title: Physicochemical characteristics and in vitro digestibility of potato and cassava starches under organic acid and heat-moisture treatments.
abstract: A combination of acid (citric acid or lactic acid) and heat-moisture treatment was used to modify cassava and potato starches in this study. Changes in physicochemical properties and in vitro digestibility of the treated starches were investigated. The cassava starch contained 17.0% amylose and possessed A-type crystallinity, whereas the potato starch had 27.4% amylose and possessed B-type crystallinity. After acid and heat-moisture treatment, the crystalline structure of the cassava starch remained unchanged (A type), while the crystalline structure of the potato starch changed from B type to the C (B+A) type. The acid and heat-moisture treatment increased gelatinization temperature, peak and final viscosities of cassava starch but reduced peak and breakdown viscosities of the potato starch. After acid and heat-moisture treatment, rapid digestible starch contents of the treated cassava and potato starches were significantly reduced. However, resistant starch (RS) contents of the treated starches significantly increased as compared to the native starches. Citric acid was found to have high impact on formation of RS in starches. The RS contents of cassava and potato starches obtained under the citric acid and heat-moisture treatment were 40.2% and 39.0%, respectively, two times higher than those of the native starches.
authors.affiliation: School of Biotechnology, International University, Vietnam National University, Quarter 6, Linh Trung Ward, Thu Duc District, HoChiMinh City, Vietnam. Electronic address: pvhung@hcmiu.edu.vn.
authors.forename: Pham
authors.initials: P
authors.lastname: Van Hung
authors.affiliation: Institute of Biotechnology and Food Technology, Industrial University of HoChiMinh City, 12 Nguyen Van Bao, Ward 4, Go Vap District, HoChiMinh City, Vietnam.
authors.forename: Nguyen Thi Mai
authors.initials: NT
authors.lastname: Huong
authors.affiliation: Faculty of Chemical Engineering, University of Technology, Vietnam National University, 268 Ly Thuong Kiet Street, District 10, HoChiMinh City, Vietnam.
authors.forename: Nguyen Thi Lan
authors.initials: NT
authors.lastname: Phi
authors.affiliation: School of Biotechnology, International University, Vietnam National University, Quarter 6, Linh Trung Ward, Thu Duc District, HoChiMinh City, Vietnam.
authors.forename: Nguyen Ngoc Thanh
authors.initials: NN
authors.lastname: Tien
mesh_terms: D055598:Chemical Phenomena; D019343:Citric Acid / Q000737:chemistry*; D006358:Hot Temperature; D019344:Lactic Acid / Q000737:chemistry*; D002365:Manihot / Q000737:chemistry*; D011198:Solanum tuberosum / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*; D014783:Viscosity
chemical_list: D019343:Citric Acid; D019344:Lactic Acid; D013213:Starch
keywords: Citric acid; Heat-moisture treatment; Starch digestibility