393
Volume 5, Issue 10: Special Issue
(EJAR)
ISSN: 2181-2020
MPHAPP
THE 6TH INTERNATIONAL SCIENTIFIC AND PRACTICAL
CONFERENCE
“
MODERN PHARMACEUTICS: ACTUAL
PROBLEMS AND PROSPECTS
”
TASHKENT, OCTOBER 17, 2025
in-academy.uz
DETERMINATION OF OPTICAL PROPERTIES OF COLORANTS IN SOME
CONFECTIONERY PRODUCTS
Taniyev O.U.
Tashkent Pharmaceutical Institute, Tashkent city, Republic of Uzbekistan
E-mail: oxunjontaniyev@gmail.com, Tel:+99899-121-27-55
https://doi.org/10.5281/zenodo.17339536
Currently, synthetic dyes are widely used in the production of food products, pharmaceuticals
and beverages. This, in turn, requires constant control over the quantity and quality of these dyes that
can be added.[1,2]
In this article, selected blue, black, red and yellow confectionery products were taken for
analysis and first the light reflection properties and then the optical properties of their solutions were
analyzed using a spectrophotometer.[3,4]
The aim of the experiment was a qualitative and quantitative analysis of the dyes contained in
selected colored confectionery products. The resulting confectionery products consisted of red,
yellow, blue, and black dyes, as well as natural beetroot dye. Each product was dry-weighed on a
precision analytical balance and ground into powder. The optical properties of the powder were
preliminarily analyzed using an X.Rite.eye one pro instrument. The results are presented in the table.
As can be seen from the resulting table, we can see that the highest light reflectance coefficient
(R) belongs to the red color. At λ =700nm, R
red
=0.6802, at λ =700nm, R
blue
=0.35098, at λ=700nm,
R
black
=0.34273. It was found that the R values of blue and black are close to each other.
λnm
R
1
yellow
R
2
red
R
3
blue
R
4
black
350
0,05192
0,13828
0,16087
0,09114
400
0,04246
0,13468
0,14675
0,0834
450
0,0394
0,12166
0,15011
0,07763
500
0,091
0,06307
0,29578
0,04789
550
0,22338
0,06031
0,26511
0,04628
600
0,45159
0,35653
0,08535
0,07414
650
0,46126
0,6014
0,06472
0,05628
700
0,48562
0,6802
0,35098
0,34273
