Physicochemical and microbiological quality of raspberries 
(Rubus idaeus) treated with different doses of gamma irradiation

Isabela   Costa GUIMARÃES; Evandro  Galvão Tavares MENEZES; Priscilla   Silva de ABREU; Ariel   Costa RODRIGUES; Paulo Rogério   Siriano BORGES; Luis Roberto  BATISTA; Marcelo Angelo   CIRILO; Luiz Carlos   de Oliveira LIMA

Physicochemical and microbiological quality of raspberries (Rubus idaeus) treated with different doses of gamma irradiation

Autores

Isabela Costa GUIMARÃES

Evandro Galvão Tavares MENEZES

Priscilla Silva de ABREU

Ariel Costa RODRIGUES

Paulo Rogério Siriano BORGES

Luis Roberto BATISTA

Marcelo Angelo CIRILO

Luiz Carlos de Oliveira LIMA

Editor

Sociedade Brasileira de Ciência e Tecnologia de Alimentos

Descripción

This study was conducted to evaluate the physicochemical and microbiological characteristics of raspberries exposed todifferent radiation doses. The fruits were harvested in the city of Campestre, MG, packed in polyethylene bags, and transportedto the Federal University of Lavras (UFLA), where they were separated into 4 lots. Irradiation was performed at the Centerfor Development of Nuclear Technology in Belo Horizonte, MG. The doses used were 0 (control), 0.5, 1.0, and 2.0 kGy. Afterirradiation, the fruits were transported back to UFLA and stored at 1 °C and 95% relative humidity (RH) for 12 days. Thephysicochemical analyses for mass loss, total soluble solids, titratable acidity, pH, total soluble sugars, total soluble pectin,firmness, vitamin C content, total antioxidant activity, and total phenolic, and the microbiological assays (coliform at 35 and45 °C, psychrotrophic and filamentous fungi and yeasts) were performed after 0, 3, 6, 9, and 12 days of storage. Lower lossof mass and filamentous fungi and yeast count were observed in the irradiated fruits, and 2 kGy was determined as the mosteffective dose for microbial control, but this irradiation dose also resulted in increased loss of fruit firmness.