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Artículo

Combined effect of ultrasound, mild heat shock and citric acid to retain greenness, nutritional and microbiological quality of minimally processed broccoli (Brassica oleracea L.): An optimization study

Ansorena, Maria RobertaIcon ; Moreira, Maria del RosarioIcon ; Roura, Sara InesIcon
Fecha de publicación: 03/2014
Editorial: Elsevier Science
Revista: Postharvest Biology and Technology
ISSN: 0925-5214
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Alimentos y Bebidas

Resumen

Response surface methodology (RSM) and Box–Behnken design were used to study the combined hurdle effect of mild heat time (1–5 min) at 50 °C, ultrasonic processing time (0–10 min) and citric acid concentration (0–2%) on the quality of refrigerated broccoli after 10 d of storage at 5 °C. Treatment effects were evaluated on weight loss, superficial colour (hue angle (H°) and total colour difference (ΔE)), headspace gas composition (O2 and CO2), overall browning potential, chlorophyll content, ascorbic acid content, mesophilic counts and overall visual quality (OVQ) and optimize the process by means of the desirability function. Predicted models were found to be significant with high regression coefficients (91–97%). High regression coefficients indicated that second-order polynomial models could be used to predict and optimize the quality retention in minimally processed broccoli during storage. The mesophilic counts, ascorbic acid content and the overall visual quality were significantly influenced by the three independent variables either independently or interactively. Both thermal and ultrasonic treatments were found to be critical factors influencing changes in chlorophyll content, O2 concentration inside the package, hue angle and ΔE. On the other hand, thermal treatment and citric acid concentration were found to be significant on overall browning potential. By using the desirability function approach and considering superficial colour parameters, O2 concentration, mesophilic counts, browning potential, ascorbic acid and chlorophyll content, the optimum processing conditions were 7.5 min of ultrasonic treatment, 3 min of a heat shock treatment and a citric acid concentration of 1.5%. These results were in good agreement with the maximum found from the canonical analysis performed from the response surface when only considering sensorial analysis. Under these optimal processing conditions it is possible to employ citric acid treatment in combination with ultrasonic and thermal treatments as hurdles for retention of green colour, nutritional quality, microbial control and for extending shelf life of refrigerated minimally processed broccoli.
Palabras clave: Hurdle Technology , Response Surface Methodology , Optimization , Desirability Function , Postharvest
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/34666
DOI: http://dx.doi.org/10.1016/j.postharvbio.2014.02.017
URL: https://www.sciencedirect.com/science/article/pii/S0925521414000817
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Articulos(CCT - MAR DEL PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MAR DEL PLATA
Citación
Ansorena, Maria Roberta; Moreira, Maria del Rosario; Roura, Sara Ines; Combined effect of ultrasound, mild heat shock and citric acid to retain greenness, nutritional and microbiological quality of minimally processed broccoli (Brassica oleracea L.): An optimization study; Elsevier Science; Postharvest Biology and Technology; 94; 3-2014; 1-13
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