Impact of thermal and high-pressure treatments on the microbiological quality and in vitro digestibility of black soldier fly (Hermetia illucens) larvae

Mairead Campbell, Jordi Ortuño, Alexandros Ch Stratakos, Mark Linton, Nicolae Corcionivoschi, Tara Elliot, Anastasios Koidis, Katerina Theodoridou*

*Corresponding author for this work

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Abstract

Black soldier fly larvae (BSFL) are gaining importance in animal feeding due to their ability to upcycle low-value agroindustry by-products into high-protein biomass. The present study evaluated the nutritional composition of BSFL reared on brewer’s by-product (BBP) and the impact of thermal (90C for 10/15 min) and high-pressure processing (HPP; 400/600MPa for 1.5/10 min) treatments on the microbial levels and in vitro digestibility in both ruminant and monogastric models. BBP-reared BSFL contained a high level of protein, amino acids, lauric acid, and calcium, and high counts of total viable counts (TVC; 7.97), Enterobacteriaceae (7.65), lactic acid bacteria (LAB; 6.50), and yeasts and moulds (YM; 5.07). Thermal processing was more effective (p < 0.05) than any of the HPP treatments in reducing TVC. Both temperature of 90C and pressure of 600 MPa reduced the levels of Enterobacteriaceae, LAB, and YM below the detection limit. In contrast, the application of the 400 MPa showed a reduced inactivation (p < 0.05) potential. Heat-treated samples did not result in any significant changes (p > 0.05) on any of the in vitro digestibility models, whereas HPP showed increased and decreased ruminal and monogastric digestibility, respectively. HPP did not seem to be a suitable, cost-effective method as an alternative to heat-processing for the large-scale treatment of BSFL.

Original languageEnglish
Article number682
Number of pages10
JournalAnimals
Volume10
Issue number4
DOIs
Publication statusPublished - 14 Apr 2020

Keywords

  • Animal feed
  • Black soldier fly
  • High-pressure processing
  • In vitro digestibility
  • Insects
  • Microbial safety

ASJC Scopus subject areas

  • Animal Science and Zoology
  • veterinary(all)

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