it's a long time ago, in 1997, that I have purified cutin from tomatoes according to the methode of Salinas, refered in the attached paper. I'm sure that you will have no difficulties to obtain it. Since I'm retaired, I have not access to this publication.
Article Evidence for a constitutive cytoplasmic cutinase in ungermin...
Conduct preliminary analysis using laboratory chemical test methods. Then run TLC to know the type of fractions. After that Column Chromatography with HPLC, after isolated pure fraction run FT-IR, LC-MS, HNMR, CNMR for structure elucidation. You can read my papers too.