Method to convert insects or worms into nutrient streams and compositions obtained thereby
A method to convert insects or worms into nutrient streams, such as a fat-containing, an aqueous protein-containing and a solid-containing fraction, includes (a) squashing insects or worms thereby obtaining a pulp, wherein the insects or worms are reduced in size, (b) heating the pulp to a temperature of 70-100° C., and (c) subjecting the heated pulp to a physical separation step, preferably decanting and/or centrifuging. The method does not comprise enzymatic treatment of the pulp. The fat-containing fraction comprises at least 80 wt. % insect or worm fat of which at least 40 wt. % are saturated fats. The aqueous protein fraction can be dried to obtain dried protein material, which contains at least 50 wt. % insect or worm protein-derived matter and at most 25 wt. % insect or worm fat based on dry weight. The protein has a pepsin digestibility of at least 50%. The resulting nutrient streams can be used in food, petfood, feed and pharmaceutical industry.
1. A method to convert insects or worms into nutrient streams, comprising the steps of:
(a) obtaining a pulp from insects or worms, wherein the insects or worms are reduced in size;
(b) heating the pulp to a temperature of 70-100° C., thereby assuring that a majority of fats contained in the pulp are liquefied; and
(c) subjecting the heated pulp to a physical separation step to obtain a first nutrient stream comprising a fat fraction, a second nutrient stream comprising an aqueous protein fraction, and a third nutrient stream comprising a solid-containing fraction,
wherein the method does not comprise enzymatic treatment of the pulp of steps (a), (b), and (c) and does not comprise addition of reagents or chemicals to the pulp of steps (a), (b), and (c).
2. The method according to claim 1 , wherein the insects are insect larvae.
3. The method according to claim 1 , wherein the insects or worms are selected from the group consisting of house flies, soldier flies, morio worms, mealworms, and crickets.
4. The method according to claim 1 , wherein the method is a continuous method.
5. The method according to claim 1 , wherein the physical separation comprises decanting and/or centrifugation.
6. The method according to claim 1 , wherein the aqueous protein fraction and the solid-containing fraction are combined and dried together after step (c).
7. The method according to claim 1 , wherein the aqueous protein fraction and the solid-containing fraction are separately dried after step (c).
8. The method according to claim 7 , wherein the aqueous protein fraction is spray-dried.
9. The method according to claim 7 , wherein the solid-containing fraction is air-dried.
10. The method according to claim 1 , wherein the insects or worms in the pulp are reduced to a particle size of less than 1 mm prior to step b.