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An NMR method was developed for detection of the sublimation period endpoint during the freeze‐drying of potato pieces. Longitudinal (T 1 and transverse (T 2 ) relaxation times were estimated using rapid NMR methods. Samples were immediately examined to determine presence of a frozen core. The plot of T 1 vs T 2 showed an abrupt increase at a point corresponding to the complete elimination of the frozen core. Similar Tj vs T 2 curves were observed when monitoring freeze‐drying of a single potato piece inside the NMR probe‐head. The detection of an anomalous freeze‐drying is possible by monitoring the T 1 the T 2 or the free induction decay signal.
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Marques et al. (1991) studied this question.
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