1
|
Azehaf H, Benzine Y, Tagzirt M, Skiba M, Karrout Y. Microbiota-sensitive drug delivery systems based on natural polysaccharides for colon targeting. Drug Discov Today 2023; 28:103606. [PMID: 37146964 DOI: 10.1016/j.drudis.2023.103606] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 04/22/2023] [Accepted: 04/27/2023] [Indexed: 05/07/2023]
Abstract
Colon targeting is an ongoing challenge, particularly for the oral administration of biological drugs or local treatment of inflammatory bowel disease (IBD). In both cases, drugs are known to be sensitive to the harsh conditions of the upper gastrointestinal tract (GIT) and, thus, must be protected. Here, we provide an overview of recently developed colonic site-specific drug delivery systems based on microbiota sensitivity of natural polysaccharides. Polysaccharides act as a substrate for enzymes secreted by the microbiota located in the distal part of GIT. The dosage form is adapted to the pathophysiology of the patient and, thus, a combination of bacteria-sensitive and time-controlled release or pH-dependent systems can be used for delivery.
Collapse
Affiliation(s)
- Hajar Azehaf
- University of Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - Youcef Benzine
- University of Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - M Tagzirt
- University of Lille, Inserm, CHU Lille, U1011, Institut Pasteur de Lille, U1011-EGID, F-59000 Lille, France
| | - M Skiba
- University of Rouen, Galenic Pharmaceutical Team, INSERM U1239, UFR of Health, 22 Boulevard Gambetta, 76000 Rouen, France
| | - Youness Karrout
- University of Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France.
| |
Collapse
|
2
|
Trombino S, Sole R, Di Gioia ML, Procopio D, Curcio F, Cassano R. Green Chemistry Principles for Nano- and Micro-Sized Hydrogel Synthesis. Molecules 2023; 28:molecules28052107. [PMID: 36903352 PMCID: PMC10004334 DOI: 10.3390/molecules28052107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 01/26/2023] [Accepted: 01/26/2023] [Indexed: 03/06/2023] Open
Abstract
The growing demand for drug carriers and green-technology-based tissue engineering materials has enabled the fabrication of different types of micro- and nano-assemblies. Hydrogels are a type of material that have been extensively investigated in recent decades. Their physical and chemical properties, such as hydrophilicity, resemblance to living systems, swelling ability and modifiability, make them suitable to be exploited for many pharmaceutical and bioengineering applications. This review deals with a brief account of green-manufactured hydrogels, their characteristics, preparations, importance in the field of green biomedical technology and their future perspectives. Only hydrogels based on biopolymers, and primarily on polysaccharides, are considered. Particular attention is given to the processes of extracting such biopolymers from natural sources and the various emerging problems for their processing, such as solubility. Hydrogels are catalogued according to the main biopolymer on which they are based and, for each type, the chemical reactions and the processes that enable their assembly are identified. The economic and environmental sustainability of these processes are commented on. The possibility of large-scale processing in the production of the investigated hydrogels are framed in the context of an economy aimed at waste reduction and resource recycling.
Collapse
|
3
|
Wang Q, Zhang P, Javed Ansari M, Aldawsari MF, Alalaiwe AS, Kaur J, Kumar R, Ng Kay Lup A, Enayati A, Mirzaei H, Soltani A, Su CH, Nguyen HC. Electrostatic interaction assisted Ca-decorated C20 fullerene loaded to anti-inflammatory drugs to manage cardiovascular disease risk in rheumatoid arthritis patients. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.118564] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
4
|
Improved antibacterial activity of sulfasalazine loaded fullerene derivative: computational and experimental studies. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118083] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
5
|
Asgharzadeh F, Hashemzadeh A, Rahmani F, Yaghoubi A, Nazari SE, Avan A, Mehr SMH, Soleimanpour S, Khazaei M. Cerium oxide nanoparticles acts as a novel therapeutic agent for ulcerative colitis through anti-oxidative mechanism. Life Sci 2021; 278:119500. [PMID: 33862111 DOI: 10.1016/j.lfs.2021.119500] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 03/25/2021] [Accepted: 03/30/2021] [Indexed: 10/21/2022]
Abstract
BACKGROUND Cerium (IV) oxide (CeO2) exhibit anti-inflammatory activity via scavenge free radicals and decreasing the oxygen species (ROS) production. Here we aimed to exhibit the therapeutic effect of this nanoparticle in experimental colitis models. METHODS Cerium oxide nanoparticles (CeONPs) were synthesized via using UiO-66 as a precursor. We used dextran sodium sulfate (DSS) to induce colitis in experimental models to investigate the anti-inflammatory effect of CeONPs. Colitis models are divided into four groups to receive the treatment, including control, colitis, cerium oxide, and sulfasalazine. We evaluated the therapeutic effects of CeONPs for the increased colitis clinical symptoms and attenuated the histological damage to colon tissue in colitis. RESULT This nanoparticle was significantly able to reduce the clinical symptoms of colitis. Moreover, CeONPs can enhance the disease activity index such as body lose weight, diarrhea, rectal bleeding, colon length, and spleen weight. Moreover, CeONPs showed a significant reduction in the histological characteristics of the colitis models. CONCLUSION These results suggest that CeONPs can be considered as promising therapeutic agents in treating the ulcerative colitis.
Collapse
Affiliation(s)
- Fereshteh Asgharzadeh
- Department of Physiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Alireza Hashemzadeh
- Department of Physiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Farzad Rahmani
- Department of Biochemistry, Faculty of Medicine, Iranshahr University of Medical Sciences, Iranshahr, Iran
| | - Atieh Yaghoubi
- Antimicrobial Resistance Research Center, Bu-Ali Research Institute, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Microbiology and Virology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Seyedeh Elnaz Nazari
- Department of Physiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Amir Avan
- Metabolic Syndrome Research Center, Mashhad University of Medical Sciences, Mashhad, Iran; Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Medical Genetics and Molecular Medicine, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Seyed Mahdi Hasanian Mehr
- Metabolic Syndrome Research Center, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Medical Biochemistry, Mashhad University of Medical Sciences, Mashhad, Iran; Neurogenic Inflammation Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Saman Soleimanpour
- Antimicrobial Resistance Research Center, Bu-Ali Research Institute, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Microbiology and Virology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Majid Khazaei
- Department of Physiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran; Metabolic Syndrome Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
| |
Collapse
|
6
|
Yaghoubi A, Davoodi J, Asgharzadeh F, Rezaie S, Nazari E, Khazaei M, Soleimanpour S. Therapeutic effect of an anti-tuberculosis agent, isoniazid, and its nano-isoform in ulcerative colitis. Int Immunopharmacol 2021; 96:107577. [PMID: 33812254 DOI: 10.1016/j.intimp.2021.107577] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 03/04/2021] [Accepted: 03/08/2021] [Indexed: 12/14/2022]
Abstract
BACKGROUND Isoniazid (INH) is well known as a first-line anti-tuberculosis, while some studies demonstrate that it has anti-inflammatory activity via a different mechanism such as inhibitionthe production of IL-1, ROS, activation of PPARγ expression, inhibition of the transcriptional regulatory activity of NF-κB and AP-1. The aim of this study, investigate the anti-inflammatory effect of INH and INH combined with Sulfasalazine-loaded nanoparticles (NPs) in the ulcerative colitis mouse model. METHODS To investigate the anti-inflammatory effect of INH and NPs in the ulcerative colitis mice model, we evaluated the effect of INH clinical symptoms and colonic mucosal histology in colitis. RESULT The present study demonstrates that combination therapy of INH with sulfasalazine as well as NPs reduces the symptom of ulcerative colitis and improved disease activity index include body lose weight, diarrhea, rectal bleeding, colonic length, spleen weight, and colon histopathological score in DSS-induced colitis mice model. CONCLUSION Our results suggest that the nanoforms of INH with sulfasalazine enhances the therapeutic effect of the drugs in the treatment of ulcerative colitis.
Collapse
Affiliation(s)
- Atieh Yaghoubi
- Antimicrobial Resistance Research Center, Bu-Ali Research Institute, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Microbiology and Virology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Javid Davoodi
- Department of Pharmaceutics, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Fereshteh Asgharzadeh
- Department of Physiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Sajad Rezaie
- Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Elnaz Nazari
- Department of Physiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Majid Khazaei
- Department of Physiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Saman Soleimanpour
- Antimicrobial Resistance Research Center, Bu-Ali Research Institute, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Microbiology and Virology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
| |
Collapse
|
7
|
Chaubey P, Momin M, Sawarkar S. Significance of Ligand-Anchored Polymers for Drug Targeting in the Treatment of Colonic Disorders. Front Pharmacol 2020; 10:1628. [PMID: 32161536 PMCID: PMC7052366 DOI: 10.3389/fphar.2019.01628] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Accepted: 12/13/2019] [Indexed: 12/26/2022] Open
Abstract
Treatment of a variety of bowel diseases like Crohn's disease, ulcerative colitis, colonic cancers, colonic pathologies, and systemic delivery of drugs at the target sites can be done with the help of targeted drug delivery technique. Conventional colon specific drug delivery systems lack specificity and release significant amount of drug prior reaching the target site. Hence, efficient drug delivery system that ensures effective release of the drug at the colon is still a sought after research arena. Ligand anchored therapy is a strong and effective approach to execute drug delivery in selective target cells, for both, diagnostic, as well as therapeutic reasons. Compared to the regular drugs, such ligand anchored therapy provides added benefit of minimum toxicity and few side effects. Discovery of overexpressed receptors on diseased cells, as compared to healthy cells led to the emergence of active drug targeting. Further, drug resistance constitutes one of the major reasons of the failure of chemotherapy and presents a major obstacle for the effective treatment. The reason behind drug resistance is exposure of pathological cells/pathogens to sub-therapeutic levels of drugs due lack of specificity of therapeutics. Active targeting, specifically taken up by the target cells, can warrant exposure of pathological cells/pathogens to high drug load at the target and sparing non-target cells hence minimal damage to normal cells and least chance of drug resistance. Many ligands like antibodies, aptamers, peptides, folate, and transferrin have been discovered in the past few years. The design of nanocarriers can be incorporated with many different functions which enables functions like imaging and triggered intracellular drug release. The present review article focuses on advances in ligand anchored therapy and its significance on the progress of targeted nanocarriers. It will also establish novel concepts like multi-targeting and multi-functional nanocarriers for the treatment of colonic disorders.
Collapse
Affiliation(s)
- Pramila Chaubey
- Department of Pharmaceutics, College of Pharmacy, Shaqra University, Al-Dawadmi, Saudi Arabia
| | - Munira Momin
- Department of Pharmaceutics, SVKM’s Dr. Bhanuben Nanavati College of Pharmacy, Mumbai, India
| | - Sujata Sawarkar
- Department of Pharmaceutics, SVKM’s Dr. Bhanuben Nanavati College of Pharmacy, Mumbai, India
| |
Collapse
|
8
|
Priyam A, Shivhare K, Yadav S, Sharma AK, Kumar P. Enhanced solubility and self-assembly of amphiphilic sulfasalazine-PEG-OMe (S-PEG) conjugate into core-shell nanostructures useful for colonic drug delivery. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.03.048] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
9
|
Bajpai SK, Saxena S, Dubey S. A Novel Approach to Study Enzymatic Degradation of Ter-polymeric Beads for Gastrointestinal Drug Delivery: Synthesis and Characterization. J BIOACT COMPAT POL 2016. [DOI: 10.1177/0883911506064370] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The α-amylase induced enzymatic degradation of terpolymeric beads, composed of calcium alginate, starch and poly(ethylene) glycol, were studied for gastrointestinal drug delivery. The beads demonstrated faster degradation with increased enzyme activity in the range 0.64 to 2.24IU/mL. A linear relationship of the degradation rates and corresponding enzyme concentration indicate that degradation is governed by Michaelis-Menten kinetics. The degradation rate was enhanced with increases in starch content in the beads. The smaller value of KM (3.15 × 10−5 mol−1 dm−3) indicated higher enzyme-substrate affinity. The beads crosslinked with barium ions demonstrated slower degradation due to a higher degree of crosslinking in the beads. With increases in initial water content, the degradation was found to increase. In order to incorporate in vivo GI conditions, the degradation was also studied using a flow through diffusion cell (FTDC). The hydrogel beads exhibited slower degradation by FTDC compared to traditional in vitro methods and the degradation was dependent on the nature of the filler particles used in the diffusion cell.
Collapse
Affiliation(s)
- S. K. Bajpai
- Polymer Research Laboratory, Department of Chemistry, Government Model Science College (Autonomous), Jabalpur (M.P.) – 482001, India
| | | | - Seema Dubey
- Polymer Research Laboratory, Department of Chemistry, Government Model Science College (Autonomous), Jabalpur (M.P.) – 482001, India
| |
Collapse
|
10
|
Bashir S, Teo YY, Ramesh S, Ramesh K, Khan AA. N-succinyl chitosan preparation, characterization, properties and biomedical applications: a state of the art review. REV CHEM ENG 2015. [DOI: 10.1515/revce-2015-0016] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractN-succinyl chitosan (NSC) remains a promising chitosan derivative to develop targeted drug delivery, wound dressings, and tissue engineering systems. All these systems are important in life sciences. NSC is an amphiprotic derivative obtained from the N-acylation of chitosan. NSC exhibits extraordinary biocompatibility, significantly increased aqueous solubility in acidic and basic media without affecting the biological properties, appreciable transfection efficiency, and the ability to stimulate osteogenesis. NSC shows enhanced bioavailability, which highlights its potential applications in the biomedical field. This review briefly introduces chitosan, including its limitations as a biomaterial, and modifications of chitosan with a particular focus on acylation, along with a comprehensive overview of the synthesis, characterization, properties, biodistribution, and toxicological/biopharmaceutical profile of NSC. Furthermore, it extensively surveys current state-of-the-art NSC-based formulations for drug delivery with special emphasis on protein delivery, anti-cancer activity in the colon, as well as nasal and ophthalmic targeted gene/drug delivery. Moreover, it discusses NSC-based biomaterial applications in articular, adipose, and bone tissue engineering. In addition, it describes recent contributions of NSC-based hydrogels in wound dressings along with a brief account of drug delivery in combination with tissue engineering. Finally, it presents potential current challenges and future perspectives of NSC-based formulations in the biomedical field.
Collapse
|
11
|
Tsume Y, Mudie DM, Langguth P, Amidon GE, Amidon GL. The Biopharmaceutics Classification System: subclasses for in vivo predictive dissolution (IPD) methodology and IVIVC. Eur J Pharm Sci 2014; 57:152-63. [PMID: 24486482 DOI: 10.1016/j.ejps.2014.01.009] [Citation(s) in RCA: 196] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Revised: 01/16/2014] [Accepted: 01/22/2014] [Indexed: 01/03/2023]
Abstract
The Biopharmaceutics Classification System (BCS) has found widespread utility in drug discovery, product development and drug product regulatory sciences. The classification scheme captures the two most significant factors influencing oral drug absorption; solubility and intestinal permeability and it has proven to be a very useful and a widely accepted starting point for drug product development and drug product regulation. The mechanistic base of the BCS approach has, no doubt, contributed to its wide spread acceptance and utility. Nevertheless, underneath the simplicity of BCS are many detailed complexities, both in vitro and in vivo which must be evaluated and investigated for any given drug and drug product. In this manuscript we propose a simple extension of the BCS classes to include sub-specification of acid (a), base (b) and neutral (c) for classes II and IV. Sub-classification for Classes I and III (high solubility drugs as currently defined) is generally not needed except perhaps in border line solubility cases. It is well known that the , pKa physical property of a drug (API) has a significant impact on the aqueous solubility dissolution of drug from the drug product both in vitro and in vivo for BCS Class II and IV acids and bases, and is the basis, we propose for a sub-classification extension of the original BCS classification. This BCS sub-classification is particularly important for in vivo predictive dissolution methodology development due to the complex and variable in vivo environment in the gastrointestinal tract, with its changing pH, buffer capacity, luminal volume, surfactant luminal conditions, permeability profile along the gastrointestinal tract and variable transit and fasted and fed states. We believe this sub-classification is a step toward developing a more science-based mechanistic in vivo predictive dissolution (IPD) methodology. Such a dissolution methodology can be used by development scientists to assess the likelihood of a formulation and dosage form functioning as desired in humans, can be optimized along with parallel human pharmacokinetic studies to set a dissolution methodology for Quality by Design (QbD) and in vitro-in vivo correlations (IVIVC) and ultimately can be used as a basis for a dissolution standard that will ensure continued in vivo product performance.
Collapse
Affiliation(s)
- Yasuhiro Tsume
- College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, United States
| | - Deanna M Mudie
- College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, United States
| | - Peter Langguth
- Department of Pharmaceutical Technology and Biopharmaceutics, Johannes Gutenberg University Mainz, Staudinger Weg 5, Mainz D-55099, Germany
| | - Greg E Amidon
- College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, United States
| | - Gordon L Amidon
- College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, United States.
| |
Collapse
|
12
|
Mrózek L, Coufalová L, Rárová L, Plaček L, Opatřilová R, Dohnal J, Kráľová K, Paleta O, Král V, Drašar P, Jampílek J. New polyfluorothiopropanoyloxy derivatives of 5β-cholan-24-oic acid designed as drug absorption modifiers. Steroids 2013; 78:832-44. [PMID: 23707574 DOI: 10.1016/j.steroids.2013.05.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Revised: 05/04/2013] [Accepted: 05/09/2013] [Indexed: 11/26/2022]
Abstract
A series of final six propanoyloxy derivatives of 5β-cholan-24-oic acid (tridecafluoroctylsulfanyl- and tridecafluoroctylsulfinylethoxycarbonylpropanoyloxy derivatives) as potential drug absorption promoters (skin penetration enhancers, intestinal absorption promoters) was generated by multistep synthesis. Structure confirmation of all generated compounds was accomplished by (1)H NMR, (13)C NMR, IR and MS spectroscopy methods. All the prepared compounds were analyzed using RP-TLC, and their lipophilicity (RM) was determined. The hydrophobicity (log P), solubility (logS), polar surface area (PSA) and molar volume (MV) of the studied compounds were also calculated. All the target compounds were tested for their in vitro transdermal penetration effect and as potential intestinal absorption enhancers. The cytotoxicity of all the evaluated compounds was evaluated against normal human skin fibroblast cells. Their anti-proliferative activity was also assessed against human cancer cell lines: T-lymphoblastic leukaemia cell line and breast adenocarcinoma cell line. One compound showed high selective cytotoxicity against human skin fibroblast cells and another compound possessed high cytotoxicity against breast adenocarcinoma cell line and skin fibroblast cells. Only one compound expressed anti-proliferative effect on leukaemia and breast adenocarcinoma cells without affecting the growth of normal cells, which should be promising in potential development of new drugs. Most of the target compounds showed minimal anti-proliferative activity (IC50>37μM), indicating they would have moderate cytotoxicity when administered as chemical absorption modifiers. The relationships between the lipophilicity/polarity and the chemical structure of the studied compounds as well as the relationships between their chemical structure and penetration enhancement effect are discussed in this article.
Collapse
Affiliation(s)
- Lech Mrózek
- BorsodChem MCHZ, s.r.o., Chemická 1/2039, 709 03 Ostrava-Mariánské Hory, Czech Republic.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Bortolin A, Aouada FA, Mattoso LHC, Ribeiro C. Nanocomposite PAAm/methyl cellulose/montmorillonite hydrogel: evidence of synergistic effects for the slow release of fertilizers. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:7431-7439. [PMID: 23822729 DOI: 10.1021/jf401273n] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In this work, we synthesized a novel series of hydrogels composed of polyacrylamide (PAAm), methylcellulose (MC), and calcic montmorillonite (MMt) appropriate for the controlled release of fertilizers, where the components presented a synergistic effect, giving very high fertilizer loading in their structure. The synthesized hydrogel was characterized in relation to morphological, hydrophilic, spectroscopic, structural, thermal, and kinetic properties. After those characterizations, the application potential was verified through sorption and desorption studies of a nitrogenated fertilizer, urea (CO(NH2)2). The swelling degree results showed that the clay loading considerably reduces the water absorption capability; however, the hydrolysis process favored the urea adsorption in the hydrogel nanocomposites, increasing the load content according to the increase of the clay mass. The FTIR spectra indicated that there was incorporation of the clay with the polymeric matrix of the hydrogel and that incorporation increased the water absorption speed (indicated by the kinetic constant k). By an X-ray diffraction technique, good nanodispersion (intercalation) and exfoliation of the clay platelets in the hydrogel matrix were observed. Furthermore, the presence of the montmorillonite in the hydrogel caused the system to liberate the nutrient in a more controlled manner than that with the neat hydrogel in different pH ranges. In conclusion, excellent results were obtained for the controlled desorption of urea, highlighting the hydrolyzed hydrogels containing 50% calcic montmorillonite. This system presented the best desorption results, releasing larger amounts of nutrient and almost 200 times slower than pure urea, i.e., without hydrogel. The total values of nutrients present in the system show that this material is potentially viable for application in agriculture as a nutrient carrier vehicle.
Collapse
Affiliation(s)
- Adriel Bortolin
- Departamento de Química, Universidade Federal de São Carlos , 13565-905, São Carlos, SP, Brazil
| | | | | | | |
Collapse
|
14
|
Coufalová L, Mrózek L, Rárová L, Plaček L, Opatřilová R, Dohnal J, Král'ová K, Paleta O, Král V, Drašar P, Jampílek J. New propanoyloxy derivatives of 5β-cholan-24-oic acid as drug absorption modifiers. Steroids 2013; 78:435-53. [PMID: 23435200 DOI: 10.1016/j.steroids.2013.02.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2012] [Revised: 01/18/2013] [Accepted: 02/09/2013] [Indexed: 11/16/2022]
Abstract
A series of final twelve propanoyloxy derivatives of 5β-cholan-24-oic acid (O-propanoyl derivatives of cholic acid) as potential drug absorption modifiers (skin penetration enhancers, intestinal absorption promoters) was generated by multistep synthesis. Structure confirmation of all generated compounds was accomplished by 1H NMR, 13C NMR, IR and MS spectroscopy methods. All the prepared compounds were analyzed using RP-TLC, and their lipophilicity (RM) was determined. The hydrophobicity (log P), solubility (log S), polar surface area (PSA) and molar volume (MV) of the studied compounds were also calculated. All the target compounds were tested for their in vitro transdermal penetration effect and as potential intestinal absorption enhancers. The cytotoxicity of all the evaluated compounds was evaluated against normal human skin fibroblast cells. Their anti-proliferative activity was also assessed against human cancer cell lines: T-lymphoblastic leukemia cell line and breast adenocarcinoma cell line. One compound showed selective cytotoxicity against human skin fibroblast cells and another compound possessed the highest cytotoxicity against all the tested cell lines. Only one compound expressed anti-proliferative effect on leukemia cancer cells without affecting the growth of normal cells, which should be promising in potential development of new drugs. Most of the target compounds showed minimal anti-proliferative activity (IC50>37 μM), indicating they would have moderate cytotoxicity when administered as chemical absorption modifiers. The relationships between the lipophilicity/polarity and the chemical structure of the studied compounds as well as the relationships between their chemical structure and enhancement effect are discussed in this article.
Collapse
Affiliation(s)
- Lenka Coufalová
- Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho 1/3, 612 42 Brno, Czech Republic.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Krishnaiah YSR, Khan MA. Strategies of targeting oral drug delivery systems to the colon and their potential use for the treatment of colorectal cancer. Pharm Dev Technol 2012; 17:521-40. [PMID: 22681390 DOI: 10.3109/10837450.2012.696268] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Colorectal cancer (CRC) is the third most common cause of cancer-related death in both men and women. Often, surgical intervention remains the choice in treating CRC. Traditional dosage forms used for treating CRC deliver drug to wanted as well as unwanted sites of drug action resulting in several adverse side effects. Targeted oral drug delivery systems are being investigated to target and deliver chemotherapeutic and chemopreventive agents directly to colon and rectum. Site-specific delivery of a drug to colon increases its concentration at the target site, and thus requires a lower dose with reduced incidence of side effects. The major obstacle to be overcome for successful targeting of drug to colon through oral route is that drug absorption/degradation must be avoided in stomach and small intestine before the dosage form reaches colon. The review includes discussion of physiological factors that must be considered when targeting drugs directly to colorectal region, an outline on drugs used for treatment and prevention of CRC, and a brief description of various types of colon-targeted oral drug delivery systems. The focus is on the assessment of various formulation approaches being investigated for oral colon-specific delivery of drugs used in the treatment and prevention of CRC.
Collapse
Affiliation(s)
- Yellela S R Krishnaiah
- Division of Product Quality Research, Office of Testing and Research, Office of Pharmaceutical Science, Center for Drug Evaluation and Research, Food and Drug Administration, Silver Springs, MD 20993, USA.
| | | |
Collapse
|
16
|
Schoener CA, Hutson HN, Peppas NA. pH-Responsive Hydrogels with Dispersed Hydrophobic Nanoparticles for the Delivery of Hydrophobic Therapeutic Agents. POLYM INT 2012; 61:874-879. [PMID: 23087546 DOI: 10.1002/pi.4219] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
To investigate the delivery of hydrophobic therapeutic agents, a new class of polymer carriers was synthesized. These carriers are composed of two components: (i) a pH-responsive hydrogel composed of methacrylic acid grafted with poly(ethylene glycol) tethers, P(MAA-g-EG), and (ii) hydrophobic poly(methyl methacrylate) (PMMA) nanoparticles. Before the P(MAA-g-EG) hydrogel was crosslinked, PMMA nanoparticles were added to the solution and upon exposure to UV light they were photoencapsulated throughout the P(MAA-g-EG) hydrogel structure. The pH-responsive behavior of P(MAA-g-EG) is capable of triggered release of a loaded therapeutic agent, such as a low molecular weight drug or protein, when it passes from the stomach (low pH) to upper small intestine (neutral pH). The introduction of PMMA nanoparticles into the hydrogel structure affected the swelling behavior, therapeutic agent loading efficiency, and solute release profiles. In equilibrium swelling conditions the swelling ratio of nanoparticle-containing hydrogels decreased with increasing nanoparticle content. Loading efficiencies of the model therapeutic agent fluorescein ranged from 38 - 51 % and increased with increasing hydrophobic content. Release studies from neat P(MAA-g-EG) and the ensuing P(MAA-g-EG) hydrogels containing nanoparticles indicated that the transition from low pH (2.0) to neutral pH (7.0) triggered fluorescein release. Maximum fluorescein release depended on the structure and hydrophobicity of the carriers used in these studies.
Collapse
Affiliation(s)
- Cody A Schoener
- Department of Chemical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
| | | | | |
Collapse
|
17
|
Singh B, Lal H, Pal L, Sharma V. In vitro release profile of anti-ulcer drug rabeprazole from biocompatible psyllium-PVA hydrogels. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:1021-1032. [PMID: 22367108 DOI: 10.1007/s10856-012-4582-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2011] [Accepted: 02/06/2012] [Indexed: 05/31/2023]
Abstract
The present article discusses the synthesis, characterization and haemocompatibility behaviour of the psyllium-PVA hydrogels prepared by chemical method in the presence of N,N'-methylenebisacrylamide. These hydrogels have been characterized by Fourier Transform infrared spectroscopy, thermo gravimetric analysis, swelling and drug release studies. The release of model drug rabeprazole sodium from the drug loaded hydrogels occurred through non-Fickian diffusion mechanism. Psyllium itself acts as anti-ulcer agent and release of rabeprazole from the drug loaded hydrogels may enhance the curing potential of the drug delivery device. The haemocompatibility was evaluated by studying the blood interactions with hydrogels with reference to thrombogenicity and haemolytic potential. Thrombogenicity results indicate that hydrogels are non-thrombogenic as the weight of clot formed and thrombus percentage for hydrogels was less than the positive control. The haemolytic index has been observed <5%. These observations indicate that these hydrogels are haemo-compatible and hence could be used for oral administration of antiulcer drugs.
Collapse
Affiliation(s)
- Baljit Singh
- Department of Chemistry, Himachal Pradesh University, Shimla, India.
| | | | | | | |
Collapse
|
18
|
Schoener C, Peppas N. Oral delivery of chemotherapeutic agents: background and potential of drug delivery systems for colon delivery. J Drug Deliv Sci Technol 2012. [DOI: 10.1016/s1773-2247(12)50081-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
19
|
|
20
|
Schoener CA, Hutson HN, Fletcher GK, Peppas NA. Amphiphilic Interpenetrating Networks for the Delivery of Hydrophobic, Low Molecular Weight Therapeutic Agents. Ind Eng Chem Res 2011; 50:12556-12561. [PMID: 22247592 DOI: 10.1021/ie201593h] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
To investigate the delivery of hydrophobic therapeutic agents, a novel class of interpenetrating networks (IPNs) were synthesized and composed of two networks: methacrylic acid grafted with poly(ethylene glycol) tethers, P(MAA-g-EG), and poly(n-butyl acrylate) (PBA). The hydrophilic P(MAA-g-EG) networks are pH-responsive hydrogels capable of triggered release of an encapsulated therapeutic agent, such as a low molecular weight drug or a protein, when it passes from the stomach (low pH) to upper small intestine (neutral pH). PBA is a hydrophobic homopolymer that can affect the IPN swelling behavior, the therapeutic agent loading efficiencies in IPNs, and solute release profiles from IPNs. In dynamic swelling conditions, IPNs had greater swelling ratios than P(MAA-g-EG), but in equilibrium swelling conditions the IPN swelling ratio decreased with increasing PBA content. Loading efficiencies of the model therapeutic agent fluorescein ranged from 21 - 44%. Release studies from neat P(MAA-g-EG) and the ensuing IPNs indicated that the transition from low pH (2.0) to neutral pH (7.0) triggered fluorescein release. Maximum fluorescein release depended on the structure and hydrophilicity of the carriers used in these studies.
Collapse
Affiliation(s)
- Cody A Schoener
- Department of Chemical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
| | | | | | | |
Collapse
|
21
|
Abstract
INTRODUCTION Recently, pharmacotherapy has advanced extensively, but there are still many refractory diseases which cannot be solved fully by existing therapeutic agents. Therefore, alternative medicine and health foods are now attracting much attention, for example, lactoferrin (LF): a multifunctional glycoprotein. As LF is non-toxic and low-cost, its application in healthcare and therapeutics is expected to be widespread. AREAS COVERED In this review, LF's general basic features are described. The interaction of LF with its receptors activates the immune system, including cytokine production and balance. In particular, the immune activation of orally administered LF is considered as a new strategy for the treatment of refractory diseases, such as inflammatory bowel disease, virus infection and tumor metastasis. Also mentioned are the problems associated with the use of LF. As LF is degraded rapidly in the body due to enzymatic hydrolysis, high amounts or frequent dosing is required; an appropriate delivery system may improve these problems and increase its efficiency. EXPERT OPINION Chemical modifications, such as PEGylation, can enhance the stability of LF in the body, resulting in increased efficacy. Also, liposomes and enteric or microparticulate formulations can promote the function of LF in oral administration due to target site delivery and protection of LF from enzymatic hydrolysis. These delivery systems are expected to improve the utility of LF.
Collapse
Affiliation(s)
- Hiraku Onishi
- Hoshi University, Department of Drug Delivery Research, Ebara, Shinagawa-ku, Tokyo, Japan.
| |
Collapse
|
22
|
Mrózek L, Dvořáková L, Mandelová Z, Rárová L, Řezáčová A, Plaček L, Opatřilová R, Dohnal J, Paleta O, Král V, Drašar P, Jampílek J. Investigation of new acyloxy derivatives of cholic acid and their esters as drug absorption modifiers. Steroids 2011; 76:1082-97. [PMID: 21557961 DOI: 10.1016/j.steroids.2011.04.014] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Revised: 04/12/2011] [Accepted: 04/21/2011] [Indexed: 11/20/2022]
Abstract
Skin penetration enhancers are used in the formulation of transdermal delivery systems for drugs that are otherwise not sufficiently skin-permeable. Intestinal absorption promoters/enhancers are used as excipients in oral formulations of poorly oral-bioavailable drugs. Series of fourteen acyloxy derivatives of 5β-cholic acid as potential drug absorption modifiers was generated by multistep synthesis. The synthesis of all newly prepared compounds is presented here. Structure confirmation of all generated compounds was accomplished by (1)H NMR, (13)C NMR, IR and MS spectroscopy methods. All the prepared compounds were analyzed using RP-TLC, and their lipophilicity (R(M)) was determined. The hydrophobicity (logP) and solubility (logS) of the studied compounds were also calculated using two commercially available programs. All the target compounds were tested for their in vitro transdermal penetration activity and as potential intestinal absorption enhancers. The anti-proliferative activity of all the final compounds was also assessed against the human cancer cell lines: T-lymphoblastic leukemia cell line and the breast adenocarcinoma cell line. Their cytotoxicity was also evaluated against the normal human skin fibroblast cells. Two compounds showed anti-proliferative effect on cancer cells without affecting the growth of normal cells, which should be promising in potential development of new drugs. Most of the target compounds showed minimal anti-proliferative activity (IC(50)>37 μM), indicating they would have low cytotoxicity when administered as chemical absorption modifiers. The relationships between the lipophilicity and the chemical structure of the studied compounds as well as the relationships between their chemical structure and enhancement effects are discussed in this article.
Collapse
Affiliation(s)
- Lech Mrózek
- BorsodChem MCHZ, s.r.o., Chemicka 1/2039, 709 03 Ostrava-Marianske Hory, Czech Republic
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Yassin AEB, Aodah AH, Al-Suwayeh S, Taha EI. Theophylline colon specific tablets for chronotherapeutic treatment of nocturnal asthma. Pharm Dev Technol 2011; 17:712-8. [PMID: 21486185 DOI: 10.3109/10837450.2011.572896] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The ultimate goal is to design a new chronotherapeutic system for theophylline (TPH) with high potential benefits in treating nocturnal asthma. TPH core tablets were prepared by wet granulation using a developed formula. Compression coating over core tablets containing 200 mg TPH was done using granulated chitosan with 10% PVP K30. Different formulae F1, F2 and F3 were prepared using coat weights 260, 300 and 360 mg, respectively. The in vitro release characteristics in both variant pH media mimicking the gastrointestinal media and in media containing rat cecal content were monitored. The in vivo performance of the optimum formula was compared with Avolen(®) SR in Beagle dogs. F3 with high coat thickness exhibited a minimal release after 5-h release study. Both F2 and F3 showed more than 50% drug release after 4 h in the rat cecal medium. This reflects the colon selectivity of the system. The C(max) values were found to be 5.49 ± 0.46 and 5.12 ± 0.85 μg/mL for F3 and Avolen(®) SR, respectively, F3 showed higher mean plasma concentration than Avolen(®) SR from the beginning and continued till 7 h post administration indicating high potential as chronotherapeutic treatment of nocturnal asthma.
Collapse
Affiliation(s)
- Alaa Eldeen B Yassin
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia.
| | | | | | | |
Collapse
|
24
|
Rabito MF, Reis AV, Freitas ADR, Tambourgi EB, Cavalcanti OA. A pH/enzyme-responsive polymer film consisting of Eudragit FS 30 D and arabinoxylane as a potential material formulation for colon-specific drug delivery system. Pharm Dev Technol 2011; 17:429-36. [PMID: 21222512 DOI: 10.3109/10837450.2010.546409] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Polymer film based on pH-dependent Eudragit FS 30 D acrylic polymer in association with arabinoxylane, a polysaccharide issued from gum psyllium, was produced by way of solvent casting. Physical-chemical characterization of the polymer film samples was performed by means of thermogravimetry (TGA), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). Furthermore, water-equilibrium swelling index (I(s)) and weight loss of the films in KCl buffer solution of pH 1.2, in KH(2)PO(4) buffer solution of pH 5.0, or in KH(2)PO(4) buffer solution of pH 5.0 consisting of 4% enzyme Pectinex 3X-L (w/v) were also carried out for the film characterization. No chemical interactions between the Eudragit FS 30 D and the arabinoxylane polymer chains were evidenced, thus suggesting that the film-forming polymer structure was obtained from a physical mixture of both polymers. The arabinoxylane-loader films showed a more pronounced weight loss after their immersion in buffer solution containing enzyme Pectinex 3X-L. The introduction of the arabinoxylane makes the film more susceptible to undergo an enzymatic degradation. This meant that the enzyme-dependent propriety issued from the arabinoxylane has been imprinted into the film formulation. This type of polymer film is an interesting system for applications in colon-specific drug delivery system.
Collapse
Affiliation(s)
- Mirela Fulgencio Rabito
- Laboratório de FarmacoTecnologia, Departamento de Farmacologia e Terapeutica Programa de Pós-graduação em Ciências Farmacêuticas, Maringá 87020-900, Brazil
| | | | | | | | | |
Collapse
|
25
|
Kumar SR, Piyush T, Suman R, Akanksha T. Preparation and Characterization of Cross-Linked Guar Gum Microspheres: Optimization Using Factorial Design. Chem Pharm Bull (Tokyo) 2011; 59:185-90. [DOI: 10.1248/cpb.59.185] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Shukla Raj Kumar
- School of Pharmaceutical Sciences, Rajiv Gandhi Technological University, The State Technical University of Madhya Pradesh
| | - Trivedi Piyush
- School of Pharmaceutical Sciences, Rajiv Gandhi Technological University, The State Technical University of Madhya Pradesh
| | - Ramteke Suman
- School of Pharmaceutical Sciences, Rajiv Gandhi Technological University, The State Technical University of Madhya Pradesh
| | - Tiwari Akanksha
- School of Pharmaceutical Sciences, Rajiv Gandhi Technological University, The State Technical University of Madhya Pradesh
| |
Collapse
|
26
|
Yassin AEB, Anwer MK, Mowafy HA, El-Bagory IM, Bayomi MA, Alsarra IA. Optimization of 5-flurouracil solid-lipid nanoparticles: a preliminary study to treat colon cancer. Int J Med Sci 2010; 7:398-408. [PMID: 21103076 PMCID: PMC2990076 DOI: 10.7150/ijms.7.398] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2010] [Accepted: 11/16/2010] [Indexed: 02/07/2023] Open
Abstract
Solid lipid nanoparticle (SLNs) formulae were utilized for the release of 5-flurouracil (5-FU) inside the colonic medium for local treatment of colon cancer. SLNs were prepared by double emulsion-solvent evaporation technique (w/o/w) using triglyceride esters, Dynasan™ 114 or Dynasan™ 118 along with soyalecithin as the lipid parts. Different formulation parameters; including type of Dynasan, soyalicithin:Dynasan ratio, drug:total lipid ratio, and polyvinyl alcohol (PVA) concentration were studied with respect to particle size and drug entrapment efficiency. Results showed that formula 8 (F8) with composition of 20% 5-FU, 27% Dynasan™ 114, and 53% soyalithicin andformula 14 (20% 5-FU, 27% Dynasan™ 118, and 53% soyalithicin), which were stabilized by 0.5% PVA, as well as F10 with similar composition as F8 but stabilized by 2% PVA were considered the optimum formulae as they combined small particle size and relatively high encapsulation efficiencies. F8 had a particle size of 402.5 nm ± 34.5 with a polydispersity value of 0.005 and an encapsulation efficiency of 51%, F10 had a 617.3 ± 54.3 nm particle size with 0.005 polydispersity value and 49.1% encapsulation efficiency, whereas formula F14 showed a particle size of 343 nm ± 29 with 0.005 polydispersity, and an encapsulation efficiency of 59.09%. DSC and FTIR results suggested the existence of the lipids in the solid crystalline state. Incomplete biphasic prolonged release profile of the drug from both formulae was observed in phosphate buffer pH 6.8 as well as simulated colonic medium containing rat caecal contents. A burst release with magnitudes of 26% and 28.8% cumulative drug released were noticed in the first hour samples incubated in phosphate buffer pH 6.8 for both F8 and F14, respectively, followed by a slow release profile reaching 50% and 52% after 48 hours.
Collapse
Affiliation(s)
- Alaa Eldeen B Yassin
- Department of Pharmaceutics, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia
| | | | | | | | | | | |
Collapse
|
27
|
Philip AK, Philip B. Colon targeted drug delivery systems: a review on primary and novel approaches. Oman Med J 2010; 25:79-87. [PMID: 22125706 PMCID: PMC3215502 DOI: 10.5001/omj.2010.24] [Citation(s) in RCA: 170] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2010] [Accepted: 03/14/2010] [Indexed: 11/03/2022] Open
Abstract
The colon is a site where both local and systemic delivery of drugs can take place. Local delivery allows topical treatment of inflammatory bowel disease. However, treatment can be made effective if the drugs can be targeted directly into the colon, thereby reducing the systemic side effects. This review, mainly compares the primary approaches for CDDS (Colon Specific Drug Delivery) namely prodrugs, pH and time dependent systems, and microbially triggered systems, which achieved limited success and had limitations as compared with newer CDDS namely pressure controlled colonic delivery capsules, CODESTM, and osmotic controlled drug delivery which are unique in terms of achieving in vivo site specificity, and feasibility of manufacturing process.
Collapse
Affiliation(s)
- Anil K. Philip
- Department of Pharmaceutics, School of Pharmacy, University of Nizwa, Birkat Al Mouz, Nizwa-616, Sultanate of Oman
| | - Betty Philip
- Department of Pharmaceutics, School of Pharmacy, University of Nizwa, Birkat Al Mouz, Nizwa-616, Sultanate of Oman
| |
Collapse
|
28
|
Talukder RM, Fassihi R. Development and in-vitro evaluation of a colon-specific controlled release drug delivery system. J Pharm Pharmacol 2010. [DOI: 10.1211/jpp.60.10.0005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Abstract
The major challenges in targeting drug to various parts of the gastrointestinal tract include control of drug release with respect to its environment and transit time. These two variables should be taken into consideration in designing a rational colonic drug delivery system. To this end, a swelling matrix core containing pectin, hydroxypropyl methylcellulose (HPMC), microcrystalline cellulose and 5-aminosalicylic acid was developed. This was subjected to a dual coating operation: an inner pH-sensitive enteric and an outer semi-permeable membrane coat with a pore former. In-vitro dissolution studies were carried out in USP apparatus-I using sequential pH media. The first 2 h of dissolution studies were done in HCl buffer at pH 1.5, the next 2 h in pH 5.5 and, finally, in phosphate buffer at pH 6.8 with and without pectinolytic enzyme present. Less than 2% drug was released in the first 6 h and about 90% released in the following 12 h in a controlled manner. The stability studies of the coated systems were performed for 90 days under various conditions and it was found that drug release was not adversely affected. Results indicate that this delivery system has potential for site-specific delivery of drugs to the colon irrespective of transit time and rapid changes in the proximal pH of the gastrointestinal tract.
Collapse
Affiliation(s)
- Rahmat M Talukder
- College of Pharmacy, Southwestern Oklahoma State University, Weatherford, OK 73096, USA
| | - Reza Fassihi
- Temple University School of Pharmacy, 3307 N. Broad St, Philadelphia, PA 19140, USA
| |
Collapse
|
29
|
Yassin AEB, Alsarra IA, Alanazi FK, Al-Mohizea AM, Al-Robayan AA, Al-Obeed OA. New targeted-colon delivery system:in vitroandin vivoevaluation using X-ray imaging. J Drug Target 2009; 18:59-66. [DOI: 10.3109/10611860903165022] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
30
|
Ravikumara NR, Madhusudhan B, Nagaraj TS, Hiremat SR, Raina G. Preparation and evaluation of nimesulide-loaded ethylcellulose and methylcellulose nanoparticles and microparticles for oral delivery. J Biomater Appl 2009; 24:47-64. [PMID: 19386664 DOI: 10.1177/0885328209103406] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The present study was designed to assess and compare with a range of surfactant-coated, nimesulide-free, and nimesulide-loaded ethylcellulose/methylcellulose (EC/MC) nanoparticles that were prepared by varying drug concentration (ED/MD), polymer concentration (EP/MP), and surfactant concentration (ES/MS). EC/MC nanoparticles prepared by desolvation method produced discrete particles and they were characterized by SEM, AFM, and FTIR studies. The particles mean size diameter (nm) ranged from 244 to 1056 nm and 1065 to 1710 nm for EC and MC nanoparticles, respectively. Studies on drug: polymer ratio showed a linear relationship between drug concentration and percentage of loading in nanoparticles. The encapsulation efficiency decreased with the increase of nimesulide concentration with respect to polymer concentration. Encapsulation efficiency of drug-loaded nanoparticles was varied between 32.8% and 64.9%. The in vitro release of drug-loaded nanoparticles was found to be a first order. This was significantly increased in EC nanoparticles (95.50%) in comparison with MC nanoparticles (95.12%) after 12 h in 24 h long study. Nimesulide release from EC nanoparticles was much slower at slightly alkaline pH 7.4. The in vitro hemolysis tests of nanoparticles were carried out to ascertain the hemocompatibility and shown to be insignificant for EC nanoparticles. In comparison, ES4 from EC formulations with nimesulide was found to be promising with slow and sustained drug release.
Collapse
Affiliation(s)
- N R Ravikumara
- Research Center for Nanoscience and Technology, Department of Biochemistry, P.G. Centre, Kuvempu University Shivagangotri, Davangere 577002, India
| | | | | | | | | |
Collapse
|
31
|
Sinha VR, Bhinge JR, Kumria R, Kumar M. Development of Pulsatile Systems for Targeted Drug Delivery of Celecoxib for Prophylaxis of Colorectal Cancer. Drug Deliv 2008; 13:221-5. [PMID: 16556575 DOI: 10.1080/10717540500309180] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
Abstract
The aim of the present study was to formulate fast release enteric-coated tablets for drug delivery to the colon. Two different approaches were used for the preparation of these tablets. The first included making use of superdisintegrant (SD) in the tablet. The amount of super disintegrant (cross-linked PVP) in the tablet and the coat weight were varied to formulate a suitable time-controlled release system, that would provide colon-specific drug delivery. The second approach consisted of development of osmogen-based tablets for drug delivery into the tracts of the colon. Two different osmogens, sodium chloride and potassium chloride, were used. These also were coated at different coat levels. Celecoxib was used as a model drug. In vitro drug release studies showed that superdisintegrants were more effective in showing burst effect in the tablets and therefore showed a rapid drug release as compared with osmogens, which would show a sustained drug release all through the colon. Osmotic tablets were formulated making use of a high concentration of osmogen sodium chloride (OM-SC) and potassium chloride (OM-KC) were further enteric-coated. These also were found to be useful in providing a sustained delivery of nearly 80-90% of the drug into the colonic region. The coat weight required in these tablets for protection in the upper gastrointestinal conditions varied from 9.69% in OM-KC tablets to 4.65% in OM-SC tablets.
Collapse
Affiliation(s)
- V R Sinha
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India.
| | | | | | | |
Collapse
|
32
|
Mundargi RC, Patil SA, Agnihotri SA, Aminabhavi TM. Development of Polysaccharide-Based Colon Targeted Drug Delivery Systems for the Treatment of Amoebiasis. Drug Dev Ind Pharm 2008; 33:255-64. [PMID: 17454058 DOI: 10.1080/03639040600897127] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The main focus of this study is to develop colon targeted drug delivery systems for metronidazole (MTZ). Tablets were prepared using various polysaccharides or indigenously developed graft copolymer of methacrylic acid with guar gum (GG) as a carrier. Various polysaccharides such as GG, xanthan gum, pectin, carrageenan, beta-cyclodextrin (CD) or methacrylic acid-g-guar (MAA-g-GG) gum have been selected and evaluated. The prepared tablets were tested in vitro for their suitability as colon-specific drug delivery systems. To further improve the colon specificity, some selected tablet formulations were enteric coated with Eudragit-L 100 to give protection in an acidic environment. Drug release studies were performed in simulated gastric fluid (SGF) for 2 hr followed by simulated intestinal fluid (SIF) at pH 7.4. The dissolution data demonstrate that the rate of drug release is dependent upon the nature and concentration of polysaccharide/polymer used in the formulations. Uncoated tablets containing xanthan gum or mixture of xanthan gum with graft copolymer showed 30-40% drug release during the initial 4-5 hr, whereas for tablets containing GG with the graft copolymer, it was 70%. After enteric coating, the release was drastically reduced to 18-24%. The other polysaccharides were unable to protect drug release under similar conditions. Preparations with xanthan gum as a matrix showed the time-dependent release behavior. Further, in vitro release was performed in the dissolution media with rat caecal contents. Results indicated an enhanced release when compared to formulations studied in dissolution media without rat caecal contents, because of microbial degradation or polymer solubilization. The nature of drug transport was found to be non-Fickian in case of uncoated formulations, whereas for the coated formulations, it was found to be super-Case-II. Statistical analyses of release data indicated that MTZ release is significantly affected by the nature of the polysaccharide used and enteric coating of the tablet. Differential scanning calorimetry indicated the presence of crystalline nature of drug in the formulations.
Collapse
Affiliation(s)
- Raghavendra C Mundargi
- Department of Chemistry, Center of Excellence in Polymer Science, Karnatak University, Dharwad, India
| | | | | | | |
Collapse
|
33
|
Yu DG, Zhu LM, Branford-White CJ, Yang XL. Three-Dimensional Printing in Pharmaceutics: Promises and Problems. J Pharm Sci 2008; 97:3666-90. [DOI: 10.1002/jps.21284] [Citation(s) in RCA: 123] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
34
|
|
35
|
Morgan M, Bulmer AC, Woodruff TM, Proctor LM, Williams HM, Stocks SZ, Pollitt S, Taylor SM, Shiels IA. Pharmacokinetics of a C5a receptor antagonist in the rat after different sites of enteral administration. Eur J Pharm Sci 2008; 33:390-8. [DOI: 10.1016/j.ejps.2008.01.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2006] [Revised: 01/18/2008] [Accepted: 01/19/2008] [Indexed: 11/28/2022]
|
36
|
Reis AV, Guilherme MR, Moia TA, Mattoso LHC, Muniz EC, Tambourgi EB. Synthesis and characterization of a starch-modified hydrogel as potential carrier for drug delivery system. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/pola.22588] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
|
37
|
Salvati A, Lynch I, Malmborg C, Topgaard D. Chemical shift imaging of molecular transport in colloidal systems: Visualization and quantification of diffusion processes. J Colloid Interface Sci 2007; 308:542-50. [PMID: 17182051 DOI: 10.1016/j.jcis.2006.11.035] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2006] [Revised: 11/06/2006] [Indexed: 11/29/2022]
Abstract
Magnetic resonance imaging with chemical shift resolution is demonstrated to provide detailed information about molecular transport on the macroscopic scale in complex colloidal systems. The concentrations of species with distinct 1H resonance lines can be quantified from spatially resolved, high-resolution, 1H nuclear magnetic resonance spectra. The method is demonstrated by experiments on three systems with multiple simultaneous transport processes where the diffusion coefficients depend on position and/or on the concentration of other species: (1) release of poly(ethylene glycol) and imidazole from a hydrogel into an external reservoir of water, (2) migration of acetic acid and tetramethylammonium ions in a highly concentrated water-in-oil emulsion with initially non-uniform concentration of solutes, and (3) release of tetramethylammonium ions loaded into a hydrogel triggered by the diffusion of methyl green into the gel matrix.
Collapse
Affiliation(s)
- Anna Salvati
- Physical Chemistry 1, Lund University, P.O.B. 124, SE-221 00 Lund, Sweden.
| | | | | | | |
Collapse
|
38
|
Chaurasia M, Chourasia MK, Jain NK, Jain A, Soni V, Gupta Y, Jain SK. Cross-linked guar gum microspheres: a viable approach for improved delivery of anticancer drugs for the treatment of colorectal cancer. AAPS PharmSciTech 2006; 7:74. [PMID: 17025254 PMCID: PMC2750516 DOI: 10.1208/pt070374] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
In the present work, guar gum microspheres containing methotrexate (MTX) were prepared and characterized for local release of drug in the colon, which is a prerequisite for the effective treatment of colorectal cancer. Guar gum microspheres were prepared by the emulsification method using glutaraldehyde as a cross-linking agent. Surface morphological characteristics were investigated using scanning electron microscopy. Particle size, shape, and surface morphology were significantly affected by guar gum concentration, glutaraldehyde concentration, emulsifier concentration (Span 80), stirring rate, stirring time, and operating temperature. MTX-loaded microspheres demonstrated high entrapment efficiency (75.7%). The in vitro drug release was investigated using a US Pharmacopeia paddle type (type II) dissolution rate test apparatus in different media (phosphate-buffered saline [PBS], gastrointestinal fluid of different pH, and rat cecal content release medium), which was found to be affected by a change to the guar gum concentration and glutaraldehyde concentration. The drug release in PBS (pH 7.4) and simulated gastric fluids followed a similar pattern and had a similar release rate, while a significant increase in percent cumulative drug release (91.0%) was observed in the medium containing rat cecal content. In in vivo studies, guar gum microspheres delivered most of their drug load (79.0%) to the colon, whereas plain drug suspensions could deliver only 23% of their total dose to the target site. Guar gum microspheres showed adequate potential in achieving local release of drug in in vitro release studies, and this finding was further endorsed with in vivo studies.
Collapse
Affiliation(s)
- Mohini Chaurasia
- Department of Pharmaceutical Sciences, Pharmaceutics Research Projects Laboratory, Sagar, MP India
| | | | - Nitin K. Jain
- Department of Pharmaceutical Sciences, Pharmaceutics Research Projects Laboratory, Sagar, MP India
| | - Aviral Jain
- Department of Pharmaceutical Sciences, Pharmaceutics Research Projects Laboratory, Sagar, MP India
| | - Vandana Soni
- Department of Pharmaceutical Sciences, Pharmaceutics Research Projects Laboratory, Sagar, MP India
| | - Yashwant Gupta
- Department of Pharmaceutical Sciences, Pharmaceutics Research Projects Laboratory, Sagar, MP India
| | - Sanjay K. Jain
- Department of Pharmaceutical Sciences, Pharmaceutics Research Projects Laboratory, Sagar, MP India
| |
Collapse
|
39
|
Bajpai SK, Dubey S, Saxena S. Flow Through Diffusion Cell Method: A Better Approach to Study Drug Release Behavior as Compared to Traditional Dissolution Test Method. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2006. [DOI: 10.1080/10601320600598795] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
40
|
Synthesis and characterization of pH-responsive hydrogels based on chemically modified Arabic gum polysaccharide. POLYMER 2006. [DOI: 10.1016/j.polymer.2006.01.058] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
41
|
McDowell A, McLeod BJ, Rades T, Tucker IG. Application of pharmaceutical drug delivery for biological control of the common brushtail possum in New Zealand: a review. WILDLIFE RESEARCH 2006. [DOI: 10.1071/wr06028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The common brushtail possum (Trichosurus vulpecula) is the most significant vertebrate pest in New Zealand, being a major ecological threat to the indigenous biodiversity and an economic threat as a vector for bovine tuberculosis. Novel and effective strategies to reduce the population of T. vulpecula are needed urgently. Several biocontrol agents are currently being assessed and from research to date it is likely that the biocontrol agents will be peptide or protein molecules. It is not possible to administer such biocontrol agents alone because they would be degraded rapidly in the animal, especially if delivered orally. Technologies used in the pharmaceutical industry to design efficacious drug-delivery systems for humans and animals can be applied to the design of delivery systems for biocontrol agents used in wildlife management, although there are some unique challenges that must be overcome.
Collapse
|
42
|
Bajpai SK, Saxena S. Flow through diffusion cell method: A novel approach to studyin vitro enzymatic degradation of a starch-based ternary semi-interpenetrating network for gastrointestinal drug delivery. J Appl Polym Sci 2006. [DOI: 10.1002/app.22897] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
43
|
Chan E, Zhang Z. Bioencapsulation by compression coating of probiotic bacteria for their protection in an acidic medium. Process Biochem 2005. [DOI: 10.1016/j.procbio.2005.03.001] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
44
|
Klotz U. Colonic targeting of aminosalicylates for the treatment of ulcerative colitis. Dig Liver Dis 2005; 37:381-8. [PMID: 15893274 DOI: 10.1016/j.dld.2004.12.011] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2004] [Accepted: 12/16/2004] [Indexed: 12/11/2022]
Abstract
Aminosalicylates (5-aminosalicylic acid) represent drugs of first choice in the treatment of ulcerative colitis. Two different therapeutic approaches have been employed to target the active 5-aminosalicylic acid to its site of action. Either inactive azo-prodrugs (e.g. sulfasalazine, olsalazine, balsalazide) or special galenic formulations have been developed for topical delivery of 5-aminosalicylic acid to the colon. However, as intestinal physiology, the extent of ulcerative colitis as well as drug disposition demonstrate large interindividual differences, acute healing rates (40-80%) and the maintenance of remission are quite variable. Apparently, therapeutic effects depend on local concentrations of 5-aminosalicylic acid in the colonic mucosa whereas systemic drug exposure might be one determinant of side effects. In general, 5-aminosalicylic acid is well tolerated and withdrawal from therapy is rare. Following administration of azo-prodrugs (e.g. olsalazine), lower plasma concentrations and higher delivery into the colon of 5-aminosalicylic acid can be observed in comparison to special galenic formulations of 5-aminosalicylic acid. Whether such changes in drug disposition will affect therapeutic efficacy remains to be proved by clinical data. Consequently, selection of a particular agent should be based primarily on clinical efficacy, profile of adverse effects, patients' acceptance and economic considerations.
Collapse
Affiliation(s)
- U Klotz
- Dr. Margarete Fischer-Bosch-Institute of Clinical Pharmacology, Auerbachstrasse 112, D-70376 Stuttgart, Germany.
| |
Collapse
|
45
|
Abstract
Various attempts have been made to develop gastroretentive delivery systems. For example, floating, swelling, mucoadhesive, and high-density systems have been developed to increase gastric retention time of the dosage forms. It is known that differences in gastric physiology, such as, gastric pH, and motility exhibit both intra- as well as inter-subject variability demonstrating significant impact on gastric retention time and drug delivery behavior. Nevertheless, some floating devices have shown promising results. In this paper, the gastric physiology and the reported intragastric delivery systems have briefly been presented.
Collapse
Affiliation(s)
- R Talukder
- Temple University School of Pharmacy, Philadelphia, PA 19140, USA
| | | |
Collapse
|
46
|
Mehuys E, Remon JP, Vervaet C. Production of enteric capsules by means of hot-melt extrusion. Eur J Pharm Sci 2005; 24:207-12. [PMID: 15661492 DOI: 10.1016/j.ejps.2004.10.011] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2003] [Revised: 10/05/2004] [Accepted: 10/20/2004] [Indexed: 10/26/2022]
Abstract
The aim of this study was to develop an alternative technique for enteric coating consisting of the hot-melt extrusion of coating polymers. An enteric coating polymer (PVAP or HPMC AS), premixed with a plasticizer, was extruded into hollow cylinders. The hollow pipes were filled with a model drug and both open ends of the cylinders were closed, yielding hot-melt extruded enteric capsules. Main advantages of this new technology are the continuity of the process and its application for the formulation of moisture sensitive active ingredients. The enteric capsules showed excellent gastro-resistance, since no drug release was observed after 2 h 0.1N HCl. The influence of wall thickness (0.15, 0.3, 0.5, 0.8, and 1.0 mm) of the capsules on drug release was investigated. Enteric capsules with a wall thickness of 1.0 mm were subjected to a pH gradient dissolution method, simulating passage through the gastro-intestinal tract, in order to evaluate their suitability for ileal or colonic drug targeting. Storing the capsules for 1 month at high relative humidity (RH) (60 and 75% RH) revealed that the HPMC AS capsules were superior to the PVAP capsules. It can be concluded that hot-melt extruded capsules seem suitable as an alternative for enteric coating.
Collapse
Affiliation(s)
- Els Mehuys
- Laboratory of Pharmaceutical Technology, Ghent University, Harelbekestraat 72, 9000 Gent, Belgium
| | | | | |
Collapse
|
47
|
Friend DR. New oral delivery systems for treatment of inflammatory bowel disease. Adv Drug Deliv Rev 2005; 57:247-65. [PMID: 15555741 DOI: 10.1016/j.addr.2004.08.011] [Citation(s) in RCA: 216] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2004] [Accepted: 08/11/2004] [Indexed: 02/08/2023]
Abstract
Inflammatory bowel disease (IBD) is often localized to specific sites in the gastrointestinal tract (GIT). As a result, this disease can be treated with oral site-specific (targeted) drug delivery systems. Targeted delivery systems for treatment of IBD are designed to increase local tissue concentrations of antiinflammatory drugs from lower doses compared with systemic administration. This review addresses the impact disease has or may have on oral targeted delivery for treatment of IBD as well as a number of delivery approaches currently used in marketed products or under investigation. Delivery systems reviewed rely on temporal control, changes in pH along the GIT, the action of local enzymes to trigger drug release, and changes in intraluminal pressure. Dissolution of enteric polymer coatings due to a change in local pH and reduction of azo-bonds to release an active agent are both used in commercially marketed products. Newer approaches showing promise in treating IBD are based on polysaccharides. These materials are most effective when used as compression coatings around core tablets, which contain the active agent. More complex polymeric prodrugs systems are also under investigation. If the dose of the drug is sufficiently low, this approach may also prove useful in improving treatment of IBD.
Collapse
Affiliation(s)
- David R Friend
- MicroDose Technologies, Inc., Monmouth Junction, NJ 08852, USA.
| |
Collapse
|
48
|
Klotz U, Schwab M. Topical delivery of therapeutic agents in the treatment of inflammatory bowel disease. Adv Drug Deliv Rev 2005; 57:267-79. [PMID: 15555742 DOI: 10.1016/j.addr.2004.08.007] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2004] [Accepted: 08/11/2004] [Indexed: 01/18/2023]
Abstract
For targeting local and systemic inflammatory processes in inflammatory bowel disease (IBD) therapeutic agents of first choice (e.g. aminosalicylates, corticosteroids) have been developed in special galenic forms to accomplish the topical delivery of the active compounds to the terminal ileum (Crohn's disease) and/or the colon (Crohn's disease and ulcerative colitis). However, it has to be realized that intestinal physiology (e.g. motility, intraluminal pH profiles), extent and pattern of IBD as well as drug disposition demonstrate large interindividual differences resulting in variable clinical response rates between about 35% and 75%. 5-Aminosalicylate (5-AS) can be delivered to the colon either by azo-prodrugs (e.g. sulfasalazine, olsalazine or balsalazide) or by direct rectal administration of 5-AS in form of enemas, foam or suppositories. Such formulations will be only effective in patients with ulcerative colitis (UC). Various slow/controlled release preparations of 5-AS have been developed for oral use. Some of them (e.g. Pentasa, Salofalk) release sufficient 5-AS already in the small bowel which could provide some additional benefit in Crohn's disease (CD). As urinary and faecal recoveries of total 5-AS are similar for all oral formulations, no major clinical differences can be expected. Extent of the disease, profile of adverse effects and patient's acceptance provide some guidance for selection of the particular agent. Rectal installation of several glucocorticosteroids has been employed for many years. More recently scientific and clinical interest has been focused on budesonide which is extensively presystemically metabolized in the intestinal wall and the liver. Therefore, its systemic availability is low (10-15%) independent whether budesonide is administered orally as controlled release formulation in patients with CD or rectally as enema in patients with UC. Numerous pharmacokinetic and clinical studies have documented the anticipated topical delivery and clinical efficacy of this corticosteroid without serious side effects such as cushingoid features. It can be assumed that for any novel therapeutic principle in IBD the approach of topical delivery will be also tried.
Collapse
Affiliation(s)
- Ulrich Klotz
- Dr. Margarete Fischer-Bosch-Institute of Clinical Pharmacology, Auerbachstrasse 112, D-70376 Stuttgart, Germany.
| | | |
Collapse
|
49
|
Bajpai SK, Saxena S, Dubey S. The flow-through diffusion cell (FTDC) method: a novel approach toin vitro drug release studies. POLYM INT 2005. [DOI: 10.1002/pi.1954] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
50
|
Gümüşderelioğlu M, Kesgin D. Release kinetics of bovine serum albumin from pH-sensitive poly(vinyl ether) based hydrogels. Int J Pharm 2004; 288:273-9. [PMID: 15620867 DOI: 10.1016/j.ijpharm.2004.10.013] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2004] [Revised: 09/04/2004] [Accepted: 10/11/2004] [Indexed: 11/26/2022]
Abstract
pH-Sensitive amphiphilic hydrogels were synthesized by radiation copolymerization of ethylene glycol vinyl ether (EGVE), butyl vinyl ether (BVE) and acrylic acid (AA) in the presence of crosslinking agent, diethylene glycol divinyl ether (DEGDVE). The results of the swelling experiments indicated that the hydrogel which has 60:40:5 comonomer ratio (mol% of EGVE:BVE:AA in monomeric mixture) is pH-sensitive. While the hydrogel is in a fully hydrated form at pH>6, it extensively dehydrates below pH 6. A two-stage volume phase transition was observed in the range of pH 6.0-7.0 and 7.5-8.0. In addition, the equilibrium water contents of the gels decreased with increasing temperature from 4 to 37 degrees C by following the non-Fickian diffusion mechanism. The utility of pH-sensitive gels in delivery of protein based drugs was investigated. Bovine serum albumin (BSA) loaded gels were prepared and protein release was examined by fluorescence spectroscopy in the range of pH 2-9. While the protein release was very low at pH 2, readily high amount of BSA were released at pH>6. It was concluded that the pH-sensitive EGVE-BVE-AA terpolymers may be suitable for the oral administration of protein based drugs as a carrier through gastrointestinal (GI) tract.
Collapse
|