High performance liquid chromatography with ELSD

Hi, I am working on phytochemistry and I am facing problem with development of method for Sarsasapogenin on HPLC. As we know Sarsasapogenin has very weak UV absorption so It cant be detected on UV detector.

So, I am trying to detect It on ELSD ( Model: Varian 385 LC ) but still I cant find any peak.

Can anybody help?

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