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Maintaining Laboratory Cultures of Gryllus bimaculatus, a Versatile Orthopteran Model for Insect Agriculture and Invertebrate Physiology

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Evaluating an emerging technology-based biorefinery for edible house crickets.

Marios Psarianos¹, Shikha Ojha¹, Oliver K Schlüter^1,2

¹Horticultural Engineering, Leibniz Institute for Agricultural Engineering and Bioeconomy (ATB), Potsdam, Germany.

Frontiers in Nutrition

|August 3, 2023

Summary

House cricket biomass can be efficiently refined into protein and chitin fractions using a novel biorefinery approach. This method offers a sustainable way to valorize edible insects for future food systems.

Keywords:

deep eutectic solvent extraction fractionation high pressure resilient food processing ultrasound

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Area of Science:

Food Science
Biotechnology
Sustainable Agriculture

Background:

Edible insects, particularly house crickets, are recognized for their nutritional value and low environmental impact.
Insect biomass contains proteins, lipids, chitin, and phenolics, presenting opportunities for valorization.
Advanced processing technologies and green solvents are crucial for efficient insect biomass utilization.

Purpose of the Study:

To develop an efficient biorefinery process for house cricket biomass valorization.
To isolate valuable fractions such as fats, phenolics, proteins, and chitin.
To evaluate the impact of high pressure (HP) and ultrasound (US) processing on extraction yields and quality.

Main Methods:

A biorefinery system was employed using a hexane/methanol/water solvent for initial separation of fat, phenolics, and a protein-chitin solid fraction.
High pressure (HP) and ultrasound (US) treatments were applied during the initial solvent extraction.
A deep eutectic solvent (betaine and urea, B/U) was subsequently used for protein and chitin isolation.

Main Results:

Lipid extraction yielded a maximum of 15%, with no significant improvement from HP or US treatments.
Ultrasound (US) processing increased phenolic extraction yield by 38.69%; HP processing negatively impacted antioxidant capacity.
The B/U solvent effectively separated proteins (≥80% content) and chitin (≥70% content).

Conclusions:

House cricket biomass can be rapidly and simply refined into high-value protein and chitin fractions.
The developed method is industrially relevant for the sustainable valorization of insect resources.
This approach contributes to the utilization of edible insects in future food systems.