Synthesis and Drug Release from a PH/Temperature Sensitive Bead of Poly(N-Acryloylglycinate) and Alginate

2011 ◽  
Vol 117-119 ◽  
pp. 1227-1230
Author(s):  
Kui Lin Deng ◽  
Ting Gao ◽  
Yu Bo Gou ◽  
Wei Wang ◽  
Peng Fei Zhang ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Temperature Sensitive ◽  
Polymer Content ◽  
In Vitro Drug Release ◽  
Buffer Solutions ◽  
Drug Delivery Carrier ◽  
Different Temperatures ◽  
Model Drug

In this paper, a new pH/temperature sensitive beads with core-shelled structure, composed of sodium alginate and poly(N-acryloylglycinate), were prepared using as drug delivery carrier. Selecting indomethacin as a model drug, in vitro drug release behaviors were investigated at different temperatures, phosphate buffer solutions (PBS) and polymer content. At pH=2.1, the release amount of indomethacin loaded in the beads was only 2.46% while this value approached to 95.23% in pH=7.4 PBS. In addition, the release rate of indomethacin at 37°C is much higher than at 18°C.

Drug Release Behaviors of a Novel Ph/Temperature Responsive Hydrogel with Jujube Cake-Like Structure

2010 ◽  
Vol 148-149 ◽  
pp. 994-997
Author(s):  
Kui Lin Deng ◽  
Qian Li ◽  
Xiao Hua Li ◽  
Yu Bo Gou ◽  
Li Rong Dong ◽  
...  
Keyword(s):  
Drug Release ◽  
Ph Value ◽  
Crosslinking Agent ◽  
Temperature Sensitive ◽  
In Vitro Drug Release ◽  
Temperature Responsive ◽  
Buffer Solutions ◽  
Different Temperatures ◽  
Model Drug

A novel jujube cake-like pH/temperature responsive hydrogel, as a drug delivery system, was prepared by two steps in this paper. The intelligent copolymer hydrogel (PME) was obtained from N-acryloylglycinate methyl ester (AGME) and N-acryloylglycinate ethyl ester (AGEE), using sodium laurate (SL) as an emulsifier and N, N '-methylenebisacrylamide (NMBA) as a crosslinking agent. Selecting indomethacin as a model drug, in vitro drug release behaviors were investigated at different temperatures, phosphate buffer solutions (PBS) and emulsifier content. The cumulative release of indomethacin from the pH/temperature sensitive hydrogel was apparently increased as the emulsifier content increased, the pH value increased and the temperature decreased. 48% indomethacin from the hydrogel PME was released in pH 7.4 PBS at 18 oC within 600 minutes, whereas only 17% indomethacin diffused into pH 2.1 PBS.

scholarly journals DESIGN AND EVALUATION OF INTRAGASTRIC BUOYANT TABLETS OF VENLAFAXINE HYDROCHLORIDE

2017 ◽  
Vol 10 (5) ◽  
pp. 166
Author(s):  
Parasuram Rajam Radhika ◽  
Nishala N ◽  
Kiruthika M ◽  
Sree Iswarya S
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Xanthan Gum ◽  
Hydroxypropyl Methylcellulose ◽  
Methyl Cellulose ◽  
In Vitro Drug Release ◽  
Weight Variation ◽  
Floating Drug Delivery ◽  
Venlafaxine Hydrochloride

Objective: The present study was undertaken to prolong the release of orally administered drug. The aim is to formulate, develop, and evaluate theintragastric buoyant tablets of venlafaxine hydrochloride, which releases the drug in a sustained manner over a period of 12 hrs. Different formulationswere formulated using the polymers Carbopol 934 P, xanthan gum, hydroxypropyl methylcellulose (HPMC K100M) with varying concentration ofdrug: Polymer ratio of 1:1, 1:1.5, 1:2, in which sodium bicarbonate acts as gas generating agent, and microcrystalline cellulose as a diluent.Methods: The tablets were prepared by direct compression and evaluated for tablet thickness, weight variation, tablet hardness, friability, in vitrobuoyancy test, in vitro drug release and Fourier transform infrared spectroscopy. Formulations were evaluated by floating time, floating lag time and in vitro drug release. Dissolution profiles were subjected for various kinetic treatments to analyze the release pattern of drug.Results: It was found that drug release depends on swelling, erosion, and diffusion, thus following the non-Fickian/anomalous type of diffusion.Formulation F8 was considered as an optimized formulation for gastro retentive floating tablet of venlafaxine hydrochloride. The optimizedformulation showed sustained drug release and remained buoyant on the surface of the medium for more than 12 hrs. As the concentration of HPMCK100M increases in the formulation the drug release rate was found to be decreased. The optimized formulation was subjected for the stability studiesand was found to be stable as no significant change was observed in various evaluated parameters of the formulation.Conclusion: It can be concluded that floating drug delivery system of venlafaxine hydrochloride can be successfully formulated as an approach toincrease gastric residence time, thereby improving its bioavailability.Keywords: Venlafaxine hydrochloride, Intragastric buoyant, Floating drug delivery systems, Hydroxypropyl methyl cellulose K100M, Carbopol 934 P,Xanthan gum.

Evaluation of clay-ionene nanocomposite carriers for controlled drug delivery: Synthesis, in vitro drug release, and kinetics

2019 ◽  
Vol 225 ◽  
pp. 122-132 ◽  
Author(s):  
Hany El-Hamshary ◽  
Mohamed H. El-Newehy ◽  
Meera Moydeen Abdulhameed ◽  
Ayman El-Faham ◽  
Abeer S. Elsherbiny
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Controlled Drug Delivery ◽  
In Vitro Drug Release

Drug Release Behaviors of a pH/Temperature Sensitive Hydrogel Bead with Core-Shelled Structure

2010 ◽  
Vol 148-149 ◽  
pp. 1427-1430 ◽  
Author(s):  
Kui Lin Deng ◽  
Li Rong Dong ◽  
Yu E Shi ◽  
Yu Bo Gou ◽  
Qian Li ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Phosphate Buffer Solution ◽  
Temperature Sensitive ◽  
Buffer Solution ◽  
Hydrogel Bead ◽  
The Core ◽  
Drug Delivery Carrier ◽  
Temperature Sensitive Hydrogel ◽  
Biomedical Fields

As a drug delivery carrier, a novel pH/temperature sensitive bead (pTSB) with core-shelled structure from poly(N-acryloylglycine) (PAG), copoly(N-acryloylglycine methyl este and N-acryloylglycine ethyl ester) was prepared by two steps. In pH=7.4 phosphate buffer solution (PBS), the cumulative release amount of indomethacin loaded in the pTSB was about 60.1 % within 500 mins, but this value only reached to 22.3 % in pH=2.1 PBS. The release behaviors of indomethacin from pTSB also exhibited a remarkable dependence on PAG content in the core. Additionally, the release rate of indomethacin was much faster at 18 oC than that at 37 oC due to the temperature sensitivity of poly(N-acryloylglycinates). The experimental results indicate that pTSB seems to have a potential application in the drug release system controlled via pH or temperature in the biomedical fields.

A Smart Drug Delivery System Based on Thermo-Responsive Polymer Gated Au NRs@SiO2 Nano-Platform

2021 ◽  
Vol 16 (7) ◽  
pp. 1029-1036
Author(s):  
Hongzhu Wang ◽  
Mengxun Chen ◽  
Liping Song ◽  
Youju Huang
Keyword(s):  
Drug Delivery ◽  
Block Copolymer ◽  
Drug Release ◽  
Drug Delivery System ◽  
Delivery System ◽  
Photothermal Therapy ◽  
Drug Loading ◽  
Temperature Sensitive

A key challenge for nanoparticles-based drug delivery system is to achieve manageable drug release in tumour cell. In this study, a versatile system combining photothermal therapy and controllable drug release for tumour cells using temperature-sensitive block copolymer coupled Au NRs@SiO2 is reported. While the Au NRs serve as hyperthermal agent and the mesoporous silica was used to improve the drug loading and decrease biotoxicity. The block copolymer acted as “gatekeeper” to regulate the release of model drug (Doxorubicin hydrochloride, DOX). Through in vivo and in vitro experiments, we achieved the truly controllable drug release and photothermal therapy with the collaborative effect of the three constituents of the nanocomposites. The reported nanocomposites pave the way to high-performance controllable drug release and photothermal therapy system.

Preparation and Characterization of Biopolymeric Nanoparticles as Drug Delivery Vehicles

2017 ◽  
pp. 225-246
Author(s):  
Sai S. Sagiri ◽  
Suraj K. Nayak ◽  
S. Lakshmi ◽  
Kunal Pal
Keyword(s):  
Drug Delivery ◽  
Salicylic Acid ◽  
Drug Release ◽  
Chitosan Nanoparticles ◽  
Xrd Analysis ◽  
Gelatin Nanoparticles ◽  
Drug Delivery Vehicles ◽  
Model Drug ◽  
Bioactive Agents

In recent years, the use of biopolymeric nanoparticles as vehicles for drug delivery has increased exponentially. In the present study, chitosan and gelatin nanoparticles were prepared by ionic gelation and desolvation methods, respectively. Salicylic acid was used as the model drug. The nanoparticles were characterized using SEM, XRD analysis and FTIR spectrophotometric studies. In vitro drug release experiments were carried out to understand the mechanism of drug release. SEM micrographs showed the formation of spherical nanoparticles. XRD studies indicated a higher crystalline nature of the chitosan nanoparticles as compared to the gelatin nanoparticles. FTIR studies indicated the presence of salicylic acid within the drug- loaded nanoparticles. Drug release studies indicated that the developed nanoparticles may be used as carriers for various bioactive agents.

scholarly journals Assessment of Intracellular Delivery Potential of Novel Sustainable Poly(δ-decalactone)-Based Micelles

Pharmaceutics ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 726
Author(s):  
Kuldeep Kumar Bansal ◽  
Ezgi Özliseli ◽  
Gaurav Kumar Saraogi ◽  
Jessica M. Rosenholm
Keyword(s):  
Drug Delivery ◽  
Folic Acid ◽  
Folate Receptor ◽  
In Vitro Cytotoxicity ◽  
Uptake Efficiency ◽  
Drug Delivery Carrier ◽  
Intracellular Drug Delivery ◽  
Copolymer Micelles ◽  
Model Drug

Biodegradable polymers from renewable resources have attracted much attention in recent years within the biomedical field. Lately, poly(δ-decalactone) based copolymer micelles have emerged as a potential drug delivery carrier material as a sustainable alternative to fossil-based polymers. However, their intracellular drug delivery potential is not yet investigated and therefore, in this work, we report on the synthesis and cellular uptake efficiency of poly(δ-decalactone) based micelles with or without a targeting ligand. Folic acid was chosen as a model targeting ligand and Rhodamine B as a fluorescent tracer to demonstrate the straightforward functionalisation aspect of copolymers. The synthesis of block copolymers was accomplished by a combination of facile ring-opening polymerisation and click chemistry to retain the structure uniformity. The presence of folic acid on the surface of micelles with diameter ~150 nm upsurge the uptake efficiency by 1.6 fold on folate receptor overexpressing MDA-MB-231 cells indicating the attainment of targeting using ligand functionality. The drug delivery capability of these carriers was ascertained by using docetaxel as a model drug, whereby the in vitro cytotoxicity of the drug was significantly increased after incorporation in micelles 48 h post incubation. We have also investigated the possible endocytosis route of non-targeted micelles and found that caveolae-mediated endocytosis was the preferred route of uptake. This work strengthens the prospect of using novel bio-based poly(δ-decalactone) micelles as efficient multifunctional drug delivery nanocarriers towards medical applications.

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