Communications in Plant Sciences, vol 8, p. 62-68, 2018 (2018009)
Authors: Paula Porrelli Moreira da Silva, Renata Cristina Casemiro, José Guilherme Prado Martin, Leandro Francisco Carmo, Vanessa Groppo-Ortiz, and Marta Helena Fillet Spoto
Abstract: There are no studies regarding the irradiation of juçara pulp with a view to their conservation. Therefore, this study pursued to test the conservation of juçara pulp submitted to gamma radiation at the doses 0.0 (control), 2.5, 5.0; 7.5 and 10.0 kGy, and analyzed in 1, 7, 14, 21 and 28 days post irradiation. The samples were kept at 6 °C. We evaluate the bioactive compounds (anthocyanin and total phenolic), the enzymatic activity polyphenol oxidase and peroxidase, and the sensorial quality (acceptance test with hedonic scale) of the samples. The results of the biochemical analyses were submitted to the regression test and the sensorial analysis to the Tukey’s test at p<0.05. The samples remained within the prevailing legal standards regarding the microbiological quality. The anthocyanin levels decreased during the first week and its reduction was inversely proportional to the dose increments. The phenolic compounds showed high values in the first day, with a reduction in the later period and a constant average to the end. The activity of PPO and POD enzymes decreased in all periods, regardless of the radiation dose applied. The gamma radiation did not affect juçara pulp sensorial quality.
The gamma radiation affects the conservation and biochemical characteristics of juçara pulp under refrigeration, but it does not affect its sensorial quality.
Keywords: Euterpe edulis, Irradiation, Biochemical analyzes, Sensory quality, Shelf life. (more…)