近红外光谱法快速测定广藿香中水分含量

Rapid Determination of Moisture Content in Pogostemon cablin by Near-Infrared Spectroscopy

目的建立广藿香中水分含量的近红外定量模型,快速测定广藿香中水分含量。方法用减压干燥法测定142批广藿香水分含量,采集并用多元散射校正法、一阶导数法预处理近红外光谱,结合偏最小二乘法建立广藿香中水分含量的定量模型。结果所建立的校正模型,内部交叉验证决定系数达到0.968 67,校正均方差为0.241,预测均方差为0.308,内部交叉验证均方差为0.430。结论该近红外定量模型稳定,准确可靠,可快速对广藿香中水分含量进行测定。

Objective To establish a method for quantitative determination of the moisture content in Pogostemon cablin（Blanco） Benth by near-infrared spectroscopy and make a rapid test.Methods Moisture contents of 142 samples were determined by a vacuumc drying method.The quantitative detest model for moisture content in Pogostemon cablin（Blanco） Benth was established by using multiplicative signal correction（MSC）,near-infrared spectroscopy pretreated with first-derivative and partial least squares method.Results The internal cross-validation determination coefficient was 0.968 67,with corrected mean-square error as 0.241,predicted mean-square deviation as 0.308,and internal cross-validation mean square error as 0.430 in the created calibration model.Conclusion This quantitative model by near-infrared spectroscopy is steady,accurate and reliable,which can be applied to rapid determination of moisture content in Pogostemon cablin（Blanco） Benth.