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Effects of temperature on near-infrared spectroscopic measurement of glucose
xiii, 84 leaves : illustrations ; 28 cm.
40.4 'C range on Fourier filtered and unfiltered single-beam
absorbance spectra, with the reference taken at the same
absorbance units, including three glucose absorption peaks)
absorption bands were shown to shift to longer wavelengths
an increase in SEP as large temperature differences were
and 2.326 um) are temperature insensitive.'O," The water
as well as absorbance NIR spectra (2.0-2.5 Jim) of glucose
bands centered at 1.923 and 2.623 um depend heavily on
case. When absorbance spectra were used with the reference
constructed at five different temperatures. The SEP values
decreased with decreasing temperature. A simple linear
difference between the filtered spectra and unfiltered
filtered single-beam spectra reduced the SEP but still showed
generally lower than the filtered single-beam spectra in each
glucose concentration showed high linearity across the
glucose in diabetic patients. The focus of this research was
glucose using near-infrared (NIR) spectroscopy would be
impact on the absorbance spectra, providing no significant
in the calibration model built with unfiltered glucose
in the food industry, and in vivo monitoring for control of
models with glucose single-beam and absorbance spectra were
nutrients in cell culture media, monitoring on-line processes
produced. When either filtered or unfiltered glucose
regression model for absorbance at 2.273 um as a function of
scans taken at the same temperature as the sample scans,
single-beam spectra decreased, providing a trend across the
solution. It is known that the positions of water absorption
spectra and in some cases, an increase in the SEP.
standard errors of prediction (SEP) for the validation data
temperature effects while the glucose bands (-2.105, 2.237,
temperature range, as the sample temperature approaches the
temperature range. Partial least squares (PLS) calibration
temperature used for the calibration set. The use of Fourier
temperature, were used with PLS regression, the SEP was
the investigation of the temperature effects across a 10.6 to
The noninvasive monitoring of sugars and, in particular,
there was no significant difference and no pattern in the
useful for a number of applications including regulating the
while the bandwidth (the distance between two bands at 1.5
with temperature. The filtering technique had a minimal
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Includes bibliographical references: pages 74-75.