RESUMEN
In modified atmosphere packaging of guava, moisture scavenger (MS) sachet containing 30-50â¯g of coarse silica gel and ethylene scavenger (ES) sachet containing 0-4â¯g of potassium permanganate was added as per central composite rotatable design. The headspace O2 and CO2 of the packages were studied at 4, 8 and 12⯰C for 30â¯days and thereafter the guava were left for two days to ripen at 30⯰C. After that the chilling injuries, percentage acceptable guava, peel color and pulp texture was analyzed. After two days ripening at 30⯰C the samples with 3â¯gâ¯ES and 46â¯gâ¯MS registered higher L∗, lower a∗ value & firmness (16.65â¯N), lowest chilling injury score. About 95% of guava was found acceptable in this treatment with 1.89-2.79% reducing sugar, 0.95-1.1% titrable acidity, 59% and 46.61% retention of total phenols and ascorbic acid respectively, resulting 32â¯days shelf-life of guava.
Asunto(s)
Atmósfera , Etilenos/química , Embalaje de Alimentos/métodos , Almacenamiento de Alimentos/métodos , Psidium/química , Temperatura , Ácido Ascórbico/análisis , Color , Frutas/química , Fenoles/análisisRESUMEN
The effect of five coating formulations viz.: (A) 5% Arabic gum (AG)+1% sodium caseinate (SC)+1% cinnamon oil (CE); (B) 5% AGâ¯+â¯1% SCâ¯+â¯2% CE; (C) 5% AGâ¯+â¯1% SCâ¯+â¯1% lemongrass oil (LG); (D) 5% AGâ¯+â¯1% SCâ¯+â¯2% LG; and (E) 5% AGâ¯+â¯1% SCâ¯+â¯2% CEâ¯+â¯2% LG on guava during 35â¯days storage at 4-7⯰C was investigated. Thereafter samples were allowed to ripen for five days at 25⯱â¯2⯰C. The quality of guava was analyzed at an interval of 7, 21, 35 and 40â¯days. The coating applications resulted in lower activity of PPO & POD, higher DPPH radical scavenging activity, higher retention of ascorbic acid, phenol & flavonoid content, exhibited slower rise of reducing and total sugar in guava pulp. Samples in treatment B and D were the best formulations for extending shelf-life of guava up to 40â¯days versus seven days of uncoated samples.