Optimization of microfibrillated cellulose isolation from cocoa pod husk via mild oxalic acid hydrolysis: A response surface methodology approach oleh L. Fernando Zambrano-Mite, Yanet Villasana, M. Lorena Bejarano, Christian Luciani, Dario Niebieskikwiat, Willin Álvarez, Dario F. Cueva, Daniel Aguilera-Pesantes, Lourdes M. Orejuela-Escobar