Supercritical carbon dioxide was used to extract pyrethrin from pyrethrum flowers.

Extraction of active constit ue nts from pyrethrum by supercritical CO_2 at different conditions of pressure?t emperture to estimate the yield and quality,and the relation of CO_2 outflow an d contact time.

Microwave extraction of the dry flower of pyrethrum, using a reconstructed home microwave oven as main equipment, is studied in this paper.

Identification of Endophytic Fungi in Pyrethrum cinerariifolium Trev.;

Study on Callus Induction of Pyrethrum cinerariifolium Trev.;

Induction,preservation and differentiation of calliof Pyrethrum cinerariifolium Trev.;

A Preliminary Study on Population and Distribution of Endophytic Fungi from Pyrethrum cinerariifolium;

Studies on the Flowering Characteristics and Harvest Time of Pyrethrum cinerariifolium;

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.

Study on extraction of pyrethrin by compressed CO_2;

Supercritical carbon dioxide was used to extract pyrethrin from pyrethrum flowers.

Compared with Soxhlet method and supercritical carbon dioxide extraction, microwave extraction of pyrethrins is a rapid method (about 200 s) with less solvent consumption (about 240 mL), higher yield and better product with light color.