Curcuma Rhizome Extract Purification for Powdery Mildew Control
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Solution Overview
Problem
Conventional chemical pesticides for controlling plant powdery mildew lead to pathogen resistance, environmental pollution, and health risks, necessitating the development of a more sustainable and effective alternative.
Innovation Solution
A method involving the preparation of Curcuma Longa rhizome extract through drying, ethanol extraction, further solvent extraction, and molecular distillation, resulting in a pale yellow, flowable liquid with a ginger-like aroma, suitable for industrial production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synthetic chemical pesticides are used to control powdery mildew, then the prevention and control effect is improved, but pathogen resistance develops and environmental pollution increases
Solution Approach 1:
The patent extracts the active components from Curcuma longa rhizome through a multi-step process involving ethanol extraction, concentration, and solvent extraction. This natural extract is then used as a fungicide alternative to synthetic chemicals, thereby eliminating the harmful effects of chemical pesticides while maintaining disease control effectiveness.
Solution Approach 2:
The patent optimizes the extraction parameters including ethanol concentration (60-80%), extraction temperature (40-60°C), and extraction time (2-4 hours) to maximize the yield and efficacy of the active components. The molecular distillation process further refines the extract by controlling temperature and pressure parameters to separate and concentrate the antifungal compounds.
2Manufacturing precision
If molecular distillation is used to remove turmeric oleoresin, then the purity of the extract is improved, but the processing time and energy consumption increase
Solution Approach 1:
The patent utilizes molecular distillation, which exploits differences in the volatility and vapor pressure of components at reduced pressure. By operating at low pressure (0.1-10 mmHg) and controlled temperature (80-120°C), the turmeric oleoresin components vaporize and separate from the desired extract components, achieving high purity without requiring excessive energy or time.
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 Curcuma Longa rhizome extract effectively prevents and treats powdery mildew in Leguminosae, Rosaceae, and Vitaceae plants, degrades rapidly in the environment without causing environmental pollution, and demonstrates low toxicity to birds, honeybees, and silkworms, and other organisms in the application environments.
Implementation Method 1
The Curcuma Longa rhizome extract effectively prevents and treats powdery mildew in Leguminosae, Rosaceae, and Vitaceae plants
Implementation Method 2
degrades rapidly in the environment without causing environmental pollution
Data Source
AI summary
The present application relates to a method for preparing a Curcumae longae rhizoma extract, a product thereof and the use thereof in the prevention and control of plant powdery mildew. The preparation method comprises: drying and pulverizing Curcumae longae rhizoma raw materials, then extracting same with an ethanol aqueous solution to obtain an extract liquid; concentrating the extract liquid, and extracting same with an organic solvent to obtain an aqueous-phase product and an oil-phase product; and performing molecular distillation on the oil-phase product to remove Curcumae longae rhizoma oleoresin and obtain the product. The Curcumae longae rhizoma extract prepared in the present application has excellent effects in preventing and controlling plant powdery mildew, has the advantages of being safe, low toxicity, rapid biodegradability, not easily developing drug resistance and being conducive to sustainable development, stable physical and chemical properties, a long storage period and low toxicity to terrestrial organisms, and has good economic and ecological benefits.