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[求助] 急急急!求助细胞内核苷酸(ATP CTP UTP GTP dATP dGTP dCTP等)测定

求助各位大侠细胞内核苷酸的测定方法:如ATP CTP UTP GTP dATP dGTP dCTP等。
看了好多文献测定方法(离子对反相色谱法),但均未分离开。进样时基线先往下飘,然后往上飘,不知为何?求高人指点流动相条件!!!!流动相条件如下:
A相:8mM氢氧化四丁基铵、10mM KH2PO4,以盐酸调节pH=7;
相B:5mM氢氧化四丁基铵、30mM KH2PO4、30%乙腈、以NaOH调节pH=7
色谱柱为菲罗门柱,梯度洗脱:0-40min,60%B-80%B;50-60min,80%B-100B
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