RESUMEN
Objective To optimize the prescription of GA and GB hydrophilic gel matrix tablets; To study the in vitro release mechanism. Methods On the basis of the results of the mono-factor investigation, mixture uniform design was used to optimize the handicraft molding prescription of GA and GB hydrophilic gel matrix tablets. The release mechanism was investigated by the vitro of the GA and GB hydrophilic gelmatrix tablets to accumulate releasing rate to conduct linear fitting. Results The optimized prescription of GA and GB hydrophilic gel matrix tablets was: powder: HPMC: lactose=23:24:53. Conclusion Mixture uniform design can be used to optimize the prescriptions of GA and GB hydrophilic gel matrix tablets, and the results are accurate. The hydrophilic gelmatrix tablets release medicine by non-Fick mechanism, and the medicine release is in accordance with zero-order.
RESUMEN
The free membrane of Eudragit L100/S100 which is pH-sensitive, colon-specific was prepared by plane casting films. The film humidity, species and amount of plasticizers, the ratio of membrane material was investigated. The rate of membrane permeability and mechanical properties were used as indicators of orthogonal experiment, and its related properties were studied. The results show that the mechanical properties of the membrane and phragmoid capacity are the best when 30% TEC was used as plasticizer; the ratio of membrane material have little effect on the rate of membrane permeability and mechanical properties. By adjusting the species and amount of plasticizers, the ratio of Eudragit L100/S100, the free membrane which is colon-specific can be obtained.
RESUMEN
<p><b>OBJECTIVE</b>To prepare Qixian decoction pellets.</p><p><b>METHOD</b>The formulation and technological factors influencing the preparation of Qixian decoction were investigated in tangential spray fluid bed choosing the yield of pellets, particle diameter distribution, repose angle, bulk density as inspecting indexes.</p><p><b>RESULT</b>the technological parameters for the preparation of blank pellets were as follows: the ratio of starch and dextrin was 2:1, the adhesive agent was 70% syrup, the rotating speed was 200 r x min(-1), the air blow flow was 15 x 20 L x min(-1), the rate of air flow was 15 L x min(-1), the spay air pressure was 0.15 MPa, and the rotating rate of spray solution pump was 20-50 r x min(-1); The optimized technological parameters for the preparation of Qixian decoction were as follows: the relative density of the extract was 1.12-1.15 g x min(-1), the diluent was MCC and its quantity was 8%, the rotating rate of spray solution pump was 10-12 mL x min(-1), the frequency of the rotor disc was 18-20 Hz, the atomizing pressure was 0.2 MPa, the frequency of the fan was 22 Hz, and the spheronisation and drying time was 30 mins.</p><p><b>CONCLUSION</b>the appearance of the Qixian decoction pellets prepared in tangential spray fluid bed are smoothing and round, the yield of pellets are high, and pellets of the particle size between 500-700 microm is 90.6%.</p>