I'm working on natural compounds . the methanol extract is having phytosterols, phenolic compounds and terpenoids. so how to separate the terpenoids....thanks in advance.
Usually terpenoids are much more apolar than polyphenols, so you can isolate them from your methanol extract by liquid/liquid extraction using chloroform. You can then easily monitor the extraction by TLC.
For further details you can read this paper: Jiang, Z. et al. "Extraction and analysis of terpenes/terpenoids". Curr Protoc Plant Biol, 2016.