| dc.description.abstract | The purpose of this study was to validate quick and convenient methods for
evaluation of Rhodamine B (RhB) contamination in Vietnamese foods as well as
to examine the situation of contamination. The study involved qualitative
detection of RhB and its quantification in Vietnamese foods sold in Hochiminh
city and Binh Duong province markets. The randomly sampled foods were of
street vendor as well as brand-named foods. Thin layer chromatography, based
on the florescent characteristic of RhB and the simple chemical method, based
on the changes in color were applied to detect the presence of RhB in food. The
UV-Vis spectrophotometer at 503 nm was applied to quantify the level of RhB in
food. A total number of 165 food samples of different sources were collected.
The results showed that 12% of samples was contaminated with RhB. All of the
positive samples came from street vendor type of foods while all brand-named
samples were negative to contamination. From positive samples, majority (11%)
was of liquid samples, making a ratio 26% of contamination in liquid foods, while
the ratio of contamination within solid foods was 4% only. Regarding the street
vendor foods, the ratio of positive samples was 19%, while practically there was
no contamination in the brand-named foods. The level of contamination ranged
from 32 to 180 ppm. This level was thousand to hundred thousand times higher
than the alarming level in the EU market. The presented procedures were
successfully applied for evaluation of Rhodamine B contamination in both liquid
and solid food samples.
Key words: Rhodamine B (RhB), simple chemical, Thin layer chromatography
(TLC), Ultra violet visible spectrophotometer (UV- VIS), Vietnamese foods. | en_US |
