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In vivo near-infrared spectroscopy of rat skin tissue with varying blood glucose levels

机译:在具有不同血糖水平的大鼠皮肤组织的近红外光谱中

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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:在葡萄糖夹实验期间,我们在4000-5000cm〜(-1)光谱范围(2.0-2.5μm波长)中的近红外大鼠皮肤吸收的体内测量。这项工作的目标是识别葡萄糖特异性光谱信息的存在,以评估非侵入性的经皮葡萄糖仪器的要求。使用与光纤接口耦合的FTIR光谱仪收集皮肤光谱。在实验中,允许动物在血糖水平下稳定三小时,同时使用从动脉导管中取出的样品监测血糖值。然后通过静脉输注葡萄糖的血糖水平以高于30mm,并保持2小时,然后使其恢复正常。在程序期间连续地记录光谱,并分析以识别由于葡萄糖变化引起的变化。由于葡萄糖浓度的增加而导致的吸光度变化与其他变化(例如皮肤样品的厚度)相比,由于其他变化(例如,皮肤样品的厚度),因此来自高血糖和神经血糖阶段的吸光光谱的简单减法不是有效的。相反,从葡萄糖浓度是恒定的,确定一组主成分。然后,我们在与这些主要成分正交的高血糖期间检查吸光度的变化。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的相似性,这表明存在葡萄糖光谱信息。

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