On Reflectometric Measurement of a Refractive Index of Milk

The refractive index of milk samples was measured with a reflectometer. Fresnel's formula for intensity reflectance and the concept of critical angle were applied to measured data. Milk samples were also measured with surface plasmon resonance sensor for refractive index assessment. The experim...

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Bibliographic Details
Published in:Journal of dairy science 2001-01, Vol.84 (1), p.38-43
Main Authors: Jääskeläinen, A.J., Peiponen, K.-E., Räty, J.A.
Format: Article
Language:English
Subjects:
Absorption
Animals
Biological and medical sciences
Chemical Phenomena
Chemistry, Physical
Food industries
Fundamental and applied biological sciences. Psychology
Lipids - analysis
milk
Milk - chemistry
Milk and cheese industries. Ice creams
Particle Size
reflectometer
refractive index
Refractometry - methods
Sensitivity and Specificity
surface plasmon resonance
Surface Plasmon Resonance - methods
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Summary:The refractive index of milk samples was measured with a reflectometer. Fresnel's formula for intensity reflectance and the concept of critical angle were applied to measured data. Milk samples were also measured with surface plasmon resonance sensor for refractive index assessment. The experiments were carried with commercial milk that had fat volume concentrations of 0.004, 1.53, and 3.55%. We observed that simultaneously quantitative information about the refractive index and absorption of milk, as a function of fat concentration, could be obtained with both devices.
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.S0022-0302(01)74449-9