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As a new sensing technology for rapid nondestructive detection, low field nuclear magnetic resonance technology (LF-NMR) is being widely applied in many fields of food science and technology. The purpose of this study was to evaluate the potential of the LF-NMR technique to detect in the endpoint in drying off carrots as a model food material. Taking relative standard deviation (RSD) as the evaluation index, the research examined the effect of sample quantity and moisture content (MC) on the precision of detection. The results showed that adjusting the number of scans (NS) during drying and sample quantity can help improve the detection performance of LF-NMR. The MC level of 20% was observed to be the key point for adjustment of the detection parameter while the sample quantity at the drying endpoint is recommended to be 1.0-1.5g to achieve good precision. [ABSTRACT FROM AUTHOR]

The present study aimed at investigating the characteristics of monosodium glutamate (MSG) microcapsules. Spray-drying was used to prepare the microcapsules, in which the core material (MSG) was coated with gum Arabic (GA) and maltodextrin (MD), and the weight ratio of MD with GA was 1:2. The characteristics of microcapsules were evaluated by scanning electron microscopy (SEM), moisture content, particle size, Fourier-transform infrared (FTIR), differential scanning calorimeter (DSC), thermogravimetry analysis (TGA), release behavior, the flavor, and taste in hot-pot. Few concave wrinkles were observed on the quasispheres surface of microcapsules coated with GA and MD. The particle size of the microcapsules ranged from 14.00 to 30.00 µm in the mean diameter, and moisture content was 2.08%. An FTIR study indicated a successful packet of MSG by wall materials and the formation of MSG microcapsules during spray drying. Results of DSC and TGA showed that hybrid encapsulation was conducive to the improvement of thermal stability of MSG. In the release of hot-pot study, tests of slow-release, electronic nose, and electronic tongue demonstrated that MSG microcapsules were available in hot water conditions to release. The MSG microcapsules coated with GA and MD exhibited long time for slow-release. Therefore, spraying drying is a suitable approach to manufacture slow-released powdered microcapsules. [ABSTRACT FROM AUTHOR]