In the first period of the project, several species of microalgae (Haemoatococcus pluvialis, Euglena gracilis, Euglena gracilis var. Saccharophila and Schizochytrium limacinum), bacteria (Methylorubrum extorquens and Methylophilus methylotrophus), fungal (Aspergillus orizae, Aspergillus sojae and Rhizopus microsporus var. oligosporus) and insect (Hermetia illucens and
Tenebrio molitor) has been screened to produce rich-protein biomass.
Several culture and growth conditions have been tested to increase the protein content of SCP and insect biomass at the laboratory scale. Regarding protein recovery from biomass, three-phase partitioning (TPP), ultrasound-assisted extraction (UAE), accelerated solvent extraction (ASE), shear forces (rotor-stator system Ultra-Turrax) (UT), and natural deep eutectic solvents (NADES) have all been examined. So far, the best results have been obtained with UAE and UT. To date, the protein extraction yield has increased to close to or more than 20% with UAE and UT for microalgae and fungal biomass. The protein content and profile of amino acids have been characterised. The protein content is now reaching the KPIs set in the project. All the alternative sources considered in the InnoProtein project have content of all 20 amino acids. The toxicological analysis of fungal biomass has been carried out.
Regarding the optimisation of the SCP and insect protein processes from a sustainable point of view, several raw materials based on food by-products (e.g. biscuit flour, biscuit crumbs, brewer's yeast, Lactum-Feed B, Lactal, molasses and liquid food) has been characterised. Their viability as co-substract has begun for insect and fungal growth testing.
The residual biomass and streams from protein recovery processes have been characterised (e.g. oil, frass, etc.). Additionally, the valorisation of biomass residues through the production of bioplastics, employing advanced processes such as compounding to create cutlery products, has started. The formulation of a new foliar biostimulant prototype based on chitosan obtained in the project has started. The nutrient analysis of frass confirmed its suitability in terms of NPK content, making it appropriate for use, later in the project, in tests to evaluate its agronomic efficacy as a solid biofertilizer.
The US-based methodology for monitoring culture growth has completed the design of the sensing topology and the ultrasonic configuration. The specifications of the final transducer holder are already defined. Work is also underway on the electronic prototype that will facilitate the digitalisation of ultrasonic signals. The main components have already been selected, and the design of the electronic board is advancing well.
Progress has also been made satisfactorily on the software that will serve as a tool for the end user. Methods and possible digital architecture applied to the project conditions have been analysed to define the software requirements, and technology partners have been asked essential questions necessary to advance in developing the digital solution.