Erfahrungen mit der NIR-Reflexionsspektroskopie bei der Routine-Analyse von Stärken,Stärkederivaten und Stärkeverzuckerungsprodukten

Experiences with NIR-Reflectance Spectroscopy in Routine Analysis of Starches, Starch Derivatives and Starch Saccharification Products . Application of reflectance-techniques in the Near Infrared is possible without any sample pretreatment in most cases. For routine-use the development of microcomputers was necessary because no distinct absorptions are measured between 900 and 2 500 nm. Therefore identification of absorption bands is rather complicated. A new generation of instruments based on this principle enables a rapid analysis of many products consisting of several components. The electronically stored calibration curves are activated by pressing a push-button and the instrument is ready for the next sample. Analysis time including sampling is one minute. Experiences with this technique in analysis of corn, starches, starch derivatives and starch saccharification products as well as their components water, protein, starch, and degree of substitution (acetate, hydroxypropyl, cyanoethyl, cationic groups) and degree of degradation (dextrose-equivalent, carbonyl and carboxyl groups) are given in the lecture. Broad application is possible because of the flexibility of this technique. Simple handling is important for use by untrained people. Estimated pay-back-period therefore is one year at maximum.