1,4-Bis{3-[4-(dimethyl-amino)benzyl-ideneamino]prop-yl}piperazine.

The mol-ecule of the title compound, C(28)H(42)N(6), has site symmetry with the centroid of the piperazine ring located on an inversion center. The piperazine ring adopts a chair conformation. The benzene ring and propyl-piperazine are on opposite sides of the C=N bond, showing an E configuration.

[Study on the use of ultrasound technique in extraction of polysaccharides from Loquat leaf].

In order to gain the optimal extract condition of extraction polysaccharides in Loquate leaf by ultrasound technique, the single factor and the orthogonal experiments were carried. The results showed that the optimal condition turned out to be ultrasound extraction time 35 min, ultrasound power 120W, extraction temperature 60 degrees C and the liquid-to-solid ratio 12: 1. In contrast to conventional extraction method, the ultrasound technique could be a better method for extracting the polysaccharides from Loquat leaf with a higher yield and shorter time.

[Study on the dynamic model of supercritical fluid extraction of effective ingredients from natural plant].

In order to obtain the theoretical mass transfer model in the process of extracting effective ingredients from natural plant by Supercritical Fluid, the mass transfer mechanism was analyzed and the analytical solution of the dynamic model of Supercritical Fluid Extraction was deduced through rational simplifying the differential mass balance equations. The complete extraction time, extraction yield as a function of time and the influence of the diameter of solid material on the extraction yield were calculated by the model and the results of computation fit well with the experimental data of literature. This model can be used to analyze, predict, design and optimize the process of extracting effective ingredients from natural plant by Supercritical Fluid.