Cell Protective, ABC Triblock Polymer-Based Thermoresponsive Hydrogels with ROS-Triggered Degradation and Drug Release

2014 ◽  
Vol 136 (42) ◽  
pp. 14896-14902 ◽  
Author(s):  
Mukesh K. Gupta ◽  
John R. Martin ◽  
Thomas A. Werfel ◽  
Tianwei Shen ◽  
Jonathan M. Page ◽  
...  
Keyword(s):  
Drug Release ◽  
Triblock Polymer ◽  
Thermoresponsive Hydrogels

Thermoresponsive hydrogels physically crosslinked with magnetically modified LAPONITE® nanoparticles

Soft Matter ◽  
2020 ◽  
Vol 16 (24) ◽  
pp. 5689-5701 ◽  
Author(s):  
Olena Goncharuk ◽  
Yurii Samchenko ◽  
Liudmyla Kernosenko ◽  
Olena Korotych ◽  
Tetiana Poltoratska ◽  
...  
Keyword(s):  
Drug Release ◽  
Magnetite Nanoparticles ◽  
P Application ◽  
Hydrogel Nanocomposites ◽  
Thermoresponsive Hydrogels ◽  
Physically Crosslinked

Application of LAPONITE®/magnetite nanoparticles to physically crosslink poly(N-isopropylacrylamide) yields hierarchically structured hydrogel nanocomposites which can be used as magnetically controlled carriers with thermo-induced drug release.

scholarly journals Linear-g-hyperbranched and cyclodextrin-based amphiphilic block copolymer as a multifunctional nanocarrier

2014 ◽  
Vol 10 ◽  
pp. 2696-2703 ◽  
Author(s):  
Yamei Zhao ◽  
Wei Tian ◽  
Guang Yang ◽  
Xiaodong Fan
Keyword(s):  
Drug Release ◽  
Drug Loading ◽  
Controlled Drug Release ◽  
Release Mechanism ◽  
The Novel ◽  
Reversible Addition ◽  
Diagnostic Agents ◽  
Triblock Polymer ◽  
One Step ◽  
Multifunctional Nanocarriers

In this paper, a novel, multifunctional polymer nanocarrier was designed to provide adequate volume for high drug loading, to afford a multiregion encapsulation ability, and to achieve controlled drug release. An amphiphilic, triblock polymer (ABC) with hyperbranched polycarbonsilane (HBPCSi) and β-cyclodextrin (β-CD) moieties were first synthesized by the combination of a two-step reversible addition-fragmentation transfer polymerization into a pseudo-one-step hydrosilylation and quaternization reaction. The ABC then self-assembled into stable micelles with a core–shell structure in aqueous solution. These resulting micelles are multifunctional nanocarriers which possess higher drug loading capability due to the introduction of HBPCSi segments and β-CD moieties, and exhibit controlled drug release based on the diffusion release mechanism. The novel multifunctional nanocarrier may be applicable to produce highly efficient and specialized delivery systems for drugs, genes, and diagnostic agents.

Formulation, Design and Development of Niosome Based Topical Gel for Skin Cancer

2017 ◽  
Vol 2 (3) ◽  
Keyword(s):  
Skin Cancer ◽  
Drug Release ◽  
Hemorrhagic Cystitis ◽  
The Body ◽  
Cancer Drug ◽  
Inversion Method ◽  
Body Parts ◽  
Basal Cells ◽  
Formulation Design ◽  
Topical Gel

Melanoma is the most dangerous type of skin cancer in which mostly damaged unpaired DNA starts mutating abnormally and staged an unprecedented proliferation of epithelial skin to form a malignant tumor. In epidemics of skin, pigment-forming melanocytes of basal cells start depleting and form uneven black or brown moles. Melanoma can further spread all over the body parts and could become hard to detect. In USA Melanoma kills an estimated 10,130 people annually. This challenge can be succumbed by using the certain anti-cancer drug. In this study design, cyclophosphamide were used as a model drug. But it has own limitation like mild to moderate use may cause severe cytopenia, hemorrhagic cystitis, neutropenia, alopecia and GI disturbance. This is a promising challenge, which is caused due to the increasing in plasma drug concentration above therapeutic level and due to no rate limiting steps involved in formulation design. In this study, we tried to modify drug release up to threefold and extended the release of drug by preparing and designing niosome based topical gel. In the presence of Dichloromethane, Span60 and cholesterol, the initial niosomes were prepared using vacuum evaporator. The optimum percentage drug entrapment efficacy, zeta potential, particle size was found to be 72.16%, 6.19mV, 1.67µm.Prepared niosomes were further characterized using TEM analyzer. The optimum batch of niosomes was selected and incorporated into topical gel preparation. Cold inversion method and Poloxamer -188 and HPMC as core polymers, were used to prepare cyclophosphamide niosome based topical gel. The formula was designed using Design expert 7.0.0 software and Box-Behnken Design model was selected. Almost all the evaluation parameters were studied and reported. The MTT shows good % cell growth inhibition by prepared niosome based gel against of A375 cell line. The drug release was extended up to 20th hours. Further as per ICH Q1A (R2), guideline 6 month stability studies were performed. The results were satisfactory and indicating a good formulation approach design was achieved for Melanoma treatment.

Effects of release modifier on Carvedilol release from Kollidon SR based matrix

2012 ◽  
Vol 1 (8) ◽  
pp. 186 ◽  
Author(s):  
Urmi Das ◽  
Mohammad Salim Hossain
Keyword(s):  
Drug Release ◽  
Sustained Release ◽  
Microcrystalline Cellulose ◽  
Matrix Tablets ◽  
Dissolution Time ◽  
Release Mechanism ◽  
Matrix Tablet ◽  
Weight Variation ◽  
The Matrix ◽  
Tablet Formulations

<p>Sustained release Carvedilol matrix tablets constituting Kollidon SR were developed in this study in an attempt to investigate the effect of release modifiers on the release profile of Carvedilol from matrix. Three matrix tablet formulations were prepared by direct compression of Kollidon SR in combination with release modifier (HPMC and Microcrystalline Cellulose) and magnesium stearate. Tablets containing only Kollidon SR with the active ingredient demonstrated a rapid rate of drug release. Incorporation of HPMC in the matrix tablet prolonged the release of drug but incorporation of Microcrystalline Cellulose showed superimposable release pattern with an initial burst effect as confirmed by mean dissolution time and Higuchi release rate data. After 7 hours of dissolution, Carvedilol release from the matrix systems were 91.42%, 83.41%, from formulation F1 and F2 respectively. Formulation F3 exhibited 100 % release at 4 hours. All the tablet formulations showed acceptable pharmaco-technical properties and complied with the in-house specifications for tablet weight variation, friability, hardness, thickness, and diameter. Prepared tablets also showed sustained release property for carvedilol. The drug release mechanism from the matrix tablets of F1 and F2 was found to be followed by Fickian and F3 by Non-Fickian mechanism.</p><p>DOI: <a href="http://dx.doi.org/10.3329/icpj.v1i8.11095">http://dx.doi.org/10.3329/icpj.v1i8.11095</a></p> <p>International Current Pharmaceutical Journal 2012, 1(8): 186-192</p>

The Improvement of Paclitaxel Cytotoxicity using Nanocellulose based Nature Resources

2019 ◽  
Vol 1 (1) ◽  
pp. 7
Author(s):  
R Nahrowi ◽  
A Setiawan ◽  
Noviany Noviany ◽  
I Sukmana ◽  
S D Yuwono
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Natural Resources ◽  
Cell Viability ◽  
Cancer Cells ◽  
Drug Delivery System ◽  
Target Cell ◽  
Mitotic Cycle ◽  
Potential Sources ◽  
Local Accumulation

Paclitaxel is one of the cancer drugs that often used. These drug kills cancer cells byinhibiting mitotic cycle. The efficiency of paclitaxel is increased by the use ofnanomaterials as a carrier of paclitaxel. Nanomaterials can enhance encapsulationefficiency, improve the drug release to the target cell following nanomaterialdegradation, and improve local accumulation of drug in the cell through endocytosisreceptor. Nanomaterial that often used forencapsulation of paclitaxel is a polymerderived from natural resources such as cellulose. The advantages of cellulose as acarrier of paclitaxel are nontoxic, biodegradable, and very abundant from varioussources. One of the potential sources of cellulose for drug delivery system is cassavabaggase.Keywords: Paclitaxel, encapsulation, cell viability, nanocellulose

Acyclovir Loaded Solid Lipid Nanoparticle Based Cream: A Novel Drug Delivery System

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
EL- Assal I. A. ◽  
Retnowati .
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Antiviral Agent ◽  
Study Drug ◽  
Particle Size Analysis ◽  
Stability Study ◽  
Size Analysis ◽  
Solid Lipid ◽  
Dermal Delivery

Objective of the present investigation was enthused by the possibility to develop solid lipid nanoparticles (SLNs) of hydrophilic drug acyclovir. Also study vitro and vivo drug delivery. Methods: Drug loaded SLNs (ACV-SLNs) were prepared by high pressure homogenization of aqueous surfactant solutions containing the drug-loaded lipids in the melted or in the solid state with formula optimization study (Different lipid concentration, drug loaded, homogenization / stirring speed and compritol 888ATO: drug ratio). ACV - SLN incorporated in cream base. The pH was evaluated and rheological study. Drug release was evaluated and compared with simple cream- drug, ACV – SLN with compritol 888ATO and marketed cream. The potential of SLN as the carrier for dermal delivery was studied. Results: Particle size analysis of SLNs prove small, smooth, spherical shape particle ranged from 150 to 200 nm for unloaded and from 330 to 444 nm for ACV loaded particles. The EE% for optimal formula is 72% with suitable pH for skin application. Rheological behavior is shear thinning and thixotropic. Release study proved controlled drug release for SLNs especially in formula containing compritol88 ATO. Stability study emphasized an insignificant change in SLNs properties over 6 month. In-vivo study showed significantly higher accumulation of ACV in stratum corneum, dermal layer, and receptor compartment compared with blank skin. Conclusion: AVC-loaded SLNs might be beneficial in controlling drug release, stable and improving dermal delivery of antiviral agent(s).

Formulation and Optimization of Immediate Release Pellets of Antiplatelet Drugs Using Design of Experimentation

2017 ◽  
Vol 7 (04) ◽  
Author(s):  
Deshkar S. S. ◽  
Pore A. R.
Keyword(s):  
Platelet Aggregation ◽  
Drug Release ◽  
Peripheral Arterial Disease ◽  
Tissue Injury ◽  
Immediate Release ◽  
Arterial Disease ◽  
Fixed Dose ◽  
Disintegration Time ◽  
Peripheral Arterial ◽  
Pvp K30

Platelets play an important role in hemostasis during tissue injury, which blocks the defect and terminates blood loss. Platelet aggregation inhibitors are widely used in treatment of cardiovascular disorders and Peripheral arterial disease. Clopidogrel bisulphate and Cilostazol, are FDA approved BCS class II drugs, used in treatment of Platelet aggregation, peripheral arterial disease and intermittent claudication. The aim of the present study was to develop an immediate release pellets for combination of Clopidogrel bisulphate and Cilostazol using extrusion spheronization technique. The effects of spheronization speed(X1) and binder concentration (PVP K30) (X2), on size of pellets, disintegration time and drug release were studied using 32 full factorial design. The surface response and counter plot were drawn to facilitate an understanding of the contribution of the variables and their interaction. From the results, speed of spheronization of 1100 rpm and 5% concentration of PVP K30, were selected. In vitro drug release studies revealed more than 80% of clopidogrel bisulphate release and more than 75% of cilostazol release within 30 min of dissolution which complied with the pharmacopoeal limits. Film coated pellets did not show significant change in the drug release. DSC and FTIR studies revealed no interaction of drugs and excipient during pellet formulation. The pellet formulations of clopidogrel and cilostazol were found to be stable when stored at 40ºC±2ºC/ 75%RH±5%RH for 2 months. Conclusively, clopidogrel bisulphate and cilostazol pellet fixed dose combination could be successfully developed by design of experimentation and complied with pharmacopoeal limits.

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