in laboratories for later study; they can live for decades after they are rehydrated.

Well, when you freeze-dry raw foods at home the microbes on those foods are alive and they will reanimate themselves when rehydrated. So foods that need to be cooked before consumption — like raw meat, raw seafood, raw eggs and dishes featuring those ingredients — still require cooking before eating, even after freeze-drying.

In short, freeze-drying preserves the food and inhibits bacterial growth but does not kill harmful microbes. Always cook any raw foods even post freeze-dry.

Is It Possible to Vacuum-Seal Freeze-Dried Food?

Yes, you can vacuum seal freeze-dried foods as long as they are also dry to a very low moisture level. But vacuum sealing alone is not a food safety procedure. Indeed humidity can even promote botulism and toxin production if you remove the oxygen from the packaging.

Fortunately the absence of moisture (water) means that botulism (and all the bacteria, yeast and mold) cannot grow. So vacuum sealing food that has been properly dried or freeze dried safe to do so particularly in containers along with oxygen absorbers or vacuum sealed bags.

In closing now as long as the food is freeze dried and dry vacuum sealing it will help with long term safe keeping.

Conclusion

What is the final thing you want your product to do? Backpacking? Family meals? Or the apocalypse?

Before settling on a home freeze-dryer, it is important to figure out why it is needed. Will you mostly be using it as a place to make backpacking meals, for family gatherings, or landfill and/or long-term emergency storage? Your response will affect what types of foods you freeze-dry and how you use the machine.

Which foods taste the best?

Some foods may have a better taste when preserved with traditional methods but some may be good with freeze-dried. The Can Size Guide Labels are professionally printed with easy-to-read type and brightly colored index tabbed labels that help you quickly identify your can sizes. Conversely, certain meats or shapes may not do well with freeze-drying. You’re going to have to experiment and see what foods you like. Testing out some commercially available freeze-dried meals can also help you understand what works for you.

Is freeze-drying within your budget?

A home freeze-drying machine does have an upfront cost, and also costs for consumables and electricity. If you plan on using the machine frequently, though, it is wise to make sure that this aligns with your budget. To help you determine whether the machine is a wise financial investment for your household, compare the price with how often you plan to use the device—be it occasional or over the long haul.

Is the machine the right fit for your family?

Not every home can accommodate the space or energy demands of a freeze-drying machine. Ensure the machine will fit in the layout of your home, that you have enough space and that any surrounding area is well-ventilated for proper operation. If you have a busy family and if you expect frequent use, make sure that the machine fits effortlessly into your everyday life.

In the end, knowing your objectives, flavor preferences, money constraints, and physical space will guide you to control whether a home freeze-drying workhorse would be a beneficial addition to your home.