Barreiro Elorza, Pilar and Ruiz Cabello Osuna, Jesus Maria and Fernandez Valle, M. Encarnacion and Ortiz, Christopher and Ruiz-Altisent, Margarita (1999). Mealiness assessment in apples using MRI techniques. "Magnetic Resonance Imaging", v. 17 (n. 2); pp. pp. 275-281. ISSN 0730-725X.Ver estadisticas de descargas para este eprint (solo desde ordenadores de la UPM)
|Title:||Mealiness assessment in apples using MRI techniques|
|Journal/Publication Title:||Magnetic Resonance Imaging|
|Faculty:||E.T.S.I. Agrónomos (UPM)|
|Creative Commons Licenses:||Recognition - No derivative works - Non commercial|
Full text available as:
771Kb - Idioma: English
Small samples of Top Red apples stored 6 months under controlled atmosphere (expected to be non-mealy) and 2°C (expected to be mealy) have been used for MRI imaging. Multi-slice-multi-echo magnetic resonance images (64*64 pixels) have been recorded with a 8 ms echo time. Three out of four apples corresponding to the sample maintained under controlled atmosphere did not developed mealiness while three out of four fruits corresponding to the sample stored at 2°C became mealy after 6 months of storage. The minimum T2 values obtained for the mealy apples show to be significantly lower (F = 13.21) when compared with non-mealy apples pointing that a more desegregated structure and a lower juiciness content leads to lower T2 signal. Also, there is a significant linear correlation (r = −0.76) between the number of pixels with a T2 value below 35 ms within a fruit image and the deformation parameter registered during the Magness–Taylor firmness test. Finally, all T2 maps of mealy apples show a regional variation of contrast which is not shown for non-mealy apples. Significant differences (F = 19.43) between mealy and non-mealy apples are found in the histograms of the T2 maps as mealy apples show a skew histogram combined with a “tail” in their high T2 extreme which is not shown in the histograms of non-mealy apples. These histogram features are also shown for an apple showing internal breakdown indicating that in mealy apples there is a differential water movement that may precede internal breakdown.
|Freetext Keywords:||Apple; Mealiness; Internal breakdown|
|Deposited by:||Memoria Investigacion|
|Deposited on:||24 Feb 2011 10:30|
|Last Modified:||20 Mar 2012 10:09|
Staff only: Edit this record.