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Main Title: Dietary zinc enrichment reduces the cadmium burden of mealworm beetle (Tenebrio molitor) larvae
Author(s): Keil, Claudia
Maares, Maria
Kröncke, Nina
Benning, Rainer
Haase, Hajo
Type: Article
Abstract: The industrial production of Tenebrio molitor L. requires optimized rearing and processing conditions to generate insect biomass with high nutritional value in large quantities. One of the problems arising from processing is a tremendous loss in mineral accessibility, affecting, amongst others, the essential trace element Zn. As a feasible strategy this study investigates Zn-enrichment of mealworms during rearing to meet the nutritional requirements for humans and animals. Following feeding ZnSO 4 -spiked wheat bran substrates late instar mealworm larvae were evaluated for essential micronutrients and human/animal toxic elements. In addition, growth rate and viability were assessed to select optimal conditions for future mass-rearing. Zn-feeding dose-dependently raised the total Zn content, yet the Zn larvae /Zn wheat bran ratio decreased inversely related to its concentration, indicating an active Zn homeostasis within the mealworms. The Cu status remained stable, suggesting that, in contrast to mammals, the intestinal Cu absorption in mealworm larvae is not affected by Zn. Zn biofortification led to a moderate Fe and Mn reduction in mealworms, a problem that certainly can be overcome by Fe/Mn co-supplementation during rearing. Most importantly, Zn feeding massively reduced the levels of the human/animal toxicant Cd within the mealworm larvae, a technological novelty of outstanding importance to be implemented in the future production process to ensure the consumer safety of this edible insect species.
Subject(s): nutrition
nutritional supplements
Tenebrio molitor
Issue Date: 18-Nov-2020
Date Available: 12-Mar-2021
Language Code: en
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Sponsor/Funder: TU Berlin, Open-Access-Mittel – 2020
Journal Title: Scientific Reports
Publisher: SpringerNature
Volume: 10
Issue: 1
Article Number: 20033
Publisher DOI: 10.1038/s41598-020-77079-x
EISSN: 2045-2322
TU Affiliation(s): Fak. 3 Prozesswissenschaften » Inst. Lebensmitteltechnologie und Lebensmittelchemie » FG Lebensmittelchemie und Toxikologie
Appears in Collections:Technische Universität Berlin » Publications

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