gradient clution的用法和樣例：
例句
- METHODS Gradient elution HPLC was used to analyze the alcohol extracts of Radix Salviae Miltiorrhizae.
方法采用梯度洗脫高效液相色譜法分析丹參乙醇提取物。 - In this way, the different grades of acetonitrile and methanol were tested to show the feasibility with which they are applied in gradient elution.
按照此法，對國產(chǎn)不同等級的乙腈和甲醇進(jìn)行了測試，指明這些試劑用于梯度洗脫的可能性。
