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分别以2,2-双羟基丙酸(DMPA)和N-甲基二乙醇胺(MDEA)作扩链剂,采用自乳化法成功制备出带有正、负电荷的阳、阴离子聚氨酯/羟基磷灰石(PU/HA)微球,并考察HA的复合比例对微球形貌、理化性能的影响。在此基础上,通过微球间的静电作用力,将制备出的阴、阳离子复合微球自组装形成凝胶体系,并对其力学性能进行探究。SEM、ζ电位和激光粒度结果显示成功制备出具有一定形貌的带电微球,其中当扩链剂含量为15%(n/n)、HA含量为10%(w/w)时,微球形貌较佳且粒度分布均匀;X射线衍射、热分析结果表明,微球确为一定比例的HA与PU复合产物;自组装体系的流变学测试结果表明,微球组装后的产物呈类凝胶状态,具有较高的弹性模量,并有一定的可注射性。同时,骨髓间充质干细胞(BMSCs)可在组装材料表面粘附、铺展,生长良好。 相似文献
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Liza Jzsa Gbor Vasvri Dvid Sinka Dniel Nemes Zoltan Ujhelyi Mikls Vecsernys Judit Vradi Ferenc Fenyvesi Istvn Lekli Alexandra Gyngysi Ildik Bcskay Plma Fehr 《Molecules (Basel, Switzerland)》2022,27(19)
Turmeric has been used for decades for its antioxidant and anti-inflammatory effect, which is due to an active ingredient isolated from the plant, called curcumin. However, the extremely poor water-solubility of curcumin often limits the bioavailability of the drug. The aim of our experimental work was to improve the solubility and thus bioavailability of curcumin by developing self-nano/microemulsifying drug delivery systems (SN/MEDDS). Labrasol and Cremophor RH 40 as nonionic surfactants, Transcutol P as co-surfactant and isopropyl myristate as the oily phase were used during the formulation. The average droplet size of SN/MEDDS containing curcumin was between 32 and 405 nm. It was found that the higher oil content resulted in larger particle size. The drug loading efficiency was between 93.11% and 99.12% and all formulations were thermodynamically stable. The curcumin release was studied at pH 6.8, and the release efficiency ranged between 57.3% and 80.9% after 180 min. The results of the MTT cytotoxicity assay on human keratinocyte cells (HaCaT) and colorectal adenocarcinoma cells (Caco-2) showed that the curcumin-containing preparations were non-cytotoxic at 5 w/v%. According to the results of the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and superoxide dismutase (SOD) assays, SNEDDS showed significantly higher antioxidant activity. The anti-inflammatory effect of the SN/MEDDS was screened by enzyme-linked immunosorbent assay (ELISA). SNEDDS formulated with Labrasol as surfactant, reduced tumor necrosis factor-alpha (TNF-α) and interleukin-1 beta (IL-1β) levels below 60% at a concentration of 10 w/w%. Our results verified the promising use of SN/MEDDS for the delivery of curcumin. This study demonstrates that the SN/MEDDS could be promising alternatives for the formulation of poorly soluble lipophilic compounds with low bioavailability. 相似文献
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分别以2,2-双羟基丙酸(DMPA)和N-甲基二乙醇胺(MDEA)作扩链剂,采用自乳化法成功制备出带有正、负电荷的阳、阴离子聚氨酯/羟基磷灰石(PU/HA)微球,并考察HA的复合比例对微球形貌、理化性能的影响。在此基础上,通过微球间的静电作用力,将制备出的阴、阳离子复合微球自组装形成凝胶体系,并对其力学性能进行探究。SEM、ζ电位和激光粒度结果显示成功制备出具有一定形貌的带电微球,其中当扩链剂含量为15%(n/n)、HA含量为10%(w/w)时,微球形貌较佳且粒度分布均匀;X射线衍射、热分析结果表明,微球确为一定比例的HA与PU复合产物;自组装体系的流变学测试结果表明,微球组装后的产物呈类凝胶状态,具有较高的弹性模量,并有一定的可注射性。同时,骨髓间充质干细胞(BMSCs)可在组装材料表面粘附、铺展,生长良好。 相似文献
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