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Potential prebiotic activity of Tenebrio molitor insect flour using an optimized in vitro gut microbiota model


The Tenebrio molitor insect flour (TMIF) is considered a nutritive food ingredient, but its impact at the gut microbiota level and its potential prebiotic activity still need be assessed. For such studies, an in vitro simulation model of gut microbiota was optimized. Pure cultures of Lactobacillus and Bifidobacterium strains in monocultures and co-cultures (pairs and consortium) were used on this model to evaluate the effect of TMIF on the viability and metabolic activity of those bacteria. The optimization of the in vitro model of the gut microbiota was successful, and growth of the most important groups of bacteria in the gut microbiota was observed. As so this model can be used to study the effects of other ingredients at that level. It also enabled to pinpoint prebiotic effects of the studied TMIF suggesting possible symbiotic interactions. Additionally, the direct effect of the TMIF on bacterial cells, when in nutritive stress was also evaluated. In terms of TMIF effects on probiotic bacteria viability and growth, no negative effects were observed, and even an enhancement of growth and an increase of production of short chain fatty acids (SCFA) and lactate, in most of the cases, was observed. Also, this study showed that TMIF help maintaining the viability of bacteria during incubation time when these are under nutritional stress conditions. A potential prebiotic effect of TMIF is then predictable with this study, opening a path to new researches on this subject.

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Supplementary files

Publication details

The article was received on 30 Jul 2018, accepted on 13 Apr 2019 and first published on 18 Apr 2019

Article type: Paper
DOI: 10.1039/C8FO01536H
Food Funct., 2019, Accepted Manuscript

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    Potential prebiotic activity of Tenebrio molitor insect flour using an optimized in vitro gut microbiota model

    N. M. D. Carvalho, F. Teixeira, S. Silva, A. R. Madureira and M. Pintado, Food Funct., 2019, Accepted Manuscript , DOI: 10.1039/C8FO01536H

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