An NMR study on internal browning in pears

Hernández Sánchez, Natalia and Hills, B.P. and Barreiro Elorza, Pilar and 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.


Title: An NMR study on internal browning in pears
  • Hernández Sánchez, Natalia
  • Hills, B.P.
  • Barreiro Elorza, Pilar
  • Marigheto, N.
Item Type: Article
Título de Revista/Publicación: Postharvest Biology and Technology
Date: June 2007
ISSN: 0925-5214
Volume: 44
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Ingeniería Rural [hasta 2014]
UPM's Research Group: LPF-TAGRALIA
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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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

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Item ID: 5012
DC Identifier:
OAI Identifier:
DOI: 10.1016/j.postharvbio.2007.01.002
Official URL:
Deposited by: Memoria Investigacion
Deposited on: 18 Nov 2010 09:28
Last Modified: 20 Apr 2016 14:00
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