Aromatic Amide Insect Repellents for Crop Protection
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Solution Overview
Problem
Current insect repellents, such as DEET, are toxic to humans and beneficial insects, have short effectiveness, and are not adequately effective against Spotted Wing Drosophila (SWD), a major fruit pest causing significant crop losses.
Innovation Solution
Development of structurally modified aromatic amide compounds that act as repellents, which are safer, more effective, and longer-lasting than DEET, specifically designed to deter fruit flies like SWD without harming humans or beneficial insects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DEET is used as an insect repellent, then fruit flies are repelled, but toxicity to humans and beneficial insects increases
Solution Approach 1:
The patent modifies the chemical structure of DEET by changing parameters such as the aromatic ring substitution patterns (ortho, meta, para positions) and the alkyl chain lengths attached to the amide nitrogen. These structural parameter changes result in new compounds with reduced toxicity while maintaining repellent effectiveness against fruit flies
Solution Approach 2:
The patent creates composite chemical structures by combining different aromatic substitution patterns with various alkyl chain configurations. This composite approach allows optimization of both repellent activity and safety profile by integrating multiple structural elements that work synergistically
2Reliability
If DEET is used as an insect repellent, then fruit flies are repelled, but duration of effectiveness is short
Solution Approach 1:
The patent extends the duration of effectiveness by modifying the alkyl chain parameters in the amide structure. Longer alkyl chains (e.g., propyl, butyl, pentyl instead of ethyl) increase the persistence and duration of repellent activity on treated surfaces, while the aromatic substitution patterns maintain high repellent efficacy throughout the extended period
3Reliability
If DEET is used as an insect repellent, then fruit flies are repelled, but habituation occurs
Solution Approach 1:
The patent introduces asymmetry in the chemical structure through specific ortho-substitution patterns on the aromatic ring and asymmetric alkyl chain configurations. This structural asymmetry prevents insect habituation by creating a more complex and less predictable molecular profile that insects cannot easily adapt to or tolerate
Solution Approach 2:
The patent modifies the chemical parameters by varying the positions of aromatic substituents (ortho, meta, para) and the lengths of alkyl chains, creating a series of compounds with different molecular profiles. This parameter diversity ensures that insects do not develop habituation to any single compound, maintaining repellent effectiveness over time
4Reliability
If DEET is used as an insect repellent, then fruit flies are repelled, but cost increases
Solution Approach 1:
The patent reduces manufacturing costs by optimizing the synthesis approach for DEET analogs. By using standard amide coupling reactions and common aromatic building blocks, the patent enables economical production of multiple DEET analogs with improved performance, making the enhanced repellents cost-effective compared to maintaining DEET formulations
Solution Approach 2:
The patent develops a universal synthetic methodology that can produce multiple DEET analogs with different aromatic substitutions and alkyl chains using similar reaction protocols. This multi-functionality allows a single manufacturing platform to produce various optimized compounds, reducing overall production costs through process efficiency
5Reliability
If DEET is used as an insect repellent, then fruit flies are repelled, but dissolves plastics
Solution Approach 1:
The patent modifies the chemical parameters of DEET by introducing aromatic rings with electron-withdrawing groups (nitro, cyano, carbonyl) that reduce the overall polarity and plastic-dissolving capability. These parameter changes maintain the repellent effectiveness while significantly reducing the harmful effect of plastic dissolution, making the compound more environmentally compatible
Data Source
AI summary
Methods of protecting fruit crops from flying insect pests and of repelling flying insects using aromatic amide compounds are disclosed. The methods apply the compounds to various surfaces, such as the fruit crops, the ground or structures adjacent to the fruit crops, or an object, article, human skin or animal. The compounds have the formula RxC6Hy—C(═O)—N(Cy), where RxC6Hy is a substituted phenyl group, each R group is independently C1-C6 alkyl, substituted C1-C4 alkyl, (substituted) C6-C10 aryl, C1-C4 alkoxy, C6-C10 aryloxy, halogen, nitro, cyano, cyanate, isocyanate, nitroso, C1-C4 alkylthio, phenylthio, (halogen-substituted) C1-C4 alkylsulfonyl, phenylsulfonyl, tolylsulfonyl, amino, mono- or di-C1-C4 alkylamino, diphenylamino, di-C1-C4 alkylamido, formyl, C2-C7 acyl, or C1-C6 alkoxycarbonyl; x is an integer of 1 to 5; x+y=5; Cy is a C2-C8 (substituted) alkadiyl, a C4-C6 (substituted) alkenediyl, or a (substituted) diyl of the formula —(CH2CH2)—O—(CH2CH2)—, —(CH2CH2)—NR′—(CH2CH2)— or —(CH2CH2)—S—(CH2CH2)— that, along with the amide N atom, forms a non-aromatic cyclic group; and R′ is C1-C6 alkyl, substituted C1-C4 alkyl, (substituted) C6-C10 aryl, or (substituted) benzyl.