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Fatty acid profile

The BSF fatty acid profile is also variable depending on the development stage. It contains primarily saturated fatty acid allowing it to tolerate a wide temperature range, as shown in Table 1.2. Indeed, because the BSF cannot regulate its body temperature and must survive at temperatures up to 40 °C, a high concentration of lauric acid allows it to reduce the fluidity of the membrane and its oxidation. Moreover, the composition of the BSF lipid also depends on the feeding substrate. Indeed, it is possible to increase the proportion of valuable unsaturated fatty acid to 37% of the lipid content by feeding the larvae a diet containing fish meal inclusions a few hours before killing them. However, unsaturated fatty acids are vulnerable to oxidation, reducing their nutritional value if not inhibited. It is therefore essential to maintain the quality of the fatty acids by preventing their oxidation.

Table 1.2 Fatty acid profile of the black soldier fly larvae and prepupae.

Fatty acid (% lipid) Larvae Prepupae
Lauric (C12 :0) 29 – 61 44 – 73
Myristic (C14 :0) 7 – 10 7 – 10
Palmitic (C16 :0) 8 – 17 6 – 10
Palmitoleic (C16 :1n-7) 3 – 7 1 – 8
Stearic (C18 :0) 1 – 3 0 – 2
Oleic (C18 :1n-9) 8 – 18 3 – 8
Linoleic (C18 :2n-6) 4 – 17 5 – 12
Alpha-Linolenic (C18 :3n-3) 0 – 2 0 – 1
Unsaturated fatty acid 18 – 37 10 – 24
Saturated fatty acid 53 – 80 63 – 91

 

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