4 results about "Houttuynin" patented technology

This invention discloses a method for preparing sodium houttuynia cordata, comprising the following steps: adding sodium methoxide and toluene to a reaction vessel, heating, then slowly adding nonanone and ethyl formate, and after the addition is complete, reacting with a gradient cooling process, and post-processing to obtain an aqueous phase containing intermediate I; adding the aqueous phase containing intermediate I and toluene to the reaction vessel, stirring, cooling, and rapidly introducing liquid sulfur dioxide, continuously stirring and reacting at 0-10°C for 5-15 minutes, cooling, and filtering to obtain crude sodium houttuynia cordata. The preparation method of this invention directly introduces liquid sulfur dioxide during the sulfonation reaction, greatly shortening the process time, while achieving high product yield and purity, and requiring less sulfur dioxide. Furthermore, in the post-processing of sodium houttuynia cordata, adding toluene to the reaction solution beforehand can effectively transfer the generated impurities to the toluene; recrystallization using a 50 v / v% ethanol aqueous solution removes water-soluble and oil-soluble impurities while further reducing the risk of fire and explosion during centrifuge operation.

The invention discloses a herba houttuyniae extract and a preparation method thereof, and relates to the technical field of Chinese herbal medicine extraction. Comprising the following steps: by taking fresh houttuynia cordata leaves as a unique raw material, carrying out a directional enrichment process, and taking sodium houttuyfonate as a core effective component; the purity of sodium houttuyfonate is not less than 99%, and the extraction rate is not less than 98%; the raw materials are subjected to airflow superfine grinding treatment, and the particle size of the ground raw materials is 1-100 nm; the content of sodium houttuyfonate is reduced by less than or equal to 2% within 12 months of sealed storage of the extract at room temperature. The raw materials are subjected to superfine grinding, so that cells of the raw materials are completely broken, effective components can be fully released, and the extraction time is greatly shortened; the effective component houttuyfonate is adsorbed and eluted by an ion exchange column and then is subjected to a salt forming reaction to generate sodium houttuyfonate, so that the property stability and the purity of the product in the post-treatment process are improved; the whole extraction process is carried out at low temperature, so that the stability and absorptivity of the product are further improved.

The invention discloses a method for preventing and controlling prodenia litura nuclear polyhedrosis virus diseases, and belongs to the technical field of large-scale breeding of insects. The method aims at solving the problems that in the prior art, the chemical disinfection effect is limited, and the disease resistance of prodenia litura is difficult to improve. According to the technical scheme, the method mainly comprises the following steps: firstly, disinfecting prodenia litura eggs to reduce the initial virus load; secondly, an immunopotentiator is added into the basal feed, and the immunopotentiator is selected from sodium houttuyfonate, houttuynia cordata powder or a boiling soak solution prepared from houttuynia cordata roots, stems and leaves, so that the immunologic function of the prodenia litura is enhanced, and the resistance of the prodenia litura to nuclear polyhedrosis virus (NPV) is improved. Through verification, the survival rate of prodenia litura infected with NPV in large-scale feeding can be remarkably increased, and the method is easy and convenient to operate, low in cost and environmentally friendly.

The invention provides a repellent for regulating and controlling animal chemical perception receptors and application of the repellent in green prevention and control, and belongs to the technical field of agriculture and biological medicine. The invention provides an application of sodium houttuyfonate in preparation of an animal repellent. An electrophysiology experiment shows that SH can activate TRPA1 receptors of various species including nematodes and herbivores and initiate behavior response of animals to external stimulation. A behavioral experiment shows that the SH treatment can induce agricultural pests and herbivores to generate avoidance behaviors, reduce the harm of the agricultural pests and the herbivores to crops, enable wild mice to initiate an aversion reaction, show a remarkable avoidance effect on nematodes, generate an avoidance effect on herbivores such as cattle and sheep, and the like. In conclusion, the SH initiates the avoidance reaction of animals by activating the TRPA1 ion channel of the spine and invertebrate, can be developed into a potential insect repellant or biopesticide as a resource, and is applied to the field of agricultural pest control.