Effects of cutting and maturity on antioxidant activity of fresh-cut tomatoes

To investigate the changes in total antioxidant activity of fresh-cut tomato during storage, tomato fruits harvested at three different stages of maturity were cut into 7-mm thick slices and stored at 5°C. Intact (control) fruits were stored in the same conditions. The antioxidant activity was evaluated as the capacity to scavenge the radical ABTS.+ in both hydrophilic (HAA) and lipophilic (LAA) extracts. Cutting resulted in a decrease in the HAA compared to control fruits and did not influence significantly the LAA. Changes in LAA during storage were described by a simple exponential model developing towards an asymptotic end value. The HAA also decreased exponentially in the beginning of the storage time but increased again afterwards. The hydrophilic antioxidant activity was higher than the lipophilic antioxidant activity for all stages of maturity. The levels of HAA did not differ significantly due to ripening during storage while the LAA increased with ripenin

The biological shift factor. Biological age as a tool for modelling in pre- and postharvest horticulture

Individuals differ in development stage or biological age. This difference can be taken into account when modelling the quality behaviour of various fruits and vegetables. Even on a batch level, the same principle can be applied, provided the variation within a batch is not too large. By applying the biological shift factor, i.e. a shift in calendar time, the effects of different growing and harvesting condition can be included in modelling quality behaviour, which widely opens alleys for producing models applicable in the entire globalised food chain. The variation in biological shift factor over individuals in a batch and over several batches seems to exhibit a normal distribution pattern

Preharvest-postharvest interactions : the case of translucency and colour in tomatoes

Standard colour measurements can pose a serious problem for interpretation. For tomatoes the maturity at harvest does affect the colour that can maximally be obtained during postharvest storage. For more mature fruit up to 2 units (compared to 18 units tops) were found. This effect was ascribed to the level of a precursor produced during growth. More mature fruit also exhibit a more pronounced sensitivity to becoming translucent upon storage. This effect was also ascribed to the stage of development at harvest. Models were derived on plausible mechanisms to account for both effects of maturity at harvest in tomatoe

Componentes genéticos aditivos e não aditivos em maracujazeiro-azedo

O objetivo deste trabalho foi avaliar os componentes genéticos aditivos e não aditivos em caracteres qualitativos e produtivos de maracujazeiro, para determinar a ocorrência de efeitos genéticos dominantes. Foram estudados 12 híbridos F1, obtidos entre duas populações distintas, com uso do delineamento II de Comstock e Robinson. Durante o primeiro e o segundo ano (safrinha e primeira safra, respectivamente), foram avaliados os seguintes caracteres: número de frutos por planta, produção estimada, massa de fruto, massa de casca, massa de polpa, comprimento longitudinal, diâmetro equatorial, espessura de casca, teor de sólidos solúveis totais, acidez titulável total e coloração da polpa. A produção do biênio 2004/2005 foi estimada a partir do número total de frutos, multiplicado pela massa média dos frutos. Foram observados efeitos de dominância e, portanto, de heterose, no primeiro ano, para massa de matéria fresca, massa de polpa, massa de casca e diâmetro equatorial do fruto e, no segundo ano, para diâmetro equatorial do fruto e coloração da polpa. Houve predominância dos efeitos aditivos para número de frutos e massa de fruto. Os valores de herdabilidade são indicativos de que a população avaliada pode ser utilizada para a formação da população-base, para promover seleção recorrente

Long-range Angular Correlations On The Near And Away Side In P-pb Collisions At √snn=5.02 Tev

7191/Mar294