Egawa Mariko, Fukuhara Tadao, Takahashi Motoji, Ozaki Yukihiro
Shiseido Research Center (Shin-Yokohama), Tsuzuki, Yokohama 224-8558, Japan.
Appl Spectrosc. 2003 Apr;57(4):473-8. doi: 10.1366/00037020360626032.
The water content of human nail plates was determined using a portable near-infrared (NIR) spectrometer with an InGaAs photodiode array detector. NIR diffuse reflectance (DR) spectra were collected from 108 cut nail plates with different relative humidity and in vivo from fingernails. Partial least-squares (PLS) regression was applied to the NIR spectra in the 1115-1645 nm region to develop calibration models that determine the water content in the cut nail plates and fingernails. A good correlation was obtained between the NIR spectra and the water content measured by nuclear magnetic resonance (NMR) for the NIR measurement of both cut nail plates and fingernails. The results indicate that the water content in the nails can be determined very rapidly (1 s) by means of the portable NIR spectrometer and PLS regression.
使用配备铟镓砷光电二极管阵列探测器的便携式近红外（NIR）光谱仪测定人指甲板的含水量。从108个具有不同相对湿度的剪下的指甲板以及活体指甲中收集近红外漫反射（DR）光谱。在1115 - 1645 nm区域将偏最小二乘法（PLS）回归应用于近红外光谱，以建立用于确定剪下的指甲板和指甲中含水量的校准模型。对于剪下的指甲板和指甲的近红外测量，近红外光谱与通过核磁共振（NMR）测量的含水量之间获得了良好的相关性。结果表明，借助便携式近红外光谱仪和PLS回归可以非常快速地（1秒）测定指甲中的含水量。
