scholarly journals Carbon-Based Magnetic Nanocarrier for Controlled Drug Release: A Green Synthesis Approach

2018 ◽  
Vol 5 (1) ◽  
pp. 1 ◽  
Author(s):  
Jessica Oliveira ◽  
Raquel Rodrigues ◽  
Lillian Barros ◽  
Isabel Ferreira ◽  
Luís Marchesi ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Magnetic Nanoparticles ◽  
Drug Release ◽  
Phosphate Buffer ◽  
Colloidal Stability ◽  
Ph Dependence ◽  
Phosphate Buffer Solution ◽  
Controlled Drug Release ◽  
Buffer Solution ◽  
Carbon Based

In this study, hydrophilic magnetic nanoparticles were synthesized by green routes using a methanolic extract of Rubus ulmifolius Schott flowers. The prepared magnetic nanoparticles were coated with carbon-based shell for drug delivery application. The nanocomposites were further chemically functionalized with nitric acid and, sequentially, with Pluronic® F68 (CMNPs-plur) to enhance their colloidal stability. The resulting material was dispersed in phosphate buffer solution at pH 7.4 to study the Doxorubicin loading. After shaking for 48 h, 99.13% of the drug was loaded by the nanocomposites. Subsequently, the drug release was studied in different working phosphate buffer solutions (i.e., PB pH 4.5, pH 6.0 and pH 7.4) to determine the efficiency of the synthesized material for drug delivery as pH-dependent drug nanocarrier. The results have shown a drug release quantity 18% higher in mimicking tumor environment than in the physiological one. Therefore, this study demonstrates the ability of CMNPs-plur to release a drug with pH dependence, which could be used in the future for the treatment of cancer "in situ" by means of controlled 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.

Synthesis of N-Carboxymethyl Chitosan Beads for Controlled Drug Delivery Applications

2006 ◽  
Vol 514-516 ◽  
pp. 1015-1019 ◽  
Author(s):  
Rangasamy Jayakumar ◽  
Rui L. Reis ◽  
João F. Mano
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Phosphate Buffer Solution ◽  
Controlled Drug Delivery ◽  
Gastric Fluid ◽  
Carboxymethyl Chitosan ◽  
Water Soluble ◽  
Buffer Solution ◽  
Chitosan Beads

N-Carboxymethyl chitosan (NCMC) is a water soluble derivative of chitosan. The NCMC beads were prepared by using ionotropic gelation process with the counter polyanion tripolyphoshate at pH 4.0 and characterized by scanning electron microscopy. The swelling behavior of the beads at different time intervals was monitored at different pH conditions. The in vitro drug release behavior in various pH solutions was studied using indomethacin as a model drug with two different concentrations (0.3 and 0.6% w/w). The release percent of indomethacin from NCMC beads was found to increase with increasing of pH in phosphate buffer solution medium due to the ionization of carboxymethyl group and high solubility of indomethacin in alkaline medium. These results indicated that the NCMC beads are useful for controlled drug delivery systems through oral administration by avoiding the drug release in the highly acidic gastric fluid region of the stomach.

Drug Release from a pH/Temperature Sensitive Hydrogel Bead of Poly(Lysine Methyl Ester-Diacetoxy Tartaric Acid) and Sodium Alginate

2013 ◽  
Vol 711 ◽  
pp. 14-17
Author(s):  
Kui Lin Deng ◽  
Hui Juan Shen ◽  
Shu Liang Wang ◽  
Meng Wang ◽  
Xin Ma ◽  
...  
Keyword(s):  
Methyl Ester ◽  
Drug Release ◽  
Sodium Alginate ◽  
Tartaric Acid ◽  
Phosphate Buffer Solution ◽  
Controlled Drug Release ◽  
Temperature Sensitive ◽  
Condensation Polymerization ◽  
Buffer Solution ◽  
Model Drug

In this study, a pH/temperature sensitive polymeric hydrogel from poly (lysine methyl ester-diacetoxy tartaric acid) and sodium alginate (PLMD-SA) was prepared via the condensation polymerization. Using indomethacin as the model drug, the controlled drug-release from the resulting pH/temperature sensitive PLMD-SA was evaluated as functions of pH, PLMD content and temperature by UV spectrophotometer. It was found that the release amount of indomethacin in pH=7.4 phosphate buffer solution (PBS) was evidently higher than in pH=2.3 PBS.

Study of pH-Responsive and Polyethylene Glycol-Modified Doxorubicin-Loaded Mesoporous Silica Nanoparticles for Drug Delivery

2020 ◽  
Vol 20 (10) ◽  
pp. 5997-6006
Author(s):  
Yujie Qin ◽  
Xiaoqian Shan ◽  
Yu Han ◽  
Hang Jin ◽  
Ying Gao
Keyword(s):  
Drug Delivery ◽  
Polyethylene Glycol ◽  
Drug Release ◽  
Mesoporous Silica ◽  
Drug Delivery System ◽  
Delivery System ◽  
Phosphate Buffer ◽  
Drug Loading ◽  
Phosphate Buffer Solution ◽  
Tumor Cell Death

Tumor-targeted drug delivery systems represent challenging and widely investigated strategies to enhance cancer chemotherapy. In this study, we introduce a novel high-hydrophilic mesoporous silica nanoparticle system with a pH-sensitive drug release. The resultant composite nanoparticles appear as spheres of uniform size (450±25 nm) with a porous structure, which enables a high drug-loading ratio. Through modification of chitosan and polyethylene glycol monomethyl ether, the modified mesoporous silica was non-toxic to normal cells, but effective at inducing tumor cell death. With regard to the characteristics of drug release, the modified mesoporous silica clearly displayed a pH-stimulated release of the model drug doxorubicin hydrochloride in an acidic phosphate buffer solution (pH 4.0 and 6.0). The release was much greater than that observed in neutral or alkaline phosphate buffer solutions (pH 7.3 and 8.0). Furthermore, the release behavior was in accordance with the Higuchi model, indicating that this modified mesoporous silica drug delivery system can exhibit controlled release. The above results imply that the modified mesoporous silica is an effective drug delivery system for cancer therapy.

scholarly journals EFFECTS OF VISCOELASTIC PROPERTIES AND HYDRATION KINETIC ON DRUG RELEASE FROM THE TABLET OF DICLOFENAC SODIUM BASED ON POLY (SODIUM ACRYLATE)-GRAFTED-GELLAN MATRIX

2019 ◽  
Vol 9 (4-A) ◽  
pp. 1-8
Author(s):  
Gouranga Nandi
Keyword(s):  
Drug Release ◽  
Phosphate Buffer ◽  
Diclofenac Sodium ◽  
Phosphate Buffer Solution ◽  
Fickian Diffusion ◽  
Sodium Acrylate ◽  
Release Mechanism ◽  
Drug Release Profile ◽  
Buffer Solution ◽  
Solution Ph

Investigation of the effects of viscoelasticity and hydration kinetic on the drug release behavior from the poly (sodium acrylate)-grafted-gellan matrix (PSAc-g-GG) was the main objective of this study. At first, poly (acrylic acid)-grafted-gellan was treated with 0.05M NaOH to obtain poly (sodium acrylate)-grafted-gellan followed by its purification and subsequent lyophilicity study and viscoelastic study on PSAc-g-GG with different degree of grafting. The study revealed that the degree of grafting greatly affects the viscoelastic and rheologic characteristics of the copolymer, which further affect the drug release profile from the polymeric matrix. The  copolymer with highest grafting (626.3%) exhibited much higher starting % strain (17.79%), stress (53.7 Pa) for structural breakdown at Gꞌ = Gꞌꞌ (214.4 Pa), higher storage modulus (G’), much greater values of complex viscosity (11.5 Pa.s) and cross-over point (Gꞌ = Gꞌꞌ =271.65 Pa) compared to that of the batch of copolymer with lower grafting. The water uptake index (%WE) was found to be directly proportional to the percentage grafting (%G), whereas the batches with higher grafting  revealed lower initial swelling rate representing its inversely proportional relation to %grafting in case of 0.1N HCl acid. Equilibrium swelling and hydration were also found to be proportional to % grafting.  The similar effect was observed in phosphate buffer solution (pH 6.8) with an exception that the degree of the swelling parameters obtained from phosphate buffer was very much greater compared to that found in 0.1N HCl. PSAc-g-GG exhibited extended drug release over a period of 10 hours with the drug release mechanism based on Case-1 Fickian diffusion or square root of time kinetic. The study also exhibited the usefulness of viscoelastic and swelling study in order to identify the effects of the degree of grafting on the drug release.

A pH-Sensitive Poly (2-(Acryloyloxy) Propanoic Acid) Hydrogel and its Drug Release Behaviors

2012 ◽  
Vol 455-456 ◽  
pp. 901-906
Author(s):  
Kui Lin Deng ◽  
Chun Yuan Huang ◽  
Xiao Bo Ren ◽  
Yu Bo Gou ◽  
Hai Bin Zhong ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Salicylic Acid ◽  
Drug Release ◽  
Phosphate Buffer Solution ◽  
Ph Sensitive ◽  
Propanoic Acid ◽  
Buffer Solution ◽  
H Nmr ◽  
Model Drug

A novel pH-sensitive poly (2-(acryloyloxy) propanoic acid) hydrogel (PAPA) synthesized from lactic acid by radical polymerization has been investigated in this work. The structure of prepared monomer2-(acryloyloxy) propanoic acid) (APA) has been characterized by FTIR and1H-NMR measurements. PAPA hydrogel demonstrated an obvious pH sensitivity in its swelling in the range of 4-7 pH of phosphate buffer solution (PBS). The rapid response of the hydrogel makes it suitable for drug delivery application. Here, salicylic acid (SA) selected as a model drug, thein-vitrodrug release as a function of pH and temperature was studied systematically. The cumulative release of salicylic acid reached up to 86.6% in pH=7.4 PBS at 37.0°C within 550min. In pH=2.1 PBS, however, only 26.6% drug was released from the pH-sensitive PAPA on the same conditions.

Nanostructured Ketorolac-Tromethamine/MCF: Synthesis, Characterization and Application in Drug Release System

2018 ◽  
Vol 14 (5) ◽  
pp. 432-439 ◽  
Author(s):  
Juliana M. Juarez ◽  
Jorgelina Cussa ◽  
Marcos B. Gomez Costa ◽  
Oscar A. Anunziata
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Therapeutic Efficacy ◽  
Drug Delivery Systems ◽  
Controlled Drug Release ◽  
Delivery Systems ◽  
The Body ◽  
Fickian Diffusion ◽  
Ketorolac Tromethamine

Background: Controlled drug delivery systems can maintain the concentration of drugs in the exact sites of the body within the optimum range and below the toxicity threshold, improving therapeutic efficacy and reducing toxicity. Mesostructured Cellular Foam (MCF) material is a new promising host for drug delivery systems due to high biocompatibility, in vivo biodegradability and low toxicity. Methods: Ketorolac-Tromethamine/MCF composite was synthesized. The material synthesis and loading of ketorolac-tromethamine into MCF pores were successful as shown by XRD, FTIR, TGA, TEM and textural analyses. Results: We obtained promising results for controlled drug release using the novel MCF material. The application of these materials in KETO release is innovative, achieving an initial high release rate and then maintaining a constant rate at high times. This allows keeping drug concentration within the range of therapeutic efficacy, being highly applicable for the treatment of diseases that need a rapid response. The release of KETO/MCF was compared with other containers of KETO (KETO/SBA-15) and commercial tablets. Conclusion: The best model to fit experimental data was Ritger-Peppas equation. Other models used in this work could not properly explain the controlled drug release of this material. The predominant release of KETO from MCF was non-Fickian diffusion.

NIR responsive AuNRs/pNIPAM/PEGDA inverse opal hydrogel microcarriers for controllable drug delivery

2021 ◽  
Author(s):  
Lingzi Liu ◽  
Xiaoyan Sun ◽  
Baofen Ye ◽  
Zhengyu Yan
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Delivery System ◽  
Gold Nanorods ◽  
Controlled Drug Release ◽  
Inverse Opal

Particle-based delivery system has merged as a powerful platform in controlled drug release. The present study developed a new inverse opal hydrogel microcarriers system composed of gold nanorods (AuNRs) for...

A general method to greatly enhance ultrasound-responsiveness for common polymeric assemblies

2020 ◽  
Vol 11 (19) ◽  
pp. 3296-3304
Author(s):  
Jinkang Dou ◽  
Ruiqi Yang ◽  
Kun Du ◽  
Li Jiang ◽  
Xiayun Huang ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Controlled Drug Delivery ◽  
Controlled Drug Release ◽  
Promising Technique ◽  
Polymeric Assemblies ◽  
General Method

Ultrasound-controlled drug release is a very promising technique for controlled drug delivery due to the unique advantages of ultrasound as the stimulus.

Bioceramic Hydroxyapatite Granules for Purification of Biotechnological Products

2011 ◽  
Vol 284-286 ◽  
pp. 1764-1769 ◽  
Author(s):  
Vitalijs Lakevics ◽  
Janis Locs ◽  
Dagnija Loca ◽  
Valentina Stepanova ◽  
Liga Berzina-Cimdina ◽  
...  
Keyword(s):  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Phosphate Buffer ◽  
Bovine Serum ◽  
Phosphate Buffer Solution ◽  
Sorption Process ◽  
Buffer Solution ◽  
Ph Values ◽  
Bovine Serum Albumin Adsorption ◽  
Albumin Adsorption

Sorption experiments of bovine serum albumin (BSA) on hydroxyapatite (HAp) ceramic granules, prepared at three temperatures 900°C, 1000°C and 1150°C were performed at room temperature 18,6 °C and phosphate buffer, pH 5,83; 6.38 and 7,39. Thermal treatment contributed to the decrease of bovine serum albumin immobilization indicating that sorption process depended on HAp ceramics specific surface area and pH values of phosphate buffer solution. However, it was confirmed that granule size was also an important parameter for bovine serum albumin adsorption. As a result of these experiments, the most appropriate adsorption conditions and phosphate buffer pH values influence on to BSA sorption were analyzed.

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