Abstract

The Dry Extract Spectroscopy by Infrared Reflection (DESIR) technique was used to predict bitterness, total soluble nitrogen and free amino nitrogen concentrations in beer. Spectra were recorded of the extracts of 65 beers and calibration was attempted using multiple linear and partial least squares regression on raw, derivative and transformed data. High correlations and low errors of prediction were obtained using the DESIR technique for the analysis of free amino nitrogen and total soluble nitrogen. However, poor correlations were observed between NIR spectral data and bitterness values. The technique was shown to be a rapid, repeatable and accurate alternative to traditional methods.

© 1993 NIR Publications

Spectral refractive index technique for monitoring the beer mashing process

F. S. de Almeida, A. C. P. Rocha, S. M. Lima, and L. H. C. Andrade
Appl. Opt. 57(16) 4672-4676 (2018)

Ocean analysis by means of Beer’s law

John E. Tyler
Appl. Opt. 15(10) 2565-2567 (1976)

Simple technique for producing a 1D periodic intensity profile with a desired open fraction for optical sensor applications

Sorakrai Srisuphaphon, Sitti Buathong, and Sarayut Deachapunya
J. Opt. Soc. Am. B 37(7) 2021-2025 (2020)

Applicability limits of Beer’s law for dispersion media with a high concentration of particles

Vladimir P. Dick
Appl. Opt. 37(21) 4998-5004 (1998)

Application of Hologram Techniques for Particle Size Analysis

Brian J. Thompson, John H. Ward, and William R. Zinky
Appl. Opt. 6(3) 519-526 (1967)