Abstract：
:Magnetic resonance imaging (MRI) relies on the topological distribution of the intense water NMR signal and may be used to report about changes in the internal structures of fruits associated to ripening, storing, pathogen infection. Herein the use of CEST-MRI (chemical exchange saturation transfer) is introduced to show that in addition to structural information, insights into the presence in the fruits of specific chemicals may be gained. Asparagine is present in plums at relatively high concentration (≈10-20mM) and owns two amide protons (at 2.1 and 2.8ppm down field from water) in slow exchange with water protons. By irradiating the amide resonances with a proper rf-field it is possible to transfer saturated magnetization to the "bulk" water signal. The attained change in signal intensity reflects the extent of prototropic exchange between amide and water protons that is modulated by the local pH.
journal_name
Food Chemjournal_title
Food chemistryauthors
Podda R,Delli Castelli D,Digilio G,Gullino ML,Aime Sdoi
10.1016/j.foodchem.2014.07.041subject
Has Abstractpub_date
2015-02-15 00:00:00pages
1-4eissn
0308-8146issn
1873-7072pii
S0308-8146(14)01074-7journal_volume
169pub_type
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