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- Physicochemical and Sensory Evaluation of ‘Rocha’ Pear Following Controlled Atmosphere StoragePublication . Galvis-Sánchez, A. C.; Fonseca, S. C.; Morais, A. M. M. B.; Malcata, F. XavierThe effects of several processing factors (storage time, time in the open air at room temperature, and overhead concentrations of O2 and CO2) on color, firmness, polyphenol oxidase (PPO) activity, and sensory attributes of pears (cv. Rocha) grown in 2 locations were studied using a multiple linear regression model. Backward elimination (F ≥ 0.005) was used to assess the significant factors. Extended storage time, long-time exposure at room temperature, and high O2 concentration played major roles on color changes assessed instrumentally and further confirmed by a sensory panel. Firmness was strongly affected by storage time and by time in the open air at room temperature. Finally, PPO activity was dependent on the growing location.
- Microstructural changes of 'rocha' pear following storage under controlled atmospherePublication . Fonseca, S. C.; Malcata, F. X.; Galvis-Sánchez, A. C.This research effort was aimed at evaluating the influence of storage (for 4 mo at 2°C), under various controlled atmospheres (viz. 1.9 kPa O2 + 4.9 kPa CO2, 1.9 kPa O2 + 0.5 kPa CO2 and 1.9 kPa O2 + 0 kPa CO2), on the microstructure of ′Rocha′ pear. Toward this goal, the morphology of cellular disassembly, as well as the quantity of granules and intercellular space using scanning electron microscopy (SEM), were tentatively correlated with sensory and instrumental firmness, by 1, 6 and 8 d of exposure to air, at room temperature, after storage. A specific methodology, based on panel evaluation of SEM images, was developed and statistically validated. The degree of cellular disassembly increased throughout exposure time to air at room temperature. Pears stored under 1.9 kPa O2 + 0.5 kPa CO2 yielded a degree of cellular disassembly similar to that of the control.
- Bioconservação de alimentos tradicionais por adição de bactérias ácido-lácticas e das suas bacteriocinasPublication . Jácome, S. L.; Todorov, S. D.; Fonseca, S. C.; Pinheiro, R.; Guerreiro, J. S.; Monteiro, V.; Fernandes, P.; Noronha, L.; Almeida, Gonçalo; Gomes, Ana M. P.; Pintado, M. E.; Silva, Cristina L. M.; Morais, Alcina M. M. B.; Silva, Joana; Teixeira, Paula; Vaz-Velho, Manuela
- Application of nisin and chitosan as antimicrobial agents in traditional cured and smoked “Alheira”Publication . Fonseca, S. C.; Jácome, S.; Pinheiro, R.; Alves, M. R.; Noronha, L.; Silva, J.; Almeida, G.; Todorov, S. D.; Pintado, M. E.; Gomes, A; Morais, Alcina M. M. B.; Vaz-Velho, M.; Teixeira, Paula
- Effect of CA-storage on the physical and sensorial quality of ‘Rocha’ pearPublication . Galvis-Sánchez, A. C.; Fonseca, S. C.; Morais, A. M. M. B.; Malcata, F. X.
- Maintaining optimal atmosphere conditions for fruits and vegetables throughout the postharvest handling chainPublication . Brech, J. K.; Chau, K. V.; Fonseca, S. C.; Oliveira, F. A. R.; Silva, F. M.; Nunes, M. C. N.; Bender, R. J.Optimal controlled and modified atmospheres (CA and MA) for fresh produce vary according to the specie, its maturity or ripeness stage, the temperature, and the duration of exposure. However, individual lots of produce are typically handled for different times and at different temperatures during storage, transportation, and retail display. In this paper, we review some of our previous work showing the potential for using different atmospheres for mangoes (Mangifera indica L.) and strawberries (Fragaria×ananassa Duchesne) depending on the anticipated storage length and temperature. Since it would be desirable, especially for produce transported over extended distances, as in marine transport, to maintain optimal atmosphere conditions throughout the postharvest handling chain, we also describe our procedure for designing a combination CA/MAP system that involves first designing the MAP for a particular commodity that will produce an optimal atmosphere for retail display conditions, then selecting a CA that will interact with the MAP to produce the optimal atmosphere within the packages during transportation at a lower temperature. An example of the design procedure is given from our work with fresh-cut kale (Brassica oleracea var. acephala DC.). Another example of this proposed MAP/CA system deals with its application to mixed load transportation of strawberries and snap beans (Phaseolus vulgaris L.).