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2 kilograms of organic waste yields a kilogram of insect protein extract
The energy content of edible insects is similar to traditional fresh meat – around 500 calories for every 100g of dried product. Insects have an excellent protein density (between 45 and 65% protein by mass) and require far fewer resources to breed and rear than other farming practices.
While insect protein processing technology addresses the “protein gap,” insect farming also converts organic waste to a high-efficiency rate. With only 2kg of feed from food waste and a mere square meter of space, farmed insects can produce up to 1kg of protein.
Substitute fishmeal powder with insect protein extract
The aquaculture sector has already embraced the potential for insect protein. Protein derived from insects such as house fly larvae is a near-analog of fishmeal protein traditionally used as the base for commercial fish feed.
Processed insect protein is a more sustainable aquafeed ingredient and can replace traditional fishmeal powder from the feed mix.
Insect protein for use in agricultural animal feed
Insect protein from black soldier fly larvae (BSFL) is a suitable alternative base ingredient for pet food. Besides protein, BSFL contains fats and oils to make a richer foodstuff for domestic animals.
The high absorbency of insect protein makes it particularly useful as a base for pet food for animals with allergies and sensitive stomachs. Black soldier flies are reared on biomass from other agricultural processes and extract up to 70% of proteins. This makes them a highly sustainable option for animal feed.
Insect protein processing technology can be adapted for food-grade applications
Protein derived from farmed crickets has been granted novel food status in the European Union. Harvested insects are dried and ground into protein-rich powders.
So-called “cricket flour” can be used to make a whole range of foods, including cricket burgers, cookies, and performance products.
Freeze-dry mealworms to conserve their protein content
Previously produced commercially as fishing bait and pet reptile feed, mealworms are increasingly being farmed as an alternative source of protein. They require only 10% of the land needed for livestock and have a smaller greenhouse footprint.
Mealworms are rich in protein and retain around 40% of their content when freeze-dried. Mill the insects into a powder to broaden its application in the food and feed sector.
Heat sensitivity is a production challenge for insect processing
Insect protein processing technology encompasses farming, extraction, and finishing. Typically, the process includes two stages: separation & extraction and drying & milling.
But insect material is temperature sensitive and presents particular handling challenges. Moreover, since insects are often reared on wet feed, processing contends with poor flow characteristics and cohesive tendencies.
Apply indirect drying for gentler treatment
Drying is a delicate step in the insect processing line because it can alter the properties of the material. Under-dried insects develop bacteria, while over-drying causes scorching and reduces the protein’s nutritional value.
Two main types of dryers are used: Direct and Indirect drying. Direct drying is when the material is treated with hot air at a temperature of 200-300ºC as it goes through the heat exchange unit. This is quicker, but heat damage is much more likely if the process is not carefully controlled. Indirect drying offers a gentler approach. In this technique, the energy transfer is performed through a heating medium like steam-heated discs.
Insect protein powder for human consumption must be milled to a finer grade
The last step in insect protein processing is milling or grinding. The material can be milled into powder of different grades according to its final use. Powders intended as insect “flours” for baking and food recipes must be ground very finely. Ingredients for soluble products like protein drink powders require ultra-fine milling.
However, a coarser grade is more appropriate if the final use is for animal feed. Choosing a combined drying and milling solution can give you the edge in terms of efficiency and ROI.