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Strankowska J, Grzywińska M, Łęgowska E, Józefowicz M, Strankowski M. Transport Mechanism of Paracetamol (Acetaminophen) in Polyurethane Nanocomposite Hydrogel Patches-Cloisite ® 30B Influence on the Drug Release and Swelling Processes. MATERIALS (BASEL, SWITZERLAND) 2023; 17:40. [PMID: 38203894 PMCID: PMC10779657 DOI: 10.3390/ma17010040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 12/18/2023] [Accepted: 12/19/2023] [Indexed: 01/12/2024]
Abstract
This article describes the swelling and release mechanisms of paracetamol in polyurethane nanocomposite hydrogels containing Cloisite® 30B (organically modified montmorillonite). The transport mechanism, swelling and release processes of the active substance in nanocomposite matrix were studied using gravimetric and UV-Vis spectroscopic methods. Swelling and release processes depend on the amount of clay nanoparticles in these systems and the degree of crosslinking of PU/PEG/Cloisite® 30B hydrogel nanocomposites. The presence of clay causes, on the one hand, a reduction in free volumes in the polymer matrices, making the swelling process less effective; on the other hand, the high swelling and self-aggregation behavior of Cloisite® 30B and the interactions of paracetamol both with it and with the matrix, cause a change in the transport mechanism from anomalous diffusion to Fickian-like diffusion. A more insightful interpretation of the swelling and release profiles of the active substance was proposed, taking into account the "double swelling" process, barrier effect, and aggregation of clay. It was also proven that in the case of modification of polymer matrices with nanoparticles, the appropriate selection of their concentration is crucial, due to the potential possibility of controlling the swelling and release processes in drug delivery patches.
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Affiliation(s)
- Justyna Strankowska
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk, Wita Stwosza 57, 80-308 Gdańsk, Poland;
| | - Małgorzata Grzywińska
- Neuroinformatics and Artificial Intelligence Lab, Department of Neurophysiology, Neuropsychology and Neuroinformatics, Medical University of Gdańsk, Tuwima 15, 80-210 Gdańsk, Poland
| | - Ewelina Łęgowska
- Academia Copernicana Interdisciplinary Doctoral School, Nicolaus Copernicus University, Lwowska 1, 87-100 Toruń, Poland;
| | - Marek Józefowicz
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk, Wita Stwosza 57, 80-308 Gdańsk, Poland;
| | - Michał Strankowski
- Department of Polymer Technology, Chemical Faculty, Gdańsk University of Technology, G. Narutowicza 11/12, 80-233 Gdańsk, Poland
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Adhikary S, Al Hoque A, Ray M, Paul S, Hossain A, Goswami S, Dey R. Investigation of Paracetamol Entrapped Nanoporous Silica Nanoparticles in Transdermal Drug Delivery System. Appl Biochem Biotechnol 2023; 195:4712-4727. [PMID: 37273095 DOI: 10.1007/s12010-023-04576-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/24/2023] [Indexed: 06/06/2023]
Abstract
An effort was made to administer paracetamol drug through transdermal patch, as no such formulation of this drug has been developed yet. The primary cause for the lack of such formulations is paracetamol's poor aqueous solubility. As a result, the current research concentrated on preparing nanomedicines, or drug-loaded nanoparticles, for delivery via transdermal formulations. Nanoparticles can improve the solubility of weakly aqueous soluble or even aqueous insoluble drugs by changing the crystalline structure of loaded medicines to an amorphous state and serving as drug permeation boosters. Silica nanoparticles (SNPs) were synthesized through sol-gel technique to achieve the aforementioned goal. DLS data revealed that the average particle size was around 100-200 nm, which was sufficient to penetrate the skin barrier. XRD analysis showed that the SNPs were amorphous, and the drug molecules lost their crystallinity after encapsulation into the nanoparticles, causing the enhancement of dissolution of drug molecules in physiological pH (pH-7.4). Different kinetic models were employed for the ex vivo dissolution data to evaluate the suitable kinetic model followed by the drug release in both burst and sustained phase. In vivo analgesic study was executed on mice applying each of the transdermal formulations to examine the performances of the patches.
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Affiliation(s)
- Sourav Adhikary
- School of Materials Science and Nanotechnology, Jadavpur University, Kolkata, India.
| | - Ashique Al Hoque
- Department of Pharmaceutical Technology, Jadavpur University, Kolkata, India
- Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, ND, 58108, USA
| | - Manisheeta Ray
- Department of Pharmaceutical Technology, Jadavpur University, Kolkata, India
| | - Swastik Paul
- Department of Chemical Engineering, University of Calcutta, Kolkata, India
| | - Akbar Hossain
- Department of Chemistry, Jadavpur University, Kolkata, India
| | - Subrata Goswami
- Department of Labour, ESI Institute of Pain Management, Kolkata, India
| | - Rajib Dey
- Metallurgical and Material Engineering Department, Jadavpur University, Kolkata, India
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Lee JS, Kim J, Cui B, Kim SK, Cho SA, An S, Cho SW. Hybrid skin chips for toxicological evaluation of chemical drugs and cosmetic compounds. LAB ON A CHIP 2022; 22:343-353. [PMID: 34904990 DOI: 10.1039/d1lc00550b] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Development of drugs and cosmetics for topical application require safety tests in skin models. However, current skin models, such as skin cell sheets and artificial tissue-engineered skin, do not allow sophisticated toxicological evaluations (e.g., sensory irritation, hepatotoxicity). Animal models are prohibited worldwide for testing cosmetics. Therefore, reliable human skin models that recapitulate physiological events in skin tissue need to be established under in vitro settings. In this study, hybrid human skin models that enable delicate toxicological evaluations of drugs and cosmetic compounds are demonstrated. To recapitulate skin cornification, keratinocytes in the top layer of a vertical microfluidic chip were cultured at the air-liquid interface. For the skin-nerve hybrid model, differentiated neural stem cells in 3D collagen were positioned adjacent to and right below the skin layer. This model enables real-time quantitative skin sensitization analysis following chemical treatments by detecting alterations in neuronal activity in combination with a calcium imaging technique. For the skin-liver model, hepatic cells derived from pluripotent stem cells were cultured in 3D collagen distant from the skin layer. Potential hepatotoxicity of cutaneously applied chemicals in this model can be evaluated by quantification of glutathione and reactive oxygen species. Our study suggests that 3D hybrid skin chips would provide useful human skin models in pharmaceutical and cosmetic industries.
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Affiliation(s)
- Jong Seung Lee
- Department of Biotechnology, Yonsei University, Seoul 03722, Republic of Korea.
| | - Jin Kim
- Department of Biotechnology, Yonsei University, Seoul 03722, Republic of Korea.
| | - Baofang Cui
- Department of Biotechnology, Yonsei University, Seoul 03722, Republic of Korea.
| | - Su Kyeom Kim
- Department of Biotechnology, Yonsei University, Seoul 03722, Republic of Korea.
| | - Sun-A Cho
- Safety & Microbiology Lab, Amorepacific Co. R&D Unit, Yongin 17038, Republic of Korea
| | - Susun An
- Safety & Microbiology Lab, Amorepacific Co. R&D Unit, Yongin 17038, Republic of Korea
| | - Seung-Woo Cho
- Department of Biotechnology, Yonsei University, Seoul 03722, Republic of Korea.
- Center for Nanomedicine, Institute for Basic Science (IBS), Seoul 03722, Republic of Korea
- Graduate Program of Nano Biomedical Engineering (NanoBME), Advanced Science Institute, Yonsei University, Seoul 03722, Republic of Korea
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Pires de Mello CP, Carmona-Moran C, McAleer CW, Perez J, Coln EA, Long CJ, Oleaga C, Riu A, Note R, Teissier S, Langer J, Hickman JJ. Microphysiological heart-liver body-on-a-chip system with a skin mimic for evaluating topical drug delivery. LAB ON A CHIP 2020; 20:749-759. [PMID: 31970354 PMCID: PMC7123528 DOI: 10.1039/c9lc00861f] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Body-on-a-chip in vitro systems are a promising technology that aims to increase the predictive power of drug efficacy and toxicity in humans when compared to traditional animal models. Here, we developed a new heart-liver body-on-a-chip system with a skin surrogate to assess the toxicity of drugs that are topically administered. In order to test the utility of the system, diclofenac, ketoconazole, hydrocortisone and acetaminophen were applied topically through a synthetic skin surrogate (Strat-M membrane) and the toxicity results were compared to those of acute drug exposure from systemically applying the compounds. The heart-liver system was successful in predicting the effects for both cardiac and liver functions changes due to the compounds. The difference in the concentrations of drugs applied topically compared to systemically indicates that the barrier properties of the skin surrogate were efficient. One important advantage of this heart-liver system was the capability of showing differential effects of acute and chronic drug exposure which is necessary as part of the International Conference in Harmonisation (ICH) tri-partate guidelines. In conclusion, this work indicates a promising heart-liver body-on-a-chip system that can be used for the assessment of potential drug toxicity from dermal absorption as well as evaluate transport dynamics through the skin in the same system.
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Affiliation(s)
| | - Carlos Carmona-Moran
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, USA.
| | | | - Julian Perez
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, USA.
| | - Elizabeth A Coln
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, USA.
| | | | - Carlota Oleaga
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, USA.
| | - Anne Riu
- L'Oreal Research, and Innovation Division, Aulnay-sous-Bois, France
| | - Reine Note
- L'Oreal Research, and Innovation Division, Aulnay-sous-Bois, France
| | - Silvia Teissier
- L'Oreal Research, and Innovation Division, Aulnay-sous-Bois, France
| | - Jessica Langer
- L'Oreal Research, and Innovation Division, Clark, NJ, USA
| | - James J Hickman
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, USA. and Hesperos, Inc., Orlando, FL 32826, USA
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A novel double-layered polymeric nanofiber-based dressing with controlled drug delivery for pain management in burn wounds. Polym Bull (Berl) 2019. [DOI: 10.1007/s00289-019-02727-w] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Ravula R, Herwadkar AK, Abla MJ, Little J, Banga AK. Formulation optimization of a drug in adhesive transdermal analgesic patch. Drug Dev Ind Pharm 2015; 42:862-70. [DOI: 10.3109/03639045.2015.1071832] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Ranadheer Ravula
- Department of Pharmaceutical Sciences, College of Pharmacy, Mercer University, Atlanta, GA, USA,
| | - Anushree K. Herwadkar
- Department of Pharmaceutical Sciences, College of Pharmacy, Mercer University, Atlanta, GA, USA,
| | - Mehtab J. Abla
- University of the Arts London, London College of Fashion, London, UK, and
| | | | - Ajay K. Banga
- Department of Pharmaceutical Sciences, College of Pharmacy, Mercer University, Atlanta, GA, USA,
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Delgado-Charro MB, Guy RH. Effective use of transdermal drug delivery in children. Adv Drug Deliv Rev 2014; 73:63-82. [PMID: 24333231 DOI: 10.1016/j.addr.2013.11.014] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 11/29/2013] [Indexed: 12/16/2022]
Abstract
Transdermal administration offers a non-invasive and convenient method for paediatric drug delivery. The competent skin barrier function in term infants and older children limits both water loss and the percutaneous entry of chemicals including drugs; but the smaller doses required by children eases the attainment of therapeutic concentrations. Transdermal patches used in paediatrics include fentanyl, buprenorphine, clonidine, scopolamine, methylphenidate, oestrogens, nicotine and tulobuterol. Some patches have paediatric labelling supported by clinical trials whereas others are used unlicensed. Innovative drug delivery methods, such as microneedles and sonophoresis are being tested for their safety and efficacy; needleless injectors are primarily used to administer growth hormone; and two iontophoretic devices were approved for paediatrics. In contrast, the immature and rapidly evolving skin barrier function in premature neonates represents a significant formulation challenge. Unfortunately, this population group suffers from an absence of approved transdermal formulations, a shortcoming exacerbated by the significant risk of excessive drug exposure via the incompletely formed skin barrier.
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8
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Černíková A, Opatřilová R, Jampílek J. RAPID INFORMATIVE SCREENING OF NANO-ALAPTIDE AS POTENTIAL TRANSDERMAL PERMEATION ENHANCER OF ACETYLSALICYLIC ACID AND PARACETAMOL. ACTA ACUST UNITED AC 2014. [DOI: 10.31482/mmsl.2014.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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9
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Niosomes vs microemulsions: New carriers for topical delivery of Capsaicin. Colloids Surf B Biointerfaces 2011; 87:333-9. [DOI: 10.1016/j.colsurfb.2011.05.041] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2011] [Revised: 05/20/2011] [Accepted: 05/20/2011] [Indexed: 11/18/2022]
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10
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Russell-Jones G, Himes R. Water-in-oil microemulsions for effective transdermal delivery of proteins. Expert Opin Drug Deliv 2011; 8:537-46. [DOI: 10.1517/17425247.2011.559458] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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11
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Patel DP, Setty CM, Mistry GN, Patel SL, Patel TJ, Mistry PC, Rana AK, Patel PK, Mishra RS. Development and evaluation of ethyl cellulose-based transdermal films of furosemide for improved in vitro skin permeation. AAPS PharmSciTech 2009; 10:437-42. [PMID: 19381831 DOI: 10.1208/s12249-009-9224-3] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2008] [Accepted: 03/01/2009] [Indexed: 11/30/2022] Open
Abstract
Transdermal films of the furosemide were developed employing ethyl cellulose and hydroxypropyl methylcellulose as film formers. The effect of binary mixture of polymers and penetration enhancers on physicochemical parameters including thickness, moisture content, moisture uptake, drug content, drug-polymer interaction, and in vitro permeation was evaluated. In vitro permeation study was conducted using human cadaver skin as penetration barrier in modified Keshary-Chein diffusion cell. In vitro skin permeation study showed that binary mixture, ethyl cellulose (EC)/hydroxypropyl methylcellulose (HPMC), at 8.5:1.5 ratio provided highest flux and also penetration enhancers further enhanced the permeation of drug, while propylene glycol showing higher enhancing effect compared to dimethyl sulfoxide and isopropyl myristate. Different kinetic models, used to interpret the release kinetics and mechanism, indicated that release from all formulations followed apparent zero-order kinetics and non-Fickian diffusion transport except formulation without HPMC which followed Fickian diffusion transport. Stability studies conducted as per International Conference on Harmonization guidelines did not show any degradation of drug. Based on the above observations, it can be reasonably concluded that blend of EC-HPMC polymers and propylene glycol are better suited for the development of transdermal delivery system of furosemide.
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12
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Ericsson EM, Faxälv L, Weissenrieder A, Askendal A, Lindahl TL, Tengvall P. Glycerol monooleate–blood interactions. Colloids Surf B Biointerfaces 2009; 68:20-6. [DOI: 10.1016/j.colsurfb.2008.09.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2008] [Revised: 08/18/2008] [Accepted: 09/05/2008] [Indexed: 11/25/2022]
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13
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Silver MR. Coming clean: waterless hand cleaners--which to choose? Am J Med 2008; 121:831-2. [PMID: 18823847 DOI: 10.1016/j.amjmed.2008.03.043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2008] [Revised: 03/08/2008] [Accepted: 03/24/2008] [Indexed: 10/21/2022]
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14
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Ho KY, Dodou K. Rheological studies on pressure-sensitive silicone adhesives and drug-in-adhesive layers as a means to characterise adhesive performance. Int J Pharm 2006; 333:24-33. [PMID: 17049768 DOI: 10.1016/j.ijpharm.2006.09.043] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2005] [Revised: 07/06/2006] [Accepted: 09/26/2006] [Indexed: 11/25/2022]
Abstract
Pressure-sensitive adhesives are viscoelastic polymers used in the formulation of transdermal patches that allow attachment of a patch onto the skin. Established criteria exist that correlate viscoelastic parameters with adhesive performance. In this study, fulfillment of the adhesive performance criteria was examined using two silicone adhesives with different tack properties. The viscoelastic parameters of high and low tack silicone adhesives (BIO-PSA High Tack 7-4302 and BIO-PSA Low Tack 7-4102) were determined and compared with the criteria described by Chu and Dahlquist. Drug-in-adhesive layers were prepared using the high tack adhesive combined with nortriptyline HCl or paracetamol. The effect of drug addition on the viscoelastic properties of the adhesive was examined. The high tack adhesive showed congruence with the established criteria although with a modified range of viscoelastic moduli to that described by Chu. Examination of the low tack adhesive showed that it did not possess the appropriate viscoelastic properties for bonding onto the skin. The addition of the drugs into the high tack adhesive caused a concentration-dependent increase in its cohesive strength. This effect was independent of the physicochemical properties of the drugs tested.
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Affiliation(s)
- Kwong Yat Ho
- Sunderland Pharmacy School, School of Health, Natural and Social Sciences, University of Sunderland, Wharncliffe Street, Sunderland SR1 3SD, UK
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Sintov AC, Brandys-Sitton R. Facilitated skin penetration of lidocaine: Combination of a short-term iontophoresis and microemulsion formulation. Int J Pharm 2006; 316:58-67. [PMID: 16564144 DOI: 10.1016/j.ijpharm.2006.02.034] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2005] [Revised: 01/29/2006] [Accepted: 02/17/2006] [Indexed: 11/23/2022]
Abstract
The objective of this study was to demonstrate the potential of the application of a short-term iontophoresis on the topical delivery of lidocaine hydrochloride from a microemulsion-based system. Five- and 10-min durations of anodal iontophoresis applied onto porcine skin were examined in combination with a microemulsion containing 2.5% lidocaine hydrochloride. A similar combination (10-min iontophoresis with microemulsion in the anodal electrode) was also examined in vivo in a rat model. It was shown in vitro that by combining microemulsion application with a 10-min iontophoresis of 1.13 mA/cm2 electric current density, a significantly increased flux was obtained compared with a combination of aqueous drug solution with the same iontophoresis protocol. In vivo studies revealed that 57.71 +/- 18.65 and 18.43 +/- 9.17 microg cm(-2) were reached in the epidermis and dermis, respectively, at t = 30 min of microemulsion application, when iontophoresis was applied for 10 min. In contrast, the application of aqueous solution-iontophoresis resulted in a relatively lower drug accumulation (21.44 +/- 10.42 and 5.30 +/- 2.25 microg cm(-2) in the epidermis and dermis, respectively, at t = 30) with more rapid clearance of the drug from the skin. Ten-minute application of a low-current electric field on a new topical microemulsion appears to make significant changes in skin permeability. The potential advantages of this procedure include significantly increased flux, accumulation of a large skin drug depot, short lag times, reduced irritation (compared to long-term iontophoresis), simplicity and ease of compliance.
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Affiliation(s)
- Amnon C Sintov
- Department of Pharmacology and School of Pharmacy, E. D. Bergmann Campus, Ben Gurion University of the Negev, P.O. Box 653, Beer Sheva 84105, Israel.
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16
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Sintov AC, Botner S. Transdermal drug delivery using microemulsion and aqueous systems: Influence of skin storage conditions on the in vitro permeability of diclofenac from aqueous vehicle systems. Int J Pharm 2006; 311:55-62. [PMID: 16431047 DOI: 10.1016/j.ijpharm.2005.12.019] [Citation(s) in RCA: 115] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2005] [Revised: 12/04/2005] [Accepted: 12/05/2005] [Indexed: 11/25/2022]
Abstract
The objective of this study was to evaluate the transdermal delivery potential of diclofenac-containing microemulsion system in vivo and in vitro. It was found that the transdermal administration of the microemulsion to rats resulted in 8-fold higher drug plasma levels than those obtained after application of Voltaren Emulgel. After s.c. administration (3.5 mg/kg), the plasma levels of diclofenac reached a peak of 0.94 microg/ml at t=1 h and decreased rapidly to 0.19 microg/ml at t=6 h, while transdermal administration of the drug in microemulsion maintained constant levels of 0.7-0.9 microg/ml for at least 8 h. The transdermal fluxes of diclofenac were measured in vitro using skin excised from different animal species. In three rodent species, penetration fluxes of 53.35+/-8.19 (furry mouse), 31.70+/-3.83 (hairless mouse), 31.66+/-4.45 (rat), and 22.89+/-6.23 microg/cm(2)/h (hairless guinea pig) were obtained following the application of the microemulsion. These fluxes were significantly higher than those obtained by application of the drug in aqueous solution. In contrast to these results, a 'flip-flop' phenomenon was observed when frozen porcine skin (but not fresh skin) was significantly more permeable to diclofenac-in-water than to the drug-in-microemulsion. In fact, the drug penetration from the microemulsion was not affected by the skin storage conditions, but it was increased when an aqueous solution was applied. However, this unusual phenomenon observed in non-freshly used porcine skin places a question mark on its relevancy for in vitro penetration studies involving aqueous vehicle systems.
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Affiliation(s)
- Amnon C Sintov
- Department of Pharmacology and School of Pharmacy, Ben Gurion University of the Negev, P.O. Box 653, Beer Sheva 84105, Israel.
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17
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Clardy SL, Wang X, Zhao W, Liu W, Chase GA, Beard JL, True Felt B, Connor JR. Acute and chronic effects of developmental iron deficiency on mRNA expression patterns in the brain. JOURNAL OF NEURAL TRANSMISSION. SUPPLEMENTUM 2006:173-96. [PMID: 17447428 DOI: 10.1007/978-3-211-33328-0_19] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Because of the multiple biochemical pathways that require iron, iron deficiency can impact brain metabolism in many ways. The goal of this study was to identify a molecular footprint associated with ongoing versus long term consequences of iron deficiency using microarray analysis. Rats were born to iron-deficient mothers, and were analyzed at two different ages: 21 days, while weaning and iron-deficient; and six months, after a five month iron-sufficient recovery period. Overall, the data indicate that ongoing iron deficiency impacts multiple pathways, whereas the long term consequences of iron deficiency on gene expression are more limited. These data suggest that the gene array profiles obtained at postnatal day 21 reflect a brain under development in a metabolically compromised setting that given appropriate intervention is mostly correctable. There are, however, long term consequences to the developmental iron deficiency that could underlie the neurological deficits reported for iron deficiency.
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Affiliation(s)
- S L Clardy
- Department of Neurosurgery, M.S. Hershey Medical Center, Hershey, USA
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18
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Sintov AC, Shapiro L. New microemulsion vehicle facilitates percutaneous penetration in vitro and cutaneous drug bioavailability in vivo. J Control Release 2004; 95:173-83. [PMID: 14980766 DOI: 10.1016/j.jconrel.2003.11.004] [Citation(s) in RCA: 152] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2003] [Accepted: 11/12/2003] [Indexed: 11/21/2022]
Abstract
Microemulsion systems possessing a potentially improved skin bioavailability of lidocaine were designed and explored for some characteristics. The existence of microemulsion regions was investigated in quaternary systems composed of glyceryl oleate+polyoxyl 40 fatty acid derivatives (surfactants)/tetraglycol (co-surfactant)/isopropyl palmitate/water by constructing pseudo-ternary phase diagrams at fixed co-surfactant/surfactants (CoS/S) ratios. Light scattering measurements used to determine the diameter of the internal phase revealed that lidocaine in the microemulsions increased the droplet size, implying a drug tendency to accumulate in the interfacial layers. Percutaneous penetration studies using rat skin in vitro showed that the transdermal flux of lidocaine was significantly improved by microemulsion composed of the glyceryl oleate-PEG-40 stearate combination rather than glyceryl oleate-PEG-40 hydroxylated castor oil. Two principal factors were found to govern the transdermal penetration of lidocaine from the microemulsion: water content and the CoS/S ratio. By analyzing skin layers (epidermis and dermis) for lidocaine content, significantly higher concentrations were found after rats were treated in vivo with liquid microemulsions (CoS/S=1.8, 30 wt.% water) or patches compared to those measured after application of EMLA cream. It has been suggested, therefore, that these microemulsions loaded with lidocaine would provide adequate analgesia in relatively shorter periods of time.
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Affiliation(s)
- Amnon C Sintov
- The Institutes for Applied Research, Ben Gurion University of the Negev, P.O. Box 653, Beer Sheva 84105, Israel.
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Abdulmajed K, Heard CM. Topical delivery of retinyl ascorbate co-drug. Int J Pharm 2004; 280:113-24. [PMID: 15265552 DOI: 10.1016/j.ijpharm.2004.05.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2003] [Revised: 04/15/2004] [Accepted: 05/10/2004] [Indexed: 10/26/2022]
Abstract
A novel synthetic technique was used to synthesise the co-drug retinyl ascorbate (RA-AsA) ester from all-trans-retinyl chloride (RA) and L-ascorbic acid (AsA) suspended in ethanol at low temperature. Its log P, solubility in a Me:PBS, 50/50 at pH 4.8 and degradation constant were determined. The flux and permeation coefficient were determined using heat separated human skin membrane, and skin penetration was determined by tape stripping using full thickness human. All experiments were performed in parallel with retinyl palmitate (Rol-Pal) and ascorbyl palmitate (AsA-Pal), which are used in commercial topical formulations. RA-AsA exhibited favourable log P (2.2), with stability much greater than RA and AsA, but similar stability to Rol-Pal and AsA-Pal. The flux of RA-AsA was lower than for Rol-Pal and AsA-Pal. RA-AsA also demonstrated higher skin retention than the other two esters, but delivered more RA and AsA to the viable epidermis than retinol from Rol-Pal and ascorbic acid from AsA-Pal. Overall, the data suggest the potential value of RA-AsA co-drug for the purpose of treating damage to skin resulting from UV-induced production of free radicals.
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Affiliation(s)
- Kasem Abdulmajed
- Welsh School of Pharmacy, Cardiff University, Cardiff CF10 3XF, UK
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