Journal de la transformation et de la technologie des aliments

Abstrait

Studies on the Osmotic Dehydration and Rehydration Characteristics of Pineapple Slices

Fasogbon BM, Gbadamosi SO and Taiwo KA

The study investigated the influence of two osmotic conditions (50°Brix sugar and 47:3% w/w sugar/salt solutions) on osmotic dehydration (water loss, solid gain, electrical conductivity and pH of the medium) and rehydration characteristics (Dry-matter loss, rehydration capacity, electrical conductivity and pH of the medium) of dried pineapple slices. Pineapple slices were osmotically dehydrated (4 hr), and oven dried (60°C for 27 hr). Slices were rehydrated at 90°C for 15 min and at room temperature (RT) for 6 hr. Osmotic dehydration enhanced solid gain, water loss, dry-matter loss and rehydration capacity. Mass transfer (water loss and solid gain) was higher in sugar/ salt solution than in the sugar solution. Sugar/salt mix reduced the amount of electrolytes released into the medium. Regression models gave a good fit of high R² value when water loss, solid gain, and electrical conductivity variables were related, but dry-matter loss, rehydration capacity, pH and electrical conductivity gave low R² values.