• 약학회지
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• 제44권5호
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• pp.424-431
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• 2000

A biopharmaceutics drug classification system for correlation between in vitro dissolution and in vivo bioavailability is proposed based on recognizing that drug dissolution and gastrointestinal permeability are the fundamental parameters controlling the rate and extent of drug absorption. The objective of this study was to assess whether in vitro dissolution profiles of immediate-release beta-blocker tablets can be correlated with intestinal membrane permeability and/or in vivo bioavailability In vitro dissolution of the beta-blocker tablets was examined using KP VII Apparatus II methods at various pH. Intestinal membrane permeability was determined in vitro using the diffusion chamber method. Bioavailablity parameters were cited from literatures. The dissolution profiles did not accurately represent the in vivo bioavailablity However there were good correlations between intestinal membrane permeability and log P (noctanol/buffer). The correlations obtained in this study indicated that in vitro diffusion chamber method could be used to predict intestinal absorption in vivo.

• 대한환경공학회지
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• 제22권12호
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• pp.2107-2113
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• 2000

세 가지 비이온계 계면활성제(Brij 30, Tween 80, Triton X-l00)의 독성 평가와 polycyclic aromatic hydrocarbons(PAHs)의 생분해에 미치는 영향을 조사하였다. 사용된 세 가지 계면활성제 중에서 Brij 30이 가장 생분해가 잘 되는 것으로 나타났으며, 1.5 g/L까지 아무런 기질 저해 효과가 나타나지 않았다. 이는 사용된 계면활성제가 미생물에 탄소원으로 이용된다는 것을 나타낸다. 수용액상에서 naphthalene과 phenanthrene은 60시간 안에 완전히 분해되었지만 naphthalene의 경우 상당량이 휘발에 의해 손실됨을 알 수 있었다. 슬러리상에서 제어단계는 모래 슬러리의 경우 미생물에 의한 생분해였고, 점토 슬러리의 경우는 흡착표면에서 수용액으로의 물질 전달이었다. TOC분석을 통해 계면활성제를 포함한 거의 모든 기질이 분해됨을 알 수 있었다. pH 변화는 phenanthrene이 산 작용기를 가지는 중간산물로 분해됨을 나타내었다.

• 한국임상약학회지
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• 제6권2호
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• pp.14-18
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• 1996

This study was attempted to investigate the dissolution rate and the bioavailability after oral administration of commercially available norfloxacin tablets in rabbits. The dissolution test was conducted in artificial gastric juice using basket method with for norfloxacin preparations (A, B, C and D) which were chemically equivalent. The results were as follows ; The dissolution rate was increased in the order of four different brand A>D>B>C. Area under the plasma concentration curve and peak plasma concentration were increased in the order of brand A>D>B>C. Absorption rate constant and peak time were increased in the order of brand B>A>C>D, and there was a little difference in elimination rate constant and biological half-life. The correlation of the dissolution rate and relative bioavailability showed significant linear relationship. From the results of this experiment, the bioavailability of norfloxacin tablets in rabbits may be predicted from the results of dissolution rate studies.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2003년도 총회 및 춘계학술발표회
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• pp.137-140
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• 2003

This study presents a mathematical model for simulating the fate and transport of a reactive organic contaminant degraded through cometabolism in dual-porosity soils during the in situ bioaugmentations. To investigate the effect of dual-porosity on transport and biodegradation of organic hydrocarbons, a bimodal approach was incorporated into the model. Modified Monod kinetics and a microcolony concept [Molz et at., 1986〕 were employed to represent the effects of biodegrading microbes on the transport and biodegradation of an organic contaminant. The effect of permeability reduction due to biomass accumulation on the flow field were examined in the simulation of a hypothetical field-scale in situ bioaugmentation. Simulation results indicate that the presence of the immobile region can decrease the bioavailablity of biodegradable contaminants and that the placement of microbes and nutrients injection wells should be considered for an effective in situ bioaugmentation scheme.

• 자원환경지질
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• 제26권2호
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• pp.217-226
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• 1993

Stream sediment samples were collected in the vicinity of the Sambo Pb-Zn-barite mine in order to investigate dispersion patterns and pollution levels of heavy metals, and to find out their mode of occurrences. Those samples were analyzed for Cd, Cu, Pb, Zn, Fe, and Mn by using partial extraction and sequential extraction methods. Stream sediments of this studied area has been contaminated severely by Pb, Zn, and Cd. Dispersion patterns of heavy metals in those sediments are different according to their pollution source and sampling distance from the mine. The stream sediment pH is generally neutral in control area, and is slightly acidic in the lower part of tailing dam. The main pollution source of stream sediments was confirmed as tailing and mine drainage. Their pollution level depends mainly on inflowed water and distance from the mine. The tolerance index ranges from -0.9 to 0.7. The mode of occurrances of heavy metals in polluted stream sediment are identified as Fe-Mn oxides, organic bounded and carbonate-bounded compound which show high potential of bioavailablity.

• 한국지역사회생활과학회지
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• 제16권1호
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• pp.135-148
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• 2005

This study was conducted to investigate the bioavailability of calcium derived from starfish as a new calcium source. Four-week old Sprague-Dawley female rats were divided 6 groups. The rats were received experimental diets containing two kinds of Ca sources, CaCO₃ or starfish, and three levels of Ca, low (0.1 %), medium (0.5%) and high (1.0%), respectively, for 6 weeks. The parameters which related to Ca bioavailability were measured : Serum Ca concentration, Alkaline phosphatase(ALP) and GOT activities ; tissue Ca contents, bone dimension and Ca, P, Mg contents; Ca retention and apparent absorption. Starfish Ca-fed rats did not show any difference from CaCO₃-fed rats in terms of growth, food intake and FER. Serum Ca, ALP and GOT activities as well as tissue Ca contents were not different between CaCO₃- and starfish Ca-fed groups. Although dimension of femur and lumbar was not different between CaCO₃- and starfish Ca-fed rats, ash content was high in starfish Ca-fed rats. Ca and P contents of femur and lumbar were not different between both groups. Starfish Ca-fed groups showed higher Mg contents than CaCO₃-fed groups in both femur and lumbar. Ca absorption rate and retention rate were significantly higher in starfish Ca-fed rats. These results indicate that Ca derived starfish did not show any negative effect on growth and Ca metabolism of rats compared to calcium carbonate. Starfish Ca can be recommended as a good Ca source on the basis of higher Ca absorption and bioavailability.

• 한국자원식물학회지
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• 제34권5호
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• pp.433-442
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• 2021

본 연구에서는 발효홍삼과 발효하지 않은 홍삼을 BALB/c mouse에 경구투여한 후 혈청을 채취하여 주요 진세노사이드 생체이용율을 LC-MS/MS이용하여 분석하였다. 또한 이들의 항염효과를 IL-1𝛽, TNF 정량분석을 통해 비교하였다. 홍삼을 발효하였을 때, Rd를 포함한 전체적인 총 진세노사이드 함량이 증가하는 것을 확인하였으며, 마우스에게 투여하였을 총 진세노사이드 TG 의 혈액 검출량 AUC 또한 발효홍삼을 섭취하였을 때 높은 것을 확인하였다. C_max값 또한 동일하게 발효홍삼을 섭취하였을 때 증가하는 것을 확인하였다. 염증지표를 확인 하였을때 유도군과 비교하여 IL-1𝛽, TNF의 감소효과는 확인하였으나 그룹간의 유의적 차이는 발생하지 않았다. 이상의 연구결과로 probiotics가 발효홍삼의 ginsenoside 생체이용율을 향상시키는 중요한 요인임을 확인하였고, 이는 probiotics를 이용한 천연물 발효제제의 적용 확장과 그 산업적 활용성 증대에 기여할 수 있을 것으로 사료된다.