scholarly journals A slow, efficient and safe nanoplatform of tailored ZnS QD-mycophenolic acid conjugates for in vitro drug delivery against dengue virus 2 genome replication

2020 ◽  
Vol 2 (12) ◽  
pp. 5777-5789
Author(s):  
Ranjeet Dungdung ◽  
Manikanta Bayal ◽  
Lathika Valliyott ◽  
Unnikrishnan Unniyampurath ◽  
Swapna S. Nair ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Dengue Virus ◽  
Mycophenolic Acid ◽  
Genome Replication ◽  
Effective Delivery

The graphical abstract represents the synthesis of size engineered ZnS QDs for conjugating anti-viral drug (MPA) and its safe and effective delivery against cytoplasmically replicating dengue virus 2.

scholarly journals High Fidelity of Yellow Fever Virus RNA Polymerase

2004 ◽  
Vol 78 (2) ◽  
pp. 1032-1038 ◽  
Author(s):  
Konstantin V. Pugachev ◽  
Farshad Guirakhoo ◽  
Simeon W. Ocran ◽  
Fred Mitchell ◽  
Megan Parsons ◽  
...  
Keyword(s):  
Dengue Virus ◽  
Rna Polymerase ◽  
Yellow Fever ◽  
Error Rate ◽  
Yellow Fever Virus ◽  
Protein A ◽  
Fever Virus ◽  
Genome Replication ◽  
Virus Rna

ABSTRACT Three consecutive plaque purifications of four chimeric yellow fever virus-dengue virus (ChimeriVax-DEN) vaccine candidates against dengue virus types 1 to 4 were performed. The genome of each candidate was sequenced by the consensus approach after plaque purification and additional passages in cell culture. Our data suggest that the nucleotide sequence error rate for SP6 RNA polymerase used in the in vitro transcription step to initiate virus replication was as high as 1.34 × 10−4 per copied nucleotide and that the error rate of the yellow fever virus RNA polymerase employed by the chimeras for genome replication in infected cells was as low as 1.9 × 10−7 to 2.3 × 10−7. Clustering of beneficial mutations that accumulated after multiple virus passages suggests that the N-terminal part of the prM protein, a specific site in the middle of the E protein, and the NS4B protein may be essential for nucleocapsid-envelope interaction during flavivirus assembly.

scholarly journals Liposomal Drug Delivery of a Major Component of Coconut Oil for the Treatment of Acne Vulgaris in vitro and in vivo

CORD ◽  
2016 ◽  
Vol 32 (1) ◽  
pp. 9
Author(s):  
Dissaya Pornpattananangku
Keyword(s):  
Drug Delivery ◽  
Antimicrobial Activity ◽  
Lauric Acid ◽  
Acne Vulgaris ◽  
Coconut Oil ◽  
Lipid Vesicle ◽  
Liposomal Drug ◽  
Effective Delivery

Abundantly found in coconut oil, lauric acid (LA), a 12-carbon atom chain free fatty acid, has shown its potent antimicrobial activity against the acne-causing bacteria, Propionibacterium acnes (P. acnes). To facilitate the administration of LA and improve its efficacy, nanoliposomes were used to encapsulate LA. In this study, the antimicrobial activity of LA was compared with other free fatty acids and benzoyl peroxide (BPO). Subsequently, LA was incorporated into nano-sized bilayer lipid vesicle (lauric acid liposome, LipoLA). It was demonstrated that the antimicrobial activity of LA in LipoLA was enhanced at low LA concentration. Interaction study also showed that the liposome aids in the fusion between LA and the bacterial membrane, leading to an effective delivery of LA molecules to the target site. More interestingly, in vivo study indicates that antimicrobial activity of LipoLA is well preserved and higher than BPO. Since LA is a natural compound from coconut oil and liposomes have been successfully and widely applied as a drug delivery vehicle in the clinic, the LipoLA developed in this work holds great potential of becoming a safe and effective therapeutic medication for acne vulgaris and other P. acnes associated infections.

Development of Solid Lipid Nanoparticles of Lamivudine for Brain Targeting

2009 ◽  
Vol 1 (1) ◽  
Author(s):  
Pravin Patil ◽  
Anil Sharma ◽  
Subhash Dadarwal ◽  
Vijay Sharma
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Solid Lipid Nanoparticles ◽  
Rotation Speed ◽  
Lipid Nanoparticles ◽  
Brain Targeting ◽  
Brain Penetration ◽  
Solid Lipid ◽  
Diffusion Technique

The objective of present investigation was to enhance brain penetration of Lamivudine, one of the most widely used drugs for the treatment of AIDS. This was achieved through incorporating the drug into solid lipid nanoparticles (SLN) prepared by using emulsion solvent diffusion technique. The formulations were characterized for surface morphology, size and size distribution, percent drug entrapment and drug release. The optimum rotation speed, resulting into better drug entrapment and percent yield, was in the range of 1000-1250 r/min. In vitro cumulative % drug release from optimized SLN formulation was found 40-50 % in PBS (pH-7.4) and SGF (pH-1.2) respectively for 10 h. After 24 h more than 65 % of the drug was released from all formulations in both mediums meeting the requirement for drug delivery for prolong period of time.

Functionalized Nano-graphene Oxide as Multi-modal Clinic for Effective Drug Delivery

2017 ◽  
Vol 10 (4) ◽  
pp. 3768-3771
Author(s):  
Soumitra Satapathi ◽  
Rutusmita Mishra ◽  
Manisha Chatterjee ◽  
Partha Roy ◽  
Somesh Mohapatra
Keyword(s):  
Drug Delivery ◽  
Graphene Oxide ◽  
Cancer Cell ◽  
High Surface ◽  
High Surface Area ◽  
Cancer Cell Line ◽  
Xrd Analysis ◽  
Graphene Derivatives ◽  
Nano Graphene

Nano-materials based drug delivery modalities to specific organs and tissues has become one of the critical endeavors in pharmaceutical research. Recently, two-dimensional graphene has elicited considerable research interest because of its potential application in drug delivery systems. Here we report, the drug delivery applications of PEGylated nano-graphene oxide (nGO-PEG), complexed with a multiphoton active and anti-cancerous diarylheptanoid drug curcumin. Specifically, graphene-derivatives were used as nanovectors for the delivery of the hydrophobic anticancer drug curcumin due to its high surface area and easy surface functionalization. nGO was synthesized by modified Hummer’s method and confirmed by XRD analysis. The formation of nGO, nGO-PEG and nGO-PEG-Curcumin complex were monitored through UV-vis, IR spectroscopy. MTT assay and AO/EB staining found that nGO-PEG-Curcumin complex afforded highly potent cancer cell killing in vitro with a human breast cancer cell line MCF7.

Development and Characterization Colchicine-Loaded PEGylated Gelatin Nanoparticles for Targeted Delivery to Tumor

2013 ◽  
Vol 6 (2) ◽  
pp. 2058-2063
Author(s):  
G D Chandrethiya ◽  
P K Shelat ◽  
M N Zaveri
Keyword(s):  
Drug Delivery ◽  
Targeted Delivery ◽  
High Performance ◽  
Entrapment Efficiency ◽  
Stability Study ◽  
Spherical Particles ◽  
Precipitation Method ◽  
Antitumoral Activity ◽  
Gelatin Nanoparticles

PEGylated gelatin nanoparticles loaded with colchicine were prepared by ethanol precipitation method. Poly-(ethylene glycol)-5000-monomethylether (MPEG 5000), a hydrophilic polymer, was used to pegylate gelatin.  Gluteraldehyde was used as cross-linking agent. To obtain a high quality product, major formulation parameters were optimized.  Spherical particles with mean particles of 193 nm were measured by a Malvern particle size analyzer. Entrapment efficiency was found to be 71.7 ± 1.4% and determined with reverse phase high performance liquid charomatography (RP-HPLC). The in vitro drug release study was performed by dialysis bag method for a period of 168 hours. Lyophilizaton study showed sucrose at lower concentrations proved the best cryoprotectant for this formulation.  Stability study revealed that lyophilized nanoparticles were equally effective (p < 0.05) after one year of storage at 2-8°C with ambient humidity. In vitro antitumoral activity was accessed using the MCF-7 cell line by MTT assay.  The IC50 value was found to be 0.034 μg/ml for the prepared formulation. The results indicate that PEGylated gelatin nanoparticles could be utilized as a potential drug delivery for targeted drug delivery of tumors.  

Formulation of Oral Mucoadhesive Tablets using Mucilage Isolated from Buchanania lanzan spreng Seeds

2014 ◽  
Vol 7 (2) ◽  
pp. 2494-2503
Author(s):  
Sudarshan Singh ◽  
Ayaz Ahmad ◽  
Sunil Bothara B
Keyword(s):  
Drug Delivery ◽  
Guar Gum ◽  
Physical Property ◽  
Flow Property ◽  
Relative Effect ◽  
Losartan Potassium ◽  
In Vitro Dissolution ◽  
Wet Granulation ◽  
Microbial Count

The present study was taken to formulate and evaluate mucilage obtained from Buchanania lanzan spreng seeds (BL) belonging to family anacardiacea for oral mucoadhesive drug delivery system containing losartan potassium. Physiochemical characteristics of mucilage, such as swelling index, microbial count, viscosity, hydration capacity, flow property, and pH were studied. The mucilage was evaluated for its mucoadhesive properties in compressed tablet, containing losartan potassium. Granules were prepared by wet granulation process using polyvinylpyrrolidone as binding agent. Mucilage was used in four different concentrations i.e., 21, 42 and 55% w/w. The tablet were prepared and evaluated for its physical property. Further, in vitro dissolution and swelling index was determined. The property of bioadhesive strength of isolated mucilage was compared with Guar gum and HPMC E5LV, which was used as standard mucoadhesive agent concentration. Bioadhesive strength of the tablet was measured on the modified physical balance. Result revealed that tablets had good physiochemical properties, and drug release was retarded as concentration of mucilage was increased. The force of adhesion was obtained 0.1238N, 0.2822N, 0.5175N, 0.8679N and 0.3983N respectively for F1, F2, F3, F4 and F5. Formulations were subjected for study the effect of agitation at different rpm. Formulation showed relative effect on release of drug from formulation. All the formulations were subjected to stability studies for three months, all formulations showed stability with respect to release pattern. In conclusions, these results indicate that the seed mucilage of BL can be a suitable excipient for oral mucoadhesive drug delivery systems.  

Hydrogels: A Versatile Drug Delivery Carrier Systems

1970 ◽  
Vol 5 (3) ◽  
pp. 1745-1756
Author(s):  
L H Baldaniya ◽  
Sarkhejiya N A
Keyword(s):  
Drug Delivery ◽  
Protein Delivery ◽  
Structural Integrity ◽  
Healing Process ◽  
Polymer Chains ◽  
Wound Healing Process ◽  
Aqueous Environment ◽  
Preparation Methods ◽  
Control Drug

Hydrogels are the material of choice for many applications in regenerative medicine due to their unique properties including biocompatibility, flexible methods of synthesis, range of constituents, and desirable physical characteristics. Hydrogel (also called Aquagel) is a network of polymer chains that are hydrophilic, sometimes found as a colloidal gel in which water is the dispersion medium. Hydrogels are highly absorbent (contain ~99.9% water), natural or synthetic polymers. Hydrogel also possess a degree of flexibility very similar to natural tissue, due to its significant water content. It can serve as scaffolds that provide structural integrity to tissue constructs, control drug and protein delivery to tissues and cultures. Also serve as adhesives or barriers between tissue and material surfaces. The positive effect of hydrogels on wounds and enhanced wound healing process has been proven. Hydrogels provide a warm, moist environment for wound that makes it heal faster in addition to its useful mucoadhesive properties. Moreover, hydrogels can be used as carriers for liposomes containing variety of drugs, such as antimicrobial drugs. Hydrogels are water swollen polymer matrices, with a tendency to imbibe water when placed in aqueous environment. This ability to swell, under biological conditions, makes it an ideal material for use in drug delivery and immobilization of proteins, peptides, and other biological compounds. Hydrogels have been extensively investigated for use as constructs to engineer tissues in vitro. This review describes the properties, classification, preparation methods, applications, various monomer used in formulation and development of hydrogel products.

Recent In Vitro and In Silico Advances in the Understanding of Intranasal Drug Delivery

2020 ◽  
Vol 26 ◽  
Author(s):  
John Chen ◽  
Andrew Martin ◽  
Warren H. Finlay
Keyword(s):  
Drug Delivery ◽  
In Silico ◽  
Local Drug Delivery ◽  
In Vivo Studies ◽  
Intranasal Drug Delivery ◽  
Nasal Sprays ◽  
In Silico Studies ◽  
Drug Delivery Devices

Background: Many drugs are delivered intranasally for local or systemic effect, typically in the form of droplets or aerosols. Because of the high cost of in vivo studies, drug developers and researchers often turn to in vitro or in silico testing when first evaluating the behavior and properties of intranasal drug delivery devices and formulations. Recent advances in manufacturing and computer technologies have allowed for increasingly realistic and sophisticated in vitro and in silico reconstructions of the human nasal airways. Objective: To perform a summary of advances in understanding of intranasal drug delivery based on recent in vitro and in silico studies. Conclusion: The turbinates are a common target for local drug delivery applications, and while nasal sprays are able to reach this region, there is currently no broad consensus across the in vitro and in silico literature concerning optimal parameters for device design, formulation properties and patient technique which would maximize turbinate deposition. Nebulizers are able to more easily target the turbinates, but come with the disadvantage of significant lung deposition. Targeting of the olfactory region of the nasal cavity has been explored for potential treatment of central nervous system conditions. Conventional intranasal devices, such as nasal sprays and nebulizers, deliver very little dose to the olfactory region. Recent progress in our understanding of intranasal delivery will be useful in the development of the next generation of intranasal drug delivery devices.

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