Published

2015-07-01

Effect of cassava-starch coatings with ascorbic acidic and N-acetylcysteine on the quality of harton plantain (Musa paradisiaca)

Efecto de recubrimientos de almidón de yuca con ácido ascórbico y N-acetilcisteína en la calidad del plátano hartón (Musa paradisiaca)

Keywords:

Browning, polyphenol oxidase, fruit, vegetables (en)
Pardeamiento, polifenoloxidasa, frutas, vegetales (es)

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Authors

  • Carlos Julio Márquez Cardozo Universidad Nacional de Colombia
  • José Roberto Palacín Beltrán Universidad de Cartagena
  • Lorenzo Fuentes Berrio Universidad de Cartagena
The effect of coatings was evaluated on the quality of harton plantain fruits (Musa paradisiaca) in the postharvest stage. Solutions for three treatments were prepared from 50 g L-1 cassava starch (Manihot esculenta) with 30 g L-1 glycerol as the plasticizer and 6 g L-1 polyethylene glycol-600®; for anti-browning agents, 6 g L-1 ascorbic acid (AA) and 8 g L-1 N-Acetyl-Cysteine (NAC) were added. The fruits were coated by immersion, stored at 18 ± 4°C and 85% RH. Physicochemical properties were determined at 32 days postharvest. The applied coatings decreased the physiological weight loss (%WL) and resulted in a higher pulp firmness (PF); no significant difference was seen with a confidence level of 95% in the concentration of total soluble solids (TSS), acidity or maturity index. The skin color was measured by the CIE L*a*b* method, with an average L value of 70 for the fruits coated with the 6 g L-1 AA and 8 g L-1 NAC mixture, while the control fruits had a value of 57. Also, lower a* coordinate values and browning indices were found for the epidermis of the coated fruits. The enzymatic activity of the polyphenol oxidase decreased with the number of postharvest days for all of the treatments, being lower for the fruits with the mixture of anti-browning agents by 27%, as compared to the control. It was concluded that the coating mixture containing the anti-browning agents ascorbic acid, 6 g L-1, and N-acetyl-cysteine, 8 g L-1, showed a better effect as an alternative for storing fruits and prolonging the shelf-life of harton plantain.

El efecto de recubrimientos fue evaluado sobre la calidad de frutos de plátano Hartón (Musa paradisiaca) en la etapa de poscosecha. Se prepararon soluciones para tres tratamientos a partir de almidón de yuca (Manihot esculenta) 50 g L-1, con glicerol como plastificante 30 g L-1 y polietilen glicol-600® 6 g L-1, como agentes antipardeantes se adicionó ácido ascórbico (AA) 6 g L-1 y N-Acetil-Cisteína (NAC) 8 g L-1 y una mezcla de AA 6 g L-1 más NAC 8 g L-1. Los frutos se recubrieron por inmersión y se almacenaron a 18 ± 4°C y 85% de HR. Se determinaron las propiedades físico-químicas durante 32 días de poscosecha. Los recubrimientos aplicados disminuyeron la pérdida fisiológica de peso (%PP) y presentaron una mayor firmeza de la pulpa (FP), igualmente no se presentó diferencia significativa con un nivel de confianza del 95% en la concentración de sólidos solubles totales (SST), ni en la acidez e índice de madurez; el color de la epidermis fue medido instrumentalmente por el método CIE L*a*b*, se encontró para la coordenada L un valor medio de 70 para frutos recubiertos con la mezcla de AA 6 g L-1 más NAC 8 g L-1, mientras que para el control se encontró un valor de 57, además se encontraron menores valores para la coordenada a* e índice de pardeamiento para los frutos recubiertos. La actividad enzimática de la polifenoloxidasa se mostró decreciente con los días de poscosecha para todos los tratamientos, siendo menor para la mezcla de antioxidantes en un 27% con respecto al control. Se pudo concluir que el recubrimiento que contenía la mezcla de agentes antioxidantes presentó mejor efecto como alternativa de conservación para los frutos y prolongó el tiempo de vida útil del plátano hartón.

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