| 离子液体吸附剂对木犀草素的富集及CARS变量筛选的近红外光谱分析方法 |
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| 基金项目:国家自然科学基金项目(21765012) |
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| 中文摘要:该文以咪唑型离子液体作为原料制备吸附剂富集稀溶液中的木犀草素，利用竞争性自适应权重(CARS)变量筛选的方法建立了一种快速测定木犀草素的近红外光谱分析方法。考察了吸附剂用量、pH值、振荡时间对吸附效果的影响，并探究了吸附剂的吸附能力；富集木犀草素的吸附剂经近红外漫反射光谱检测，采用CARS变量筛选的方法结合偏最小二乘回归(PLS)建立了木犀草素的定量校正模型。结果表明，吸附剂用量为0.15 g、pH值为7、振荡时间为20 min的最佳条件下，吸附率达90.9%，且该吸附符合Langmuir等温吸附模型，最大吸附量为7.1 mg/g。近红外光谱建模中，与未经CARS变量筛选处理作为对照，对比发现经CARS变量筛选的方法结果更优，并采用连续小波变换(CWT)的光谱预处理进行验证，结果表明经CWT处理后，预测残差(RPD)值增大，说明了模型的可靠性。该方法可有效富集稀溶液中的木犀草素，采用CARS变量筛选结合CWT光谱预处理的近红外光谱方法可实现对稀溶液中木犀草素的灵敏、快捷检测。 |
| 中文关键词:咪唑型离子液体吸附剂 木犀草素 近红外光谱 富集 CARS变量筛选 偏最小二乘回归 |
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| Rapid Determination of Luteolin by a Near infrared Spectroscopic Method with Ionic Liquid Adsorbent Enrichment and CARS Variable Screening |
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| Abstract:A near-infrared spectroscopic(NIRS) method using competitive adaptive reweighted sampling(CARS) for variable screening was established for the rapid determination of luteolin,with imidazole ionic liquid as adsorbent enriching luteolin in dilute solution.Effects of amount of adsorbent,pH value and oscillation time on the adsorption efficiency were investigated,and the adsorption capacity of the adsorbent was explored.The adsorbent enriching luteolin was detected by near infrared diffuse reflectance spectroscopy,and a quantitative correction model for luteolin was constructed by CARS method for variable screening combined with partial least squares regression(PLS).Results showed that,under the optimal conditions of 0.15 g of adsorbent,pH 7,and 20 min of oscillation time,the adsorption rate reached to 90.9%,and the adsorption conformed to the Langmuir isotherm adsorption model,with a maximum adsorption capacity of 7.1 mg/g.In the NIRS modeling,the developed model was compared with that of the non CARS variable screening process,and the comparison showed that the results of the CARS variable screening method were better,which were also confirmed by the continuous wavelet transform(CWT) spectral preprocessing.The results exhibited that,the RPD value increased after CWT treatment,which further explain the reliability of the model.This method could be used for effective enrichment of luteolin in dilute solution,and the NIRS method combined with CWT spectrum pretreatment using CARS variable screening could realize the sensitive and rapid detection of luteolin in dilute solution. |
| Key Words:imidazole ionic liquid adsorbent luteolin near infrared spectroscopy enrichment CARS variable screening partial least squares |
| 引用本文：贺小刚，阿迪拉·阿布都热西提，库尔班江·努尔麦提，努尔比耶·阿卜杜瓦柯，韩想，冯昱龙，楚刚辉.离子液体吸附剂对木犀草素的富集及CARS变量筛选的近红外光谱分析方法[J].分析测试学报,2020,39(11):1404-1410. |
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