Food Safety of Consuming Black Soldier Fly () Larvae: Microbial, Heavy Metal and Cross-Reactive Allergen Risks.

Leah W Bessa, Elsje Pieterse, Jeannine Marais, Karim Dhanani, Louwrens C Hoffman
Author Information
  1. Leah W Bessa: Department of Animal Sciences, University of Stellenbosch, Stellenbosch 7600, South Africa. ORCID
  2. Elsje Pieterse: Department of Animal Sciences, University of Stellenbosch, Stellenbosch 7600, South Africa.
  3. Jeannine Marais: Department of Food Science, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa. ORCID
  4. Karim Dhanani: The Woodmill Office 11, 1st Floor, Vredenburg Road, Stellenbosch 7602, South Africa.
  5. Louwrens C Hoffman: Department of Animal Sciences, University of Stellenbosch, Stellenbosch 7600, South Africa. ORCID

Abstract

Black soldier fly () larvae (BSFL) are a promising, sustainable source of nutrients, however, there is limited knowledge regarding the food safety of consuming BSFL. This study determined the safety of consuming BSFL for direct human consumption in terms of microbial, heavy metal and allergen content. Microbial counts were determined using ISO (International Organization for Standardization) methods, heavy metals were determined using inductively coupled plasma mass spectrometry and allergens were determined via Orbitrap mass spectrometry and ELISA (enzyme-linked immunosorbent assay) kits. Feed and killing method influenced the presence of ( = 0.011), and only the killing method influenced ( < 0.00) and total viable count (TVC) ( < 0.00). Blanching resulted in a 3-log reduction in and a 3.4 log reduction in the TVC counts. spp. and spp. were not detected in the BSFL samples. Heavy metals were detected although they were below maximum legal limits. Cross-reactive allergens, tropomyosin and arginine kinase, were detected in the BSFL samples, although the clinical significance requires research. The feed fed to the BSFL and blanching were found to influence the safety of consuming BSFL, highlighting the importance of incorporating sufficient decontamination steps, such as blanching, to ensure food safety.

Keywords

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Grants

  1. 84633/South African Research Chairs Initiative

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