YEGUERMAN Cristhian Alan
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
The edible oil industry produces abundant sunflower seed hulls (SSH) as waste. Pyrolysis offers a sustainablemethod for producing high-value bioproducts from this lignocellulosic residue. This paper reports on the bioefficacyof SHH pyrolysis bio-oils from raw SSH (named SSH bio-oil) and acid pretreated hulls (named PTH bio-oil)as bioinsecticides against Sitophilus oryzae, Lasioderma serricorne and Tribolium castaneum. Raw SSH and pretreatedhulls with 10% H3PO4 were subjected to fast pyrolysis in a vertical reactor at 450 °C. Results show that PTHbio-oil is a furfural enriched bio-liquid with storage stability and a yield of 33%. SSH bio-oil was unsuitable forevaluating biological activity since it produce high variability in mortality data. In contrast, PTH bio-oil produceshigh insecticidal activity in S. oryzae (LC50 = 0.51 mg cm−2) by contact toxicity bioassay, followed by L. serricorneand T. castaneum. In behavioral assays, PTH bio-oil shows a slight repellent effect and mobility reduction.Moreover, PTH bio-oil affects the nutritional physiology of S. oryzae and T. castaneum producing a modificationof nutritional indices and antifeedant effects. Our study provides information on the potential of fast pyrolysisbio-oils from SSH waste to develop novel bioinsecticides as an alternative to the use of conventional syntheticpesticides.