Moisture and oil content measurements of red pepper powder using 10-MHz pulsed NMR

摘要

Nondestructive measurement of moisture content (MC) and oil content (OC) is crucial for on-line processing of red pepper powder A 10-MHz pulsed H NMR system (NMS11O), free induction decay (FID), and spin-echo pulse techniques were used to measure moisture and oil contents of red pepper powder nondestructively. Prediction models for MC and OC were developed using FID and spin-echo signals. The model for MC using an FID signal had an SEC of 1.05 and an SEP of 0.94. The model for OC using a spin-echo signal had an SEC ofa6o and an SEP of 0.53. A model for simultaneous measurement of MC and OC was developed. To measure MC and OC simultaneously, both FID signal and spin-echo signals were used. After measuring MC, the spin-echo signal was divided by the FID signal. This ratio was used for measuring OC. The r{sup}2 values of validation for MC and OC measurement were 0.98 and 0.95, respectively, and the SEP was 1.09 and 0.85, respectively. The results demonstrated that the low-resolution pulsed NMR system could be used for simultaneous nondestructive MC and OC measurements of red pepper powder