水介质中二甲基姜黄素脂质体对金属离子的荧光识别

通过薄膜分散法制备二甲基姜黄素(ASC-J9)脂质体,其粒径分布均匀且在水中的分散效果好,平均粒径为145. 7 nm,分散系数为0. 361。将ASC-J9脂质体作为水溶性的荧光探针,通过荧光猝灭法可选择性识别Fe^(3+)、Fe^(2+)及Cu^(2+)。经过条件筛选得到最佳荧光测试条件为:ASC-J9脂质体浓度为5. 0×10^(-5)mol/L,平衡时间5 min,测试温度25℃。由Job's曲线和荧光滴定结果判断该探针与Fe^(3+)和Cu^(2+)的络合比均为1∶1,与Fe~^(2+)的络合比为2∶1; Stern-Volmer方程判断该荧光猝灭类型为静态猝灭,结合常数分别为KFe(Ⅲ)=9. 63×10~4L/mol,KFe(Ⅱ)=3. 65×10~5L/mol,KCu(Ⅱ)=2. 32×10~5L/mol;该识别体系检测快速、灵敏度高,对Fe^(3+)、Fe^(2+)、Cu^(2+)的线性范围分别为:5. 0×10^(-7)~3. 0×10^(-5)、5. 0×10^(-7)~1. 75×10^(-5)、5. 0×10^(-7)~2. 5×10^(-5)mol/L,检出限分别为6. 41×10^(-7)、3. 28×10^(-7)、5. 08×10^(-7)mol/L。

An electrospun scaffold loaded with anti-androgen receptor compound for accelerating wound healing

Current dermal regenerative scaffolds provide wound coverage, and structural support and guidance for tissue repair, but usually lack enough bio-signals needed for speeding up skin cell growth, migration, wound closure, and skin regeneration. In this study, an androgen receptor (AR) inhibitor called ASC-J9 is used to demonstrate the concept and feasibility of fabricating drug-loaded scaffolds via electrospinning. Inhibition of androgen is known to promote skin wound healing. The novel ASC-J9 - loaded porous scaffold was fabricated for skin wound repair using electrospun fibers of collagen and polycaprolactone (PCL) blend. Our preliminary results indicated that ASC-J9 - loaded scaffolds facilitated more efficient attachment and ingrowth of dermal fibroblasts, compared to the control collagen-PCL scaffold. A significant increase of cell proliferation was observed with the drug-loaded scaffold over a 28-day period. The drug-loaded scaffold also accelerated keratinocyte migration and wound closure in a contraction-inhibited mouse wound model over 21 days. The data indicated a sustained release of ASC-J9 from the scaffold and its potential to accelerate wound healing by promoting cell proliferation and migration over an extended period of time. More importantly, our results proved the concept and feasibility of fabricating drug-releasing or bioactive dermal scaffolds for more effective wound healing.

高效液相色谱-质谱联用测定大鼠全血中二甲基姜黄素的浓度

目的建立检测大鼠全血中ASC-J9的高效液相色谱-质谱联用（HPLC-MS/MS）。方法方法全血样本经液液萃取提取分离,色谱柱为Symmetry C18（4.6 mm×150 mm,5μm）,流动相为纯水（含0.1%甲酸和10 mmol·L-1甲酸铵）-乙腈,流速为1.0 m L·min-1,质谱分流0.4 m L·min-1,柱温35℃,大气压电喷雾离子源（ESI）,正离子模式多重反应选择离子检测（MRM）。结果 ASC-J9线性范围为3.54~1 180 ng·m L-1,提取回收率在83.19%~87.27%,日内、日间RSD均小于8.89%。结论本方法专属性强,灵敏度高,适用于ASC-J9药动学研究。