Feasibility of polylactic acid and essential oil composite with insecticidal properties for prevention of Sitophilus oryzae and Oryzophilus surinamensis in Sorghum and Pearl millet.

Reshma Prabhakar, Patole and Jeevan Prasad, Reddy and Keshava Murthy, P. S. and Vivek Babu, C. S. (2024) Feasibility of polylactic acid and essential oil composite with insecticidal properties for prevention of Sitophilus oryzae and Oryzophilus surinamensis in Sorghum and Pearl millet. International Journal of Biological Macromolecules (2024), 281. p. 136190.

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Abstract

Current study provides insight on the feasibility of polylactic acid (PLA) integrated with (1:1 ratio) of essential oils belonging to Ocimum gratissimum (OG) and Mentha spicata (MS) for prevention of major stored insect pests (Sitophilus oryzae and Oryzophilus surinamensis) in Sorghum and Pearl millet. A combination of OG and MS essential oils (1:1) was incorporated into the PLA polymer matrix. Further, SPME analysis of synthesized PLA showed the presence of volatiles corresponding to carvone (6.44 %) and thymol (6.22 %). Synthesized PLA composites were tested against S. oryzae and O. surinamensis using Sorghum and Pearl millets, and insect mortality was equivalent to commercial super bags (CSB). The head space oxygen decreased significantly in CSB and slightly in PLA bags. Thickness of EO blended PLA composite was increased (99 μm), tensile strength (23.94 MPa), WVTR (1.42 g/m2. hr) analysis, significant folding ability, and swelling capacity (0.24 %) showed slight reduction in composite film. TGA showed good thermal stability (334˚C) and XRD displayed the increased crystallinity (38.35 %) in PLAOM films, SEM and FTIR analysis of the synthesized composite films revealed complete homogenization of EO and PLA matrix. In addition, SEM analysis of insects (control & treated) revealed less topology changes in the elytra. Biodegradability study confirmed the weight loss in PLA films. Hence, current approach of using composite EO's with PLA offers sustainable solution for prevention of infestation during storage of millets.

Item Type:	Article
Uncontrolled Keywords:	Ocimum gratissimum, Mentha spicata, Polylactic-acid
Subjects:	600 Technology > 03 Agriculture > 05 Insect/Pest Control 600 Technology > 08 Food technology > 21 Cereals > 05 Ragi (Finger Millet) 600 Technology > 08 Food technology > 21 Cereals > 06 Sorghum 600 Technology > 09 Industrial oils, fats, waxes, gases > 03 Essential oils
Divisions:	Food Packaging Technology Food Protectants and Infestation Control
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	06 Nov 2024 06:51
Last Modified:	06 Nov 2024 06:51
URI:	http://ir.cftri.res.in/id/eprint/18393

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