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41 results about "Azadirachtin H" patented technology

Azadirachtin, a chemical compound belonging to the limonoid group, is a secondary metabolite present in neem seeds. It is a highly oxidized tetranortriterpenoid which boasts a plethora of oxygen bearing functional groups, including an enol ether, acetal, hemiacetal, tetra-substituted epoxide and a variety of carboxylic esters.

Industrial large scale extracting method for nimbin dry powder

The invention discloses a method for industrially extracting azadirachtin dry powder in great amount, which is used for solving the problem of industrially extracting the azadirachtin dry powder as a raw material of pesticide in great amount. The azadirachtin dry powder comprises a neem methanol crude extract, and is prepared by the following steps: preparing a phase separation solution by an ammonium sulphate solution, and preparing an extraction liquid by ethyl acetate and methylene dichloride; removing clotted oil residual and lower separated liquid phase; collecting oil phase; concentrating by a film evaporator and a condenser; reversely extracting and degreasing by n-hexane and petroleum ether; collecting an organic solvent; centrifugalizing a target product; drying and crushing; and the like. The method saves the solvent; the yield for extracting azadirachtin once reaches 82 percent, and reaches over 96 percent if extraction is repeated once with purity reaching 23 to 26 percent; industrialized production yield and purity are high; the method is simple; furthermore, amino acid, protein, nucleic acid, polysaccharide, alcohols, aldehydes, alkaloid, organic acid and other organic materials can be effectively separated with improved stability. The azadirachtin dry powder can be used as powder, suspension, tablet and other advanced preparation formulations. The method does not have high requirement on equipment, and is convenient for large-scale manufacture.
Owner:牛赡光 +1

Insect prevention formula for ham and salted dried fish and use method thereof

The invention relates to an insect prevention formula for ham and salted dried fish and a use method thereof. The formula is as follows: one liter of water or ethanol solution with light concentration contains 50mg to 300mg of matrine, or the content of matrine in one liter of water or ethanol solution with light concentration is reduced to 10mg to 50mg, and then 20mg to 100mg of azadirachtin or natural pyrethrum is added. The use method comprises the following steps: after being salted and before air-drying, the fish is washed, immersed into the solution prepared according to the formula for 5 minutes to 30 minutes and then taken out for air-drying; and after being salted and before air-drying, the ham is washed, immersed into the solution prepared according to the formula for 5 minutes to 30 minutes and then taken out for air-drying, and goes through the subsequent processing of traditional technique. The insect prevention formula completely adopts natural plant extracts for insect and fly prevention, does not relate to any synthetic chemical pesticide, has easy operation and insect prevention rate higher than 98 percent, and fully retains the traditional flavor and color and lustre of the ham and the salted dried fish, with only 0.4 yuan per kilogram of cost increase; and besides ensuring the traditional sensory quality of the ham and the salted dried fish, the insect prevention formula causes no potential safety hazard and can be applied in large scale.
Owner:ZHEJIANG UNIV

Insecticide for Chinese herbal medicine planting and preparation method thereof

The invention discloses an insecticide for Chinese herbal medicine planting and a preparation method thereof. The insecticide for Chinese herbal medicine planting is prepared from the following raw materials in parts by weight: 10-12 parts of agritol, 5-7 parts of alkaloid, 2-3 parts of beauveria bassiana, 3-5 parts of green muscardine fungus, 2-4 parts of paecilomyces varioti, 1-3 parts of aschersonia, 1-3 parts of verticillium, 6-8 parts of chlorbenzuron, 10-12 parts of nicotine, 1-3 parts of toosendanin, 10-12 parts of transdermal agents, 5-10 parts of pumpkin grout, 4-6 parts of abamectinmissible oil, 4-6 parts of azadirachtin missible oil, 5-7 parts of spinetoram suspending agents and 100-120 parts of water. According to the insecticide for the Chinese herbal medicine planting and the preparation method thereof, the proportion of components of the insecticide for the Chinese herbal medicine planting and preparation technology parameters are strictly controlled, biological insecticide raw materials are adopted, materials taking is convenient, the cost is low, control period is long and efficient, injurious insects are difficult to generate drug resistance, drug function time can be rapidly accelerated through the addition of the transdermal agents, compared with other insecticides in the market, the same drug function can be reached only requiring one third to half same dosage, and the suitable insecticide range is wide.
Owner:江西樟树成方中药饮片有限公司
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