Effect of High Hydrostatic Pressure, alkaline and combined treatments on corn starch granulesmetal binding: Structure, swelling behavior andthermal properties assessment

DELADINO L.; NAVARRO, ALBA; SCHNEIDER-TEIXEIRA ALINE; MOLINA GARCIA ANTONIO; PLOU FRANCISCO J. ; DELADINO L.; NAVARRO, ALBA; SCHNEIDER-TEIXEIRA ALINE; MOLINA GARCIA ANTONIO; PLOU FRANCISCO J.

FOOD AND BIOPRODUCTS PROCESSING

INST CHEMICAL ENGINEERS

Año: 2017 vol. 102 p. 241 - 249

0960-3085

Modification of corn starch granules to transform them into carriers for molecules of nutri-tional interest was assayed by alkaline and high pressure treatments. Changes in thegranular structure of starches were revealed by porosimetry and swelling power studies,while confocal microscopy evaluated the mode of disruption of the granules. Both alkaliand high pressure treatments increased the number of pores in the granules while the com-bined procedures led to a central disruption and an increased deep pore number. The highpore volume found in alkali treated starches resulted in a high swelling power and createdmore binding sites to load high amounts of minerals, such as zinc and magnesium, as deter-mined by atomic emission spectrometry. The extent of gelatinization process was affecteddifferently in treated starches. The reduction in temperature and enthalpy, associated tohigh pressure granular starch suspensions, was moderated by the creation of new chargedinteractions due to alkali addition.