首页> 外文会议>Conference on Optical Diagnostics and Sensing IV; 20040127; San Jose,CA; US >In vivo near-infrared spectroscopy of rat skin tissue with varying blood glucose levels
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In vivo near-infrared spectroscopy of rat skin tissue with varying blood glucose levels

机译:血糖水平变化的大鼠皮肤组织的体内近红外光谱

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We have performed in vivo measurements of near-infrared rat skin absorption in the 4000-5000 cm~(-1) spectral range (2.0-2.5 μm wavelength) during a glucose clamp experiment. The goal of this work is to identify the presence of glucose-specific spectral information in order to evaluate the requirements for a noninvasive transcutaneous glucose instrument. Skin spectra are collected using an FTIR spectrometer coupled with a fiber-optic interface. In the experiment, an animal is allowed to stabilize at a euglycemic level for three hours while blood glucose values are monitored using samples taken from an arterial catheter. The blood glucose level is then increased above 30 mM by venous infusion of glucose and held for two hours, after which it is allowed to return to normal. Spectra are recorded continuously during the procedure and are analyzed to identify changes due to the glucose variations. Because the change in absorbance due to an increase in glucose concentration is small compared to changes due to other variations (e.g., the thickness of the skin sample), a simple subtraction of absorbance spectra from the hyperglycemic and euglycemic phases is not instructive. Instead, a set of principal components is determined from the euglycemic period where the glucose concentration is constant. We then examine the change in absorbance during the hyperglycemic period that is orthogonal to these principal components. We find that there are significant similarities between these orthogonal variations and the net analyte signal of glucose, which suggests that glucose spectral information is present.
机译:在葡萄糖钳制实验期间,我们已经在4000-5000 cm〜(-1)光谱范围(2.0-2.5μm波长)内进行了近红外大鼠皮肤吸收的体内测量。这项工作的目的是确定葡萄糖特异性光谱信息的存在,以评估对非侵入性经皮葡萄糖器械的要求。使用结合了光纤接口的FTIR光谱仪收集皮肤光谱。在实验中,允许动物在正常血糖水平下稳定3小时,同时使用从动脉导管中采集的样本监测血糖值。然后通过静脉输注葡萄糖将血糖水平提高至30 mM以上,并保持两个小时,然后使其恢复正常。在操作过程中连续记录光谱,并进行分析以识别由于葡萄糖变化而引起的变化。由于与其他变化(例如皮肤样品的厚度)引起的变化相比,由于葡萄糖浓度增加引起的吸光度变化很小,因此简单地从高血糖和正常血糖相中减去吸收光谱是没有启发性的。相反,从血糖浓度恒定的正常血糖期确定一组主要成分。然后,我们检查与这些主要成分正交的高血糖期间吸光度的变化。我们发现这些正交变化与葡萄糖的净分析物信号之间存在显着相似性,这表明存在葡萄糖光谱信息。

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