1. Whistler Center for Carbohydrate Research and Department of Food Science, Purdue University, 745 Agriculture Mall Dr., West Lafayette, IN 47907-2009, U.S.A.
2. Instituto Politecnico Nacional, CEPROBI, Km. 6.5 Carr. Yautepec-Jojutla Col. San Isidro, Calle Ceprobi No. 8, Yautepec, Morelos, Mexico.
3. Corresponding author. Phone: (765) 494-5668. E-mail: hamakerb@purdue.edu