ABSTRACT
The mixing process is one of the key operation units for solid preparation of traditional Chinese medicine. The physical properties such as particle size, density and viscosity of the mixture are key factors that need to be controlled, which will directly affect the performance of the preparation molding process and product quality. Subsequent dripping process performance and appearance qua-lity of dripping pills will be affected by dynamic viscosity of materials in the mixing process. Based on this, with mixing process of compound Danshen dripping pills as the object, a feedforward control method for the dripping pill mixing process was established based on the concept of quality by design(QbD). Firstly, critical quality attribute(CQA)-dynamic viscosity, critical material attributes(CMAs)-the moisture content of compound Danshen extract, average molecular weight of polyethylene glycol 6000 and critical process parameter(CPP)-mixing temperature were identified through the analysis of properties for multiple batches of the raw materials and excipients as well as technological mechanism. Then the Box-Behnken experimental design was used to establish the regression model among CMA, CPP and CMA(R■=0.972 0, RMSE =16.24) to obtain the design space. Finally, through the verification of three batches within the design space, the mixing process temperature was adjusted according to the properties of the raw materials and exci-pients to achieve accurate control of the dynamic viscosity attribute. The relative deviation between the actual dynamic viscosity value and the target value was less than 3.0 %. The feedforward control of the mixing process of compound Danshen dripping pills was rea-lized in this study, which can contribute to improving quality consistency of the mixing process intermediates, simultaneously provide a reference for the research on the process quality control of other Chinese medicine dripping pills.
Subject(s)
Drugs, Chinese Herbal , Medicine, Chinese Traditional , Quality Control , Research DesignABSTRACT
@#Advanced glycation end products(AGEs)accumulate in various tissues in the body, and induce a series of biological responses by regulating the expression of related factors and activating signal pathways, causing age-related diseases and neurodegenerative diseases, such as Alzheimer's disease, Parkinson's disease and Atherosclerosis. Glaucoma, which is the leading cause of vision loss after cataract worldwide, is a degenerative disease of the optic nerve that ultimately leads to irreversible visual field loss. The accumulation of excessive AGE sin the retina and other eye tissues of glaucoma patients activates signal pathways and triggers biological responses, causing damage to the structure and function of tissues and cells, and participating in the pathogenesis of glaucoma. This article mainly describes the latest progress of AGEs in glaucoma pathogenesis, treatment, screening and other related research, and provides new ideas and research methods for the prevention and treatment of glaucoma.
ABSTRACT
@#Advanced glycation end products(AGEs)accumulate in various tissues in the body, and induce a series of biological responses by regulating the expression of related factors and activating signal pathways, causing age-related diseases and neurodegenerative diseases, such as Alzheimer's disease, Parkinson's disease and Atherosclerosis. Glaucoma, which is the leading cause of vision loss after cataract worldwide, is a degenerative disease of the optic nerve that ultimately leads to irreversible visual field loss. The accumulation of excessive AGE sin the retina and other eye tissues of glaucoma patients activates signal pathways and triggers biological responses, causing damage to the structure and function of tissues and cells, and participating in the pathogenesis of glaucoma. This article mainly describes the latest progress of AGEs in glaucoma pathogenesis, treatment, screening and other related research, and provides new ideas and research methods for the prevention and treatment of glaucoma.
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the design, procedures and effect of latissimus dorsi-myocutaneous flap (LDMF) for breast reconstruction.</p><p><b>METHODS</b>From May, 2005 to April, 2006, 18 consecutive patients underwent breast reconstruction with LDMF. Combined breast implants were also inserted in 8 of the 18 cases. The procedure duration, complication and aesthetic results were assessed.</p><p><b>RESULTS</b>The mean procedure duration was 147 minutes. There was no flap loss and no severe complications. The reconstructed breast was a little over high in one patient. All the other 17 patients (94.4%) were very satisfied with the aesthetic result.</p><p><b>CONCLUSIONS</b>LDMF or a combination of LDMF with breast implants is a reliable method for breast reconstruction with low complication. The procedure is easily performed with good aesthetic result.</p>