An NMR study on internal browning in pears

Hernández Sánchez, Natalia; Hills, B.P.; Barreiro Elorza, Pilar y Marigheto, N. (2007). An NMR study on internal browning in pears. "Postharvest Biology and Technology", v. 44 (n. 3); pp. 260-270. ISSN 0925-5214. https://doi.org/10.1016/j.postharvbio.2007.01.002.

Descripción

Título: An NMR study on internal browning in pears
Autor/es:
  • Hernández Sánchez, Natalia
  • Hills, B.P.
  • Barreiro Elorza, Pilar
  • Marigheto, N.
Tipo de Documento: Artículo
Título de Revista/Publicación: Postharvest Biology and Technology
Fecha: Junio 2007
Volumen: 44
Materias:
Escuela: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Departamento: Ingeniería Rural [hasta 2014]
Grupo Investigación UPM: LPF-TAGRALIA
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

Internal browning in pears (Pyrus communis L. cv. Blanquilla) has been studied by NMR and MRI in order to develop a non-destructive procedure for on-line disorder identification. For NMR relaxometry, disordered tissue shows higher transverse relaxation rates compared to sound tissue, especially at higher magnetic field strength and for long pulse spacing. Membrane alteration and therefore tissue disintegration, as well as water evaporation, appear to be the main causes of this response. Correlation between relaxation times and diffusion showed that the proton pools in disordered tissue are grouped into a smaller number of populations compared to sound tissue, also highlighting cell decompartmentation in disordered tissue. At a macroscopic level, fast low angle shot MR images, effective transverse relaxation-weighted (TR 11 ms and TE 3.7 ms) and proton density-weighted (TR 7.6 ms and TE 2.5 ms), were acquired for pears at a rate of 54 mm/s. Images have been discriminated for internal breakdown according to histogram characteristics. Up to 94 and 96% of pears, respectively, were correctly classified in the former and the latter type of images. In this study a minimum value of 12% of tissue affected by breakdown was always clearly identified

Más información

ID de Registro: 5012
Identificador DC: http://oa.upm.es/5012/
Identificador OAI: oai:oa.upm.es:5012
Identificador DOI: 10.1016/j.postharvbio.2007.01.002
URL Oficial: http://www.sciencedirect.com/science/journal/09255214
Depositado por: Memoria Investigacion
Depositado el: 18 Nov 2010 09:28
Ultima Modificación: 20 Abr 2016 14:00
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