Fourier Transform Infrared Spectroscopy (FTIR) at ETS is an extremely valuable technique that provides rapid analysis in combination with precision and accuracy equal, or superior, to reference methods.
FTIR is a very precise tool, in the right hands, but is valuable only when combined with calibrations built and maintained continuously. At ETS our FTIR calibrations were built over several years with far more than 100,000 reference analyses providing the basis of our proprietary calibrations. Samples are run continuously using reference techniques in comparison with FTIR to maintain and enhance our calibrations.
FTIR directs infrared light through a sample, which absorbs a portion of the light based on the sample’s chemical composition. The light which is not absorbed is split into two beams, one of which is reflected by a movable mirror. The two waves are recombined and recorded by a detector. The movable mirror causes the two waves to travel different distances, which leads to interference. The waves are recombined and mathematically interpreted, using Fourier Transform, for the determination of various properties including pH, titratable acidity, and alcohol.
Alpha Amino Nitrogen, also referred to as Nitrogen by OPA, or NOPA, measures the amount of primary amino acids available for use by yeast during fermentation. NOPA is often measured in conjunction with ammonia to obtain the Yeast Assimilable Nitrogen (YAN).
We achieve economies of scale here at ETS based on the volume of samples
processed at a given time. As a consequence we are pleased to pass these
savings on to our customers, offering discounts for multiple sample
submissions. These discounts apply only to samples submitted at the same