ABSTRACT
OBJECTIVE:To discuss the improvement in Soxhlet extraction with ore and shell hard Chinese meteria madica taking Plastrum Testudinis as example.METHODS:On the basis of normal Soxhlet extracter,larger Soxhlet extracter on Plastrum Testudinis was experimented using saturated salt-water-bath,quadruplicity cover circle and timer.Large Soxhlet extracter was compared with normal Soxhlet extracter and stirring-reflux method by HPLC analysis,yield and clearance rate of DPPH.RESULTS:There were no significant difference between normal and larger Soxhlet extracters,but the stirring-reflux method was inferior to these two methods.CONCLUSION:The improved larger Soxhlet extraction is a thorough,high-efficient,convenient,economical and healthy extracting method for ore and shell hard Chinese materia medica.
ABSTRACT
The semi-automatic liquid nitrogen extracter is lowcost and easy-to-use,which can prevent the volatilization of the liquid nitrogen during the extraction.
ABSTRACT
We develop a computer program which extracts and displays all TITLES form MEDLINE CD-ROM preselected data. This method is helpful for rapid screening large amount of preselected data. The procedure is very simple and responses promptly.