Ionic liquids based stored product insect antifeedants

Abstract

Ionic liquids are effective stored product insect antifeedants. Their activity depends on the type of cation and anion. A group of ionic liquids with inorganic (nitrate, nitrite, hydrogen sulphite, dihydrogen phosphate, thiocyanate, phosphate and tripolyphosphate) and organic (propionate, citrate, sorbate, undecylate, dodecylbenzenesulfonate, acesulfamate and saccharinate) anions was synthesized. Their physicochemical properties, microbial and deterrent activity against Tribolium confusum (larvae and beetles), Sitophilus granarius (beetles) and Trogoderma granarium (larvae) were determined. Ionic liquids with a didecyldimethylammonium cation demonstrated deterrent activity, exceeding the activity of the standard, azadirachtin. The compounds proved to be very effective against pathogenic bacteria and fungi. The appropriate selection of the cation and anion allows the design of economic and effective insect antifeedants. Ionic liquids based insect antifeedants provide novel examples of promising management tools in biorational approaches to stored product pest control.

Dicationic ionic liquids as new feeding deterrents

“…The aim of this study was the synthesis of a new compound with antifeedant activity and containing gemini surfactant as a cation. As per the literature data, compounds having one long alkyl chain exhibited better biological properties than compounds with a short alkyl chain (Pernak et al 2013 ). Compounds with a low toxicity (artificial sweeteners and natural acids) were used as a counterion.…”

“…These are mainly compounds containing ammonium cations such as didecyldimethylammonium. The presence of long alkyl chains determines the high activity of ionic liquids in relation to different types of beetles and pest larvae (Pernak et al 2013 ).…”

Third-generation ionic liquids with N-alkylated 1,4-diazabicyclo[2.2.2]octane cations and pelargonate anions

“…3 Third-generation ILs are characterized by their biological activity, such as bactericidal, 4,5 bacteriostatic, 6 fungicidal, 7 herbicidal 8,9 or deterrent. 10,11 Their biological activity is usually associated with the anion, while the cation is designed to increase their application potential.…”

“…Obtaining natural deterrent agents is highly expensive, leading to the search for synthetic replacements. Sweet ILs that possess deterrent properties include anions such as saccharinate, 10 cyclamate 24 or acesulfame. 25 Deterrent ILs with a pelargonate anion have also been reported.…”

Synthesis, Surface Properties and Biological Activity of Long Chain Ammonium Herbicidal Ionic Liquids

“…Nowadays, there is an extensive list of literature reports regarding successive applications of already known ILs. Additionally, new possible applications were also discovered since ILs with pharmaceuticals, 6 antifeedants 7,8 or fungicidal activity were recently introduced. 8,9 Modern agriculture depends on effective control of pests and weeds.…”