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2Trujillo WA, Sorenson WR, Laluzerne PS, Scheuerell CR. Comparison of various dilutions and solid-phase extraction cleanup on the determination of ephedrine-type alkaloids and internal standard recovery in ephedra botanical raw material and powdered extract[J]. J AOAC Int. 2005,88(4):1028-47. 链接： http://www.atypon-link.com/AOAC/doi/abs/10.5555/jaoi.2005.88.4.1028
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