Supercritical CO2 extraction of red butterfly wing leaves: process parametric study towards extraction yieldMohd Azahar Mohd Ariff, Zulkifli Abdul Ghani, Noor ‘Aina Abdul Razak, Mohamed Syazwan Osman and Jefri JaafarMATEC Web Conf., 154 (2018) 01015DOI: https://doi.org/10.1051/matecconf/201815401015