Conversion of waste cooking oil by rhodococcal lipase immobilized in gellan gum Maegala Nallapan Maniyam, Hazeeq Hazwan Azman, Hasdianty Abdullah and Nor Suhaila Yaacob E3S Web Conf., 277 (2021) 03001 Published online: 24 June 2021 DOI: 10.1051/e3sconf/202127703001