Title: Experimental values and correlations of some thermal properties of fresh and osmotically dehydrated stone fruits

Authors: Anabel Rodriguez; María Marcela Rodríguez; Rodolfo Horacio Mascheroni

Addresses: Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA) (CONICET La Plata – UNLP), Calle 47 y 116. (1900) La Plata, Buenos Aires, Argentina ' TECSE-UNICEN, Olavarría, Buenos Aires, Argentina ' Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA) (CONICET La Plata – UNLP), Calle 47 y 116. (1900) La Plata, Buenos Aires, Argentina; MODIAL – Facultad de Ingeniería (UNLP), La Plata, Buenos Aires, Argentina

Abstract: Nectarines, plums and peaches were dehydrated with osmotic solutions (glucose at 60°Brix or sorbitol at 60°Brix) at temperature of 35°C for scheduled periods (0.5, 1, 2, 4, 6, 8 h). Thermal properties of fresh and osmotically dehydrated fruits were measured by DSC where samples were heated from −40°C to 40°C at a rate of 2°C min⁻¹. In this work, we obtained experimental data on the variation of water content and soluble solids during the osmotic dehydration of nectarines, peaches and plums in solutions of glucose or sorbitol; experimental data for enthalpy of fresh and osmotically dehydrated nectarines, plums and peaches as a function of temperature and type of osmotic solute; correlations for initial freezing temperature of osmotically dehydrated stone fruits as a function of water content and type of dehydrating solute and correlations between heat capacity or enthalpy and temperature for some fresh and osmotically dehydrated stone fruits.

Keywords: osmotic dehydration; stone fruits; correlations; initial freezing point; thermophysical properties; fresh fruit; nectarines; plums; peaches; water content; soluble solids; heat capacity; enthalpy; temperature.

DOI: 10.1504/IJPTI.2014.068709

International Journal of Postharvest Technology and Innovation, 2014 Vol.4 No.2/3/4, pp.138 - 150

Received: 05 Oct 2013
Accepted: 27 Jun 2014
Published online: 18 Apr 2015 *

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