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Van der Waals parameters, refractive indices and dispersion equation of pectin

KR. NIKOLOVA1,* , I. PANCHEV1, S. SAINOV2

Affiliation

  1. Department of Physics, University of Food Technologies, 4002 Plovdiv, 26 Maritza Blvd., Bulgaria
  2. Central Laboratory of Optical Storage and Processing of Information, BAS, 1113 Sofia, Acad. G. Bonchev Str., bl. 101, Bulgaria

Abstract

The refractive indices of water solutions and films from apple and citric pectin with concentration 1 and 2% are measured at two wavelengths ()nm8.632,nm53221==λλ with a laser refractometer. The Van der Waals parameters – the characteristic frequency ω and dispersion coefficient C are determined from the refractive indices of the films. The results show that the dispersion coefficient C lies in the range 0.292 - 0.295 and the characteristic frequency varies between srad1610.8.2 and 16101.3×srad for these polysaccharides. From the latter facts it is clear that the dispersion coefficients of apple and citric pectin are higher than those of the phospholipids (C lies in the range 0.27 to 0.28) but lower than those of the proteins (C lies in the range 0.309 to 0.317)..

Keywords

Van der Waals parameters, Refractive index, Pectin.

Submitted at: Nov. 1, 2006
Accepted at: Feb. 15, 2007

Citation

KR. NIKOLOVA, I. PANCHEV, S. SAINOV, Van der Waals parameters, refractive indices and dispersion equation of pectin, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 2, pp. 468-470 (2007)