Panthakant Janepinich, Chutimon Satirapipathkul, Naparat Kasetsomboon and Piyaphong Yongphet 2023. Enhancing lutein extraction from marigolds through ultrasound-assisted optimization using response surface methodology. Maejo International Journal of Energy and Environmental Communication. 5, 1 (Feb. 2023), 14–19. DOI:https://doi.org/10.54279/mijeec.v5i1.248359.