Measurement of moisture transformation and distribution inrnTricholoma matsutake by low field nuclear magnetic resonancernduring the hot-air drying process

摘要

This study aims at measuring the moisture transformation and distribution of Tricholoma matsutakern(T. matsutake) during the hot-air drying process, to provide theoretical guidance for drying optimizationrnof T. matsutake. Pileus and stipe of T. matsutake were dried at 55 8C for 14 hr. During thernhot-air drying, spin-spin relaxation measurements and magnetic resonance image were used torndetermine the water composition and the moisture transformation, respectively. Results showedrnthat three categories of moisture including free, immobilized, and bound water were presented inrnT. matsutake. During the drying process, the immobilized water was the major, free and immobilizedrnwater were active, while bound water was stable. The measurements of moisturerntransformation and distribution in T. matsutake by low field nuclear magnetic resonance suggestedrnthat hot-air drying was an inhomogeneous drying process.