蚁群-遗传算法优化近红外光谱检测花茶花青素 含量的研究

目的：花青素是鲜花花草茶中起主要保健作用的成分,本研究提出一种基于蚁群-遗传区间偏最小二乘法(ACO-GA-iPLS)的近红外谱区筛选方法,并将其用于花茶花青素含量的预测。方法：将蚁群算法(Ant Colony Optimization, ACO)和遗传算法(Genetic Algorithm, GA)相结合优选特征光谱区间,然后用区间偏最小二乘法算法(iPLS)建立光谱模型。首先对花茶近红外光谱进行预处理；然后用ACO-iPLS优选出特征子区间；最后对所选的特征子区间,用GA-iPLS进一步细化花青素的特征子区间,并建立花青素的预测模型。结果：优选出3个特征子区间(第1、9、10子区间),所建模型对应的交互验证均方根误差(RMSECV)和预测均方根误差(RMSEP)分别为0.1460mg/g和0.1840mg/g,校正集和预测集相关系数分别为0.9187和0.8856。结论： ACO-GA-iPLS可以有效选择近红外光谱特征波长,简化模型,提高模型精度。

Application of ACO-iPLS and GA-iPLS for wavelength selection in NIR spectroscopy

Objective In order to improve the prediction accuracy of quantitative analysis model of NIR spectroscopy, this study proposed a method to select the optimal spectra intervals from the whole NIR spec-troscopy, and predict the anthocyanin content of scented tea. Methods Raw NIR spectra of scented tea samples were preprocessed by SNV, then wavelength regions were selected by ant colony optimization (ACO) algorithm. Finally, the genetic algorithm-interval partial least squares was used to refine the wavelength regions selected by ACO, and predict the anthocyanin content of scented tea. Results The scented tea spectra were divided into 12 intervals, among which 3 subsets, i.e. No. 1, 9, 10 were selected by ACO-iPLS. Then, the selected wavelength regions set were divided into 12 intervals and selected by GA-iPLS. The optimal iPLS model was built with the RMSECV and RMSEP were 0.1460 mg/g and 0.1840 mg/g, and the calibration and prediction correlation coefficient were 0.9187 and 0.8856, respectively. Conclusion The ACO-GA-iPLS can effectively select wavelength regions from near infrared spectroscopy, simplify model complexity and improve accurately of model.