Four nuclear magnetic resonance relaxation protocols are investigated as potential candidates for off-line and on-line determination of avocado maturity. Two-dimensional T-1-T-2 and T-2-D correlation spectroscopy provides the most information but is only suitable for off-line quality control. The CPMG T-2 spectrum gives avocado oil content but requires intensive data processing. Suppression of the tissue water signal by T-1-Null methods is shown to be unreliable but a new, single-shot pulse sequence which uses diffusive attenuation to suppress the tissue water is shown to give a good correlation with oil content and is suitable for both off-line and on-line implementation.
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