Determination of moisture in single-cell protein utilising photoacoustic spectroscopy in the near-infrared region

Abstract

The determination of moisture in single-cell protein utilising photoacoustic spectroscopy and measurements at 1.9 and 1.55 pm is described. Some control of the particle-size range of samples is found to be necessary and linear calibration graphs are obtained with a relative standard deviation of 0.04 over the moisture range of about 0-12y0 mjnz. The results obtained using photoacoustic spectroscopy are compared with those obtained using a low resolution nuclear magnetic resonance technique.

Analysis of Resistant Starches in Rat Cecal Contents Using Fourier Transform Infrared Photoacoustic Spectroscopy

“…A handful of studies have successfully analyzed starch and other food-based components using FTIR-PAS. One of the first food analyses used IR-PAS with a near-infrared monochromator to determine the moisture content of protein powders . Later researchers applied FTIR-PAS to analyze protein and carbohydrate but lacked statistical power to quantify the data .…”

“…One of the first food analyses used IR-PAS with a near-infrared monochromator to determine the moisture content of protein powders. 24 Later researchers applied FTIR-PAS to analyze protein and carbohydrate but lacked statistical power to quantify the data. 25 It was not until the mid-1990s that FTIR techniques with food materials began to couple spectral results with statistical techniques, such as partial least squares (PLS).…”

The Absorption Behavior of Water and Some Organic Liquids in the Near Infrared Studied by Photoacoustic Spectroscopy

“…The applications are. e.g.. measurements of optical absorption coefficients from weakly absorb ing solutions and liquids in the visible region of the light [2,3] or, by extending PAS to the near infrared (NIR), the determination of moisture in solid materials [7,8], as well as the possibility to observe Fingerprint spectra [1,5] and thus to examine surface properties of solid matter [6],…”