Biofumigant Composition for Stored Grain Pest Control
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Solution Overview
Problem
There is an urgent need for a potent, biodegradable pesticide or insecticidal composition of natural origin that can effectively control stored grain insect pests without causing environmental harm or health hazards, as existing chemical fumigants like phosphine and methyl bromide are ineffective and banned due to ozone depletion and health concerns.
Innovation Solution
A biofumigant composition comprising isosecotanapartholide (90-95%) derived from Artemisia vulgaris and lemon grass oil (5-10%) is developed, which is applied using carbon dioxide or nitrogen as a carrier, and prepared through a process involving drying, solvent extraction, chromatography, and high-performance liquid chromatography to achieve high insecticidal activity against stored grain pests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical fumigants like phosphine and methyl bromide are used, then strong insecticidal activity is achieved, but environmental harm and health hazards occur
Solution Approach 1:
The patent changes the chemical composition parameters by formulating a biofumigant containing allyl isothiocyanate (5-20%), diethyl carbonate (70-85%), and water (5-15%), replacing traditional chemical fumigants with a natural plant-derived active ingredient combined with safe carriers, thereby maintaining efficacy while eliminating environmental and health hazards
Solution Approach 2:
The patent creates a composite fumigant formulation by combining allyl isothiocyanate (the active biofumigant ingredient) with diethyl carbonate (a safe carrier and co-fumigant) and water, forming a synergistic composite material that achieves both high insecticidal activity and environmental safety
2Object-affected harmful factors
If natural plant extracts are used, then eco-friendliness is improved, but insecticidal activity may be insufficient
Solution Approach 1:
The patent optimizes the concentration parameters of allyl isothiocyanate (5-20%) in the formulation to achieve sufficient insecticidal activity, and adjusts the ratio of diethyl carbonate (70-85%) to enhance the fumigant effect, thereby maintaining both eco-friendliness and reliable pest control
Solution Approach 2:
The patent uses diethyl carbonate as an intermediary substance that enhances and prolongs the fumigant action of allyl isothiocyanate, allowing the natural plant extract to achieve sufficient insecticidal activity through synergistic interaction with the carrier compound
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The biofumigant composition exhibits strong insecticidal activity against pests like Sitophilus oryzae, Tribolium castaneum, and Corcyra cephalonica with LC50 values of 2.4-2.9 μg/L, while being eco-friendly and safe for seed germination and plant growth, offering a sustainable alternative to chemical fumigants.
Implementation Method 1
evaporating the organic solvent extract under vacuum evaporator
Implementation Method 2
evaporating the organic solvent extract under vacuum evaporator
Implementation Method 3
subjecting it to silica gel column chromatography followed by eluting with polar solvents to obtain active insecticidal active fraction
Implementation Method 4
further purifying by flash chromatography followed by preparative high performance liquid chromatography (HPLC) to obtain purified fraction
Data Source
AI summary
The present invention relates to a composition having strong insecticidal activity and a process of preparation thereof. More particularly, the present invention relates to a novel biofumigant composition and a process for the preparation of a biofumigant. The biofumigant composition is eco-friendly, biodegradable. Further, the biofumigant composition is effective against stored product insects such as Sitophilus oryzae, Corcyra cephalonica and Tribolium castaneum. Moreover, since the biofumigant does not result in any adverse effect on the seed germination and growth of plant, therefore the composition is found to be highly desirable for grain protection against stored-product insect pests.