Rapid Determination of Moisture Content in Rhizoma Heterosmilacis Japonicae and Radix Sophorae Flavescentis with Near-infrared Diffused Reflection Spectroscopy

Objective:To develop a rapid NIR method for determination of moisture content in Rhizoma Heterosmilacis Japonicae and Radix Sophorae Flavescentis.Method:The NIR spectra of the sample powders were measured in a diffused reflection mode.The correlation models between the NIR spectra and the reference values of moisture content in two herbs were obtained with partial least squares method and optimized through inner cross validation and external validation.Result:The determination coefficients of inner cross validation of the two models were both above 0.97 and the RMSECV were both below 0.001 9.The determination coefficients of external validation of the two models were both above 0.99 and the RMSEP were both below 0.002 2.Conclusion:The presented method is timesaving,convenient and accuracy,which could be applied for the rapid detection of the moisture content in the raw medicinal materials.