In the light of its functional properties found in this study, safflower protein isolate produced by ultrafiltration is recommended for use as an ingredient in food products such as salad dressing, meat products, mayonnaise, cakes, ice cream and desserts.

(2013) Rehydration properties of precooked whole beans (Phaseolusvulgaris) dehydrated at room temperature, CyTA -Journal of Food, 11:1, 94-99, DOI: 10.1080/19476337.2012 To link to this article: https://doi.org/10. 1080/19476337.2012 The aim of this research was to study the rehydration behavior of precooked whole beans (Phaseolus vulgaris) dehydrated at room temperature (258C) and soaked in water at three temperatures (40, 60, and 808C). The water absorption of the beans was determined by the gain in weight. The dehydration kinetic at room temperature of the beans was adequately described by the Logarithmic model (R 2 ¼ 0.9989) with a dehydration rate constant (k d ) value of 1.96 6 10 73 min 71 . A semi-empirical first-order differential equation adequately described the rehydration characteristics of precooked whole bean under the experimental conditions (R 2 ¼ 0.9934-0.9976). The rehydration rate constant (k r ) increased from 6.10 6 10 72 to 12.14 6 10 72 min 71 with an increase in the temperature from 40 to 808C. The temperature dependence of k r was well described by Arrhenius-type equation (R 2 ¼ 0.8785), with estimated activation energy of 16.03 kJ mol 71 K 71.Keywords: precooked whole bean; water absorption; rehydration kinetic; dehydration kinetic El propo´sito de este trabajo fue estudiar el comportamiento de rehidratacio´n de frijol (Phaseolus vulgaris) entero precocido deshidratado a temperatura ambiente (258C) y remojado en agua a tres temperaturas (40, 60 y 808C). La absorcio´n de agua del frijol se determino´por la ganancia de peso. La cine´tica de deshidratacio´n a temperatura ambiente del frijol fue descrita adecuadamente por el modelo Logarı´tmico (R 2 ¼ 0,9986) con un valor de la constante de velocidad de deshidratacio´n (k d ) de 1,96 6 10 73 min 71 . Una ecuacio´n diferencial empı´rica de primer orden describio´adecuadamente las caracterı´sticas de rehidratacio´n del frijol entero precocido bajo las condiciones experimentales (R 2 ¼ 0,9933 a 0,9976). La constante de velocidad de rehidratacio´n (k r ) se incremento´de 6,10 6 10 72 a 12,14 6 10 72 con el aumento de temperatura de 40 a 808C. La dependencia de temperatura de k r fue descrita por la ecuacio´n de Arrhenius (R 2 ¼ 0,8785), con una energı´a de activacio´n estimada de 16,03 kJ mol 71 K

A protein isolate from passion fruit seeds (PFSPI) obtained by alkaline extraction and isoelectric precipitation was treated with sonication for 15 and 30 min at 40 kHz to evaluate its impact on the physicochemical and functional properties. The PFSPI had a purity of 96.21% protein, with albumins being the main fraction (75.66%). Ultrasound increased the bulk density (ρ) of PFSPI by 13.3% and the formation a more porous structure by a greater separation between particles. Protein solubility of PFSPI in the range of pH 2–12 sonicated for 15 and 30 min, increased on average 5.21 and 9.86%, respectively, in comparison with the control. PFSPI foaming properties were influenced by pH and sonication time, achieving up to 577%, while the minimum gelling concentration was reduced from 4 to 2% at pH 7. Therefore, sonication treatment improved some functional properties of PFSPI for its potential use as a food ingredient.

SummaryInstant whole beans obtained by drying at 25 °C were evaluated for their chemical, phy sicochemical, nutritional, microbiological, sensory and rehydration characteristics. The proximal composition of instant whole beans was typical of this kind of food, whereas a w and L*, a* and b* values were 0.639, 98.55, -0.28 and -1.52, respectively. In instant whole beans, 75 % of the essential amino acids had a value greater or equal to the reference standard for adult humans; the protein quality in terms of chemical score was 95 %. Microbiological counts of aerobic mesophilic bacteria, moulds, yeasts and total coliforms of rehydrated instant whole beans were <10 CFU/g, whereas the scores for colour, fl avour, texture and overall acceptability were 7.22, 7.68, 7.24 and 7.34, respectively, on a 1-9 hedonic scale. The logarithmic and Pilosof models showed close fi ts (R 2 >0.99) to the experimental data for drying of cooked beans and rehydration of instant whole beans, respectively. In the light of the chemical, physicochemical, nutritional, microbiological, sensory and rehydration characteristics of instant whole beans found in this study, drying at 25 °C is recommended for the production of such food.