Surface-Grafted Stimuli-Responsive Block Copolymer Brushes for the Thermo-, Photo- and pH-Sensitive Release of Dye Molecules

2011 ◽  
Vol 44 (18) ◽  
pp. 7385-7393 ◽  
Author(s):  
Surjith Kumar ◽  
Yves L. Dory ◽  
Martin Lepage ◽  
Yue Zhao
Keyword(s):  
Block Copolymer ◽  
Ph Sensitive ◽  
Dye Molecules ◽  
Stimuli Responsive ◽  
Copolymer Brushes

A dual stimuli responsive fluorescent probe carrier from a double hydrophilic block copolymer capped with β-cyclodextrin

2015 ◽  
Vol 6 (18) ◽  
pp. 3382-3386 ◽  
Author(s):  
Guang Yang ◽  
Zhen Yang ◽  
Chengguang Mu ◽  
Xiaodong Fan ◽  
Wei Tian ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Fluorescent Probe ◽  
Triblock Copolymer ◽  
Ph Sensitive ◽  
Stimuli Responsive ◽  
Self Assembling

A β-cyclodextrin terminated triblock copolymer with both hydrophilic temperature and pH sensitive segments was prepared and characterized in terms of self-assembling and encapsulation behaviors.

Multi-Stimuli-Responsive Mesoporous Membranes and Effect of Molecular Architecture on Thermo- and pH-Responsive Behavior of the grafted Block Copolymer brushes

2019 ◽  
Author(s):  
Yanchun Tang ◽  
Kohzo Ito ◽  
Hideaki Yokoyama
Keyword(s):  
Polymer Brushes ◽  
Diblock Copolymers ◽  
Neutron Reflectivity ◽  
Molecular Architecture ◽  
Stimuli Responsive ◽  
Responsive Polymer ◽  
The Matrix ◽  
Stable Part ◽  
Copolymer Brushes ◽  
Mesoporous Membranes

In this study, we prepared ultrafiltration membranes with a decoupled responses of filtration property to temperature and pH. The membrane preparation method was developed based on our previous work. We utilized methanol-supercritical carbon dioxide (methanol-scCO<sub>2</sub>) selective swelling method to introduce nanopores to block copolymers containing poly(diethylene glycol) methyl ether methacrylate (PMEO<sub>2</sub>MA), poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) and polystyrene (PS) blocks. Formation of the mesoporous barrier layer with PS being the mechanically stable part of the matrix was driven by selective swelling of the PMEO<sub>2</sub>MA-b-PDMAEMA domains. Due to the selective swelling of PMEO<sub>2</sub>MA or PDMAEMA domains to introduce pores, the interior of the pores are covered with PMEO<sub>2</sub>MA or PDMAEMA blocks after pore formation. The PMEO<sub>2</sub>MA-b-PDMAEMA polymer brushes are naturally attached on the pore walls and worked as functional gates. PMEO<sub>2</sub>MA is a non-toxic, neutral thermo-responsive polymer with LCST at 26 ᴼC. PDMAEMA is a typical weak polyelectrolyte with pK<sub>a</sub> value at 7.0-7.5 and also a thermo-responsive polymer revealed a LCST of 20-80 °C in aqueous solution. Therefore, these membranes were expected to have multi dimensions as function of the combination of temperature and pH. Moreover, to understand the detail of the temperature and pH depended conformation transitions of PMEO<sub>2</sub>MA-b-PDMAEMA brushes, those diblock copolymers were end-tethered on flat substrates and analyzed via neutron reflectivity (NR).

scholarly journals Thermoresponsive Cationic Block Copolymer Brushes for Temperature‐Modulated Stem Cell Separation

2020 ◽  
Vol 41 (19) ◽  
pp. 2000308 ◽  
Author(s):  
Kenichi Nagase ◽  
Ayumu Ota ◽  
Tadashi Hirotani ◽  
Sota Yamada ◽  
Aya Mizutani Akimoto ◽  
...  
Keyword(s):  
Stem Cell ◽  
Block Copolymer ◽  
Cell Separation ◽  
Copolymer Brushes

Preparation of pH-sensitive CaP nanoparticles coated with a phosphate-based block copolymer for efficient gene delivery

Polymer ◽  
2012 ◽  
Vol 53 (21) ◽  
pp. 4678-4685 ◽  
Author(s):  
Sangmok Jang ◽  
Seonju Lee ◽  
Heejin Kim ◽  
Jiyeon Ham ◽  
Ji-Hun Seo ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Gene Delivery ◽  
Ph Sensitive ◽  
Efficient Gene

Photo- and Thermo-Dual-Responsive Organic/Inorganic Hybrid Materials

2013 ◽  
Vol 538 ◽  
pp. 181-184 ◽  
Author(s):  
Xin De Tang ◽  
Ye Chen ◽  
Fa Qi Yu ◽  
Mei Shan Pei
Keyword(s):  
Block Copolymer ◽  
Hybrid Materials ◽  
Self Assembly ◽  
Polymeric Materials ◽  
Stimuli Responsive ◽  
Inorganic Hybrid ◽  
Dual Responsive ◽  
Hexyl Methacrylate ◽  
Poly Ethylene ◽  
Copolymer Poly

Organic/inorganic hybrid materials based upon stimuli-responsive copolymers have attracted an inceasing attention. Compared with the polymeric materials, these hybrid materials can form aggregates in aqueous solution with much more stable shape-persistance due to the inorganic structure, which facilitate the mass delivery and long-term life. A novel hybrid material based on a new reactive block copolymer, poly(ethylene oxide)-block-poly{3-(trimethoxysilyl)propyl methacrylate-co-N-isopropylacrylamide-co-6-[4-(4-methoxyphenylazo)phenoxy]hexyl methacrylate} [PEO-P(TMSPMA-NIPAM-AzoMA)] was synthesized via atom transfer radical polymerization (ATRP). The vesicles were obtained by self-assembly of the resulting block copolymer in a selective solvent, and then the PTMSPMA block was subjected to hydrolysis and polycondensation reaction to fix vesicle wall in the presence of triethylamine as a catalyst. The photo- and thermo- dual-responsive properties of the vesicles were investigated.

Schiff base-containing dextran nanogel as pH-sensitive drug delivery system of doxorubicin: Synthesis and characterization

2018 ◽  
Vol 33 (2) ◽  
pp. 170-181 ◽  
Author(s):  
Hongying Su ◽  
Wen Zhang ◽  
Yayun Wu ◽  
Xiaodong Han ◽  
Gang Liu ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Schiff Base ◽  
Drug Release ◽  
Drug Delivery System ◽  
Delivery System ◽  
Ph Sensitive ◽  
Cell Uptake ◽  
Stimuli Responsive ◽  
Drug Release Profile

Stimuli-responsive hydrogels have been widely researched as carrier systems, due to their excellent biocompatibility and responsiveness to external physiologic environment factors. In this study, dextran-based nanogel with covalently conjugated doxorubicin (DOX) was developed via Schiff base formation using the inverse microemulsion technique. Since the Schiff base linkages are acid-sensitive, drug release profile of the DOX-loaded nanogel would be pH-dependent. In vitro drug release studies confirmed that DOX was released much faster under acidic condition (pH 2.0, 5.0) than that at pH 7.4. Approximately 66, 28, and 9% of drug was released in 72 h at pH 2.0, 5.0, and 7.4, respectively. Cell uptake by the human breast cancer cell (MCF-7) demonstrated that the DOX-loaded dextran nanogel could be internalized through endocytosis and distributed in endocytic compartments inside tumor cells. These results indicated that the Schiff base-containing nanogel can serve as a pH-sensitive drug delivery system. And the presence of multiple aldehyde groups on the nanogel are available for further conjugations of targeting ligands or imaging probes.

Recent Progress in Stimuli Responsive Intelligent Nano Scale Drug Delivery Systems: A special focus towards pH sensitive systems

2021 ◽  
Vol 22 ◽  
Author(s):  
Vaidevi Sethuraman ◽  
Kumar Janakiraman ◽  
Venkateshwaran Krishnaswami ◽  
Ruckmani Kandasamy
Keyword(s):  
Drug Delivery ◽  
Cancer Treatment ◽  
Drug Delivery Systems ◽  
Disease Diagnosis ◽  
Delivery Systems ◽  
Ph Sensitive ◽  
Special Focus ◽  
Stimuli Responsive ◽  
Ph Variation ◽  
Responsive Systems

Abstract: Stimuli responsive nanocarriers are gaining much attention due to its versatile multifunctional activities including disease diagnosis and treatment. Recently, clinical applications of nano drug delivery systems for cancer treatment make a considerable challenge due to its limited cellular uptake, low bioavailability, poor targetability, stability issues, and unfavourable pharmacokinetics. To overcome these issues researchers are focussing on stimuli responsive systems. Nano carriers elicit its role through endogenous (pH, temperature, enzyme and redox) or exogenous (temperature, light, magnetic field, ultrasound) stimulus. These systems were designed to overcome the shortcomings such as non-specificity and toxicity associated with the conventional drug delivery systems. The pH variation between healthy cells and tumor microenvironment creates a platform towards the generation of pH sensitive nano delivery systems. Herein, we propose to present an overview of various internal and external stimuli responsive behavior based drug delivery systems. Herein the present review will focus specifically on the significance of various pH- responsive nanomaterials such as polymeric nanoparticles, nano micelles, inorganic based pH sensitive drug delivery carriers such as calcium phosphate nanoparticles, and carbon dots in cancer treatment. Moreover, this review elaborates the recent findings on pH based stimuli responsive drug delivery system with special emphasis towards our reported stimuli responsive systems for cancer treatment.

scholarly journals pH-Sensitive Poly(β-amino ester)s Nanocarriers Facilitate the Inhibition of Drug Resistance in Breast Cancer Cells

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 952 ◽  
Author(s):  
Mengxue Zhou ◽  
Xingcai Zhang ◽  
Jin Xie ◽  
Rongxiang Qi ◽  
Huiru Lu ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Cancer Cells ◽  
Ph Sensitive ◽  
Amino Ester ◽  
Stimuli Responsive ◽  
Glycoprotein P ◽  
Cell Internalization ◽  
Promising Tool ◽  
Intracellular Drug Delivery ◽  
Mcf 7

Multidrug resistance (MDR) remains an unmet challenge in chemotherapy. Stimuli-responsive nanocarriers emerge as a promising tool to overcome MDR. Herein, pH-sensitive poly(β-amino ester)s polymers (PHP)-based micellar nanoparticles were synthesized for enhanced doxorubicin (DOX) delivery in drug resistant breast cancer MCF-7/ADR cells. DOX-loaded PHP micelles showed rapid cell-internalization and lysosomal escape in MCF-7/ADR cells. The cytotoxicity assays showed relatively higher cell inhibition of DOX-loaded PHP micelles than that of free DOX against MCF-7/ADR cells. Further mechanistic studies showed that PHP micelles were able to inhibit P-glycoprotein (P-gp) activity by lowering mitochondrial membrane potentials and ATP levels. These results suggested that the enhanced antitumor effect might be attributed to PHP-mediated lysosomal escape and drug efflux inhibition. Therefore, PHP would be a promising pH-responsive nanocarrier for enhanced intracellular drug delivery and overcoming MDR in cancer cells.

Sign in / Sign up

Export Citation Format

Share Document