Pharmacokinetics and first-pass metabolism of astaxanthin in rats.
Astaxanthin is a carotenoid with antioxidant, anti-cancer and anti-inflammatory properties. The pharmacokinetics of astaxanthin after its intravenous (5, 10, and 20 mg/kg) and oral (100 and 200 mg/kg) administration and its first-pass extraction ratios after its intravenous, intraportal or intragastric (20 mg/kg) administration were evaluated in rats. The pharmacokinetic parameters of astaxanthin were dose dependent after its intravenous administration, due to the saturable hepatic metabolism of astaxanthin, but dose independent after oral administration. The gastrointestinal absorption of astaxanthin followed the flip-flop model. The hepatic and gastrointestinal first-pass extraction ratios of astaxanthin were approximately 0·490 and 0·901, respectively. Astaxanthin was metabolised primarily by hepatic cytochrome P-450 1A1/2 in rats. Astaxanthin was unstable up to 4 h incubation in four rat gastric juices and up to 24 h incubation in various buffer solutions having a pH of 1-13. The tissue/plasma ratios of astaxanthin at 8 and 24 h after its oral administration (100 mg/kg) were greater than unity for all tissues studied, except in the heart, at 8 h, indicating that the rat tissues studied had high affinity for astaxanthin.
Choi
Hye Duck
HD
College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, San 56-1, Sillim-Dong, Gwanak-Gu, Seoul 151-742, South Korea.
Kang
Hee Eun
HE
Yang
Si Hyung
SH
Lee
Myung Gull
MG
Shin
Wan Gyoon
WG
D000284:Administration, Oral; D000818:Animals; D004305:Dose-Response Relationship, Drug; D004355:Drug Stability; D005753:Gastric Mucosa / Q000378:metabolism; D007275:Injections, Intravenous; D008099:Liver / Q000378:metabolism; D008297:Male; D008748:Methylcholanthrene / Q000494:pharmacology; D011169:Portal Vein; D051381:Rats; D017207:Rats, Sprague-Dawley; D014018:Tissue Distribution; D024341:Xanthophylls / Q000008:administration & dosage / Q000378:metabolism / Q000493:pharmacokinetics
D024341:Xanthophylls; D008748:Methylcholanthrene; C005948:astaxanthine