C.A. Cardona is an associate professor of chemical engineering in the Pilot Plants of Biotechnology and Agroindustry at the National University of Colombia in Manizales. He is also a consultant in bioenergy and development for the Food and Agriculture Organization of the United Nations in Rome, Italy. O.J. Sanchez is an associate professor of food engineering in the Institute of Agricultural Biotechnology at the University of Caldas in Manizales, Colombia. L.F. Gutierrez is an assistant professor in the Department of Engineering at the University of Caldas in Manizales, Colombia.