Electronic nose system for rancidity and insect monitoring of brown rice Natawut Neamsorn, Viboon Changrue, Yaowalak Chanbang, Kaewalin Kunasakdakul, Parichat Theanjumpol and Phongprapan Kantakaew E3S Web Conf., 187 (2020) 04015 Published online: 08 September 2020 DOI: 10.1051/e3sconf/202018704015