Feasibility of diode-array instruments to carry near-infrared spectroscopy from laboratory to feed process control.
Feasibility of diode-array instruments to carry near-infrared spectroscopy from laboratory to feed process control.
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DOI：
10.1021/jf073534t
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发表时间：
2008-04
影响因子：
6.1
通讯作者：
E. Fernández-Ahumada;A. Garrido-Varo;J. Guerrero-Ginel
中科院分区：
文献类型：
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作者：
E. Fernández-Ahumada;A. Garrido-Varo;J. Guerrero-Ginel
建立了近红外校准方法，用于对完整配合饲料的化学成分进行瞬时预测。比较了两种不同的仪器（二极管阵列与光栅单色仪）。光栅单色仪在实验室中以静态模式使用，而更适合在线分析的二极管阵列仪器则放置在传送带上以模拟饲料厂的测量。利用两台仪器分析的同一组样品，建立了修正的偏最小二乘方程。样品集1 （N = 398）用于预测粗蛋白质（CP）和粗纤维（CF），样品集2 （N = 393）用于预测一种宏量成分（向日葵粕，SFM）和一种微量成分（矿物质-维生素预混料，MVP）。单色仪的交叉验证标准误差（SECV）和决定系数（R2）值较好。然而，使用二极管阵列仪器分析的样品获得的CP、SFM和MVP的结果与使用光栅单色仪分析的样品获得的结果相似甚至更高。优良的预测能力[R2> 0.95；从CP、CF和SFM中获得的RPD（标准偏差与SECV之比）为在线使用近红外二极管阵列仪器在复合饲料的制造、加工和销售过程中进行监测和监控开辟了道路。两种仪器的MVP的R2、RPD和SECV值显示出相似的性能。虽然RPD值没有达到定量分析建议的最低值，但对于饲料化合物中如此低含量的一种成分，结果令人鼓舞。
Near-infrared calibrations were developed for the instantaneous prediction of the chemical and ingredient composition of intact compound feeds. Two rather different instruments were compared (diode array vs grating monochromator). The grating monochromator was used in a static mode in the laboratory, whereas the diode-array instrumentbetter adapted to online analysiswas placed on a conveyor belt to simulate measurements at a feed mill plant. Modified partial least squares (MPLS) equations were developed using the same set of samples analyzed in the two instruments. Sample set 1 ( N = 398) was used to predict crude protein (CP) and crude fiber (CF), while sample set 2 ( N = 393) was used for the prediction of one macroingredient (sunflower meal, SFM) and one microingredient (mineral-vitamin premix, MVP). The standard error of cross-validation (SECV) and the coefficient of determination (R2) values for CF were better using the monochromator instrument. However, results obtained for CP, SFM, and MVP using the samples analyzed in the diode-array instrument showed similar or even greater accuracy than those obtained using samples analyzed in the grating monochromator. The excellent predictive ability [R2> 0.95; RPD (ratio of standard deviation to SECV) > 3] obtained for CP, CF, and SFM opens the way for the online use of NIRS diode-array instruments for surveillance and monitoring in the manufacture, processing, and marketing of compound feeds. R2, RPD, and SECV values for MVP showed similar performance for both instruments. Although RPD values did not reach the minimum recommended for quantitative analysis, results are encouraging for an ingredient present in feed compounds in such very low amounts.