GSH-responsive polymeric micelles based on the thio–ene reaction for controlled drug release

RSC Advances ◽  
2016 ◽  
Vol 6 (84) ◽  
pp. 80896-80904 ◽  
Author(s):  
Hongliang Cao ◽  
Huajie Song ◽  
Debiao Xie ◽  
Chao Chen ◽  
Xin Chen ◽  
...  
Keyword(s):  
Drug Release ◽  
Polymeric Micelles ◽  
Drug Carrier ◽  
Controlled Drug Release ◽  
Ene Reaction

A glutathione (GSH) responsive drug carrier is prepared that relies on the thio–ene reaction of olefinic bonds and GSH.

scholarly journals Preparation and Drug-Release Kinetics of Porous Poly(L-lactic acid)/Rifampicin Blend Particles

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Takashi Sasaki ◽  
Hiroaki Matsuura ◽  
Kazuki Tanaka
Keyword(s):  
Lactic Acid ◽  
Drug Release ◽  
Release Kinetics ◽  
Drug Carrier ◽  
Controlled Drug Release ◽  
Solution Concentration ◽  
Porous Polymer ◽  
High Porosity ◽  
Original Solution ◽  
Kinetics Of

Porous polymer spheres are promising materials as carriers for controlled drug release. As a new drug-carrier material, blend particles composed of poly(L-lactic acid) (PLLA) and rifampicin were developed using the freeze-drying technique. The blend particles exhibit high porosity with a specific surface area of 10–40 m2 g−1. Both the size and porosity of the particles depend on the concentration of the original solution and on the method of freezing. With respect to the latter, we used the drop method (pouring the original solution dropwise into liquid nitrogen) and the spray method (freezing a mist of the original solution). The release kinetics of rifampicin from the blend particles into water depends significantly on the morphology of the blend particles. The results show that the release rate can be controlled to a great extent by tuning the size and porosity of the blend particles, both of which are varied by parameters such as the solution concentration and the method of freezing.

Multi-Activated Polymeric Micelles with Charge-Conversion and ROS-Controlled Drug Release for Efficient Cancer Therapy

2017 ◽  
Vol 13 (8) ◽  
pp. 946-959 ◽  
Author(s):  
Changzhen Sun ◽  
Yan Liang ◽  
Mingying Zhao ◽  
Na Hao ◽  
Long Xu ◽  
...  
Keyword(s):  
Cancer Therapy ◽  
Drug Release ◽  
Polymeric Micelles ◽  
Controlled Drug Release

Thermally Responsive Hydrogel Blends: A General Drug Carrier Model for Controlled Drug Release

2015 ◽  
Vol 54 (25) ◽  
pp. 7376-7380 ◽  
Author(s):  
Chongbo Ma ◽  
Ye Shi ◽  
Danilo A. Pena ◽  
Lele Peng ◽  
Guihua Yu
Keyword(s):  
Drug Release ◽  
Drug Carrier ◽  
Controlled Drug Release ◽  
Carrier Model ◽  
Thermally Responsive ◽  
General Drug

Thermally Responsive Hydrogel Blends: A General Drug Carrier Model for Controlled Drug Release

2015 ◽  
Vol 127 (25) ◽  
pp. 7484-7488 ◽  
Author(s):  
Chongbo Ma ◽  
Ye Shi ◽  
Danilo A. Pena ◽  
Lele Peng ◽  
Guihua Yu
Keyword(s):  
Drug Release ◽  
Drug Carrier ◽  
Controlled Drug Release ◽  
Carrier Model ◽  
Thermally Responsive ◽  
General Drug

Synthesis and characterization of an amphiphilic methoxy poly(l-lactide)-block-poly(glycidylmethacrylate) copolymer as a drug nanocarrier

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Massoumeh Bagheri ◽  
Forough Motirasoul
Keyword(s):  
Diblock Copolymer ◽  
Ring Opening ◽  
Polymeric Micelles ◽  
Drug Carrier ◽  
Controlled Drug Release ◽  
Transmission Electron ◽  
Model Drug ◽  
Dialysis Bag

AbstractPresent research is a preliminary report on the amphiphilic diblock copolymer (mPLA-b-PGMA) comprising hydrophobic methoxy poly(L-lactide) (mPLA) and hydrophilic poly(glycidyl methacrylate) (PGMA) segments was used as a promising drug carrier. Diblock copolymer was synthesized via ring opening polymerization (ROP) and atom transfer radical polymerization (ATRP) methods. Methanol first initiated ROP of L-lactide in the presence of tin(II)bis(2-ethylhexanoate) (Sn(oct)2) as a catalyst. The resulting monohydroxyl-terminated polylactic acid (mPLA) was subsequently converted to a bromine-ended macroinitiator (mPLA-Br) by esterification with 2-bromisobutyryl bromide. The copolymer mPLA-b-PGMA was synthesized in a subsequent ATRP of GMA. The obtained polymers were characterized by means of 1H NMR, FTIR, DSC and TGA. The copolymer mPLA-b- PGMA self-assembled into nanoscale micelles in aqueous solutions, as investigated by transmission electron microscopy (TEM) and dynamic light scattering (DLS). The TEM image of polymeric micelles showed that the micelles were spherical in shape and that their diameters were in the range of 80-140 nm. Then by using the naproxen as a hydrophobic model drug, the drug-loaded micelles with 81.18 % loading efficiency and 16.24 % loading capacity were prepared. Moreover, in vitro release study of naproxen was performed using dialysis bag in phosphate-buffered solution at 37°C and pH at 7.4. Accordingly, these polymeric micelles may provide as an effective drug carrier for controlled drug release.

Controlled Drug Release from Biodegradable Bone Fillers

2012 ◽  
Vol 430-432 ◽  
pp. 677-680
Author(s):  
Yong Li Zhang ◽  
Chen Xu ◽  
Zhi Ming Sun ◽  
Mao Cong Yi ◽  
Yu Liu ◽  
...  
Keyword(s):  
Drug Release ◽  
Release Rate ◽  
Drug Carrier ◽  
Controlled Drug Release ◽  
Drug Release Rate ◽  
Rapid Degradation ◽  
Bone Filler ◽  
Structure Of Coatings

Plaster of Pairs is a common used implanting material. However, its rapid degradation or drug releasing rate as a bone filler or drug carrier does not meet the requirement of clinic application. In this paper, plaster of Pairs bone fillers loaded with drug was prepared and their degradation and the drug release period were adjusted by coating their surface with polymers. The results show that the structure of coatings can effectively control the degradation period of the bone fillers, and consequently the drug release rate.

scholarly journals Tris (2-aminoethyl) Amine Functionalized Nanoporous Silica SBA-15 as a Potential Drug Carrier for Citalopram

2019 ◽  
Vol 4 (4) ◽  
pp. 155-162
Author(s):  
Fatemeh Dalayi ◽  
Leila Hajiaghababaei ◽  
Alireza Badiei ◽  
Elham Boorboor Azimi ◽  
Mohammad Reza Ganjali ◽  
...  
Keyword(s):  
Drug Release ◽  
Release Rate ◽  
Ph Value ◽  
Drug Carrier ◽  
Drug Loading ◽  
Controlled Drug Release ◽  
Nanoporous Silica ◽  
Release Process ◽  
Functionalized Mesoporous Silica ◽  
Amine Functionalized

Introduction: Ordered nanoporous silica such as SBA-15 has a great potential for application in controlled drug release systems. Chemical modification of the silanol groups of SBA-15 allows better control over drug loading and release. Therefore, tris(2-aminoethyl) amine-functionalized mesoporous silica SBA-15 was evaluated as a potential carrier for the delivery of citalopram. Methods: Tris (2-aminoethyl) amine-functionalized SBA-15 was synthesized and characterized by various methods. Citalopram was loaded on the functionalized SBA-15 and drug release into simulated body fluid (SBF) solution and phosphate buffers was investigated. Results: The optimal condition for loading of the citalopram was obtained at pH = 9 after stirring for 5 minutes. The release profile of citalopram was monitored in phosphate buffers with three different pH values of 5, 7, and 8. A faster release rate at lower pH value was observed, suggesting a weaker interaction because of the protonation of the amino group of the functionalized SBA15. The average release rate of citalopram from each gram of functionalized SBA-15 was 12 µg h-1 in the SBF. Conclusion: The results showed that loading amount and release rate of citalopram depended on pH value and the release process showed a very slow release pattern. Therefore, tris (2-aminoethyl) amine-functionalized SBA-15 is a suitable carrier for controlled release of citalopram and has a great potential for disease therapy.

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