From waste to food and bioinsecticides: An innovative system integrating Tenebrio molitor bioconversion and pyrolysis bio-oil production.

Autor: Urrutia RI; Instituto de Ciencias Biológicas y Biomédicas del Sur, INBIOSUR (CONICET-UNS), San Juan 671, 8000, Bahía Blanca, Argentina., Jesser EN; Instituto de Química del Sur, INQUISUR (CONICET-UNS), Av. Alem 1253, 8000, Bahía Blanca, Argentina; Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur (UNS), San Juan 670, 8000, Bahía Blanca, Argentina., Gutierrez VS; Instituto de Química del Sur, INQUISUR (CONICET-UNS), Av. Alem 1253, 8000, Bahía Blanca, Argentina; Departamento de Química, Universidad Nacional del Sur (UNS), Av. Alem 1253, 8000, Bahía Blanca, Argentina., Rodriguez S; Instituto de Química del Sur, INQUISUR (CONICET-UNS), Av. Alem 1253, 8000, Bahía Blanca, Argentina; Departamento de Química, Universidad Nacional del Sur (UNS), Av. Alem 1253, 8000, Bahía Blanca, Argentina., Gumilar F; Instituto de Ciencias Biológicas y Biomédicas del Sur, INBIOSUR (CONICET-UNS), San Juan 671, 8000, Bahía Blanca, Argentina; Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur (UNS), San Juan 670, 8000, Bahía Blanca, Argentina., Murray AP; Instituto de Química del Sur, INQUISUR (CONICET-UNS), Av. Alem 1253, 8000, Bahía Blanca, Argentina; Departamento de Química, Universidad Nacional del Sur (UNS), Av. Alem 1253, 8000, Bahía Blanca, Argentina., Volpe MA; Departamento de Química, Universidad Nacional del Sur (UNS), Av. Alem 1253, 8000, Bahía Blanca, Argentina., Werdin-González JO; Instituto de Ciencias Biológicas y Biomédicas del Sur, INBIOSUR (CONICET-UNS), San Juan 671, 8000, Bahía Blanca, Argentina; Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur (UNS), San Juan 670, 8000, Bahía Blanca, Argentina. Electronic address: jwerdin@hotmail.com.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2023 Nov; Vol. 340, pp. 139847. Date of Electronic Publication: 2023 Aug 16.
DOI: 10.1016/j.chemosphere.2023.139847
Abstrakt: To achieve a waste-free clean production, the present study aimed to valorize an underused agroindustrial byproduct (rice bran) by mealworms bioconversion and produce bio-oil from pyrolysis of insect excreta (frass) as bioinsecticide. To reach the first goal, the suitability of rice bran (RB) versus standard diet, wheat bran (WB), was examined by determining feed conversion, growth performance, and nutritional profile of T. molitor larvae. RB diet was an appropriate feed substrate for breeding mealworms, as evidenced by their high survival rates, optimal feed conversion parameters, and its capability to support the growth and life cycle of this insect. Besides, RB did not affect soluble larval protein content but modified crude fat content and fatty acid profile. In order to address the second aim, egested frass from RB and WB were subjected to pyrolysis to obtain bio-oils. The main compound was acetic acid (≈37%) followed by 1,6-anhydro-β-d-glucopyranose (from 16 to 25%), as measured by GC-MS analysis. Nitrogen-containing chemicals accounted for ≈10%. Frass bio-oils could represent a novel source of bioinsecticides due to their bioeffectiveness in insect pests of economic importance (Plodia interpunctella and Tribolium castaneum) and medical interest (Culex pipiens pipiens). For P. interpunctella adults, frass bio-oils produced insecticidal activity by fumigant and contact exposure whereas for T. castaneum adults, just fumigant. By a miniaturized model that simulates semireal storage conditions, it was seen that, on T. castaneum, frass RB bio-oil generated higher repellent effect than frass WB. Finally, bio-oils proved to have larvicidal activity against Cx. p. pipiens.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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