The continuous countercurrent process of extracting available ingredients from gingko leaf;

The paper discusses the possibility and operation condition of the extraction of valuable compounds, which are caffeine from green tea infusion, flavoring materials from yellow water, volatile compounds from Houttuynia cordata Thunb juice and rose essential oil from rose infusion, with supercritical CO_2 in the continuous countercurrent extraction column.

An improved analytical procedure involving five steps sequential extraction is used for particulate heavy metals(Cu,Co,Cd,Pb,Ni).

Acid digestion and a sequential extraction procedure were employed to evaluate the total contents and fractions of REEs in soil,respectively,then the contents of REEs in soil samples and fractions extracted were determined by inductively couple plasma mass spectroscopy.

To separate and evaluate heavy metal fractions properly,the proposed sequential extraction method was optimized by single extraction procedure.

The paper introduces the principle and production proces s of continuous extraction of rutin.

With five-stage countercurrent extraction at ambient temperature,extraction yield of magnesium and calcium is 72.

An analytical method for determination of tetramethylpyrazine (TMP) in ligusticum chuanxiong hort by RP HPLC coupled with countercurrent extraction used for the preconcentration of trace TMP was established.