Colon Specific Delivery
Mostrando 1-12 de 21 artigos, teses e dissertações.
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1. Solid dispersion-based pellet for colon delivery of tacrolimus through time- and pH-dependent layer coating: preparation, in vitro and in vivo studies
The intent of the present investigation is to develop and evaluate colon-specific coated tacrolimus solid dispersion pellet (SDP) that retards drug release in the stomach and small intestine but progressively releases in the colon. Tacrolimus-SDP was prepared by extrusion-spheronization technology and optimized by the micromeritic properties including flowab
Braz. J. Pharm. Sci.. Publicado em: 24/10/2019
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2. Design and evaluation of rhubarb total free anthraquinones oral colon-specific drug delivery granules to improve the purgative effect
Rhubarb is commonly used as a cathartic in Asian countries. However, researchers have devotedextensive concerns to the quality control and safety of rhubarb and traditional Chinese preparations composed of rhubarb due to the instable purgative effect and potential nephrotoxicity of anthraquinones. In this study, we aimed to prepare rhubarb total free anthraq
Braz. J. Pharm. Sci.. Publicado em: 10/07/2019
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3. Formulation development and evaluation of colon targeted delayed release methotrexate pellets for the treatment of colonic carcinoma
Colonic carcinoma is one of the most common internal malignancies and is the second leading cause of deaths in United States. Methotrexate (MTX) is a drug of choice in the treatment of colon cancer. The aim of the present research work was to develop and characterize colon targeted pellets of MTX for treatment of colonic carcinoma. The product and process pa
Braz. J. Pharm. Sci.. Publicado em: 08/04/2019
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4. A suppository-base-matrix tablet for time-dependent colon-specific delivery system
Nossa pesquisa focou-se nas principais características de planejamento e de desempenho de liberação cólon-específica tempo-dependente (TDCS) de comprimidos, que leva em conta a constância relativa observada no tempo de trânsito intestinal das formas de dosagem. A doença inflamatória do intestino (IBD) pode afetar o tempo de trânsito e, geralmente,
Braz. J. Pharm. Sci.. Publicado em: 2014-09
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5. Novos sistemas de liberação de fármacos à base de xilana
O presente trabalho teve como objetivo a extração e caracterização do polímero de xilana a partir de resíduos de sabugo de milho e a produção de microcápsulas a partir deste polímero. O primeiro passo foi a extração da xilana em meio alcalino e caracterização deste polímero quanto as suas propriedades tecnológicas (ângulo de repouso, fator d
Publicado em: 2010
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6. Desenvolvimento de uma formulação cólon específica visando o tratamento da colite ulcerativa
Micro and nanoparticulate systems as drug delivery carriers have achieved successful therapeutic use by enhancing efficacy and reducing toxicity of potent drugs. The improvement of pharmaceutical grade polymers has allowed the development of such therapeutic systems. Microencapsulation is a process in which very thin coatings of inert natural or synthetic po
Publicado em: 2009
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7. Micropartículas poliméricas à base de xilana e Eudragit S-100 contendo mesalazina visando à liberação cólon-específica
Colon-specific drug delivery systems have attracted increasing attention from the pharmaceutical industry due to their ability of treating intestinal bowel diseases (IBD), which represent a public health problem in several countries. In spite of being considered a quite effective molecule for the treatment of IBD, mesalazine (5-ASA) is rapidly absorbed in th
Publicado em: 2009
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8. Chitosan–Chondroitin Sulfate Based Matrix Tablets for Colon Specific Delivery of Indomethacin
The different approaches for targeting orally administered drugs to the colon include coating with pH-dependent polymers, design of time-release dosage forms, and the utilization of carriers that are degraded exclusively by colonic bacteria. The aim of the present study was to develop a single unit, site-specific drug formulation allowing targeted drug relea
Springer US.
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9. Colon Specific Delivery of Indomethacin: Effect of Incorporating pH Sensitive Polymers in Xanthan Gum Matrix Bases
In the present study, an attempt has been made to design controlled release colon-specific formulations of indomethacin by employing pH responsive polymers Eudragit (L100 or S100) in matrix bases comprised of xanthan gum. The prepared tablets were found to be of acceptable quality with low-weight variation and uniform drug content. In vitro release studies i
Springer US.
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10. Design and development of hydrogel beads for targeted drug delivery to the colon
The purpose of this research was to develop and evaluate a multiparticulate system of chitosan hydrogel beads exploiting pH-sensitive property and specific biodegradability for colon-targeted delivery of satranidazole. Chitosan hydrogel beads were prepared by the cross-linking method followed by enteric coating with Eudragit S100. All formulations were evalu
Springer-Verlag.
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11. In vitro evaluation of dissolution behavior for a colon-specific drug delivery system (CODES™) in multi-pH media using United States Pharmacopeia apparatus II and III
United States Pharmacopeia dissolution apparatus II (paddle) and III (reciprocating cylinder) coupled with automatic sampling devices and software were used to develop a testing procedure for acquiring release profiles of colon-specific drug delivery system (CODES™) drug formulations in multi-pH media using acetaminophen (APAP) as a model drug. System suit
Springer-Verlag.
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12. Induction of specific immunoglobulin A in the small intestine, colon-rectum, and vagina measured by a new method for collection of secretions from local mucosal surfaces.
In order study patterns of local antibody responses following mucosal immunization of mice via different routes, a method for collection of secretions directly from mucosal surfaces was developed. Mice were immunized on days 0, 10, 17, and 24 by administration of cholera toxin into the oral cavity, stomach, colon-rectum, or vagina. At sacrifice on day 32, ab