Starch modification by ozone: Correlating molecular structure and gel properties in different starch sources

Author(s)

Castanha, Nanci ^{[1, 2]} ; Miano, Alberto C. ^[3] ; Jones, Owen G. ^{[4, 2]} ; Reuhs, Bradley L. ^{[4, 2]} ; Campanella, Osvaldo H. ^[5] ; Augusto, Pedro E. D. ^{[1, 6]}

Affiliation

^[1] Univ Sao Paulo, Dept Agrifood Ind Food & Nutr LAN, Luiz de Queiroz Coll Agr ESALQ, Piracicaba, SP - Brazil

^[2] Purdue Univ, Dept Food Sci, Smith Hall, W Lafayette, IN 47907 - USA

^[3] Univ Privada Norte UPN, Direcc Invest & Desarrollo, Trujillo - Peru

^[4] Purdue Univ, Whistler Ctr Carbohydrate Res, Smith Hall, W Lafayette, IN 47907 - USA

^[5] Ohio State Univ, Dept Food Sci & Technol, Columbus, OH 43210 - USA

^[6] Univ Sao Paulo, Food & Nutr Res Ctr NAPAN, Piracicaba, SP - Brazil

• Document type: Journal article
• Source: FOOD HYDROCOLLOIDS; v. 108, NOV 2020.
• Web of Science Citations: 5

Abstract

Cassava, corn and potato starches were subjected to ozone processing under the same conditions, in order to allow comparisons. The molecular structure was evaluated using two chromatographic analyses: high-performance size-exclusion chromatography (HPSEC) coupled to multiangle laser light scattering (MALLS) and differential refractive index (RI) detectors, and gel permeation chromatography (GPC). Both proved the molecular depolymerization caused by ozonation, as well as illustrated the different behavior of each starch source - in special in relation to their molar mass dispersity. The granular morphology was not affected by ozone processing. On the other hand, the starch properties were affected by ozonation. In general, the apparent viscosity decreased during pasting, as well as the complex modulus (G{*}) of the immediately formed gels. After cooling and storage, however, the gels' strength increased or decreased due to ozonation, depending on the starch concentration. In general, results for cassava and potato starches were similar, while corn starch presented an opposite behavior. The results illustrated the relationship among ozonation conditions, starch source and analysis conditions, as well as their influence on the samples' behavior and functional properties. (AU)

• FAPESP's process: 16/18052-5 - +Pro²FOOD: emerging technologies to enhance food processing and properties
• Grantee: Pedro Esteves Duarte Augusto
• Support Opportunities: Regular Research Grants
• FAPESP's process: 19/05043-6 - NewDRYING: new strategies to enhance food drying
• Grantee: Maria Antonia Calori
• Support Opportunities: Regular Research Grants