넙치, Paralichthys olivaceus에 nalidixic acid, piromidic acid, oxolinic acid의 경구투여 약물동태에 미치는 수온의 영향
Effect of temperature on pharmacokinetics of nalidixic acid, piromidic acid and oxolinic acid in olive flounder Paralichthys olivaceus following oral administration
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퀴놀론계 항균제인 nalidixic acid(OA), piromidic acid(PA), oxolinic acid(OA)를 사육수온(13 ± 1.5℃, 23 ± 1.5℃)에 따라서 넙치(평균체중 700 g)에 60 ㎎/㎏의 농도로 1회 경구 투여한 다음, 경시적인 혈청내 잔류농도를 분석하였다. 수온이 23±1.5℃의 경우, 투여 후 NA는 10시간째(11.55 ㎍/㎖), PA는 24시간째(3.79 ㎍/㎖), OA는 30시간째(1.12 ㎍/㎖)에 각각 최대혈중농도에 도달하였다. 수온이 13±1.5℃의 경우, 투여 후 NA는 10시간째(6.36 ㎍/㎖), PA는 15시간째(1.4 ㎍/㎖), OA는 30시간째(1.01 ㎍/㎖)에 각각 최대혈중농도에 도달하였다. NA와 PA의 넙치 혈중내 흡수정도는 수온 13 ± 1.5℃보다 수온 23 ± 1.5℃에서 매우 높게 나타났으며, NA의 넙치 혈중내 소실정도는 수온 13 ± 1.5℃보다 수온 23 ± 1.5℃에서 두드러지게 빨랐다. 한편 OA의 넙치 혈중내 흡수 및 소실정도는 사육수온에 크게 영향을 받지 않는 것으로 나타났다. NA 및 PA는 one-compartment model, OA는 two-compartment model로 해석하여 WinNonlin program을 이용, 약물동태학적 매개변수(parameter)를 조사하였다. 수온이 23 ± 1.5℃의 경우, 혈장농도-시간곡선하 면적(AUC)은 NA, PA, OA가 각각 258.26, 248.12 및 138.20 ㎍․h/㎖, 혈중최고농도의 도달시간(Tmax)은 10.67, 21.15 및 23.95 h, 혈중최고농도(Cmax)는 8.91, 3.09 및 1.06 ㎍/㎖로 계산되었다. 수온이 13 ± 1.5℃의 경우, AUC는 NA, PA, OA가 각각 341.45, 103.89 및 159.10 ㎍․h/㎖, 혈중최고농도의 도달시간은 7.72, 12.89 및 28.03 h, 혈중최고농도는 6.23, 1.22 및 1.02 ㎍/㎖로 계산되었다.
Abstract
Effects of temperature (13 ± 1.5℃, 23 ± 1.5℃) on the pharmacokinetic properties of nalidixic acid (NA), piromidic acid (PA) and oxolinic acid (OA) were studied after oral administration to cultured olive flounder, Paralichthys olivaceus. Serum concentrations of these antimicrobials were determined after oral administration of a single dosage of 60 ㎎/㎏ body weight (average 700 g). At 23 ± 1.5℃, the peak serum concentrations of NA, PA and OA, which attained at 10 h, 24 h and 30 h post-dose, were 11.55, 3.79 and 1.12 ㎍/㎖, respectively. At 13 ± 1.5℃, the peak serum concentrations of NA, PA and OA, which attained at 10 h, 15 h and 30 h post-dose, were 6.36, 1.4 and 1.01 ㎍/㎖, respectively. Better absorption of NA and PA was noted at 23±1.5℃ compared to 13 ± 1.5℃. The elimination of NA from serum of olive flounder was considerably faster at 23 ± 1.5℃ than at 13 ± 1.5℃. However, both absorption and elimination of OA were not affected significantly by temperature. The kinetic profile of absorption, distribution and elimination of these antimicrobials in serum were analyzed by fitting to a one- and two compartment model, with WinNonlin program. In the one compartment model for NA, AUC, Tmax and Cmax at 23 ± 1.5℃ were 258.26 ㎍*h/㎖, 10.67 h and 8.91 ㎍/㎖, respectively. The AUC, Tmax and Cmax at 13 ± 1.5℃ were 341.45 ㎍*h/㎖, 7.72 h and 6.23 ㎍/㎖, respectively. In the one compartment model for PA, AUC, Tmax and Cmax at 23 ± 1.5℃ were 248.12 ㎍*h/㎖, 21.15 h and 3.09 ㎍/㎖, respectively. The AUC, Tmax and Cmax at 13 ± 1.5℃ were 103.89 ㎍*h/㎖, 12.89 h and 1.22 ㎍/㎖, respectively. In the two compartment model for OA, AUC, Tmax and Cmax at 23 ± 1.5 ℃ were 138.20 ㎍*h/㎖, 23.95 h and 1.06 ㎍/㎖, respectively. The AUC, Tmax and Cmax at 13 ± 1.5℃ were 159.10 ㎍*h/㎖, 28.03 h and 1.02 ㎍/㎖, respectively.
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