Where did you come up with a protocol requiring chloroform?
What are you actually trying to achieve?
the most commonly used solvents in the industry are Ethanol, n-Butane, hydrocarbon blends, and CO2. millions of dollars worth extracted every day. none of them chemically modify the target constituents (extract remains lipophillic).
have you wandered over to the Data Dump! (Scientific Papers) and read any books on the subject?