Conservação e manutenção pós-colheita de banana Prata Gorutuba com uso de 1-metilciclopropeno

Abstract

Banana is one of the most consumed fruits in the world due to its nutritional characteristics and its various forms of consumption. However, as a climacteric fruit, with high respiratory rate and high ethylene production after harvest, it has a relatively short shelf life. The objective of this work was to evaluate the effect of 1-methylcyclopropene (1-MCP) associated with low density polyethylene bags (LDPE) on conservation and maintenance of postharvest quality of banana 'Prata Gorutuba' stored under refrigeration. The fruits were subjected to treatments of 0; 50; 100; 150 and 200 ηL.L¹ 1-MCP, inserted in the packaging bag and stored for 25 days in refrigeration chamber (14.5 plus/minus 1 deg * C) and relative humidity of (95% plus/minus 5)% After this period the fruits were removed from the bags and kept at a temperature of 25 plus/minus 1 deg * C Bananas were evaluated for firmness, soluble solids, titratable acidity, SS/TA ratio, pH, starch, total sugars, reducing sugars, non-reducing sugars and skin color. The experiment was conducted in a completely randomized design, factorial 5 * 5 five concentrations of 1-MCP (0; 50; 100; 150 and 200 ηL.L¹) and five sampling days (1, 2, 3, 4 and 5 days after storage), with four replications and a bouquet of four fruits per experimental unit. The data were submitted to analysis of variance and regression. It was also performed the Dunnett test at 5% probability in order to compare the witness (day of storage) with the fruits withdrawn from packaging bags (25th day of storage). The applications of 100, 150 and 200 eta*L .L^ -1 1-MCP in bananas 'Prata Gorutuba' for 8 hours delays the onset of ripening by approximately 25 days when packed in LDPE and stored under refrigeration (14.5 deg * C * 5 plus/minus 1) , without causing changes in their physical and chemical characteristics. The fruits treated with 100, 150 and 200 nL.L-¹ 1-MCP had normal ripening after unpacking and exposure to temperature of 25 plus/minus 1 deg * C.