二維相關光譜分析在無創(chuàng)血糖檢測特異性研究中的應用
[Abstract]:The effects of the main components in the blood and the systematic drift during the measurement on the molecular specificity of glucose in the near infrared spectroscopy were investigated by two-dimensional correlation spectroscopy. The near infrared transmission spectra of glucose aqueous solution were measured at first. Using glucose concentration as an external disturbance, the two dimensional correlation synchronous spectra and asynchronous spectra were calculated, and the characteristic absorption peaks of glucose in the frequency-doubling and frequency-doubling regions were determined by comparative analysis. When a small amount of albumin was added to glucose aqueous solution, the first-order frequency doubling absorption peak (1 590nm) and the second order frequency doubling absorption peak (1 195nm) of glucose in the two-dimensional correlation spectrum showed different homology. It was suggested that albumin might destroy the specificity of glucose. The oral glucose tolerance test was carried out and the diffuse reflectance spectra of the palm were measured. The homologous absorption of glucose in the two-dimensional correlation spectrum was also destroyed. In addition, the spectral variation information caused by glucose concentration change is small, which is easy to be masked by system drift, so background correction is usually needed. In the transmission experiment of glucose aqueous solution and the human diffuse reflection experiment, the pure water sample and the 5% standard diffuse reflectance plate were introduced as reference respectively. After background correction of the reference sample, the peak offset caused by the system drift in the 2-D synchronous tangent spectrum is reduced, and the characteristic absorption of glucose is enhanced. Therefore, in NIR non-invasive blood glucose detection, we should avoid the band which is not homologous to the characteristic absorption of glucose, and it is necessary to adopt certain reference measurement methods to improve the specificity of the detection.
【作者單位】: 天津大學精密測試技術及儀器國家重點實驗室;天津大學精密儀器與光電子工程學院;
【基金】:國家自然科學基金項目(60938002) 國家(863)計劃項目(2012AA022602)資助
【分類號】:R587.1;O657.3
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