Sunflower seed hulls waste as a novel source of insecticidal product: Pyrolysis bio-oil bioactivity on insect pests of stored grains and products

URRUTIA, RODRIGO IÑAKI; YEGUERMAN, CRISTHIAN; JESSER, EMILIANO; GUTIERREZ, VICTORIA SOLEDAD; VOLPE, MARIA ALICIA; WERDIN GONZÁLEZ, JORGE OMAR

JOURNAL OF CLEANER PRODUCTION

ELSEVIER SCI LTD

Año: 2020

0959-6526

The edible oil industry produces abundant sunflower seed hulls (SSH) as waste.Pyrolysis offers a sustainable method for producing high-value bioproducts from thislignocellulosic residue. This paper reports on the bioefficacy of SHH pyrolysis bio-oilsfrom raw SSH (named SSH bio-oil) and acid pretreated hulls (named PTH bio-oil) asbioinsecticides against Sitophilus oryzae, Lasioderma serricorne and Triboliumcastaneum. Raw SSH and pretreated hulls with 10% H3PO4 were subjected to fastpyrolysis in a vertical reactor at 450 °C. Results show that PTH bio-oil is a furfuralenriched bio-liquid with storage stability and a yield of 33%. This bio-oil is suitable forevaluating biological activity on insect pests, since SSH bio-oil produces high variabilityin mortality data. Contact toxicity bioassays indicate that PTH bio-oil produces highinsecticidal activity in S. oryzae (LC50= 0.51 mg cm-2), followed by L. serricorne andT. castaneum. In behavioral assays, this bio-oil shows a slight repellent effect andinsect pest mobility reduction. Moreover, PTH bio-oil affects the nutritional physiologyof S. oryzae and T. castaneum producing a modification of nutritional indices andantifeedant effects. Our study provides information on the potential of fast pyrolysis biooils from SSH waste to develop novel bioinsecticides as an alternative to the use ofconventional synthetic pesticides.