Effect of vacuum cooking treatment on physicochemical and structural characteristics of purple-flesh potato

Cook-vide (CV, vacuum boiling) and sous-vide (SV, cooking in a vacuum-sealed pouch) have been applied to cook purple-flesh potatoes. Response surface methodology (RSM) sets up the work conditions of temperatures (78 92 °C) and times (16 44 min). Textural parameters, colour and anthocyanins have been measured in cooked samples, and microstructure of cooked tissues was observed with cryo-SEM technique. CV and SV provided similar hardness (P > 0.05), while SV treatments provided samples more adhesive and cohesive than CV ones (P ≤ 0.05). Micrographs of cooked samples showed rounder cells in cook-vide samples and higher swelling than in sous-vide ones. SV treatment avoided the leaching into the water of anthocyanins (chromophore) retaining more of them in potatoes (P ≤ 0.05), as a consequence of which total colour difference was lower in SV samples compared with CV ones (P ≤ 0.05). Particularly, CV samples were lighter (higher values of L*) and less reddish (lower values of +a*) than SV ones (P ≤ 0.05).Consuelo Iborra-Bernad has received research grant from the Generalitat Valenciana. Purificacion Garcia-Segovia declares that she has no conflict of interest. Javier Martinez-Monzo declares that he has no conflict of interest.Iborra Bernad, MDC.; García Segovia, P.; Martínez Monzó, J. (2014). Effect of vacuum cooking treatment on physicochemical and structural characteristics of purple-flesh potato. International Journal of Food Science and Technology. 49(4):943-951. doi:10.1111/ijfs.12385S943951494Alarcão-E-Silva, M. L. C. M. M., Leitão, A. E. B., Azinheira, H. G., & Leitão, M. C. A. (2001). The Arbutus Berry: Studies on its Color and Chemical Characteristics at Two Mature Stages. Journal of Food Composition and Analysis, 14(1), 27-35. doi:10.1006/jfca.2000.0962Alvarez, M. D., & Canet, W. (1999). 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Seed germination and seedling development ecology in world-wide populations of a circumboreal Tertiary relict

Ecological traits of the circumboreal plant Viburnum opulus were examined to improve understanding of the variation of populations occurring in the same biome but on different continents. Seedling development/emergence is shown to be highly similar but some degree of variation was present in other traits, among populations