Archivos Latinoamericanos de Nutrición (Dec 2006)
Aceptabilidad y calidad nutricional de una bebida a base de zumo de naranja y suero de leche, conservado con calor o campos eléctricos pulsados de alta intensidad Acceptability and nutritional quality of a beverage based on orange juice and whey powder, preserved by heat or high-intensity pulsed electric fields (HIPEF).
Abstract
El zumo de naranja puede ser vehículo de nutrientes para mejorar la calidad de una dieta, pero es preciso que tenga buena aceptabilidad. Los objetivos del presente trabajo fueron: a) estudiar la aceptabilidad de bebidas preparadas a partir de zumo de naranja (Z) con agregado de suero lácteo en polvo (SL) al 7% (Z+SL7) ó al 13% (Z+SL13); b) evaluar el contenido de lisina disponible y la retención de ácido ascórbico, del preparado de mayor aceptación, comparando el efecto del tratamiento de Campos Eléctricos Pulsados De Alta Intensidad (CEPAI) (29 kV/cm, tacum: 59ìs) con un proceso térmico convencional a 75°C, 15 minutos (TT). Las bebidas se sometieron a una evaluación sensorial (test de Friedman). Se determinó lisina disponible por el método de Carpenter modificado por Booth y vitamina C por HPLC; minerales: Na y K, por fotometría de llama; Ca, Mg y Zn por espectrometría de absorción atómica. No hubo diferencias significativas entre la aceptación de Z y Z+SL7. La de Z+SL13 fue significativamente menor (pOrange juice may be a nutrient vehicle that helps to improve diet quality. The addition of whey allows the incorporation of high quality proteins. However, a good acceptability is necessary. The aims of the present study were: a) to assess the acceptability of a beverage prepared with orange juice (J) and whey powder (WP) at 7 g/100 g (J+WP7) or at 13g/100 g (J+WP13); b) to measure available lysine content and ascorbic acid retention of the more accepted formulation, comparing the effect of HIPEF treatment (29 kV/cm, tacum: 59ìs) with a conventional heat treatment at 75°C, for 15 minutes (HT). The beverages were subjected to sensory evaluation (Friedman test). Available lysine was assessed by the Carpenter method, modified by Booth, and vitamin C by HPLC; minerals Na and K, by flame photometry; Ca, Mg and Zn by atomic absorption spectrometry. There were no significant differences between the acceptance of J and J+WP7. J+WP13 was significantly less accepted (p<0.01), so it was discarded. Available lysine (mg/g protein) in untreated J+WP7 was 60.2±0.15; after treatments: 50.0±2.8 (HT) and 51.0±3.4 (HIPEF). The HIPEF treated J and (J+WP7) retained 100% and 98% of their vitamin C initial content and the HT treated, 91% and 88%, respectively. The amount of whey powder added to the orange juice conditioned the acceptability. The juice containing 7% of whey powder was well accepted, and after treatment by HIPEF, it retained a good nutritional quality, regarding available lysine, vitamin C retention and provision of mineral nutrients.
