Water transverse relaxation times T2 and self-diffusion coefficients D have been measured on banana samples at different ripening stages. Relaxation data have been interpreted on the basis of a chemical and diffusive exchange,model proposed by Belton and Hills [Mol. Phys. 61(4) (1987) 999] and Hills et al. [Mol. Phys. 67(4) (1989) 903]. According to that model the observed increase of T-2 values of both cytoplasmatic and vactiolar water may be mainly attributed to the decrease of starch concentration during the ripening process. On the other hand, the observed water self-diffusion coefficient decrease is related to sugar accumulation as starch hydrolysis proceeds. At the early stages of ripening, the individual self-diffusion coefficient values of cytoplasmatic and vacuolar water differ from one another and have been calculated through the analysis of relaxation time-separated pulsed field gradient nuclear magnetic resonance experiments [J. Magn. Reson. A 112 (1995a) 237]. (C) 2004 Elsevier Ltd. All rights reserved.
Ripening of banana fruit monitored by water relaxation and diffusion H-1-NMR measurements / A., Raffo; Gianferri, Raffaella; R., Barbieri; Brosio, Elvino. - In: FOOD CHEMISTRY. - ISSN 0308-8146. - STAMPA. - 89:1(2005), pp. 149-158. [10.1016/j.foodchem.2004.02.024]
Ripening of banana fruit monitored by water relaxation and diffusion H-1-NMR measurements
GIANFERRI, Raffaella;BROSIO, Elvino
2005
Abstract
Water transverse relaxation times T2 and self-diffusion coefficients D have been measured on banana samples at different ripening stages. Relaxation data have been interpreted on the basis of a chemical and diffusive exchange,model proposed by Belton and Hills [Mol. Phys. 61(4) (1987) 999] and Hills et al. [Mol. Phys. 67(4) (1989) 903]. According to that model the observed increase of T-2 values of both cytoplasmatic and vactiolar water may be mainly attributed to the decrease of starch concentration during the ripening process. On the other hand, the observed water self-diffusion coefficient decrease is related to sugar accumulation as starch hydrolysis proceeds. At the early stages of ripening, the individual self-diffusion coefficient values of cytoplasmatic and vacuolar water differ from one another and have been calculated through the analysis of relaxation time-separated pulsed field gradient nuclear magnetic resonance experiments [J. Magn. Reson. A 112 (1995a) 237]. (C) 2004 Elsevier Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
