Moisture and oil content measurements of red pepper powder using 10-MHz pulsed NMR
2001
Cho, S.I. | Chung, C.H.
Nondestructive measurement of moisture content (MC) and oil content (OC) is crucial for on-line processing of red pepper powder. A 10-MHz pulsed 1H NMR system (NMS110), 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 of 0.60% 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 r2 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.
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