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

Campbell, Mairead; Ortu�o, Jordi; Stratakos, Alexandros Ch.; Linton, Mark; Corcionivoschi, Nicolae; Elliott, Tara; Koidis, Anastasios; Theodoridou, Katerina

Authors

Mairead Campbell

Jordi Ortu�o

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Alexandros Stratakos Alexandros.Stratakos@uwe.ac.uk
Associate Professor in Sustainable Agri-Food Production

Mark Linton

Nicolae Corcionivoschi

Tara Elliott

Anastasios Koidis

Katerina Theodoridou



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 (90◦C 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 90◦C 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.

Citation

Campbell, M., Ortuño, J., Stratakos, A. C., Linton, M., Corcionivoschi, N., Elliott, T., …Theodoridou, K. (2020). Impact of thermal and high-pressure treatments on the microbiological quality and in vitro digestibility of black soldier fly (Hermetia illucens) larvae. Animals, 10(4), Article 682. https://doi.org/10.3390/ani10040682

Journal Article Type Article
Acceptance Date Apr 11, 2020
Online Publication Date Apr 14, 2020
Publication Date Apr 14, 2020
Deposit Date Jun 26, 2021
Publicly Available Date Mar 28, 2024
Journal Animals
Electronic ISSN 2076-2615
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 10
Issue 4
Article Number 682
DOI https://doi.org/10.3390/ani10040682
Public URL https://uwe-repository.worktribe.com/output/7450749

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