ABSTRACT
Objective To develop a method for determination of iridoid glycosides in Morinda officinalis How.and optimize the extraction methods for iridoid glycosides in Morinda officinalis How.Methods The iridoid glycosides, including monotropein, deacetyl asperulosidic acid,asperulosidic acid and asperuloside as standards, HPLC method was developed to determine the content of iridoid glycosides in Morinda officinalis How.The separation was performed on Venusil MP C18 (250 mm×4.6 mm, 5 μm) column.The mobile phase was acetonitrile (A)-0.2% phosphoric acid and 0.01 disodium hydrogen phosphate buffer salt (B) with gradient elution (0-12 min, 1%-2% A;12-30 min, 2%-25% A).The detection wavelength was 235 nm.The flow rate was set at 1.0 ml/min and the column temperature at 25 ℃.The injection volume was 20 μl.Single factor analysis and orthogonal test were used to optimize extraction method of iridoid glycosides in Morinda officinalis How.Results Monotropein, deacetyl asperulosidic acid, asperulosidic acid and asperuloside showed good linearity (r>0.999 5) in the ranges of 0.375-12 μg, 0.13-4.16 μg, 0.016-0.516 μg and 0.012-0.384 μg, respectively.This validated method has good repeatability, precision, recovery and stability.It was conformed to meet the requirements and regulation.The optimal extraction method included soaking the raw materials with 16 times of 10% ethanol for 9 h, and then extraction by percolation with the flow rate of 0.8 BV/h.Conclusion The HPLC method sensitively and precisely determined the content of iridoid glycosides in Morinda officinalis How.The optimized extraction method extracted these constituents effectively.
ABSTRACT
Objective: To explore the differences of physicochemical properties, antibacterial effect and clinically curative effect between nano silver combined activated carbon gel dressings and traditional dressings in change dressing at puncture site of ascites drainage. Methods: 94 patients with seroperitoneum who were implemented abdominocentesis were divided into observation group (50 cases, who were applied NSAC dressing) and control group (44 cases, who were traditional dressing) as random number table. The inhibition zone method was adopted to test the actual bacteriostasis of two dressings, and the permeability, isolation function of protective screen and adhesive force of the two dressings were compared, respectively. Besides, the maximum use time, infection rate, errhysis degree, changed dressing times in 1 week and the loose situation in changing dressing at puncture site of drainage about the two dressings were compared. Results: The permeability, adhesive force, anti-invading for outside world of dressing in observation group were 3.8 times, 2 times and 1.7 times of that of control group, respectively. At the aspect of inhibition zone, the result of observation was 1.82 times of that of control group. And the maximum usage time of observation group was (8.4±1.8)d, and it was significantly higher than that of control group (5.3±1.2)d, (t=9.683, P<0.05). The difference of times of changed dressing between observation group (1.2±0.3 times) and control group (2.7±0.8 times) was statistically significant (t=-12.318, P<0.05). The loose rate, infection rate and errhysis rate of III grade of observation group (11.2%,3.33% and 2.0%) were significantly better than that of control group (29.5%, 18.2% and 15.9%) (x2=4.468, x2=4.951, x2=6.616, P<0.05). Conclusion:Compared to traditional dressing, novel nano silver conbined activated carbon gel dressings has obvious superiority in physicochemical properties, antibacterial effect and clinically curative effect, and it is worth to be extensively popularized in changing dressing for ascites drainage at puncture site.