Dual Location, Dual Acidic pH/Reduction-Responsive Degradable Block Copolymer: Synthesis and Investigation of Ketal Linkage Instability under ATRP Conditions
作者:Arman Moini Jazani、Jung Kwon Oh
DOI:10.1021/acs.macromol.7b02070
日期:2017.12.12
macroinitiator). Conducting ATRP allows for the synthesis of a series of DLDSRD diblock copolymersconsisting of a hydrophilic poly(ethylene glycol) block covalently conjugated through a ketal linkage with a hydrophobic polymethacrylate block having multiple disulfide pendants. Analysis shows an unexpectedly high degree of polymerization of the hydrophobic polymethacrylate block that could be attributed to the instability
Ketal Cross-Linked Poly(ethylene glycol)-Poly(amino acid)s Copolymer Micelles for Efficient Intracellular Delivery of Doxorubicin
作者:Sang Jin Lee、Kyung Hyun Min、Hong Jae Lee、Ahn Na Koo、Hwa Pyeong Rim、Byeong Jin Jeon、Seo Young Jeong、Jung Sun Heo、Sang Cheon Lee
DOI:10.1021/bm101517x
日期:2011.4.11
showed that ketal cross-linked micelles were taken up by the MCF-7 breast cancer cells via endocytosis and transferred into endosomes to hydrolyze the cross-links by lowered pH and finally facilitate the DOX release to inhibit proliferation of cancer cells. This ketal cross-linkedpolymer micelle is promising for enhanced intracellular delivery efficiency of many hydrophobic anticancer drugs.
Substituent Effects on the pH Sensitivity of Acetals and Ketals and Their Correlation with Encapsulation Stability in Polymeric Nanogels
作者:Bin Liu、S. Thayumanavan
DOI:10.1021/jacs.6b11181
日期:2017.2.15
that the ρ value for the hydrolysis of benzylideneacetals is about -4.06, which is comparable to an SN1-like process. This shows that there is a strong, developing positive charge at the benzylic position in the transition state during the degradation of acetals. This positively charged transition state is consistent with the relative degradation rates of acetals vs ketals (correlated to stabilities