NATURAL DYES -pH INDICATOR

         Very often my mother does a lot of recipes with purple cabbage. Usually, served as salad, soup and fried rice and am greatly drawn because of its captivating color.💜

          I searched the thing that is responsible for its color in my browser which responded me, "Purple cabbage contains anthocyanin or flavonoid- phytonutrient- chemical produced by plants-plants uses these chemicals to stay healthy-phytochemicals have antioxidant(substance that prevent damage to cells) and anti-inflammatory (substance that reduce swellings) benefits."💪

         Further, it emphasize the anthocyanins are used as pH indicators. That means, it shows different colors at different pH level. I was too engrossed to see the other side of my purple cabbage containing anthocyanin.😊 To try it out, I inspected the color change with neutral medium(water), strongly basic medium(detergent/floor cleaner) and strongly acidic medium(lemon juice/vinegar).

pH indicator	pH 6-7 (color in neutral)	pH>7 (color in alkali)	pH<6 (color in acid)
Litmus	Purple	Blue	Red
Phenolphthalein	Colorless	Pink	Colorless
Methyl orange Similarly, anthocyanin present in purple cabbage	Orange  BLUE	Yellow  GREEN	Red RED

  

     EXTRACTION OF ANTHOCYANIN-Soluble in water :-) Blue in water

                                 STRUCTURE OF ANTHOCYANIN IN NEUTRAL MEDIUM

                                           ANTHOCYANIN BEHAVES AS AN INDICATOR

FROM LEFT TO RIGHT
First: Anthocyanin is blue in water.
Middle: Anthocyanin is green in detergent.
Last: Anthocyanin is red in vinegar.

                                                               NATURAL pH PAPERS

Soak few cellulose (ordinary paper) in that extraction for an hour. Make it dry (room temperature).

                                                     Come on yaar, let's do this together! 

COOL😎

                                  CHEMISTRY BEHIND THE COLOR TRANSFORMATION

           These color changes are due to the presence of conjugated system in anthocyanin structure.

Quinoidal Base (Blue)

                                                                                ↓

Flavylium cation(Red)

                                                                                   ↓

Chalcone (Green)

                                       
                                                          🆃🅷🅰🅽🅺 🆈🅾🆄 🅰🅻🅻