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Journal of Automated Methods and Management in Chemistry
Volume 2006, Article ID 51342, 4 pages
http://dx.doi.org/10.1155/JAMMC/2006/51342

Direct Determination of Moisture in Powder Milk Using Near Infrared Spectroscopy

Optical Radiation Standards, National Physical Laboratory, K. S. Krishnan Road, New Delhi 110012, India

Received 24 January 2006; Revised 6 March 2006; Accepted 18 May 2006

Copyright © 2006 R. Nagarajan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Moisture content in commercially available milk powder was investigated using near infrared (NIR) diffuse reflectance spectroscopy with an Indian low-cost dispersive NIR spectrophotometer. Different packets of milk powder of the same batch were procured from the market. Forty-five samples with moisture range 4–10% were prepared in the laboratory. Spectra of the samples were collected in the wavelength region 800–2500 nm. Moisture values of all the samples were simultaneously determined by Karl Fischer (KF) titration. These KF values were used as reference for developing calibration model using partial least squares regression (PLSR) method. The calibration and validation statistics are Rcal2:0.9942, RMSEC:0.1040, and Rval2:0.9822, RMSEV:0.1730. Five samples of unknown moisture contents were taken for NIR prediction using developed calibration model. The agreement between NIR predicted results and those of Karl Fischer values is appreciable. The result shows that the instrument can be successfully used for the determination of moisture content in milk powder.