No abstract

RESUMO -Uvas 'Isabel' foram tratadas após a colheita com cloreto de cálcio (CaCl 2 ) e submetidas a atmosfera modificada para avaliação da manutenção de sua qualidade durante o armazenamento, a 12+1 °C e 85+2% de UR. O experimento foi conduzido em delineamento inteiramente casualizado, em esquema fatorial 5 x 2 x 5, com 3 repetições, sendo cinco doses de CaCl 2 (0,0; 0,5; 1,0; 2,0 e 4,0%), dois tipos de atmosfera [ambiente e modificada (AM)] e cinco períodos, durante o armazenamento refrigerado. As avaliações foram acidez titulável (AT), sólidos solúveis (SS), relação SS/AT, pH, ácido ascórbico, incidência de podridão, perda de massa, aparência do engaço e índice de degrana. A AM reduziu a perda de massa, a incidência de podridão e manteve a aparência verde do engaço, ampliando a vida útil de uva 'Isabel' em seis dias. Doses de CaCl 2 entre 0,5 e 2,0% reduziram a incidência de podridão. A aplicação de CaCl 2 associado à AM reduziu a degrana em uva 'Isabel' durante o armazenamento refrigerado. Termos para indexação: Vitis labrusca, degrana, aparência do engaço, podridão. QUALITY OF 'ISABEL' GRAPE TREATED WITH CALCIUM CHLORIDE IN POSTHARVEST AND STORED UNDER MODIFIED ATMOSPHEREABSTRACT-'Isabel' grapes were treated postharvest with calcium chloride (CaCl 2 ) and in modified atmosphere (MA) aiming its quality maintenance during storage at 12+1 °C and 85 +2% RH. The experiment was carried on a completely randomized design, in a factorial scheme 5 x 2 x 5 with three replications, with five levels of CaCl 2 (0,0; 0,5; 1,0; 2,0 and 4,0%), two types of atmosphere [room and modified atmospheres (MA)] and five evaluations, during cold storage. The evaluations were titratable acidity (TA), soluble solids (SS), SS/TA ratio, pH, ascorbic acid, decay incidence, mass loss, rachis appearance, and berry drop index. MA reduced mass loss, incidence of decay, and maintained the green rachis appearance. CaCl 2 doses among 0,5 and 2,0% reduced decay incidence. The application of CaCl 2 associated with MA reduced berry drop index in 'Isabel' grape during cold storage.

Tacinga inamoena (K. Schum.) [N. P. Taylor & Stuppy] is a native Cactaceae from the semiarid region of Northeastern Brazil whose fruit is eaten by the local population. It seems that there is a significant amount of functional compounds such as polyphenols and betalains in this fruit as reported for other well-known cacti. Although there are not enough studies that have been conducted, it has attracted interest regarding nutritional and functional viewpoints. In this sense, changes in bioactive compounds during maturation need to be evaluated as this fruit faces very unstable conditions during its development, which can lead to drastic changes of the constituents in the pulp and peel. Thus, the objective of this study was to evaluate the content of bioactive compounds and antioxidant activity during the maturation of Tacinga inamoena fruit from fruit bearing plants grown under Brazilian semiarid conditions. The contents of total chlorophyll declined parallel to an increase of the total carotenoids, yellow flavonoids, and betalains. However, a sharp difference between the content of these pigments in the peel and pulp was observed which characterized the main changes during fruit maturation. This fruit presented considerable carotenoid content, reaching 348 μg/100 g in the peel and 29 μg/100 g in the pulp when fully ripe. Total antioxidant activity (TAA) was higher in the pulp of more mature fruit. TAA was correlated with the bioactive compounds, with the exception of betacyanins, which were betalains present in smaller amounts in this fruit.