1
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Qin D, Han Y, Wang L, Yin H. Recent advances in medicinal compounds related to corneal crosslinking. Front Pharmacol 2023; 14:1232591. [PMID: 37841929 PMCID: PMC10570464 DOI: 10.3389/fphar.2023.1232591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 09/21/2023] [Indexed: 10/17/2023] Open
Abstract
Corneal crosslinking (CXL) is the recognized technique to strengthen corneal collagen fibers through photodynamic reaction, aiming to halt progressive and irregular changes in corneal shape. CXL has greatly changed the treatment for keratoconus (KCN) since it was introduced in the late 1990's. Numerous improvements of CXL have been made during its developing course of more than 20 years. CXL involves quite a lot of materials, including crosslinking agents, enhancers, and supplements. A general summary of existing common crosslinking agents, enhancers, and supplements helps give a more comprehensive picture of CXL. Either innovative use of existing materials or research and development of new materials will further improve the safety, effectiveness, stability, and general applicability of CXL, and finally benefit the patients.
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Affiliation(s)
- Danyi Qin
- Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, Sichuan, China
- Fujian Provincial Key Laboratory of Ophthalmology and Visual Science, Eye Institute and Affiliated Xiamen Eye Center, School of Medicine, Xiamen University, Xiamen, Fujian, China
| | - Yi Han
- Fujian Provincial Key Laboratory of Ophthalmology and Visual Science, Eye Institute and Affiliated Xiamen Eye Center, School of Medicine, Xiamen University, Xiamen, Fujian, China
| | - Lixiang Wang
- Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Hongbo Yin
- Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, Sichuan, China
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2
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Development and Characterization of Azithromycin-Loaded Microemulsions: A Promising Tool for the Treatment of Bacterial Skin Infections. Antibiotics (Basel) 2022; 11:antibiotics11081040. [PMID: 36009909 PMCID: PMC9404999 DOI: 10.3390/antibiotics11081040] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 07/27/2022] [Accepted: 07/30/2022] [Indexed: 02/05/2023] Open
Abstract
In recent years, the treatment of bacterial skin infections has been considered a major healthcare issue due to the growing emergence of antibiotic-resistant strains of Staphylococcus aureus. The incorporation of antibiotics in appropriate nanosystems could represent a promising strategy, able to overcome several drawbacks of the topical treatment of infections, including poor drug retention within the skin. The present work aims to develop microemulsions containing azithromycin (AZT), a broad-spectrum macrolide antibiotic. Firstly, AZT solubility in various oils, surfactants and co-surfactants was assessed to select the main components. Subsequently, microemulsions composed of vitamin E acetate, Labrasol® and Transcutol® P were prepared and characterized for their pH, viscosity, droplet size, zeta potential and ability to release the drug and to promote its retention inside porcine skin. Antimicrobial activity against S. aureus methicillin-resistant strains (MRSA) and the biocompatibility of microemulsions were evaluated. Microemulsions showed an acceptable pH and were characterized by different droplet sizes and viscosities depending on their composition. Interestingly, they provided a prolonged release of AZT and promoted its accumulation inside the skin. Finally, microemulsions retained AZT efficacy on MRSA and were not cytotoxic. Hence, the developed AZT-loaded microemulsions could be considered as useful nanocarriers for the treatment of antibiotic-resistant infections of the skin.
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3
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Polyaphron Formulations Stabilised with Different Water-Soluble Polymers for Ocular Drug Delivery. Pharmaceutics 2022; 14:pharmaceutics14050926. [PMID: 35631511 PMCID: PMC9146855 DOI: 10.3390/pharmaceutics14050926] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 04/13/2022] [Accepted: 04/21/2022] [Indexed: 01/17/2023] Open
Abstract
As drug delivery to the eye has evolved over the last decades, researchers have explored more effective treatments for ocular diseases. Despite this, delivering drugs to the cornea remains one of the most problematic issues in ophthalmology due to the poor permeability of the cornea and tear clearance mechanisms. In this study, four different types of polyaphron formulations are prepared with 10% poloxamer 188 (P188), 10% poly(2-ethyl-2-oxazoline), 1% polyquaternium 10, and 3% sodium carboxymethylcellulose solutions mixed with 1% Brij® L4 in a caprylic/capric triglycerides solution. Their physicochemical characteristics, rheological properties, and stability are assessed. Additionally, a polyaphron with 3% polyquaternium 10 was prepared for the assessment of ex vivo corneal retention along with four other polyaphrons. The best retention on the ex vivo cornea was displayed by the 3% polyquaternium 10-based formulation. The 10% poloxamer 188 along with 1% polyquaternium 10-based polyaphrons appeared to be the most stable among the four prepared formulations. A toxicological evaluation of these formulations was performed using a slug mucosal irritation test and bovine corneal opacity and permeability assay, with all four polyaphrons proving good biocompatibility with ocular tissues. The developed drug delivery systems demonstrated an excellent potential for ocular drug delivery.
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4
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Sahiner N. One step synthesis of an amino acid derived particles, poly(
L‐Arginine
) and its biomedical application. POLYM ADVAN TECHNOL 2021. [DOI: 10.1002/pat.5559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Nurettin Sahiner
- Faculty of Science and Arts, Department of Chemistry, Terzioglu Campus Canakkale Onsekiz Mart University Canakkale Turkey
- Nanoscience and Technology Research and Application Center (NANORAC), Terzioglu Campus Canakkale Onsekiz Mart University Canakkale Turkey
- Department of Chemical and Biomolecular Engineering University of South Florida Tampa Florida USA
- Department of Ophthalmology, Morsani College of Medicine University of South Florida Tampa Florida USA
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5
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Aytekin E, Pehlivan SB. Corneal cross-linking approaches on keratoconus treatment. J Drug Deliv Sci Technol 2021. [DOI: 10.1016/j.jddst.2021.102524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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6
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Fabrication of Alginate-Based O/W Nanoemulsions for Transdermal Drug Delivery of Lidocaine: Influence of the Oil Phase and Surfactant. Molecules 2021; 26:molecules26092556. [PMID: 33925764 PMCID: PMC8125457 DOI: 10.3390/molecules26092556] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 04/18/2021] [Accepted: 04/19/2021] [Indexed: 11/17/2022] Open
Abstract
Transdermal drug delivery of lidocaine is a good choice for local anesthetic delivery. Microemulsions have shown great effectiveness for the transdermal transport of lidocaine. Oil-in-water nanoemulsions are particularly suitable for encapsulation of lipophilic molecules because of their ability to form stable and transparent delivery systems with good skin permeation. However, fabrication of nanoemulsions containing lidocaine to provide an extended local anesthetic effect is challenging. Hence, the aim of this study was to address this issue by employing alginate-based o/w nanocarriers using nanoemulsion template that is prepared by combined approaches of ultrasound and phase inversion temperature (PIT). In this study, the influence of system composition such as oil type, oil and surfactant concentration on the particle size, in vitro release and skin permeation of lidocaine nanoemulsions was investigated. Structural characterization of lidocaine nanoemulsions as a function of water dilution was done using DSC. Nanoemulsions with small droplet diameters (d < 150 nm) were obtained as demonstrated by dynamic light scattering (DLS) and cryo-TEM. These nanoemulsions were also able to release 90% of their content within 24-h through PDMS and pig skin and able to the drug release over a 48-h. This extended-release profile is highly favorable in transdermal drug delivery and shows the great potential of this nanoemulsion as delivery system.
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7
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Mahran A, Ismail S, Allam AA. Development of Triamcinolone Acetonide-Loaded Microemulsion as a Prospective Ophthalmic Delivery System for Treatment of Uveitis: In Vitro and In Vivo Evaluation. Pharmaceutics 2021; 13:444. [PMID: 33805986 PMCID: PMC8064451 DOI: 10.3390/pharmaceutics13040444] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 03/19/2021] [Accepted: 03/22/2021] [Indexed: 01/15/2023] Open
Abstract
Treatment of uveitis (i.e., inflammation of the uvea) is challenging due to lack of convenient ophthalmic dosage forms. This work is aimed to determine the efficiency of triamcinolone acetonide (TA)-loaded microemulsion as an ophthalmic delivery system for the treatment of uveitis. Water titration method was used to construct different pseudo-ternary phase diagrams. Twelve microemulsion formulations were prepared using oleic acid, Cremophor EL, and propylene glycol. Among all tested formulations, Formulation F3, composed of oil: surfactant-co-surfactant (1:1): water (15:35:50% w/w, respectively), was found to be stable and showed acceptable pH, viscosity, conductivity, droplet size (211 ± 1.4 nm), and zeta potential (-25 ± 1.7 mV) and almost complete in vitro drug release within 24 h. The in vivo performance of the optimized formulation was evaluated in experimentally uveitis-induced rabbit model and compared with a commercial TA suspension (i.e., Kenacort®-A) either topically or by subconjunctival injection. Ocular inflammation was evaluated by clinical examination, white blood cell count, protein content measurement, and histopathological examination. The developed TA-loaded microemulsion showed superior therapeutic efficiency in the treatment of uveitis with high patient compliance compared to commercial suspension. Hence, it could be considered as a potential ocular treatment option in controlling of uveitis.
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Affiliation(s)
- Alaa Mahran
- Department of Pharmaceutics, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt; (A.M.); (S.I.)
| | - Sayed Ismail
- Department of Pharmaceutics, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt; (A.M.); (S.I.)
| | - Ayat A. Allam
- Department of Pharmaceutics, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt; (A.M.); (S.I.)
- Department of Pharmaceutics, Faculty of Pharmacy, Sphinx University, New Assiut City, Assiut 71515, Egypt
- Assiut International Center of Nanomedicine, Al-Rajhy Liver Hospital, Assiut University, Assiut 71515, Egypt
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8
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Conde Penedo A, Díaz Tomé V, Fernández Ferreiro A, González Barcia M, Otero Espinar FJ. Enhancement in corneal permeability of riboflavin using cyclodextrin derivates complexes as a previous step to transepithelial cross-linking. Eur J Pharm Biopharm 2021; 162:12-22. [PMID: 33667681 DOI: 10.1016/j.ejpb.2021.02.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 02/15/2021] [Accepted: 02/23/2021] [Indexed: 01/14/2023]
Abstract
Corneal cross-linking has been described as an effective treatment to slow the progression of keratoconus. The standard protocol entails corneal epithelial removal to allow the diffusion of riboflavin into the stroma. Although, de-epithelization can generate risks or complications that transepithelial cross-linking tries to solve or avoid. Different formulations were developed after verifying that hydroxypropyl-β-cyclodextrin (HPβCD) and sulfobuthylether-β-cyclodextrin (SBEβCD) in a 20% concentration, increased the solubility of practically insoluble in water drugs such as riboflavin from 0.12 mg/mL to 0.35 mg/mL and 0.29 mg/mL respectively. These values were higher when chitosan and arginine were added to the formulation, showing solubility of 0.78 mg/mL when HPβCD concentration was not modified. Ex vivo corneal permeability was measured after having kept in contact bovine corneas with intact epithelium for 5 h with the 0.1 mg/mL riboflavin solution, the formulations developed and a reproduced nanoemulsion from another work. Riboflavin's permeability was increased when cyclodextrins, chitosan, and arginine were part of the formulations, compared to the control drug solution. The best permeability coefficient was reached when riboflavin was combined with 40% (w/v) HPβCD, 0.5% (w/w) arginine, and 0.5% (w/w) chitosan. After having carried out toxicity studies as bovine corneal opacity and permeability (BCOP) and Heńs Egg Test - Chorioallantoic Membrane Test (HET-CAM) it was verified that both, the active ingredients and the excipients of the different formulations were not harmful without generating irritation, loss of transparency or corneal permeability alterations. The results show the great potential of the ocular developed solution for their use in transepithelial cross-linking for keratoconus treatment.
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Affiliation(s)
- Andrea Conde Penedo
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela, Santiago de Compostela, Spain; Paraquasil Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela, Santiago de Compostela, Spain
| | - Victoria Díaz Tomé
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela, Santiago de Compostela, Spain; Clinical Pharmacology Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela, Santiago de Compostela, Spain
| | - Anxo Fernández Ferreiro
- Pharmacy Department, University Clinical Hospital Santiago de Compostela, Santiago de Compostela, Spain; Clinical Pharmacology Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela, Santiago de Compostela, Spain.
| | - Miguel González Barcia
- Pharmacy Department, University Clinical Hospital Santiago de Compostela, Santiago de Compostela, Spain; Clinical Pharmacology Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela, Santiago de Compostela, Spain.
| | - Francisco J Otero Espinar
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela, Santiago de Compostela, Spain; Paraquasil Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela, Santiago de Compostela, Spain.
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9
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Abramov E, Garti N. Development of polymeric films embedded with liquid nanodomains. J Colloid Interface Sci 2021; 591:363-372. [PMID: 33621785 DOI: 10.1016/j.jcis.2021.02.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 02/04/2021] [Accepted: 02/07/2021] [Indexed: 10/22/2022]
Abstract
Modified microemulsions (MEs), termed by us nanodomains (NDs), seem to be suitable vehicles for dermal drug delivery due to their high surface area and the interface enriched with membrane recognizing agents, penetration enhancers, and other components. However, liquid nanodomains do not provide a controlled release of the bioactive through the skin. Therefore, the main goal of our present study is to develop a film polymeric platform embedded with liquid nanovehicles for the controlled release of drugs. This study provides a fundamental understanding of the main challenges of the preparation of special films capable of embedding nanodomains without destroying them. We describe film formation from "nanodomains destructive polymers" causing coalescence of the nanodroplets followed by structural failure compared to the formation from "constructive polymer" leading to the homogeneous, transparent films with a high loading capacity of nanodomains (up to 90 wt%). Using various fundamental structural techniques, we found that the film-forming process and its redissolution suggest the reconstitution of nanodomains with original structure and similar droplet size diameter ca. 12 nm. Additionally, thermal behavior studies demonstrated that the film does not have "free" or "bulk" water compared to well-defined free water peaks in liquid nanodomains systems. The embedded film with drug-loaded nanodomains offers a significant advantage as a drug delivery platform for controlled release long-term therapy.
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Affiliation(s)
- Eva Abramov
- Casali Institute of Applied Chemistry, Institute of Chemistry, Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem 91904, Israel.
| | - Nissim Garti
- Casali Institute of Applied Chemistry, Institute of Chemistry, Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem 91904, Israel.
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10
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Abramov E, Garti N. Incorporation of curcumin in liquid nanodomains embedded into polymeric films for dermal application. Colloids Surf B Biointerfaces 2020; 198:111468. [PMID: 33246778 DOI: 10.1016/j.colsurfb.2020.111468] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 11/05/2020] [Accepted: 11/07/2020] [Indexed: 11/18/2022]
Abstract
Liquid nanovehicles are gaining interest in drug delivery because of the high solubilization capacity of bioactives at their interface and enhanced permeation of compounds across physiological membranes. However, the dermal application of liquid nanovehicles is still limited. The goal of this research is to develop a dermal delivery system based on embedding of liquid nanovehicles into polymeric films, which will allow controlled release of the nanodroplets with the solubilized drug. In this study, we describe the incorporation of empty and curcumin-loaded nanodomains into polymeric film. The novel technology results in formation of homogeneous, transparent and elastic films with high (up to 85 wt%) loading capacity of nanodomains. The fundamental structural characterizations show that nanodomain structures embedded in the dry film are spontaneously reformed during the dermal application with similar droplets size of 10 nm. Ex-vivo release studies were performed on Franz diffusion cells and demonstrated a significant permeation of curcumin through the pig skin. This novel film technology can serve as a "solid platform reservoir" for liquid nanovehicles which enables controlled release of nanodroplets with solubilized bioactive.
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Affiliation(s)
- Eva Abramov
- Casali Institute of Applied Chemistry, Institute of Chemistry, Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem 91904, Israel.
| | - Nissim Garti
- Casali Institute of Applied Chemistry, Institute of Chemistry, Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem 91904, Israel.
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11
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Jalali-Jivan M, Garavand F, Jafari SM. Microemulsions as nano-reactors for the solubilization, separation, purification and encapsulation of bioactive compounds. Adv Colloid Interface Sci 2020; 283:102227. [PMID: 32781299 DOI: 10.1016/j.cis.2020.102227] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Revised: 07/28/2020] [Accepted: 07/28/2020] [Indexed: 02/06/2023]
Abstract
Bioactive components possess various functionalities and are most interested for different food, nutraceutical and pharmaceutical formulations. The current review will discuss the preparation methods and fabrication techniques to design microemulsions (MEs) for the solubilization, separation, encapsulation and purification of various agro-food bioactive compounds. ME systems have shown suitable potential in enhancing oil recovery, protein extraction, and isolation of bioactive compounds. Moreover, the capability of ME based systems as drug and nutraceutical delivery cargos, and synthesis of various organic and inorganic nanoparticles, especially using biopolymers, will be investigated. ME liquid membranes are also developed as nano-extractor/nano-reactor vehicles, capable of simultaneous extraction, encapsulation or even synthesis of hydrophilic and lipophilic bioactive compounds for food, nutraceutical and drug applications.
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Affiliation(s)
- Mehdi Jalali-Jivan
- Food Colloids and Rheology Lab, Department of Food Science and Technology, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran
| | - Farhad Garavand
- Department of Food Chemistry and Technology, Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork, Ireland
| | - Seid Mahdi Jafari
- Department of Food Materials and Process Design Engineering, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran.
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12
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13
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Acosta E. Engineering cosmetics using the Net-Average-Curvature (NAC) model. Curr Opin Colloid Interface Sci 2020. [DOI: 10.1016/j.cocis.2020.05.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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14
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Sahiner N. Amino acid‐derived Poly(
L
‐Lysine
) (p
(LL
)) microgel as a versatile biomaterial: Hydrolytically degradable, drug carrying, chemically modifiable and antimicrobial material. POLYM ADVAN TECHNOL 2020. [DOI: 10.1002/pat.4936] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Nurettin Sahiner
- Department of Chemistry & Nanoscience and Technology Research and Application CenterCanakkale Onsekiz Mart University Canakkale Turkey
- Department of OphthalmologyMorsani College of Medicine Tampa FL USA
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Üstündağ Okur N, Çağlar EŞ, Siafaka PI. Novel Ocular Drug Delivery Systems: An Update on Microemulsions. J Ocul Pharmacol Ther 2020; 36:342-354. [PMID: 32255728 DOI: 10.1089/jop.2019.0135] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Sufficient ophthalmic drug delivery is still challenging for pharmaceutical technologists, despite various scientific efforts. Several ocular drug carriers have been designed to enhance bioavailability by prolonging the drug retention time. One of the current encouraging approaches is the utilization of colloidal carriers with the characteristic submicron-nanometer size. Microemulsions (MEs) are such colloid systems that present sizes between 5 and 200 nm with significant thermodynamic stability and low surface tension. In addition, MEs as topical ocular carriers can lead to great ocular drug adsorption due to their enhanced retention time. Furthermore, considering that MEs are stable for long time and various temperatures, their ocular application is of great interest. The aim of this study is to cover basic physicochemical principals of ocular MEs such as their possible size, stability, and therapeutic efficacy against various eye disorders. Thus, a comprehensive review for ocular drug delivery systems in the form of MEs that show promising characteristics as their stability and therapeutic efficiency is performed.
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Affiliation(s)
- Neslihan Üstündağ Okur
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Health Sciences, Istanbul, Turkey
| | - Emre Şefik Çağlar
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Health Sciences, Istanbul, Turkey.,Department of Pharmaceutical Technology, Faculty of Pharmacy, Istanbul University, Istanbul, Turkey
| | - Panoraia I Siafaka
- School of Chemistry, Faculty of Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
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Nayak K, Misra M. PEGylated microemulsion for dexamethasone delivery to posterior segment of eye. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2020; 31:1071-1090. [PMID: 32149562 DOI: 10.1080/09205063.2020.1740964] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Dexamethasone (Dex) is one of the most commonly used anti-vascular endothelial growth factor (anti-VEGF) drugs being used in ocular diseases whether it is associated with anterior segment or posterior segment. For diseases of posterior segment of eye, Dex is delivered as intravitreal implant but the route used for the same is very invasive and poses several hazards on long term use. Thus, topical formulation with ability to outreach retina from ocular surface was intended. Thus, polyethylene glycolylated (PEGylated) microemulsion (ME) was attempted as it can cross the membranous barrier of eye (cornea, conjunctiva, and sclera) and remain afloat in fluidic barrier (aqueous humor, choroid, etc.) as well. Present investigation involved development of Dex-loaded PEGylated ME which was stable, non-toxic to ocular surface, capable to cross cornea and enhanced residence as well as availability of loaded drug in retina. The developed PEGylated ME had physicochemical properties like size (15.98 ± 3.05 nm), polydispersity index (0.25 ± 0.04), zeta potential (-0.04 ± 0.47 mV), percentage transmittance (99.84 ± 1.17%), and drug content (99.32 ± 3.21%). It showed sustained Dex release in in vitro conditions. It also displayed efficiency in enhancing retention of drugs in retina in in vivo pharmacokinetic study on Sprague-Dawley rats. PEGylated ME can retain the drug in retina of rats longer than simple eye drop solution via topical ocular route.
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Affiliation(s)
- Kritika Nayak
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research, Gandhinagar, Gujarat, India
| | - Manju Misra
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research, Gandhinagar, Gujarat, India.,Scientist B, B V Patel PERD Centre, Ahmedabad, Gujarat, India
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17
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Zhang X, Song M, Chai J, Cui X, Wang J. Preparation, characterization and application of a surfactant-free microemulsion containing 1-octen-3-ol, ethanol, and water. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.112278] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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18
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19
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Wen Y, Ban J, Mo Z, Zhang Y, An P, Liu L, Xie Q, Du Y, Xie B, Zhan X, Tan L, Chen Y, Lu Z. A potential nanoparticle-loaded in situ gel for enhanced and sustained ophthalmic delivery of dexamethasone. NANOTECHNOLOGY 2018; 29:425101. [PMID: 30074486 DOI: 10.1088/1361-6528/aad7da] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Increasing the permeability of drugs across the cornea is key to improving drug absorption by the eye. This study presents a newly developed in situ gel loaded with nanoparticles, which could achieve controlled drug release and high ocular drug bioavailability by avoiding rapid precorneal clearance. The physicochemical parameters of the formulation were investigated and showed uniform size, physical stability, and favorable rheological and gelling properties. Ex vivo permeation studies revealed significantly higher drug release from the in situ gel loaded with nanoparticles compared to the conventional poloxamer in situ gel and the drug solution. When compared with a marketed formulation, the in situ gel loaded with nanoparticles provided slower controlled release and higher ocular bioavailability of dexamethasone. In conclusion, the developed nanoparticle-loaded in situ gel can successfully increase drug ocular bioavailability by enhancing contact time with the ocular surface and permeation through the cornea.
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Affiliation(s)
- Yifeng Wen
- Guangdong Provincial Key Laboratory of Advanced Drug Delivery Systems, Guangdong Pharmaceutical University, Guangzhou, People's Republic of China. Guangdong Provincial Engineering Center of Topical Precise Drug Delivery Systems, Guangdong Pharmaceutical University, Guangzhou, People's Republic of China. R&D Team for Formulation Innovation, Guangdong Pharmaceutical University, Guangzhou, People's Republic of China
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20
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Lidich N, Garti-Levy S, Aserin A, Garti N. Potentiality of microemulsion systems in treatment of ophthalmic disorders: Keratoconus and dry eye syndrome - In vivo study. Colloids Surf B Biointerfaces 2018; 173:226-232. [PMID: 30300828 DOI: 10.1016/j.colsurfb.2018.09.063] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 09/04/2018] [Accepted: 09/24/2018] [Indexed: 12/28/2022]
Abstract
Microemulsions are widely studied as potential ocular drug delivery vehicles. In the present study we show the versatility of possible use microemulsions as ocular delivery vehicle. The ME is loaded with a hydrophilic drug, riboflavin phosphate (RFP) and a lipophilic, docosahexaenoic acid in triglyceride form (TG-DHA), each separately. These drugs treat keratoconus and dry eye syndrome, respectively. The advantage of using ME loaded with RFP is in overcoming eye epithelium debridement during collagen cross-linking therapy for treatment of keratoconus. ME loaded with lipophilic TG-DHA provides convenient dosage in liquid aqueous form of administration of highly lipophilic TG-DHA, which is known as a protective molecule in dry eye syndrome. The capability of RFP-loaded MEs was demonstrated in terms of improvement of biomechanical strength of the rabbit cornea, as a result of successful penetration of RFP through the intact epithelium. TG-DHA-loaded microemulsion applied topically onto an eye with induced dry eye syndrome showed the significant relief of the dry eye condition.
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Affiliation(s)
- Nina Lidich
- The Casali Center for Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem 9190401, Israel
| | - Sharon Garti-Levy
- Lyotropic Delivery Systems, High Tech Village, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem 9190401, Israel
| | - Abraham Aserin
- The Casali Center for Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem 9190401, Israel
| | - Nissim Garti
- The Casali Center for Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem 9190401, Israel.
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21
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Wang X, Zhang Y, Gui S, Huang J, Cao J, Li Z, Li Q, Chu X. Characterization of Lipid-Based Lyotropic Liquid Crystal and Effects of Guest Molecules on Its Microstructure: a Systematic Review. AAPS PharmSciTech 2018; 19:2023-2040. [PMID: 29869308 DOI: 10.1208/s12249-018-1069-1] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 05/01/2018] [Indexed: 12/16/2022] Open
Abstract
Liquid crystals (LCs) are conventionally divided into thermotropic or lyotropic, based on the organization and sequence of the controlled molecular system. Lipid-based lyotropic liquid crystal (LLC), such as lamellar (Lα), bicontinuous cubic (QII), or hexagonal (HII) phases, have attracted wide interest in the last few decades due to their practical potential in diverse applications and notable structural complexity. Various guest molecules, such as biopharmaceuticals, chemicals, and additives, can be solubilized in either aqueous or oily phase. And the LLC microstructure can be altered to affect the rate of drug release eventually. To utilize these microstructural variations to adjust the drug release in drug delivery system (DDS), it is crucial to understand the structure variations of the LLC caused by different types of guest molecules. Therefore, in this article, we review the effect of guest molecules on lipid-based LLC microstructures. In particular, we focus on the different characterization methods to evaluate this change caused by guest substances, such as polarized light microscopy (PLM), small-angle X-ray scattering (SAXS), Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), self-diffusion nuclear magnetic resonance (SD-NMR), and so on.
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22
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Lalu L, Tambe V, Pradhan D, Nayak K, Bagchi S, Maheshwari R, Kalia K, Tekade RK. Novel nanosystems for the treatment of ocular inflammation: Current paradigms and future research directions. J Control Release 2017; 268:19-39. [PMID: 28756272 DOI: 10.1016/j.jconrel.2017.07.035] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 07/24/2017] [Accepted: 07/25/2017] [Indexed: 12/23/2022]
Abstract
Ocular discomforts involve anterior/posterior-segment diseases, symptomatic distress and associated inflammations and severe retinal disorders. Conventionally, the formulations such as eye drops, eye solutions, eye ointments and lotions, etc. were used as modalities to attain relief from such ocular discomforts. However, eye allows limited access to these traditional formulations due to its unique anatomical structure and dynamic ocular environment and therefore calls for improvement in disease intervention. To address these challenges, development of nanotechnology based nanomedicines and novel nanosystems (liposomes, cubosomes, polymeric and lipidic nanoparticles, nanoemulsions, spanlastics and nano micelles) are currently in progress (some of them are already marketed such as Eye-logic liposomal eye spray@Naturalife, Ireland). Today, it is one of the central concept in designing more accessible formulations for deeper segments of the eyes. These nanosystems has largely enabled the availability of medicaments at required site in a required concentration without inversely affecting the eye tissues; and therefore, attaining the excessive considerations from the formulation scientists and pharmacologists worldwide. The entrapment of drugs, genes, and proteins inside these novel systems is the basis that works at the bio-molecular level bestows greater potential to eradicate disease causatives. In this review, we highlighted the recent attempts of nanotechnology-based systems for treating and managing various ocular ailments. The progress described herein may pave the way to new, highly effective and vital ocular nanosystems.
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Affiliation(s)
- Lida Lalu
- National Institute of Pharmaceutical Education and Research (NIPER) Ahmedabad, An Institute of National Importance, Government of India, Department of Pharmaceuticals, Ministry of Chemicals and Fertilizers, Palaj, Opp. Air Force Station, Gandhinagar 382355, Gujarat, India
| | - Vishakha Tambe
- National Institute of Pharmaceutical Education and Research (NIPER) Ahmedabad, An Institute of National Importance, Government of India, Department of Pharmaceuticals, Ministry of Chemicals and Fertilizers, Palaj, Opp. Air Force Station, Gandhinagar 382355, Gujarat, India
| | - Deepak Pradhan
- National Institute of Pharmaceutical Education and Research (NIPER) Ahmedabad, An Institute of National Importance, Government of India, Department of Pharmaceuticals, Ministry of Chemicals and Fertilizers, Palaj, Opp. Air Force Station, Gandhinagar 382355, Gujarat, India
| | - Kritika Nayak
- National Institute of Pharmaceutical Education and Research (NIPER) Ahmedabad, An Institute of National Importance, Government of India, Department of Pharmaceuticals, Ministry of Chemicals and Fertilizers, Palaj, Opp. Air Force Station, Gandhinagar 382355, Gujarat, India
| | - Suchandra Bagchi
- National Institute of Pharmaceutical Education and Research (NIPER) Ahmedabad, An Institute of National Importance, Government of India, Department of Pharmaceuticals, Ministry of Chemicals and Fertilizers, Palaj, Opp. Air Force Station, Gandhinagar 382355, Gujarat, India
| | - Rahul Maheshwari
- National Institute of Pharmaceutical Education and Research (NIPER) Ahmedabad, An Institute of National Importance, Government of India, Department of Pharmaceuticals, Ministry of Chemicals and Fertilizers, Palaj, Opp. Air Force Station, Gandhinagar 382355, Gujarat, India
| | - Kiran Kalia
- National Institute of Pharmaceutical Education and Research (NIPER) Ahmedabad, An Institute of National Importance, Government of India, Department of Pharmaceuticals, Ministry of Chemicals and Fertilizers, Palaj, Opp. Air Force Station, Gandhinagar 382355, Gujarat, India
| | - Rakesh Kumar Tekade
- National Institute of Pharmaceutical Education and Research (NIPER) Ahmedabad, An Institute of National Importance, Government of India, Department of Pharmaceuticals, Ministry of Chemicals and Fertilizers, Palaj, Opp. Air Force Station, Gandhinagar 382355, Gujarat, India.
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23
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Delivery of Riboflavin-5'-Monophosphate Into the Cornea: Can Liposomes Provide Any Enhancement Effects? J Pharm Sci 2017; 106:3041-3049. [PMID: 28551428 DOI: 10.1016/j.xphs.2017.05.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Revised: 04/24/2017] [Accepted: 05/08/2017] [Indexed: 11/20/2022]
Abstract
Keratoconus is a progressive condition caused by the thinning of the cornea, which eventually deforms the front surface of the eye into a cone shape leading to ghosting, multiple images, glare, and several other vision problems. Currently, keratoconus is treated with UV-induced riboflavin (Rb)-mediated collagen cross-linking, which requires a physical removal of the corneal epithelium under topical anesthesia. This study reports the penetration of Rb and its more water-soluble form, riboflavin-5'-monophosphate (RbP), into the bovine cornea ex vivo. Using ex vivo bovine corneal tissues and 0.8 mg/mL drug solutions in phosphate buffer, it was established that RbP penetration into the cornea within 3 h of diffusion experiment was greater (17.3 ± 0.8 μg) compared with Rb (10.4 ± 4.2 μg). In the cornea, RbP was found to convert to Rb, which is mediated with enzymes present in this tissue. Several formulations including the conventional and propylene glycol-containing liposomes with encapsulated RbP have been developed, and their effect on the drug penetration into the bovine cornea was evaluated. Encapsulation of RbP into the liposomes did not provide any statistically significant improvement in the penetration of RbP into the cornea.
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24
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Theochari I, Goulielmaki M, Danino D, Papadimitriou V, Pintzas A, Xenakis A. Drug nanocarriers for cancer chemotherapy based on microemulsions: The case of Vemurafenib analog PLX4720. Colloids Surf B Biointerfaces 2017; 154:350-356. [PMID: 28365424 DOI: 10.1016/j.colsurfb.2017.03.032] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 03/07/2017] [Accepted: 03/14/2017] [Indexed: 11/16/2022]
Abstract
Oil-in-water (O/W) microemulsions based on Tween 80 as the emulsifier and triacetin as the dispersed oil phase were formulated to be used as delivery vehicles of Vemurafenib analog PLX4720. PLX4720 is a lipophilic antitumor drug against various cancer types correlated with the BRAFV600E mutation. The limits of the single-phase region corresponding to O/W microemulsions as described by ternary phase diagrams were examined. Droplet size measurements determined by dynamic light scattering (DLS) showed mean droplet diameters equal to 10±0.1nm both in the presence and in absence of the drug. Cryogenic-transmission electron microscopy (Cryo-TEM) images of the microemulsions showed the existence of small structures with uniform size distribution having also average diameters of approximately 10nm. Electron paramagnetic resonance (EPR) spectroscopy applying the spin probing technique confirmed PLX4720 location in the oil cores excluding its participation in the surfactants monolayer. Furthermore, cell viability assays on colon cancer cell lines Colo-205 and HT29 showed that microemulsions did not exhibit any cytotoxicity when added in ratios between 0.005% v/v and 0.2% v/v. When the cells were treated with encapsulated PLX4720 at two different concentrations (0.063 and 0.12μΜ) the same response as when dissolved in classic DMSO was observed.
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Affiliation(s)
- Ioanna Theochari
- Institute of Biology, Medicinal Chemistry & Biotechnology, National Hellenic Research Foundation, 48 Vassileos Constantinou Ave., 11635, Athens, Greece
| | - Maria Goulielmaki
- Institute of Biology, Medicinal Chemistry & Biotechnology, National Hellenic Research Foundation, 48 Vassileos Constantinou Ave., 11635, Athens, Greece
| | - Dganit Danino
- Faculty of Biotechnology & Food Engineering, Technion-Israel Institute of Technology, 32000, Haifa, Israel
| | - Vassiliki Papadimitriou
- Institute of Biology, Medicinal Chemistry & Biotechnology, National Hellenic Research Foundation, 48 Vassileos Constantinou Ave., 11635, Athens, Greece.
| | - Alexandros Pintzas
- Institute of Biology, Medicinal Chemistry & Biotechnology, National Hellenic Research Foundation, 48 Vassileos Constantinou Ave., 11635, Athens, Greece
| | - Aristotelis Xenakis
- Institute of Biology, Medicinal Chemistry & Biotechnology, National Hellenic Research Foundation, 48 Vassileos Constantinou Ave., 11635, Athens, Greece
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25
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Hagage-Dobensky D, Aserin A, Garti N. Progesterone solubilization within reverse hexagonal mesophase. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2016.12.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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26
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Predicting solubilisation features of ternary phase diagrams of fully dilutable lecithin linker microemulsions. J Colloid Interface Sci 2017; 495:178-190. [PMID: 28199856 DOI: 10.1016/j.jcis.2017.01.114] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 01/27/2017] [Accepted: 01/30/2017] [Indexed: 11/22/2022]
Abstract
Fully dilutable microemulsions (μEs), used to design self-microemulsifying delivery system (SMEDS), are formulated as concentrate solutions containing oil and surfactants, without water. As water is added to dilute these systems, various μEs are produced (water-swollen reverse micelles, bicontinuous systems, and oil-swollen micelles), without the onset of phase separation. Currently, the formulation dilutable μEs follows a trial and error approach that has had a limited success. The objective of this work is to introduce the use of the hydrophilic-lipophilic-difference (HLD) and net-average-curvature (NAC) frameworks to predict the solubilisation features of ternary phase diagrams of lecithin-linker μEs and the use of these predictions to guide the formulation of dilutable μEs. To this end, the characteristic curvatures (Cc) of soybean lecithin (surfactant), glycerol monooleate (lipophilic linker) and polyglycerol caprylate (hydrophilic linker) and the equivalent alkane carbon number (EACN) of ethyl caprate (oil) were obtained via phase scans with reference surfactant-oil systems. These parameters were then used to calculate the HLD of lecithin-linkers-ethyl caprate microemulsions. The calculated HLDs were able to predict the phase transitions observed in the phase scans. The NAC was then used to fit and predict phase volumes obtained from salinity phase scans, and to predict the solubilisation features of ternary phase diagrams of the lecithin-linker formulations. The HLD-NAC predictions were reasonably accurate, and indicated that the largest region for dilutable μEs was obtained with slightly negative HLD values. The NAC framework also predicted, and explained, the changes in microemulsion properties along dilution lines.
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27
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Abstract
INTRODUCTION Topical administration is the favored route for local delivery of therapeutic agents due to its convenience and affordability. The specific challenge of designing a therapeutic system is to achieve an optimal concentration of a certain drug at its site of action for an appropriate duration. AREAS COVERED This review summarizes innovations from the past 3 years (2012-2015) in the field of topical drug delivery for the treatment of local infections of the vagina, nose, eye and skin. The review also throws some light on the anatomy and physiology of these organs and their various defensive barriers which affect the delivery of drugs administered topically. EXPERT OPINION Topical administration has been gaining attention over the last few years. However, conventional topical drug delivery systems suffer from drawbacks such as poor retention and low bioavailability. The successful formulation of topical delivery products requires the careful manipulation of defensive barriers and selection of a soluble drug carrier. Extensive research is required to develop newer topical drug delivery systems aiming either to improve the efficacy or to reduce side effects compared to current patented systems.
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Affiliation(s)
- Deepinder Singh Malik
- a Department of Pharmaceutical Sciences and Drug Research , Punjabi University , Patiala , India
| | - Neeraj Mital
- a Department of Pharmaceutical Sciences and Drug Research , Punjabi University , Patiala , India
| | - Gurpreet Kaur
- a Department of Pharmaceutical Sciences and Drug Research , Punjabi University , Patiala , India
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