[Research on the content of trace elements and heavy metals in the three kinds of Zhejiang specific medicinal materials before and after processing].

By establishing the ICP-MS determining method, we determined the contents of Mn, Fe, Cu, Zn, Cr, As, Cd and Pb in the three kinds of Zhejiang specific medicinal materials before and after processing them. The recovery ratio with standard addition of the method is between 95.2% and 106.

[Determination of trace elements in Lophatherum gracile brongn from different habitat by microwave digestion-atomic absorption spectroscopy].

A method of microwave digestion technique was proposed to determine the content of Zn, Fe, Cu, Mn, K, Ca, Mg, Ni, Cd, Pb, Cr, Co, Al, Se and As in Lophatherum gracile brongn of different habitat by atomic absorption spectroscopy. The RSD of the method was between 1.23% and 3.

[Simultaneous determination of four glycosylflavones from Lophatherum gracile by RP-HPLC].

Objective: To develop a RP-HPLC method for simultaneous determination of orientin, isorientin, vitexin and isovitexin in Lophatherum gracile from different habitat and harvesting time.

Method: The HPLC method was applied and the chromatographic column was a Waters XBridge C18 column (4.6 mm x 250 mm, 5 microm).

[Chemical constituents of C-glycosylflavones from Mimosa pudica].

Aim: To study chemical constituents of Mimosa pudica of Hainan province.

Methods: The constituents were separated and purified by column chromatography with macroporous adsorption resin Diaion HP-20, Sephadex LH-20, Toyopearl HW-40, MCI Gel CHP-20, RP-18 and normal phase silica gel. Their structures were identified on the basis of physical and spectral data.