• Title/Summary/Keyword: drug release

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Development of specific organ-targeting drug delivery system 1

  • Kim, Chong-Kook;Jeong, Eun-Ju;Yang, Ji-Sun;Kim, Seung-Hwan;Kim, Yang-Bae
    • Archives of Pharmacal Research
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    • v.8 no.3
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    • pp.159-168
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    • 1985
  • In attempt to develop a drug delivery system using serum albumin microspheres, bovine serum albumin microspheres containing antitumor agent, cytarabine, were prepared. The shape, surface characteristics, size distribution, behavior of in vitro distribution, drug release behaior, and degradation of albumin microspheres in animal liver tissue homogenate and proteolytic enzyme were investigated. The shape of albumin microspheres was spherical and the surface was smooth and compact. The size distribution of the albumin microspheres was affected by dispersion forces during emulsification and albumin concentration. Distribution of albumin mirospheres after intravenous administration in rabbit was achieved immediately. In vitro, albumin microsphere matrix was so hard that it retained most of cytarabine except initial burst during the first 10 minutes, and the level of drug release during the initial burst was affected by heating temperature, drug/albumin concentration ratio and size distribution. After drug release test, the morphology of albumin micropheres was not changed. Albumin microsphere matrix was degraded by the rabbit liver tissue homogenate and proteolytic enzyme. The degree of degradation was affected by heating temperature.

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Mucoadhesion, Swelling and Drug Release Characteristics of Hydroxypropylcellulose/Carbopol Solid Dispersions (히드록시프로필셀룰로오스/카르보폴 고체분산체의 점막부착성과 팽윤 및 약물방출특성)

  • Kim, Sang-Heon;Yang, Su-Geun;Shin, Dong-Sun;Lee, Min-Suk;Choi, Young-Wook
    • Journal of Pharmaceutical Investigation
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    • v.24 no.3
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    • pp.155-165
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    • 1994
  • Some mucoadhesive polymers such as hydroxypropylcelluose (HPC) and carbopol-934 (CP) have been employed for the preparation of mucoadhesive polymeric systems, and their physical properties including mucoadhesion, swelling, and drug release were evaluated. A new simple experimental technique that can quantitatively measure the bioadhesive properties of various polymeric systems has been developed by the methods of detachment force test. As the polymeric systems, the discs of freeze-dried HPC/CP solid dispersions were prepared. The mucosa used in these tests were upper, middle, and lower parts of small intestine of male rats weighing $300{\sim}350\;g$. Detachment forces were increased as the mole fraction of CP increased in discs of HPC/CP solid dispersions. In the points of intestinal site dependence of mucoadhesion, the solid dispersions revealed non-specific mucoadhesion to the intestine. Swelling and drug release characteristics of mucoadhesive polymeric systems were studied extensively to find out the feasibility for the oral controlled delivery systems. Swelling ratio, expressed as the final height/initial height, has been determined in various pH buffer solutions. Hydrochlorothiazide (HCT) was employed as a model drug for release study. Apparent swelling and drug release rate constants, $K_s$ and $K_r$ respectively, were obtained from the square-root time plot of either swelling ratio or released amount of drug, particularly for the time periods before reaching the equilibrium. As a result, the swelling ratio of HPC/CP solid dispersions was increased as the weight percentage of CP increased. Similarly, the release of HCT from the solid dispersions was dependent on pH changes and CP contents, resulted in the slower release of HCT with the increases of pH and CP contents.

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A Study on the Control of Pseudoephedrine Hydrochloride Release from Hydroxypropylmethylcellulose Matrices (Hydroxypropylmethylcellulose로부터 염산슈도에페드린의 방출조절에 관한 연구)

  • Cho, Hoon;Bang, Moon-Soo;Chung, Yongseog
    • Applied Chemistry for Engineering
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    • v.10 no.2
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    • pp.201-205
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    • 1999
  • Hydroxypropylmethylcelluloses (HPMC) are cellulose ethers which may be used as the basis for hydrophilic matrices for controlled release oral delivery and offer the advantages of being non-toxic and relatively inexpensive. In this work, we designed new drug release system using HPMC as matrix, manufactured by direct compression technology and have investigated the effects of the controlling factors on drug release from a swellable hydrophillic delivery system. It was found that the release rate of the drug decreased with increasing the polymer molecular weight and the polymer content in tablets, and was independent of compaction pressure and pH of dissolution fluids. Especially, the ability of the anionic surfactant, sodium laurylsulfate, to retard the release of pseudoephedrine hydrochloride from HPMC was characterised. With increasing the concentration of the sodium laurylsulfate within the matrix, drug release rate decreased. It is believed that, provided the pseudoephedrine hydrochloride and the sodium laurylsulfate are oppositely charged, they will bind together in situ within the HPMC matrix, leading to reduced drug release rates.

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Application of Stimuli-responsive Chitosan Micelles for Improved Therapeutic Efficiency of Anticancer Agents (항암제의 치료 효율성을 높이기 위한 다양한 자극 응답성 물질이 개질된 키토산 마이셀의 응용성 고찰)

  • Jeong, Gyeong-Won;Park, Jun-Kyu;Nah, Jae-Woon
    • Applied Chemistry for Engineering
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    • v.29 no.2
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    • pp.147-154
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    • 2018
  • Currently, to overcome low therapeutic efficiencies and side effects of anticancer agents, the study of drug carrier based on polymers have been consistently investigated. Although the traditional drug carrier based on polymers displayed an excellent result and significant progress, there has been a problem with the side effect and low therapeutic efficiency because of the premature drug release before reached to the targeted region by the low stability in blood stream and sustained drug release. In this review article, to improve the problem of inefficient drug release, methods were suggested, which can maximize the therapeutic efficiency by increasing the stability in the blood stream and triggering drug release at the target site by introducing a stimuli-responsive substance to the non-toxic and biocompatible natural polymer chitosan.

Control of Drug Release from Polymeric Matrices Coated with Poly(DL-lactide) I. Effect of Coasting Substance on the Drug Release in pH 1.2 Hydrochloride Solution (Poly(DL-lactide)로 피막된 고분자 매트릭스로부터 약물 방출 조절 I. pH 1.2 염산 용액에서 피막물질이 약물방출에 미치는 영향)

  • 나재운;박영훈
    • KSBB Journal
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    • v.14 no.3
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    • pp.297-302
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    • 1999
  • The polymeric matrices coated with poly(DL-lactide) were prepared using chitosan derivatives such as chitosan, chitosan hydrochloride, and sulfonated chitosan for application of drug delivery systems. The drug release study using prednisolone as a model drug was performed in the hydrochloride solution at pH 1.2. The release rate of drug was decreased according to the increased content of matrices. The release rate of prednisolone according to the kinds of polymeric matrices coated were decreased in the order to chitosan, sulfonated chitosan, and chitosan hydrochloride. Drug release rate of polymeric matrices coated with poly(DL-lactide) was not only two times slower than noncoated one, but also the burst effect of initial period of drug release was decreased in comparison with noncoated one. From these results, it was expected that these formulations based on the chitosan derivative matrices coasted with poly(DL-lactide) were acceptable drug delivery devices for a sustained-release dosage form of drug.

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Pharmaceutical Formulation and Evaluation of Sustained - Release Hydrophilic Matrix Tablet of Cefatrizine Propyleneglycol Using Polyethylene Oxide (폴리에틸렌옥사이드를 이용한 세파트리진프로필렌글리콜 서방성매트릭스 정제의 제조 및 평가)

  • Lee, Eon-Hyoung;Park, Sun-Young;Jee, Ung-Kil;Kim, Dong-Chool
    • Journal of Pharmaceutical Investigation
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    • v.31 no.1
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    • pp.37-41
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    • 2001
  • Various characteristics of polyethylene oxide (PEO) are useful for drug delivery systems. In this study, PEO was used as a sustained release matrix system containing cefatrizine propyleneglycol (Cefa-PG) which is a new semi-synthetic broad-spectrum and orally active cephalosporin. Five kinds of sustained release matrix tablets were formulated with various content of PEO and other ingredients. And three types of matrix tablets were formulated of which compositions were the same but the hardness was different. It was found that PEO content influenced drug release rate. Increasing PEO content, the drug release rate from matrix tablets was decreased. In addition, Avicel, one of the ingredients of matrix components, changed the drug release from the sustained release PEO matrix tablets. With increasing Avicel content, the rate of drug release was increased. For the effect of hardness of matrix tablets, the rate of drug release is decreased with increasing hardness. In comparison of bioavailability parameters after oral administration of Cefa-PG PEO matrix tablets and general Cefa-PG capsule in beagle dog, the sustained release PEO matrix tablets is more useful than a general dosage form. $AUC^{0-12}$ of the sustained release PEO matrix tablet and the general dosage form was 1.16 and 0.644 respectively.

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Drug Release and Skin Irritancy of Poloxamer Gel Containing Kojic Acid (코지산을 함유한 폴록사머 겔 제제의 약물방출 및 피부자극성)

  • Park, Eun-Woo;Cho, Seong-Wan;Kim, Dong-Sup;Choi, Ki-Hwan;Choi, Young-Wook
    • Journal of Pharmaceutical Investigation
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    • v.28 no.3
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    • pp.177-183
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    • 1998
  • Low toxicity, reverse thermal gelation and high drug loading capabilities suggest that poloxamer 407 gels have great potential as a topical drug delivery system. Kojic acid (KA) is an antimelanogenic agent which has been widely used in cosmetics to whiten the skin color. However, it has the drawbacks of skin irritancy due to its acidic pH. Poloxamer gels of different polymer contents were formulated to overcome the problem and compared to the cream type formulations of either w/o/w multiple emulsion cream or o/w type emulsion cream. Using Franz diffusion cells mounted with a synthetic cellulose membrane (MWCO 12,000), drug release characteristics of the formulations were evaluated by the HPLC assay of KA concentration in the receptor compartment of pH 7.4 phosphate buffered saline solutions. Drug release from w/o/w multiple emulsion cream was controlled by oil membrane, showing the apparent zero order release kinetics. The KA release from the poloxamer gels was also controlled by the gel matrix, showing that drug release increased linearly as KA contents increase, but decreased exponentially as the polymer contents increase. In the skin irritancy test, the primary irritancy index(PII) of poloxamer gel base was lower than those of multiple emulsion cream base and o/w cream. Depending on KA contents or polymer contents in the gel. PH values in poloxamer gels were ranged from 1.3 to 2.0, which are interpreted as low or negligible irritation on skin. There was a good correlation between the log value of flux in drug release and PII value in skin irritation. It was possible to conclude that the poloxamer gels containing KA might be a good candidate for an antimelanogenic topical delivery system by virtue of the controlled release of the drug and the reduced skin irritancy.

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Poly(L-lysine) Based Semi-interpenetrating Polymer Network as pH-responsive Hydrogel for Controlled Release of a Model Protein Drug Streptokinase

  • Park, Yoon-Jeong;Jin Chang;Chen, Pen-Chung;Victor Chi-Min Yang
    • Biotechnology and Bioprocess Engineering:BBE
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    • v.6 no.5
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    • pp.326-331
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    • 2001
  • With the aim of developing of pH-sensitive controlled drug release system, a poly(Llysine) (PLL) based cationic semi-interpenetrating polymer network (semi-IPN) has been synthesized. This cationic hydrogel was designed to swell at lower pH and de-swell at higher pH and therefore be applicable for achieving regulated drug release at a specific pH range. In addition to the pH sensitivity, this hydrogel was anticipated to interact with an ionic drug, providing another means to regulate the release rate of ionic drugs. This semi-IPN hydrogel was prepared using a free-radical polymerization method and by crosslinking of the polyethylene glycol (PEG)-methacrylate polymer through the PLL network. The two polymers were penetrated with each other via interpolymer complexation to yield the semi-IPN structures. The PLL hydrogel thus prepared showed dynamic swelling/de-swelling behavior in response to pH change, and such a behavior was influenced by both the concentrations of PLL and PEG-methacrylate. Drug release from this semi-IPN hydrogel was also investigated using a model protein drug, streptokinase. Streptokinase release was found to be dependent on its ionic interaction with the PLL backbones as well as on the swelling of the semi-IPN hydrogel. These results suggest that a PLL semi-IPN hydrogel could potentially be used as a drug delivery platform to modulate drug release by pH-sensitivity and ionic interaction.

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Release Properties of BSA from Pectin Heads for Colonic Drug Delivery (Colonic Delivery를 위한 펙틴 비드로부터 BSA의 방출 특성)

  • 최춘순;박상무;송원현;이창문;이기영;김동운;김진철
    • KSBB Journal
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    • v.18 no.2
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    • pp.161-164
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    • 2003
  • Oral drug delivery system using pectin gel was developed for colon-targeting of peptide drug. BSA(bovine serum albumin)-loaded pectin and pectin-alginate beads were prepared for drug release properties in vitro. Morphological studies by electron microscopy indicated that pectin and pectin-alginate beads were spherical in shape and approximately 1.0 mm. In order to find the suitable beads, effects of cross-linking agents (calcium chloride or zinc acetate) and drying temperature of beads were investigated. Drug release decreased with concentration of cross-linking agents and drying temperature. For colonic drug delivery from pectin and pectin-alginate beads, pectin degradable enzymes were added at 5 hrs from the beginning of drug release. After addition of enzymes, drug release was suddenly increased against free enzymes. Therefore, pectin and pectin-alginate beads can be promised as useful drug release carriers for colon-targeted delivery.

Poly(ε-caprolactone) Microcapsule with Encapsulated Nifedipine Prepared by Magnetic Stirrer

  • Lee, Hyeran;Lee, Deuk Yong;Song, Yo-Seung;Kim, Bae-Yeon
    • Journal of Biomedical Engineering Research
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    • v.40 no.1
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    • pp.7-14
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    • 2019
  • The microencapsulation of nifedipine (NF) with 4 wt% of poly(${\varepsilon}-caprolactone$) (PCL)/polyvinylpyrollidone (PVP) or PCL/polyethylene glycol (PEG) was carried out by solvent evaporation method in oil in water emulsion system to investigate the effect of PVP and PEG addition on drug release behavior of the microcapsules. The PVA (emulsifier) concentration of 1.0 wt% was chosen for the formation of PCL capsule having an average size of $154{\pm}25{\mu}m$ due to nearly spherical shape with a narrow size distribution. As PCL/PVP and PCL/PEG ratios were raised from 10/0 to 6/4, the capsule size increased gradually from $154{\pm}25{\mu}m$ to $236{\pm}32{\mu}m$ and $248{\pm}56{\mu}m$, respectively. The drug release rate of PCL/PVP and PCL/PEG capsules increased dramatically from 0 to 4 h at the beginning and then reached the plateau region from 20 h. As the concentration of PVP or PEG increased, the amount of drug release increased, suggesting that the larger capsule size was attributed to the higher drug content. However, the drug release behavior remained almost constant. The PCL capsules exhibited no evidence of causing cell lysis or toxicity regardless of NF loading, implying that the microcapsules are clinically suitable for use as drug delivery systems.