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Biltong food safety

Biltong food safety

Biltong, the cured and dried meat product that originated in Southern Africa, is one of the most popular uses for our commercial dehydrators. Africa. Traditionally, biltong was air dried in the hot African sun, but for a more consistent product for commercial sale, the use of a dehydrator is the safest choice.


The word biltong is Afrikaans and is derived from the Dutch words ‘bil’ (meaning buttock) and ‘tong’ (literally meaning tongue, but also used to mean strip). Biltong today is usually taken to mean long strips of spiced and dried meat.


Because biltong is dried at a lower temperature than some other cured meats, food safety at every step is paramount. Manufacturers should familiarise themselves with the Food Standards Code and all legal obligations.


Sourcing meat

Biltong is best made with lean cuts of meat. This is because fats can go rancid, ruining your biltong and reducing the shelf life.


It’s essential to ensure the meat you are using for biltong has been appropriately stored at the right temperatures before getting to you. When raw materials are received, they should be checked, particularly for temperature. Meat should be no warmer than 5°C if pre-portioned and 7°C for carcasses.


Upon receipt, raw materials need to be:

  • Moved to storage or processing as soon as possible
  • Maintained at appropriate safe temperatures
  • Protected from contamination or damage
  • Stored on their own or in clean containers on racks or shelves to ensure no contact with the floor or other surfaces
  • Used on a first-in-first-out basis


Marinading

Using a vinegar marinade is an important part of making biltong. Different vinegars can be used when making biltong and developing your perfect recipe, but brown vinegar and cider vinegar are two of the most common choices. This is combined with sea salt, pepper and spices as part of the marinade. The most common spice is coriander, reflecting Southern Africa’s history as a key stop on spice routes from Asia. Piri-piri and other chillies are also common and popularly used flavourings.


Vinegar helps to inhibit bacterial growth, by increasing the acidity. Marinades also contain salt and spices to flavour the meat. As well as providing seasoning, salt is also important for lowering the water activity level (see Drying Times). A low water activity level inhibits the growth of many pathogens.


The combination of the vinegar and salt is an important part of the curing process to inhibit bacteria. The wet marinade helps to promote a uniform flavour and distribution of salt and spices. Marinading times of 12 to 24 hours are common, and for food safety, this should be done in a refrigerator at between 0 to 4°C.


Drying times

A critical aspect of making biltong is that the environment must be dry. You’re looking to replicate the dry heat of Southern Africa. Meat and Livestock Australia recommends drying biltong at around 30 to 35°C with high air movement. For biltong that is intended for commercial production, the best way to ensure a consistent temperature and safe final product is through a dehydrator where temperature and humidity can be controlled.

Some biltong makers will use solar drying or unheated air but this is not recommended for a commercial product due to the unpredictability and unnecessary health risks.

The Food Standards Code, specifically section 2.2.1 states that dried meats, including biltong, must be dried to a water activity level of less than 0.85 aw to prevent microbial growth. Weight loss of the meat is a good indicator of water activity.

The rate and amount of drying will be influenced by:

  • The rate of air flow over the product
  • Difference between the relative humidity of the air and relative humidity/moisture of the food
  • Moisture diffusion within the product (be aware of drying occurring too quickly causing the surface to dry before the centre)
  • Thickness and diameter
  • Time
  • Temperature

Biltong should be dried hanging from hooks without the pieces of meat touching each other to ensure even air flow and prevent mould development.

Biltong is usually sold as either ‘wet’ or ‘dry.’ Wet biltong is softer and usually remains pink in the middle, while dry biltong is harder and, as the name suggests, more fully dried out. Wet biltong is often recommended to be kept refrigerated. 


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Water activity

Water activity (aw) is a measure of available water in the food. That’s not as simple as how much water is in the food though, as some water is bound to other ingredients – like sugar or salt – and isn’t available. In the context of dehydration, this is important as it is the available water that microorganisms will use to facilitate growth.


When too much water is available, this allows microorganisms to grow. Pure water has aw=1.00 and raw meat has aw=0.99. 


The safest and most accurate way to monitor water activity is by using a water activity meter. It is also possible to measure weight loss to determine moisture loss, but this is not recommended for commercial applications. The aim with biltong is to achieve a water activity level of around 0.75 and a moisture content of about 20%.


Cleaning

There’s a saying in beer brewing that cleanliness is next to Godliness. It’s the same for dehydrating, especially for meat products like biltong.


There are some basic principles that should be maintained in any environment where meat and food products are being prepared. This includes:

  • Having a safe water supply
  • Maintaining food contact surfaces in clean condition
  • Preventing cross-contamination
  • Hand washing, hand sanitising and toilet facilities
  • Protecting food, food packaging materials and food contact surfaces from things like lubricants, fuel, pesticides, cleaning compounds, sanitising agents, and other chemical, physical and biological contaminants
  • Labelling, storing and using toxic compounds safely
  • Controlling employee health
  • Excluding pests
  • Confining and removing wastes


It’s vital to ensure that you practice the highest standards of hygiene at every step. 


Cleaning your dehydrator is also essential. Best practice is to clean your dehydrator between every batch. For our dehydrators, the trays are dishwasher safe and the insides of the dehydrator should be cleaned using a cloth and warm soapy water (being careful not to splash water onto the electrical parts). Using a food-safe sanitiser spray to eliminate microbial growth is also recommended. Any cleaning chemicals should be appropriately stored, and staff need to be trained on how to use cleaning chemicals safely so as not to cause accidents or contaminate foods.


It’s also important to ensure equipment is thoroughly dried after cleaning. This is to prevent Listeria contamination.


As well as cleaning on a daily basis, including throughout the day, regular cleaning and sanitising should be scheduled for things like cool rooms and drains. It’s also a good idea to regularly clean shelving in chillers, door handles, door seals, switches.


Calibrating equipment

All equipment used for monitoring should be regularly checked and calibrated to ensure accuracy. This includes:

  • Thermometers: check weekly
  • Cool room gauges: check monthly
  • Dehydrator temperature gauges: check monthly
  • Water activity meters: according to manufacturer’s instructions
  • Scales: according to manufacturer, by an approved agency


Packaging and labelling

The Canadian Food Inspection Agency provides a food labelling tool to help producers navigate specific requirements. This includes:

  • Bilingual labelling
  • List of ingredients and allergens including sweeteners, additives and irraditated foods
  • Quantity
  • Country of origin
  • Nutrition
  • Storage instructions

There are also specific requirements for meat and poultry products, including ready-to-eat products like biltong.


Shelf life

The shelf life of biltong varies depending on whether it is ‘wet’ or ‘dry.’ A wet biltong has a higher moisture level so can be more susceptible to mould development. For businesses and customers living in a more humid environment, care should be taken with the storage of biltong to reduce the moisture that the biltong is exposed to.


Many manufacturers recommend that after purchase biltong should be kept in a refrigerator in something like a paper bag, rather than a sealed container, to allow the biltong to breath. Biltong can also be stored in the freezer for up to one year.


Whether biltong is sold fresh at a butcher or in plastic packaging with an oxygen scavenger, it should usually be consumed within 4 to 6 days of opening. Consumers should be alert to mould development and store any opened biltong in a dry environment where it can breathe.


Meat and Livestock Australia recommends that for product with a water activity level greater than 0.7, packaging should be used to prevent mould growth. This packaging should:

  • Have low oxygen and moisture transmission rates
  • Contain an oxygen scavenger


Packaging suppliers recommend packing biltong in bags with high barrier plastics such as EVOH, PVDC or Nylon. You can also get packaging that is suitable for use with vacuum or flush and seal machines to reduce oxygen in the pack which can impact shelf life.


Got questions about how to use your commercial dehydrator safely?

If you have any questions about cleaning your commercial dehydrator, recommended settings, or other aspects to ensure a safe final product, let us know. We’re here to help guide you to producing biltong and other dehydrated foods that are delicious and healthy. 




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Sean Mclellan

His outstanding knowledge of the ins and out of the dehydrators has helped push for the innovation and improvements to the machines that our customers love. He considers himself a bit of a Bond character, spending late nights at the baccarat table sipping on martinis cracking jokes to random strangers. His pass time passion is smoking and dehydrating meats for poker nights and friends parties.

sales@commercialdehydrators.com.au