Effect of ohmic heating and vacuum impregnation on the quality and microbial stability of osmotically dehydrated strawberries (cv. Camarosa) |
| |
Authors: | J Moreno R Simpson N Pizarro K Parada N Pinilla JE Reyes S Almonacid |
| |
Affiliation: | 1. Department of Food Engineering, Universidad del Bio-Bio, Casilla 447, Chillán, Chile;2. Department of Chemical Engineering and Environment, Universidad Técnica Federico Santa María, Casilla 110-V, Valparaíso, Chile |
| |
Abstract: | The combined effect of osmotic dehydration/ohmic heating (OD–OH) and vacuum impregnation/ohmic heating (VI–OH) on physicochemical and quality parameters of strawberry (aw, color, firmness and microstructure), as well as on microbial stability of storage samples at 5 and 10 °C, was analyzed. Treatments were carried out with a 65% (w/w) sucrose solution at 30 °C, and ohmic heating at 9.2, 13, and 17 V/cm electric field strengths, corresponding to applied voltages of 70, 100, and 130 V. Dehydrated samples showed that water loss was greater in OD–OH treatments at 17 V/cm. The greatest solute gain, least firmness loss and least color loss were obtained in the VI–OH treatment at 13 V/cm. The shelf-life of strawberries treated with VI–OH at 13 V/cm and stored at 5 °C was extended from 12 d (control samples) to 25 d. Furthermore, the VI–OH treatment at 13 V/cm was the best processing condition for dehydrating strawberries. |
| |
Keywords: | Osmotic dehydration Ohmic heating Electric field Vacuum impregnation Microstructure Microbiology Strawberries |
本文献已被 ScienceDirect 等数据库收录! |
|