6 research outputs found
Application of calcium–boron improve fruit quality, cell characteristics, and effective softening enzyme activity after harvest in mango fruit (Mangifera indica L.)
Modeling of gas transmission properties of polymeric films used for MA packaging of fruits
Uso de embalagens plásticas e cobertura de quitosana na conservação pós-colheita de lichias
Objetivou-se avaliar a efetividade da atmosfera modificada, através de embalagens plásticas e coberturas de quitosana, na conservação pós-colheita de lichias. O delineamento estatÃstico foi o inteiramente casualizado, disposto em esquema fatorial 5 x 7, com 3 repetições, onde o primeiro fator corresponde aos tratamentos: Testemunha; Bandejas rÃgidas de poliestireno revestidas com filme poliolefÃnico de 0,015mm (PD955); Bandejas rÃgidas de polietileno tereftalato (PET); Bandejas de poliestireno recobertas com filme de cloreto de polivinila (PVC) de 0,014mm; e Imersão em quitosana a 0,5%. O segundo fator foi o tempo de armazenamento, 0 (inicial); 4; 8; 12; 16; 20 e 24 dias, a 5 ºC (94 %UR). Cada parcela foi composta por 8 frutos, sendo que os tratados com quitosana foram contidos em bandejas rÃgidas de poliestireno, sem filme. Os resultados obtidos permitiram concluir que a proteção com filmes plásticos reduziu significativamente a perda de massa por lichias mantidas sob refrigeração, com redução na intensidade do escurecimento dos frutos. O tratamento com quitosana a 0,5%, em ácido tartárico a 10%, pH 0,8, mostrou-se efetivo na manutenção da coloração vermelha e na prevenção ao escurecimento, conservando a aparência dos frutos
Role of 1-MCP in regulating 'Kensington Pride' mango fruit softening and ripening
Ripening of mango fruit is characterized by softening of flesh which limits its shelf life. 1-MCP is nontoxic gas that delays fruit softening and improves quality of several fruit. Therefore, the role of 1-MCP in regulating fruit softening and quality of ‘Kensington Pride’ mango was investigated. Physiological mature fruits treated with 1-MCP (1 mL L-1), ethylene (10 mL L-1) or 1-MCP + ethylene for 12 h at ambient condition (20 ± 1 C). Untreated (control) as well as treated fruits were allowed to ripe at ambient temperature (20 ± 1 C) for 10 days. Ethylene production, respiration rate and other fruit ripening parameters were determined periodically. Climacteric peaks of ethylene production and respiration rate were significantly supressed by 1-MCP application as compared to ethylene-treated and control fruit. Exogenous application of ethylene accelerated the development of fruit colour, fruit softening with increased activities of exo-PG, endo-PG and EGase enzymes in the pulp tissues. Whereas, activities of fruit softening enzymes were significantly delayed and/or suppressed in 1-MCP-treated fruit. 1-MCP-treated fruit showed improved rheological properties (i.e., firmness, springiness and stiffness), decreased level of citric acid, malic acid, succinic acid, total organic acids, total sugars and sucrose than other treatments. 1-MCP inhibited the activities of fruit softening enzymes which consequently delayed the ripening and ripening related changes in ‘Kensington Pride’ mango