Citrinin is a toxic product usually produced during theMonascusfermentation. The presence of citrinin in xuezhikang capsule has been a concern due to its ingredient which is derived frommonascus-fermented rice. A rapid and sensitive RP-HPLC method with fluorescence detection at λex= 331 nm and λem= 500 nm for analysis of citrinin inMonascus-fermented products was developed to analyze citrinin inMonascus-fermented products. The chromatography was performed with mobile phase containing acidified water and acetonitrile. The calibration curve was linear (r = 0.9999) over a range of 0.0107- 0.537 μg/mL. The limit of detection (LOD) and the limit of quantitation (LOQ) were 0.187 ng/mL and 0.6 ng/mL respectively. The analysis of xuezhikang capsules using the developed method suggested that the product does not contain detectable citrinin and the result has been further confirmed using independent LC-MS/MS analysis. The proposed method has also been applied to analyze 11 samples of otherMonascus-fermented products. The results suggested that there were no detectable citrinin in 4 of the 11 samples, however citrinin with the levels between 0.10-594 ng/kg has been detected in the other 7 samples. It indicates that the proposed method can also be applied to carry out the quantitative detection of citrinin for otherMonascus-fermented products.

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紫外光谱表征确定了 TBPO-CnmimNTf2中萃取机理的差异性. 萃取中存在两种萃合物, 即 UO2(TBPO)3(NO3) + 和 UO2(TBPO)3 2+ , 其中 UO2(TBPO)3(NO3) + 的比例从 C2mimNTf2体系到 C8mimNTf2体系逐渐增加.