Abstract
目的 建立HPLC法测定小儿高苯丙氨酸血症(HPA)患者尿液中新蝶呤(N)和生物蝶呤(B)含量的方法,以帮助临床对经典型苯丙酮尿症(PKU)和四氢生物蝶呤(BH4)缺乏症的诊断和鉴别诊断.方法 选用Cosmosil 5C18-AR-Ⅱ色谱柱(4.6 I.D.×250 mm),甲醇-水(8∶92)为流动相,用三维荧光检测器检测.结果 新蝶呤线性范围为1.60～40.0 ng/μl,生物蝶呤线性范围为1.73～43.2 ng/μl;最小检测限为0.16 ng/μl和0.1728 ng/μl.样品测定的变异系数(CV)值分别为2.18%和1.70%;原尿样品前处理时氧化的最佳时间为30 min;原尿样品不便于保存,氧化后可于室温或4℃冰箱保存3 d.结论 本方法准确、可靠、简便易行,灵敏度高,方法学实验结果满意,适用于临床HPA患儿的鉴别诊断。
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