Influences of doping mesoporous magnesium silicate on water absorption, drug release, degradability, apatite-mineralization and primary cells responses to calcium sulfate based bone cements

2017 ◽  
Vol 75 ◽  
pp. 620-628 ◽  
Author(s):  
Zhengrong Gu ◽  
Sicheng Wang ◽  
Weizong Weng ◽  
Xiao Chen ◽  
Liehu Cao ◽  
...  
Keyword(s):  
Drug Release ◽  
Water Absorption ◽  
Calcium Sulfate ◽  
Magnesium Silicate ◽  
Bone Cements ◽  
Primary Cells

Effect of coagulation bath parameters on the morphology and absorption behavior of a skin–core filament based on biomedical polyurethane and native silk fibroin microparticles

2019 ◽  
Vol 90 (3-4) ◽  
pp. 460-468 ◽  
Author(s):  
Yan Zhuang ◽  
Han Wang ◽  
Linfeng Wang ◽  
Changjun Liu ◽  
Yuan Xu ◽  
...  
Keyword(s):  
Drug Release ◽  
Water Absorption ◽  
Silk Fibroin ◽  
Controlled Drug Release ◽  
Coagulation Bath ◽  
Wet Spinning ◽  
Electron Microscopy Analysis ◽  
Potential Applications ◽  
Spinning Process ◽  
Biomedical Polyurethane

This study investigates the effect of the constituents and temperature of a coagulation bath on the morphology and water absorption behavior of a skin–core filament, which has potential application in the field of controlled drug release, based on biomedical polyurethane (BPU) and native silk fibroin microparticles (NSFPs). BPU solution and BPU/NSFP blend solution were extruded from the cortex and core channel of a coaxial double injector into a coagulation bath with different constituents and at different temperatures to form filaments. Scanning electron microscopy analysis of the skin–core filament prepared by wet-spinning revealed that the addition of ethanol decreased the exchange speed between the solvent and non-solvent and led to the formation of micropores on the surface. Meanwhile, the interface between the cortex and core became pronounced and the water absorption capability of the filament decreased with increasing ethanol concentration in the coagulation bath. The high temperature of the coagulation bath also improved the exchange speed between the solvent and non-solvent; however, its effect on the morphology of the filament was weak. Thus, a skin–core filament with different morphologies and water absorption behaviors was fabricated by controlling the constituents and temperature of the coagulation bath during the wet-spinning process. This skin–core filament has potential applications in controlled drug release.

STUDY OF THE DIFFERENT RELEASE CHARACTERISTICS OF ANTIBIOTICS FROM PATIENTS: A DYNAMIC ELUTING SYSTEM TO INVESTIGATE DRUG RELEASE FROM ANTIBIOTIC-IMPREGNATED CALCIUM SULFATE DELIVERY

2015 ◽  
Vol 15 (01) ◽  
pp. 1550012
Author(s):  
YANG ZHANG ◽  
RENJIE WU ◽  
YING HU ◽  
YU DONG ◽  
LIFENG SHEN ◽  
...  
Keyword(s):  
Drug Release ◽  
Delivery System ◽  
Release Rate ◽  
Calcium Sulfate ◽  
Fickian Diffusion ◽  
Release Behavior ◽  
Cumulative Release ◽  
In Vivo Release

Background: Antibiotic-impregnated calcium sulfate delivery systems (ACDS) are commonly used to treat chronic osteomyelitis. Our research is to investigate drug release in vitro over a longer period, as a cautious predictor of in vivo release. Methods: The local release behavior of antibiotic in vitro was simulated. The consecutive dynamic eluting experiment was performed based on the pro-operative characteristic of osteomyelitis patients and the determined results of drug concentration in the human drainage tissue fluid (DTF). The concentration of each drug in the receiving solution was detected by ultra-performance liquid chromatography-tandem quadrupole detector mass spectrometry. The ACDS was reviewed by scanning electronic microscopy (SEM) after 48 h, and prepared to be eluted for another examination after 33 days. The mechanism of antibiotic release was analyzed by using the Ritger–Peppas and Weibull equations. Results: The cumulative release rate of vancomycin in a vancomycin-calcium sulfate delivery system (VCDS) was 77.50 % (3.0 mm diameter) and 72.43 % (4.8 mm diameter), while that of the tobramycin in a tobramycin-calcium sulfate delivery system (TCDS) was 88.0 % (3.0 mm diameter) and 84.55 % (4.8 mm diameter). At the 15th day, approximately 27.92% of vancomycin was and 29.35% of tobramycin was released from the local implant in vivo. Using SEM, numerous vancomycin and tobramycin particles were found to be attached to the columnar calcium sulfate crystals at the start of the experiment. The release behavior of the two antibiotics followed a combination of Fickian diffusion and Case II transport mechanisms within the first 48 h, and a Fickian diffusion mechanism during the subsequent time period. The correlation coefficient of tobramycin and vancomycin in vivo and in vitro was 0.9704–0.9949 and 0.9549–0.9782, respectively. Conclusion: A good correlation of the in vivo and in vitro cumulative release rates was observed by comparing the cumulative release rate of drugs in vitro by means of the dynamic eluting model, and in the DTF. Therefore, our study has proved that it is possible to use the dynamic eluting model as a cautious predictor of in vivo release.

The effect of calcium phosphate and silk fibroin nanofiber tuning on properties of calcium sulfate bone cements

2020 ◽  
Vol 16 (1) ◽  
pp. 015009
Author(s):  
Rui Xu ◽  
Xiaojie Lian ◽  
Liqin Zhao ◽  
Yan Wei ◽  
Dingyu Hou ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Silk Fibroin ◽  
Calcium Sulfate ◽  
Bone Cements

scholarly journals FORMULATION DEVELOPMENT AND EVALUATION OF FAST DISINTEGRATING TABLETS OF CINITAPRIDE HYDROGEN TARTARATE BY USING DIRECT COMPRESSION TECHNIQUE

2017 ◽  
Vol 9 (6) ◽  
pp. 98 ◽  
Author(s):  
Krishna Mohan Chinnala ◽  
Sirish Vodithala
Keyword(s):  
Drug Release ◽  
Water Absorption ◽  
Bulk Density ◽  
Direct Compression ◽  
Disintegration Time ◽  
Absorption Ratio ◽  
Wetting Time ◽  
Tapped Density ◽  
Fast Disintegrating Tablets

Objective: In the present study, efforts were taken to develop fast disintegrating tablets of Cinitapride hydrogen tartrate, is a gastro-prokinetic agent and antiulcer agent with an objective to achieve rapid disintegration, and further improving the bioavailability of the drug. Also, to resolve the swallowing problems (Dysphasia) in pediatric, geriatric patients by rapid disintegration in saliva and improve the patient compliance.Methods: Fast disintegrating tablets were prepared by direct compression method using superdisintegrants like crospovidone (CP), croscarmellose sodium (CCS), sodium starch glycolate (SSG) and combination of super-disintegrants in different concentrations. The prepared formulations were evaluated for the pre-compression parameters like bulk density, tapped density, Carr’s compressibility, Hausner’s ratio and angle of repose. The prepared batches of fast disintegrating tablets of Cinitapride hydrogen tartarate were evaluated for hardness, weight variation, thickness, friability, drug content, disintegration time, wetting time, water absorption ratio, and in vitro dissolution profile.Results: Bulk density and tapped density were found in the range of 0.412–0.432 g/cc and 0.507–0.528 g/cc respectively. In all formulations, tablet weight and thickness were within mean±9.5% and mean±5% respectively. Wetting time values lie between 19.76 to 39.53 sec. Water absorption ratio ranged from 57.30 to 78.82 %. The in vitro disintegration time for all the 12 formulations varied from 17.43 to 38.61 seconds. Formulation F8 which contained crosspovidone have recorded drug release 96.94±0.47% at the end of 30 min.Conclusion: The formulation containing crospovidone (F8) showed better performance in terms of disintegration time and drug release when compared to other formulations.

Bone cements in the calcium phosphate–calcium sulfate system

2016 ◽  
Vol 467 (2) ◽  
pp. 136-139 ◽  
Author(s):  
V. V. Smirnov ◽  
O. S. Antonova ◽  
M. A. Goldberg ◽  
S. V. Smirnov ◽  
L. I. Shvorneva ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Calcium Sulfate ◽  
Bone Cements

scholarly journals Drug release from calcium sulfate-based composites

2014 ◽  
Vol 103 (1) ◽  
pp. 135-142 ◽  
Author(s):  
Bryan R. Orellana ◽  
J. Zach Hilt ◽  
David A. Puleo
Keyword(s):  
Drug Release ◽  
Calcium Sulfate

FIXATION OF COMMINUTED DISTAL RADIUS FRACTURES WITH A MIXTURE OF CALCIUM PHOSPHATE AND CALCIUM SULFATE CEMENT

Hand Surgery ◽  
2011 ◽  
Vol 16 (02) ◽  
pp. 223-228 ◽  
Author(s):  
Mario G. Solari ◽  
Emily Spangler ◽  
Andrew Lee ◽  
Ronit Wollstein
Keyword(s):  
Calcium Phosphate ◽  
Bone Cement ◽  
Distal Radius ◽  
Calcium Sulfate ◽  
Distal Radius Fractures ◽  
Bone Cements ◽  
Radius Fractures ◽  
Autologous Bone Grafting ◽  
The Face ◽  
Comminuted Fractures

Distal radius fracture alignment and stabilization can be a surgical challenge in the face of severe comminution and bone loss. We describe a technique using a calcium phosphate/sulfate bone cement, as an adjunct to internal fixation. This bone cement is biocompatible, osteoconductive, and sets quickly with an isothermic reaction. The use of bone cement eliminates the need for primary autologous bone grafting and allows for easier reduction and retention of reduction at the time of surgery. Bone cement is employed for the following purposes in comminuted fractures: (1) to fill a void due to lost or crushed cancellous bone, (2) to hold larger unstable fragments while hardware is placed, and (3) to retain fragments too small to take hardware. Available bone cements, studies involving the use of bone cement for distal radius fractures, indications, and surgical technique will be reviewed.

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