Accuracy of near infrared spectroscopy in relation to precision of calibration data

Authors
Citation
Lk. Sorensen, Accuracy of near infrared spectroscopy in relation to precision of calibration data, MILCHWISSEN, 56(4), 2001, pp. 190-193
Citations number
9
Categorie Soggetti
Food Science/Nutrition
Journal title
MILCHWISSENSCHAFT-MILK SCIENCE INTERNATIONAL
ISSN journal
00263788 → ACNP
Volume
56
Issue
4
Year of publication
2001
Pages
190 - 193
Database
ISI
SICI code
0026-3788(2001)56:4<190:AONISI>2.0.ZU;2-V
Abstract
To obtain a more precise estimate of the accuracy of near infrared (NIR) sp ectroscopy in determination of total solids and fat in cheese, the measured standard error of prediction (SEP) should be corrected for imprecision of the reference method. High precision of reference data obtained through rep licate analyses may not be the optimal goal in practice for the development and maintenance of calibration equations. In a situation of limited resour ces, it may be better to accept an increase in imprecision by reducing the number of replicate analyses for each sample and instead introducing additi onal samples. In the case here reported, it was possible to increase the st andard deviation related to precision of reference data from 0.08 to 0.14% for total solids and from 0.08 to 0.16% for fat without any pronounced effe ct on the accuracy of NIR transmission spectroscopy in the calibration rang e 50-63% for total solids and 23-29% for fat. The mean SEPs were 0.19% for total solids and 0.18% for fat. if the standard deviation was increased fro m 0.08 to 0.32% for total solids and from 0.08% to 0.28% for fat, the mean absolute increases in SEPs were 0.02% for total solids and 0.03% for fat.