Uptake kinetics and absorption of calcium in apple matrices

SALVATORI, DANIELA; GONZÁLEZ-FESLER, MILENA; WEISSTAUB, ADRIANA; PORTELA, MARÍA LUZ; ALZAMORA, STELLA MARIS

Food Science And Technology International

Sage Publications

Lugar: Los Angeles, London, New Delhi y Singapore; Año: 2007 vol. 13 p. 333 - 340

1082-0132

The purpose of this paper was to study the kinetics of calcium fortification of blanched and not blanched apple tissue during impregnation treatments under vacuum or/and at atmospheric pressure. The relative absorption of calcium in rats, regarding calcium carbonate as reference substance, was also analyzed as a first approach. Apple impregnation was conducted (with and without previous blanching in saturated vapor) in isotonic glucose aqueous solutions containing calcium salts. A 50 mmHg vacuum pressure was applied for a time t1 (0-15, 180 min) or atmospheric pressure was used for a process time t2 (0-7.5 h). Calcium uptake by apple tissue was influenced by system pressure, blanching and impregnation time, reaching 500 to 4600 mg g-1 according to process variables. Preliminary data of true calcium absorption ranged between 74 % and 86 % regarding calcium carbonate.