scholarly journals Chitosan and its Derivatives for Ocular Delivery Formulations: Recent Advances and Developments

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1519 ◽  
Author(s):  
Alexandra Zamboulis ◽  
Stavroula Nanaki ◽  
Georgia Michailidou ◽  
Ioanna Koumentakou ◽  
Maria Lazaridou ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Tight Junctions ◽  
Antibacterial Properties ◽  
Delivery Systems ◽  
Ocular Drug Delivery ◽  
Review Article ◽  
Present Review ◽  
Ocular Delivery ◽  
Ophthalmic Delivery ◽  
Permeability Enhancer

Chitosan (CS) is a hemi-synthetic cationic linear polysaccharide produced by the deacetylation of chitin. CS is non-toxic, highly biocompatible, and biodegradable, and it has a low immunogenicity. Additionally, CS has inherent antibacterial properties and a mucoadhesive character and can disrupt epithelial tight junctions, thus acting as a permeability enhancer. As such, CS and its derivatives are well-suited for the challenging field of ocular drug delivery. In the present review article, we will discuss the properties of CS that contribute to its successful application in ocular delivery before reviewing the latest advances in the use of CS for the development of novel ophthalmic delivery systems. Colloidal nanocarriers (nanoparticles, micelles, liposomes) will be presented, followed by CS gels and lenses and ocular inserts. Finally, instances of CS coatings, aiming at conferring mucoadhesiveness to other matrixes, will be presented.

scholarly journals Thiolation of Biopolymers for Developing Drug Delivery Systems with Enhanced Mechanical and Mucoadhesive Properties: A Review

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1803
Author(s):  
Vivek Puri ◽  
Ameya Sharma ◽  
Pradeep Kumar ◽  
Inderbir Singh
Keyword(s):  
Mechanical Properties ◽  
Drug Delivery ◽  
Efficient Method ◽  
Drug Delivery Systems ◽  
Delivery Systems ◽  
Review Article ◽  
Present Review ◽  
Tabular Form ◽  
Thiolated Polymers ◽  
Drug Delivery Applications

Biopolymers are extensively used for developing drug delivery systems as they are easily available, economical, readily modified, nontoxic, biodegradable and biocompatible. Thiolation is a well reported approach for enhancing mucoadhesive and mechanical properties of polymers. In the present review article, for the modification of biopolymers different thiolation methods and evaluation/characterization techniques have been discussed in detail. Reported literature on thiolated biopolymers with enhanced mechanical and mucoadhesive properties has been presented conspicuously in text as well as in tabular form. Patents filed by researchers on thiolated polymers have also been presented. In conclusion, thiolation is an easily reproducible and efficient method for customization of mucoadhesive and mechanical properties of biopolymers for drug delivery applications.

Nanoscale Drug Delivery Systems for Glaucoma: Experimental and In Silico Advances

2020 ◽  
Vol 20 ◽  
Author(s):  
Smriti Sharma ◽  
Vinayak Bhatia
Keyword(s):  
Drug Delivery ◽  
In Silico ◽  
Drug Delivery Systems ◽  
Delivery Systems ◽  
Ocular Drug Delivery ◽  
The Body ◽  
Single Wall Carbon Nanotubes ◽  
Blood Retinal Barrier ◽  
Novel Drugs ◽  
Blood Aqueous Barrier

: In this review nanoscale based drug delivery systems particularly in relevance to the antiglaucoma drugs have been discussed. In addition to that, the latest computational/in silico advances in this field are examined in brief. Using nanoscale materials for drug delivery, is an ideal option to target tumours and drug can be released at areas of the body where traditional drugs may fail to act. Nanoparticles, polymeric nanomaterials, single-wall carbon nanotubes (SWCNTs), quantum dots (QDs), liposomes and graphene are the most important nanomaterials used for drug delivery. Ocular drug delivery is one of the most common and difficult tasks faced by pharmaceutical scientists because of many challenges like circumventing the blood–retinal barrier, corneal epithelium and the blood–aqueous barrier. Authors found compelling empirical evidence of scientists relying on in-silico approaches to develop novel drugs and drug delivery systems for treating glaucoma. This review in nanoscale drug delivery systems will help us in understand the existing queries and evidence gaps and will pave way for effective design of novel ocular drug delivery systems

Advanced Hydrogels Based Drug Delivery Systems for Ophthalmic Delivery

2020 ◽  
Vol 13 (4) ◽  
pp. 291-300 ◽  
Author(s):  
Srividya Gorantla ◽  
Tejashree Waghule ◽  
Vamshi Krishna Rapalli ◽  
Prem Prakash Singh ◽  
Sunil Kumar Dubey ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Drug Delivery Systems ◽  
Delivery Systems ◽  
Age Related Macular Degeneration ◽  
Stimuli Responsive ◽  
Duration Of Action ◽  
Age Related ◽  
Aqueous Gels ◽  
Ophthalmic Delivery ◽  
3D Printed

Hydrogels are aqueous gels composed of cross-linked networks of hydrophilic polymers. Stimuli-responsive based hydrogels have gained focus over the past 20 years for treating ophthalmic diseases. Different stimuli-responsive mechanisms are involved in forming polymer hydrogel networks, including change in temperature, pH, ions, and others including light, thrombin, pressure, antigen, and glucose-responsive. Incorporation of nanocarriers with these smart stimuli-responsive drug delivery systems that can extend the duration of action by increasing ocular bioavailability and reducing the dosing frequency. This review will focus on the hydrogel drug delivery systems highlighting the gelling mechanisms and emerging stimuli-responsive hydrogels from preformed gels, nanogels, and the role of advanced 3D printed hydrogels in vision-threatening diseases like age-related macular degeneration and retinitis pigmentosa. It also provides insight into the limitations of hydrogels along with the safety and biocompatibility of the hydrogel drug delivery systems.

Nanomaterials as drug delivery systems with antibacterial properties: current trends and future priorities

2021 ◽  
Author(s):  
Khatereh Khorsandi ◽  
Reza Hosseinzadeh ◽  
Homa Sadat Esfahani ◽  
Saeedeh Keyvani-Ghamsari ◽  
Saeed Ur Rahman
Keyword(s):  
Drug Delivery ◽  
Drug Delivery Systems ◽  
Antibacterial Properties ◽  
Delivery Systems ◽  
Current Trends

scholarly journals Topical Drug Delivery to the Posterior Segment of the Eye

Pharmaceutics ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 134
Author(s):  
Marina Löscher ◽  
Chiara Seiz ◽  
José Hurst ◽  
Sven Schnichels
Keyword(s):  
Drug Delivery ◽  
Animal Models ◽  
Treatment Option ◽  
Topical Treatment ◽  
Delivery Systems ◽  
Ocular Drug Delivery ◽  
Posterior Segment ◽  
Retinal Diseases ◽  
Topical Drug Delivery ◽  
Ocular Pharmacokinetics

Topical drug delivery to the posterior segment of the eye is a very complex challenge. However, topical delivery is highly desired, to achieve an easy-to-use treatment option for retinal diseases. In this review, we focus on the drug characteristics that are relevant to succeed in this challenge. An overview on the ocular barriers that need to be overcome and some relevant animal models to study ocular pharmacokinetics are given. Furthermore, a summary of substances that were able to reach the posterior segment after eye drop application is provided, as well as an outline of investigated delivery systems to improve ocular drug delivery. Some promising results of substances delivered to the retina suggest that topical treatment of retinal diseases might be possible in the future, which warrants further research.

Unique Ocular Drug Delivery Systems

2013 ◽  
pp. 73-73
Author(s):  
Xiadong Zheng ◽  
Ashim Mitra ◽  
James Hill ◽  
Marg Marquart
Keyword(s):  
Drug Delivery ◽  
Drug Delivery Systems ◽  
Delivery Systems ◽  
Ocular Drug Delivery

scholarly journals GASTRORETENTIVE DRUG DELIVERY SYSTEMS: FROM CONCEPTION TO COMMERCIAL SUCCESS

2017 ◽  
Vol 4 (2) ◽  
pp. 10 ◽  
Author(s):  
Harshil P. Shah ◽  
Shailesh T. Prajapati ◽  
C. N. Patel
Keyword(s):  
Drug Delivery ◽  
Drug Delivery Systems ◽  
Oral Route ◽  
Delivery Systems ◽  
Present Review ◽  
Gastric Residence Time ◽  
In Vivo Characterization ◽  
Absorption Window

Despite the extensive advancements in the field of drug delivery, the oral route remains the favorable route for administration of therapeutic actives. A success of oral controlled drug delivery systems is associated with reduced dosing frequency, decreased fluctuation in plasma drug concentration profile along with improved patient compliance. However, they are also associated with challenges like shorter gastric residence time, unpredictable gastric emptying and poor bioavailability for some molecules. This has initiated tremendous advancements in the field of gastro-retention to achieve controlled release of drugs along with improved bioavailability of drugs with narrow absorption window as well as localized action in the stomach and upper part of GIT. In present review, efforts have been envisaged to summarize our current understanding in the field of gastro-retention and their in vitro as well as in vivo characterization. Present review also highlights commercially utilized gastro-retentive technologies and some recently granted US patents in the field of GRDDS.

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