【摘要】：對羥基苯甲酸甲酯鈉是一種常見的食品添加劑,如果長時(shí)間食用或者超量食用會(huì)對人體造成一定的危害。采用FS920熒光光譜儀對對羥基苯甲酸甲酯鈉橙汁溶液和水溶液進(jìn)行檢測,實(shí)驗(yàn)結(jié)果表明兩者的特征峰發(fā)生了明顯的變化。經(jīng)分析得出,對羥基苯甲酸甲酯鈉橙汁溶液的熒光光譜受到橙汁熒光特性干擾,一定濃度范圍的溶液光譜圖存在較大差距,對羥基苯甲酸甲酯鈉濃度與熒光強(qiáng)度之間的關(guān)系復(fù)雜。為了精確地檢測橙汁中對羥基苯甲酸甲酯鈉的濃度,結(jié)合熒光光譜法與最小二乘支持向量機(jī),建立了橙汁溶液中對羥基苯甲酸甲酯鈉的檢測模型,使用改進(jìn)的粒子群優(yōu)化算法得到影響模型性能的正則化參數(shù)和核函數(shù)。實(shí)驗(yàn)得到了較為理想的結(jié)果,與普通反向傳播(BP)神經(jīng)網(wǎng)絡(luò)、基本粒子群尋參的最小二乘支持向量機(jī)等方法相比,該方法性能最優(yōu),得到的平均回收率為97.05%,平均相對誤差為2.71%,均方根誤差為3.04%,模型輸出與真實(shí)值之間的相關(guān)系數(shù)是0.9999。該方案可以做為橙汁中對羥基苯甲酸甲酯鈉濃度的精確檢測方法。
[Abstract]:Sodium p-hydroxybenzoate is a common food additive, if eaten for a long time or excessive consumption will cause certain harm to the human body. FS920 fluorescence spectrometer was used to detect the orange juice solution and aqueous solution of sodium p-hydroxybenzoate. The experimental results show that the characteristic peaks of the two solutions have changed obviously. The results show that the fluorescence spectrum of sodium p-hydroxybenzoate orange juice solution is interfered by the fluorescence characteristics of orange juice, and there is a big gap in the solution spectrum in a certain concentration range. The relationship between the concentration of sodium p-hydroxybenzoate and fluorescence intensity is complex. In order to accurately detect the concentration of sodium p-hydroxybenzoate in orange juice, a model for the determination of sodium p-hydroxybenzoate in orange juice solution was established by combining fluorescence spectroscopy and least square support vector machine. The regularization parameters and kernel functions that affect the performance of the model are obtained by using the improved particle swarm optimization algorithm. The experimental results are satisfactory. Compared with the ordinary back propagation (BP) neural network and the least square support vector machine for basic particle swarm optimization, this method has the best performance, and the average recovery is 97.05%. The average relative error is 2.71%, the root mean square error is 3.04%, and the correlation coefficient between the output of the model and the true value is 0.999 9. This method can be used as an accurate method for the determination of sodium p-hydroxybenzoate in orange juice.
【作者單位】： 燕山大學(xué)電氣工程學(xué)院;
【基金】：國家自然科學(xué)基金(61471312) 河北省自然科學(xué)基金(F2015203240)
【分類號(hào)】：TP18;TS207.3

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