The contents of pyrethrins,pyrethrins Ⅰ and pyrethrinsⅡ in dry capitula of sixteen autotetra-ploid lines of Pyrethrum cinerariifolium(Trev.

The paper introduced the principle ,the test conditions and the operation steps of dry-ing the pyrethrum flower ;The four drying methods :drying the air flow ,far infrared ray ,sunsh-ing and vacuum were described ;The drying conditions ,the moisture of tile dry flower and extrac-tion.

Four crossbred barrows were used to evaluate the nutritional value of Pyrethrum cinerariioflium Trev residue(PCTR).

Influence of supercritical carbon dioxide extraction of pyrethrins by using ultrasound;

Preliminary study on the effect of ultrasound on supercritical carbon dioxide extraction of pyrethrins;

Separation and Purification of Natural Pyrethrins by Reversed Phase High Performance Liquid Chromatography;

Efficacy of pyrethrin aerosol against mosquitoes and flies;

Chromatographic techniques used in the sepration, preparation, structural comfirmation and determination of pyrethrin, cinerin, jasmolin, pyrethrin, cinerin and jasmolin are mainly TLCGCHPLC and GC-MS.

The variety selection was also conducted by yield determination, pyrethrin content analysis and pesticide controlling experiment.