Optimizing Edible Film from Corn Cobs with Surface Response Method Ni Ketut Sari, Adelia Hayu Regita, Dimas Wahyu Dwi Putra, Dira Ernawati and Widi Wurjani E3S Web Conf., 328 (2021) 08009 Published online: 06 December 2021 DOI: 10.1051/e3sconf/202132808009