磨盘柿褐变指标的可见/近红外漫反射无损预测研究

为了建立可见/近红外漫反射光谱与磨盘柿果皮和果肉褐变之间的关系,作者在全光谱区域(570～1 848 nm)对比分析了不同处理方法对磨盘柿果皮颜色b*和果肉浊度定标模型的影响。结果表明,应用MPLS、原始光谱和无散射处理建立果皮颜色b*的定标模型预测性能较好,Rp2为0.968,RMSEP为1.417 7,RPD为7.92。应用PLS、一阶导处理和无散射处理建立磨盘柿果肉浊度的定标模型预测性能较好,Rp2为0.757,RMSEP为0.107 9,RPD为2.22。因此,可见/近红外漫反射技术对磨盘柿果皮颜色b*和果肉浊度的快速无损检测具有可行性。

Research on Nondestructive Measurement of Browning Indexes of Mopan Persimmon Using Visible and Near Infrared Diffuse Reflection Spectroscopy

In order to establish the relationships of the visible and near infrared diffuse reflection(VIS/NIR) spectroscopy and peel browning and flesh browning of Mopan persimmon,calibration results for peel color b* and flesh turbidity of Mopan persimmon were compared with different treatment methods in the whole spectral region between 570 and 1 848 nm.The results showed that the modified partial least squares(MPLS) model,with respect to original spectra and None treatment,provided better prediction performance for peel color In order to establish the relationships of the visible and near infrared diffuse reflection(VIS/NIR) spectroscopy and peel browning and flesh browning of Mopan persimmon,calibration results for peel color b* and flesh turbidity of Mopan persimmon were compared with different treatment methods in the whole spectral region between 570 and 1 848 nm.The results showed that the modified partial least squares(MPLS) model,with respect to original spectra and None treatment,provided better prediction performance for peel color b * of persimmon,with correlation coefficient of prediction(R p 2) and the root mean square error of prediction(RMSEP),ratio performance deviation(RPD) of 0.968,1.417 7,and 7.92 respectively.And the partial least squares(PLS) model,with respect to the first derivative D1 log(1/R) and None treatment,provided better prediction performance for flesh turbidity of persimmon,with R p 2,RMSEP and RPD of 0.757,0.107 9,and 2.22 respectively.Therefore,nondestructive measurement of peel color b * and flesh turbidity of Mopan persimmon using VIS/NIR spectroscopy technique was feasible.of persimmon,with correlation coefficient of prediction(R p 2) and the root mean square error of prediction(RMSEP),ratio performance deviation(RPD) of 0.968,1.4177,and 7.92 respectively.And the partial least squares(PLS) model,with respect to the first derivative D1 log(1/R) and None treatment,provided better prediction performance for flesh turbidity of persimmon,with R p 2,RMSEP and RPD of 0.757,0.107 9,and 2.22 respectively.The aboved results demonstrated that VIS/NIR spectroscopy technique was feasible to nondestructive determination of peel color b * and flesh turbidity of Mopan persimmon.