This study was aimed at evaluating the hypouricemic effect of rape bee pollen from Qinghai province in China. Rape bee pollen crude extracts (RPCE) was obtained by n-butanol extraction and purified by polyamide resin and AB-8 resin respectively to generate five fractions (fraction 1-5). In vitro, fraction 5 had strongest inhibition on xanthine oxidase (XO) (IC50 = 0.21 +/- 0.02 mg mL(-1)) among five fractions and had reversible and mixed inhibitory effect on XO. Fraction 5 was further purified and then generated fraction 5'. In vivo, fraction 5' had lower serum UA level and could reduce serum BUN, Cr levels and hepatic XO activity more effectively than RPCE in potassium oxonate-induced hyperuricemic mice. Moreover, fraction 5' had higher CAT activity and content of GSH in hyperuricemic mice. Six compounds including quercetin-3-O-(2 ''-O-glucopyranosyl)-glucopyranoside (peak 1), quercetin-3-O-(2 ''-O-glucopyranosyl)-rhamnopyranoside (peak 2), kaempferol-3-O-(2 ''-O-glucopyranosyl)-glucopyranoside (peak 3) and N', N ''-di-p-coumaroylspermidine (peak 4-6) in RPCE were identified by using HPLC-ESI-QTOF-MS/MS, whereas only peak 4 to 6 were found in fraction 5'. This study shows that rape bee pollen has potential clinical application value as an effective anti-hyperuricemia bioactive drug or functional food.
[1]Huazhong Agr Univ, Coll Food Sci & Technol, Wuhan 430070, Hubei, Peoples R China.
[2]Huazhong Univ Sci & Technol, Union Hosp, Tongji Med Coll, Dept Cardiol, Wuhan 430022, Hubei, Peoples R China.
[3]Huazhong Agr Univ, Key Lab Environm Correlat Dietol, Minist Educ, Wuhan 430070, Hubei, Peoples R China.
[4]Wuhan Engn Res Ctr Bee Prod Qual & Safety Control, Wuhan 430070, Hubei, Peoples R China.
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