Preparation and in vivo and in vitro Characteristic Evaluation of Ligustrazine Ophthalmic Liposome Thermosen- sitive Gel / 中国药房

OBJECTIVE：To prepare Liguatrazine opthalmic liposome therm osensitive gel ，and to investigate its in vivo and in vitro characteristics. METHODS ：The ammonium sulfate gradient method was used to prepare Liguatrazine liposomes. The preparation technology was optimized by using orthogonal test. Using poloxamer P 407 as gel matrix ，Liguatrazine liposomes were prepared into thermosensitive gel. A membraneless model was used to study the dissolution and in vitro drug release of the gel. The modified Franz diffusion cell was used to investigate corneal permeability and further determine corneal hydration value. The effects of the gel on the proliferation of human corneal epithelial cell HCE-T. HE staining and Draize test were used to investigate the stimulatory effects of the gel on corneal cells of the rabbit ，and the histological changes of the eyes were observed. RESULTS ：The optimal preparation technology of Liguatrazine liposome was drug-lipid ratio of 1 ∶ 10（m/m），the ammonium sulfate concentration of 0.2 mol/L，phospholipid-cholesterol ratio of 4∶1（m/m），incubation temperature of 45 ℃. Then ligustrazine opthalmic liposome thermosensitive gel was prepared with 23％ poloxamer P 407 as gel matrix. The gel had good gelatinization temperature. The in vitro drug release and dissolution showed zero-order kinetic characteristics ，and in vitro drug release of the gel was mainly related to dissolution （R2＝0.993 4）. The cumulative transcorneal permeability of the gel was 43.3％ within 6 hours and corneal hydration value was 72.98％. Low and medium concentrations （1，5 mg/L）of Ligustrazine opthalmic liposome thermosensitive gel had no obvious proliferation toxicity to HCE-T cells ，but it showed cytotoxicity at high concentration （10 mg/L）. The mean Draize eyeirritation score of the gel on rabbit cornea was within non-stimulation，and there was no abnormal change in rabbit （No.2018001） corneal histology. CONCLUSIONS ： Prepared Ligustrazine opthalmic liposome thermosensitive gel has a suitable phase transition temperature ，good corneal permeability ，and low corneal irrit ation.

Use of Omaha system in community nursing and transitional care / 中华护理杂志

The authors have applied the Omaha system in six different researches conducted in Hong Kong and mainland China in the last ten years. These researches have been conducted using different client groups,specialty nurses,and in the hospital,clinic and community settings. The Omaha system was found to be instrumental in serving as a conceptual framework for study,designing the intervention protocol,identifying clients' health problems,defining nursing interventions and evaluating research outcomes. The Omaha system is a valuable tool for research and practice and is worth exploring further for its application in mainland China,particularly in the areas of community nursing and transitional care.