Sunday, April 9, 2017

An update on vacuum sealed food

Since we have taken up vacuum sealing food quite recently, there still is a lot we need to learn about it. Scouring the internet for information on the subject, I came across the following article and thought it might be a good idea to share it with you.
It comes from readynutricion.com and was written by Tess Pennington.
if you follow the link you will find more information about oxygen absorbers and related topics too.

Vacuum sealing, or ROP (Reduced Oxygen Packaging) slows down the process of spoilage by reducing atmospheric oxygen, and creates an anaerobic environment that  limits the growth of aerobic bacteria or fungi, and prevents the evaporation of volatile components. Vacuum sealing is often used in combination with other packaging and food processing techniques.
As effective as this food storage source seems, it could put your health at risk. There are certain types of bacteria that prefer low oxygen environments and will grow on foods that have been vacuum sealed. Knowing the dangers that these bacteria possess can help you avoid them and keep your food storage safe.

Botulism and Listeria Monocytogenes

Even in an oxygen-depleted environment, Anaerobic organisms can proliferate, potentially causing food safety problems. Botulism and Listeria monocytogenes are examples of pathogenic bacteria that cause food borne illnesses from growing and thriving in an anaerobic environment. Moreover, these bacteria have the capacity of growing at a faster rate in vacuum sealed foods due to the oxygen-free environment as well as the fact that these bacteria are not in competition with other spoilage bacteria. These bacteria often do not produce noticeable changes in the foods; therefore, relying on sight, smell and taste would not be helpful. However, only a tiny amount of these spores (a few nanograms) need to be present in order for them to be deadly.
According to the FDA, the following are dangers associated with vacuum sealing food sources:
  • Facultative bacteria (most foodborne pathogens) grow under aerobic & anaerobic conditions
  • Most spoilage organisms are no longer “indicators” for temperature abuse
  • Extended shelf life could allow “slow growers” to reach high numbers under refrigerated conditions
  • Secondary barriers such as low pH or aw are not always possible with cook chill and sous vide packaging
  • Potential for temperature abuse at retail and in the home is great
  • Cooking and fermentation destroy most vegetative cells but spore formers survive

Safety Guidelines for Vacuum Sealing Food

If you have  taken proper steps in preparing your food in a clean and uncontaminated environment, then this should not be a problem. However, if there is any question about the safety, then err on the side of caution and do not vacuum pack the food, as you would be creating a perfect breeding ground for bacteria.
Follow these guidelines to properly vacuum seal food:
  1. Vacuum sealing food does not replace the need to pressure can or water bath home canned foods.
  2. Wash hands before and during the vacuum sealing process.
  3. Try not to touch food with your hands. Use clean spoons, tongs or something else to handle the food.
  4. Be sure to keep utensils, cutting boards and counters clean.
  5. Keep vacuum sealed foods in the refrigerator or freezer. Dry food, like crackers and nuts, can be stored at room temperature.
  6. Freeze low-acid vacuum packaged foods and consume immediately after heating. Never heat a low-acid vacuum packaged food and allow it to stand at room temperature in the vacuum package.
  7. Ensure that you do not cross contaminate food.
  8. Properly label food sources with type of food and date packaged.
  9. Ensure the seal is complete and that there is no debris in the seal.

Which Foods are Safe and How Long Do They Store?


Shelf life of vacuum packaged foods
FoodStored InNormal Shelf LifeVacuum Shelf Life
Large cuts of meat: beef, poultry, lamb and porkFreezer6 months2-3 years
Ground meat: beef, poultry, lamb and porkFreezer4 months1 year
FishFreezer6 months2 years
Coffee beansRoom temperature4 weeks16 months
Coffee beansFreezer6-9 months2-3 years
Berries: strawberries, raspberries, blackberriesRefrigerator1-3 days1 week
Berries: cranberries, huckleberries, blueberriesRefrigerator3-6 days2 weeks
Cheese – hard, semi-soft and pasteurized cheeses.*Soft cheeses such as Brie, Camembert, Ricotta, Cottage and Teleme MAY NOT be vacuum packagedRefrigerator1-2 weeks4-8 months
Cookies, crackersRoom temperature (periodically opening)1-2 weeks3-6 weeks
Flour, sugar, riceRoom temperature6 months1-2 years
LettuceRefrigerator3-6 days2 weeks
NutsRoom temperature6 months2 years
Oils with no preservatives, like safflower, canola, corn oilRoom temperature5-6 months1-1.5 years
WineRefrigerator1-3 weeks2-4 months

Above table adapted by Tilia Inc. from Dr. G.K.York, Dept. of Food Science & Tech, U of California, Davis
Vaccum sealing food can be a productive way to maintain your food source as well as prolong its shelf life. Ensure that you take the proper steps in handling and storing your  food to reduce the presence of bacteria in your food storage.

vacuum sealing can be hazardous to your health

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