3. a. Is commercial green food color the same as a mixture of yellow and blue fo
ID: 1052485 • Letter: 3
Question
3. a. Is commercial green food color the same as a mixture of yellow and blue food colors, i.e.. exactly the same number and colors of resolved spots? b. If not, how is the mixture of blue and yellow food colors different from green food color? 4. If two samples on the same paper chromatogram do not migrate the same distance, cant the same paper chromatogram do not migrate the same distance, can they be the same substance? 5. Look at the structures of the 4 FDA FD&C; certified food colors. Note that the structures are all sodium salts. What desirable physical property does this feature convey to food colors? 6. Shown below is the structure of lycopene, an isoprenoid red pigment from tomatoes. What is the relationship of the double bonds to each other? This structural feature makes lycopene red. What structural feature makes the food dyes colored? Paper Chromatography of Food Dyes P 6 of 6
Explanation / Answer
answer 1) no the commercial green food colour is the same as a mixture of blue and yellow food colours i.e exactly the same number and colours of resolved spots .
answer 1 b) the mixture of yellow and blue food colours are different from that of green
as the compounds present in yellow and blue are different ( having different molecular formula ) when compared to green ( which contain some other type of compounds )
can they be of s
answer 2) if two sample cannot migrate same distance in same chromatogram can they be of same substance
yes
answer3 ) the colour of dye can be visiible due to the presence of -ve charge these electron can excite and impart colour in visivble range . thus sodium helps in accuring these -ve charges as it make ionic bonds with the compound .
answer4 )as we can see it contain eleven conjugated double bonds.these conjugated system reduces the energy required for electrons to transition to higher energy state which allows the molecule to absorb light odf visible region and impart colour of longer wavelength (imparts red ) .
the presence of colour in food colour is due presence of different Chromophores . these chromophore absorb light in visible region and impart colour .
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