Release of bioactive volatiles from supramolecular hydrogels: influence of reversible acylhydrazone formation on gel stability and volatile compound evaporation
作者:Barbara Buchs (née Levrand)、Wolfgang Fieber、Florence Vigouroux-Elie、Nampally Sreenivasachary、Jean-Marie Lehn、Andreas Herrmann
DOI:10.1039/c0ob01139h
日期:——
systems for the slow release of bioactive carbonyl derivatives. Hydrogels formed from 1 were found to be significantly more stable than those obtained from guanosine. Both physical inclusion of bioactive volatiles and reversible hydrazone formation could be demonstrated by indirect methods. Gel stabilities were measured by oscillating disk rheology measurements, which showed that thermodynamic equilibration
在碱金属阳离子的存在下,鸟苷5'-酰肼(1)通过选择性自组装成G四元结构而形成稳定的超分子水凝胶。除了物理上被捕获在凝胶结构中之外,生物活性醛或酮还可以与G四元组外围的游离酰肼功能可逆地反应,形成酰基hydr。这种特殊性使得水凝胶作为缓慢释放生物活性羰基衍生物的递送系统而引起人们的兴趣。发现由1形成的水凝胶比从中获得的凝胶更稳定鸟苷。可以通过间接方法证明生物活性挥发物的物理包容和可逆的形成。通过振荡盘流变学测量来测量凝胶稳定性,这表明凝胶的热力学平衡是缓慢的,并且需要几个冷却和加热循环。此外,结合流变学数据和香料蒸发的动态顶空分析表明,某些羰基化合物的可逆形成影响挥发物的释放,而凝胶的绝对稳定性似乎对蒸发速率没有影响。