Mango is a highly perishable fruit with a short post-harvest time due to the intense metabolic activity after harvesting. In attempt to evaluate the effects of chitosan in mango fruits, it was treated with 0%, 1%, 2% or 3% of chitosan solutions, placed into plastic trays, and stored at room temperature. Changes in physical and chemical parameters were evaluated. Chitosan delayed the climacteric peak, water loss and firmness. Further, few changes in soluble solid content, titratable acidity, pH of the pulp as well as in sugar content and decreased starch degradation were observed. Altogether, our results suggest chitosan edible coating effectively prolongs the quality attributes, affecting basic mitochondrial respiration and starch degradation rate.

RESUMO-a pitaia-rosa de polpa vermelha é uma cactácea com potencial para exploração econômica, devido aos seus componentes nutricionais e ao alto valor comercial; no entanto, poucas são as pesquisas quanto a suas características pós-colheita. o objetivo do trabalho foi caracterizar física, química e nutricionalmente pitaias-rosas de polpa vermelha. Frutos colhidos totalmente maduros foram sanitizados, selecionados e divididos em grupos de quatro frutos por repetição, constituindo um total de 30 amostras. em seguida, as amostras foram submetidas às seguintes avaliações: comprimento, diâmetro, espessura de casca, massa fresca, massa de casca e polpa, teor de umidade, firmeza da casca, sólidos solúveis, pH, acidez titulável, açúcares e fibra bruta, cromaticidade, ângulo hue e luminosidade da casca e da polpa, e o teor de nutrientes. Para os dados obtidos, foram determinados a média, o valor mínimo e máximo, desvio-padrão e o coeficiente de variação. A fruta apresentou valores elevados de conteúdo de água, teor de fibras e dos nutrientes nitrogênio, potássio, cálcio, ferro, manganês e zinco. Quanto ao teor de sólidos solúveis, a média observada foi de 13,14° Brix, e para acidez titulável,0,29 mg de ác. málico 100 -1 mL de suco. Verificaram-se para os açúcares valores de 5,56; 8,79 e 3,07 %, respectivamente, para os açúcares redutores, totais e não redutores. Quanto à coloração, os frutos apresentaram valores maiores para luminosidade e cromaticidade da casca e ângulo Hue da polpa. a pitaia-rosa de polpa vermelha (Hylocereus polyrhizus) apresenta características físicas, químicas e nutricionais interessantes para o consumo in natura. Termos para indexação: Hylocereus polyrhizus, frutas exóticas, cactáceas. PHYSICAL, CHEMICAL AND NUTRITIONAL CHARACTERIZATION OF PINK PITAYA OF RED PULPABSTRACT-the pink pitaya of red pulp is a cactacea with potential for economic exploitation, due to its nutritional components and high commercial value, however there is little research about its post-harvest characteristics. the aim of this study was to characterize physical, chemical and nutritionally pink pitaya of red pulp. Fruits harvested fully ripe were sanitized, selected and divided into groups of four fruits per repetition, constituting a total of 30 samples. then the samples were subjected to the following evaluations: length, diameter, peel thickness, fresh matter, peel and pulp mass, moisture content, peel firmness, soluble solids, pH, titratable acidity, sugars and crude fiber, chromaticity, hue angle and brightness of the peel and pulp and nutrient content. For the obtained data, it was determined mean, minimum and maximum values, standard deviation and coefficient of variation. The fruit showed high water content, content of fiber and nutrients nitrogen, potassium, calcium, iron, manganese and zinc. as for soluble solids content it was observed average of 13.14 ° Brix and titratable acidity 0.29 mg of Malic acid in 100 -1 ml of juice. For sugars were found values of 5.56, 8.79 and 3.07% respectively for the reducing sugar...

Guava is a typically tropical fruit highly perishable with a short shelf-life due to intense metabolic activity after harvested. In attempt to minimize the problems related to the postharvest, we evaluated the physiochemical characteristics and antioxidant system in guava fruits under chitosan coating at concentrations of 1%, 2%, and 3% stored at 25°C during 96h. The chitosan suppressed the respiratory rate, fresh weight loss, firmness and skin color with delay in the degradation of chlorophyll. In the treatment with 2% and 3% of chitosan in the solid soluble content and ascorbic acid were reduced; retarded the loss of titratable acidity during 96h after treatment. These treatment induced significant decreases in the phenylalanine ammonia-lyase activity and significantly increases of peroxidase Activity. Our results suggest that chitosan effectively prolongs the quality attributes in guava fruits after harvesting due to increases in the antioxidant processes, delaying the ripening during room temperature of storage.

RESUMO-A aplicação de novas tecnologias torna-se necessário para aumentar o período de comercialização da pinha (Annona squamosa ) que apresenta alta perecibilidade e vida útil curta. Com o objetivo de retardar a evolução do amadurecimento, as pinhas foram tratadas com 1-metilciclopropeno (1-MCP) nas concentrações de 0; 200; 400 e 600 nL L -1 , durante 8 horas, a 25ºC. Posteriormente, os frutos foram armazenados a 15ºC, durante 21 dias. Em intervalos de sete dias, amostras foram retiradas da câmara para análises quanto à firmeza, perda de massa fresca, coloração (cromaticidade e ºHue), pH, sólidos solúveis (°brix), acidez titulável, relação sólidos solúveis/acidez titulável, teor de amido, açúcares totais, açúcares redutores e sacarose. Não houve efeito significativo dos tratamentos quanto ao pH, sólidos solúveis, acidez titulável, relação sólidos solúveis/acidez titulável, perda de massa fresca e sacarose, somente efeito de tempo de armazenamento. A acidez titulável não apresentou modelo estatístico que explicasse o efeito da época de armazenamento. Houve interação significativa da concentração de 1-MCP e dos dias de armazenamento em relação à firmeza, coloração, teor de amido, açúcares totais e açúcares redutores. Quanto maior a dose de 1-MCP aplicado, mais lenta foi a evolução do amadurecimento, sendo que a concentração de 600 nL L -1 foi a que melhor retardou o amadurecimento . Termos para indexação -Annona squamosa, 1-MCP, Armazenamento. POSTHARVEST CONSERVATION OF CUSTARD APPLE WITH THE USE OF 1-METHYLCYCLOPROPENEABSTRACT-The application of new technologies is necessary to increase the marketing period of 'pinha' (Annona squamosa), which is highly perishable and presents short shelf life. Aiming at retarding the maturation evolution, 'pinhas' were treated with 1-methylcyclopropene (1-MCP) at concentrations of 0, 200, 400 and 600 nL L -1 during 8 hours at 25ºC. Then, the fruits were stored at 15ºC for 21 days. The fruits were taken from the chamber at 7-day intervals to be analyzed as to firmness, weight loss, color (chromaticity and ºHue), pH, total soluble solids, titratable acidity, soluble solids/acidity relation, starch content, total sugars, reducing sugars and sucrose. There was no significant effect of the treatments on pH, soluble solids, titratable acidity, solid soluble/titratable acidity relation, fresh mass loss or sucrose, but there was only the effect of the time of storage. The titratable acidity did not present a statistical model to explain the effect of the time of storage. There was a significant interaction of the concentration of 1-MCP and the days of storage in relation to firmness, color, starch content, total sugars and reducing sugars. The higher the dose of 1-MCP applied, the slower the maturation evolution. The concentration of 600 nL L -1 was the best to retard maturation and extend the shelf life of custard apple.

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