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花生自然风干种子维生素E含量近红外分析模型构建

2018-08-14刘婷王传堂唐月异胡东青王秀贞吴琪孙全喜王志伟宋国生石程仁殷冬梅

山东农业科学 2018年6期

刘婷 王传堂 唐月异 胡东青 王秀贞 吴琪 孙全喜 王志伟 宋国生 石程仁 殷冬梅

摘要:采集42份自然风干花生种子近红外光谱,并进行维生素E含量的反相高效液相色谱(RP-HPLC)测定,利用偏最小二乘法(Modified PLS)构建了多粒自然风干花生种子维生素E含量的近红外定量分析模型。经优化及内部交叉检验,确定最佳光谱预处理方法为“一阶导数+多元散射矫正”,维生素E含量谱区范围为6 094.3~7 506.0、4 242.8~5 454.0 cm-1,维数为8,模型的决定系数(R2)为88.34,交叉检验根均方差(RMSECV)为0.423。利用该模型对6份花生野生种样品的维生素E含量进行预测,t测验结果显示预测值与真实值间差异不显著。可见,所建近红外光谱模型可以很好地预测自然风干花生种子中维生素E的含量。

关键词:花生;自然风干种子;维生素E含量;近红外定量分析

中图分类号:S565.201文献标识号:A文章编号:1001-4942(2018)06-0163-04

Abstract To build a near infrared spectroscopy (NIRS) model for predicting vitamin E content in sun-dried peanut seeds, spectral data of 42 peanut seed samples were collected and the vitamin E content of each sample was determined by reverse phase high performance liquid chromatography (RP-HPLC). Then a NIR calibration model for vitamin E content was established by partial least squares method (modified PLS). Through optimizing and internal cross validation, the optimal spectrum pretreatment method was the first derivative plus multiplicative scattering correction. The spectrum range, rank, determination coefficient (R2) and root-mean-squares error of cross-validation (RMSECV) for vitamin E were 6 094.3~7 506.0 cm-1 and 4 242.8~5 454.0 cm-1, 8, 88.34 and 0.423, respectively. The model was used to predict the vitamin E content of 6 samples of wild peanut species, and the t test results showed that the difference between the predicted value and true value was not significant. Therefore, the constructed near-infrared spectroscopy model could predict the content of vitamin E in sun-dried peanut seeds very well.

Keywords Peanut; Sun-dried seed; Vitamin E content; Near infrared spectroscopy (NIRS)

花生是世界上主要的經济作物,是优质食用植物油和高消化率蛋白质的重要来源[1]。花生中含有比较丰富的维生素E[2,3]。维生素E是一种天然的抗氧化剂,是机体重要的脂溶性维生素,具有增强免疫力、延缓衰老、降低心血管疾病和癌症发病率的功效[4,5]。维生素E的传统测定方法包括荧光光谱法、高效液相色谱法、蔽塞法、气相色谱法等,成本高、费时间、有一定破坏性。花生高维生素E育种迄今未能开展,原因就在于缺乏成本低廉、速度快、稳定可靠的选择鉴定技术。

近红外检测技术具有成本低、无损、速度快等优点,已在棉籽、油菜、玉米、大豆、芝麻等多种农作物的品质分析中应用[6-13],在花生上也已成功建立了能准确预测脂肪酸、脂肪、蛋白、水分、蔗糖等含量的近红外模型[14-18],但有关花生维生素E含量预测的近红外模型迄今未见报道。……

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