• 분석과학
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• 제20권2호
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• pp.176-182
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• 2007

본 연구는 매트릭스형의 농약 활성물질을 포함하는 서방성 수분 인지제제 및 그의 제조방법에 관한 것이다. 산을 첨가한 커들란 용액에 망목구조를 가진 매트릭스가 형성되며 이 매트릭스에 열처리를 하게 되면 수용성이 없어진다. 본 매트릭스의 망목구조는 수분이 존재조건에서 열리며 건조조건에서는 다시 닫히게 된다. 그러므로 본 서방성 제형시스템에서는 수분이 있는 조건에서만 농약 활성물질이 제형에서 방출된다. 본 서방성 제제에 따른 구성을 이용하면 농약 활성물질의 효과 발현시기를 제어할 수 있고, 약해(藥害) 등의 발생을 경감시킬 수 있다.

• 한국동물위생학회지
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• 제33권2호
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• pp.173-176
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• 2010

Here, we report the suitability of using a resin-type chitosan formulae as a sustained-releasing form adjuvant in comparison with commercially well-known Freund's adjuvants. To induce the immunological responses, N-terminal region of Pasteurella multocida toxin was used as an antigen, which was found to be protective immunogen against P. multocida infection. Mice immunized with chitosan resin formulae showed statistically significant antibody induction (P<0.001) as much as that of Freund’s adjuvants. As a result, the resin-type sustained-releasing form chitosan formulae is thought to be a good candidate for a new type adjuvant.

• 한국환경농학회지
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• 제11권2호
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• pp.155-162
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• 1992

수용해도가 2.53ppm인 KC-6620을 수중용출기간이 20일 정도인 입제로 제제하기 위하여 원제에 대한 용출지연효과가 가장 큰 다공성 증량제를 선발하고, PEG를 부제로 첨가한 흡착식 입제를 제제하여 실내에서 수중용출속도를 측정하였다. 1. 다공성 증량제중 KC-6620에 대하여 용출지연효과를 나타낸 것은 bentonite 소결공립이었으나 수중에 침적 20일후의 용출율이 매우 낮았다. 2. Bentonite에 pyrophyllite를 혼합하고 조립한 다음 소결시킴으로써 흡유가가 증가하였으며, 이 공립으로 제제한 KC-6620 입제의 수중용출속도도 증가하였다 BP60 입제의 경우 침적 20일후에 85% 이상의 용출율을 보여 시험한 입제중 단기용출지연제제로 가장 적합하였다. 3. BP입제는 PEG를 부제로 첨가하여 용출속도를 증가시킬 수 있었으며, PEG의 첨가비가 공립의 흡유가까지 증가할수록 용출속도도 증가하였다. 4. BP40 입제는 입제중의 유효성분함량이 높을수록 수중용출속도가 느려져서 제제농도가 용출속도를 좌우하는 가장 큰 요인이었다.

• 한국임상수의학회지
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• 제9권1호
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• pp.333-366
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• 1992

Safety of recombinant porcine somatotropin administration on pig was studied using 32 Landrace x Yorkshire crossbred pigs. The starting body weight ranged from 55.5kg to 65.3kg. Eight pigs were allotted to each low dose group of sustained releasing rPST(SL), high dose group of sustained releasing rPST(SH), daily injection group of rPST(DI), and control group(C). Pigs in SL group and SH group were injected subcutaneously twice in 3 week-interval with 1000$\mu\textrm{g}$ and 2000$\mu\textrm{g}$ of sustained releasing rPST per kg body weight, respectively. Pigs in DI group were injected intramuscularly with 100$\mu\textrm{g}$ of rPST everyday for 6 weeks. Blood was collected from anterior vena cava just before the first treatment, and at four weeks and six weeks of experiment. Hematological parameters and blood chemical parameters indicating liver function, kidney function, electrolyte metabolism, mineral metabolism and lipid metabolism were determined. Necropsy and urinalysis were performed after final blood collection. The results were summarized as follows, and it is concluded that rPST administration does not affect pig health negatively. 1. rPST administration did not affect kidney function as manisfested by BUN, creatinine and urinalysis. 2. rPST administration did not affect liver function as manisfested by total protein, albumin, serum AST activity serum ALT activity serum ALP activity, serum LDH activity, serum GGT activity and serum SDH activity. 3. rPST administration did not affect skeletal muscle, cardiac muscle and brain as manifasted by serum AST activity and serum LDH activity. 4. rPST administration increased blood glucose level within normal range. 5. rPST administration did not affect lipid metabolism as manisfested by triglyceride, cholesterol, and phospholipid concentrati on. 6. rPst administration dia not affect mineral metabolism as manisfested by calcium, phosphorus, magnesium and iron concentration. 7. rPST administration did not affect electrolyte metabolism as manisfested by Na, K, chloride concentration. 8. rPST administration did not affect erythrocyte count, leukocyte count, thrombocyte count, and plasma fibrinogen level.

• 방사선산업학회지
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• 제7권2_3호
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• pp.171-176
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• 2013

In previous study, the novel nanosized curdlan-silica complex for a sustain-releasing effect was developed by using gamma-irradiation. It can be applicable to use in various sustainr-eleasing formulation in agriculture industry. This study was conducted to investigate its storage stability and environmental toxicity in an accelerated condition. The complex samples were treated with high temperature condition ($65^{\circ}C$) during 3 weeks, and then sustain-releasing property of complex was verified thereby using Ion Chromatography on a weekly basis. The morphology of the complex was characterized using scanning electron microscopy (SEM). Results of Ion Chromatography analysis showed that sample treated for 3 weeks was similar to sustain-releasing pattern of non-treatment sample. We verify concluded that the complex is able to keep its sustain-releasing property and sustained-releasing in 3 years. Also the formulation has no environmental toxicity.

• 한국식물병리학회:학술대회논문집
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• 한국식물병리학회 2002년도 총회 및 추계학술발표회
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• pp.62.2-63
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• 2002

• Parasites, Hosts and Diseases
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• 제44권4호
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• pp.361-366
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• 2006

Sustained-releasing praziquantel (SRP) tablet was designed for single dose treatment regimen of clonorchiasis. A previous pre-clinical study confirmed its sustained-releasing characteristics and a better cure rate than conventional praziquantel (PZQ). In this clinical study, the pharmacokinetics of this SRP tablet were investigated in human volunteers (phase 1; 12 volunteers), and its curative efficacy was examined in clonorchiasis patients (phase 2; 20 volunteers). In the phase 1 clinical study, blood concentrations of both tablets showed wide individual variation. The $AUC_{last}$ of SRP was $497.9{\pm}519.0ng{\cdot}hr/ml\;(mean{\pm}SD)$ and PZQ of $628.6{\pm}695.5\;ng{\cdot}hr/ml$, and the $AUC_{inf}$ of SRP was $776.0{\pm}538.5\;ng{\cdot}hr/ml$ and of PZQ $658.6{\pm}709.9\;ng{\cdot}hr/ml$. $C_{max}$ values of SRP and PZQ were $90.7{\pm}82.2ng/ml\;and\;214.9{\pm}251.9\;ng/ml$, and $T_{max}$ values were $3.42{\pm}1.43\;hr\;and\;1.96{\pm}1.23\;hr$, respectively. SRP tablets showed similar AUC values, but lower $C_{max}$ and longer $T_{max}$ values than PZQ. In the phase 2 study, SRP at 30 mg/kg (single dose) achieved a 60% cure rate and a 95.5% egg reduction rate. The cure rate of a single dose SRP was unsatisfactory compared with that of the conventional PZQ dose, but much better than that achieved by a single dose PZQ.

• 대한수의학회지
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• 제44권1호
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• pp.113-120
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• 2004

1% iodophor loaded microspheres of PLGA (Poly[DL-Lactide-co-Glycolide]) were prepared by solvent evaporation method and were applied to the cows on dry period for evaluating it's preventive effects on intramammary infections. The morphology of the microspheres were evaluated using scanning electron microscopy and their releasing patterns were investigated. On investigating idophor releasing patterns of the microsphere, burst releasing pattern was detected until 2 days after in vitro incubation and sustained releasing was observed until 4 weeks. In field trial of teat dipping solution containing idophor loaded microspheres in dry cows showed significant preventive effects of intramammary infection caused by S. aureus, S. agalactiae, coagulase negative Staphylococci and coliform bacteria (p<0.05).

• Journal of Pharmaceutical Investigation
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• 제26권2호
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• pp.119-124
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• 1996

To develop oral controlled release dosage forms, ionic interactions between polymers and drugs were evaluated. Hydroxypropylmethyl cellulose and carboxymethylene were used as model nonionic and ionic polymers, respectively. 5-fluorouracil, propranolol-HCl and sodium salicylate were selected as model nonionic, cationic and anionic, respectively. Polymer-drug mixtures were compressed into tablets and drug release kinetics from these tablets were determined. Drug release from the tablets made of the nonionic polymer was not affected by the charge of drugs, rather, was regulated by the solubility of drugs in different pH releasing media. However, drug release kinetics were significantly affected when drug-polymer ionic interactions exist. Enhanced drug release was observed from anionic drug-anionic polymer tablets due to ionic repulsion, whereas drug release was retarded in cationic drug-anionic polymer tablets owing to ionic attractive force. Therefore, the results suggested that the polymer-drug interactions are important factors in designing controlled release dosage forms.

• Applied Biological Chemistry
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• 제35권2호
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• pp.76-81
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• 1992

원제와 무기증량제의 혼합분말을 유용성 점결제 stearly alcohol 혹은 ethyl cellulose로 조립한 KC-7079, isoprothiolane, perfluidone 및 tricyazole 입제를 $25^{\circ}C$ 항온조건하에서 물이 담긴 비이커에 침적하고 일정시간 간격으로 수중 유효성분농도를 분석하여 입제의 용출속도를 측정하였다. 입제의 수중용출속도는 점결제 첨가량에 따른 입제의 수중붕괴성, 사용한 점결제의 종류 및 원제의 물에 대한 용해도에 따라 크게 영향을 받았다. Stearyl alcohol 첨가입제의 수중붕괴성은 제제방법에 따라 달라져서 수중에서 붕괴되지 않고 원형을 유지하기 위한 점결제 첨가량은 sodium dodecylbenzene sulfonate 수용액(0.5%)으로 반죽하여 조립할 때는 8%, methanol로 반죽하여 조립할 때는 3% 이상 요구되었다. Stearyl alcohol을 점결제로 사용한 KC-7079 입제는 점결제 첨가량이 증가할수록 수중붕괴성이 감소하여 유효성분의 초기 용출속도가 크게 감소하였으며, 붕괴하지 않는 입제는 점결제 첨가비가 증가하여도 용출속도가 거의 변하지 않았다. Ethyl cellulose가 0.5% 이상 첨가된 입제는 수중에서 붕괴하지 않았으며, 점결제 첨가비가 증가할수록 유효성분의 용출지연효과가 증가하였다. 또한 용출지연효과는 원제함량이 작은 입제에서 현저하였다. Stearyl alcohol 첨가제제는 KC-7079와 perfluidone의 용출을 지연시킨 반면 ethyl cellulose 첨가제제는 모든 원제에 대하여 용출을 지연시킬 수 있었다. 또한 이들 유용성 점결제로 조립한 입제는 원제의 수용해도가 작을수록 용출지연효과가 뚜렷하였다.