arkoma
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Anthocyanin Indicator Papers
(GODDAMN XMB, third time i've entered this, so MULTIPLE edits will be made so i don't type it TEN times)
Being intrigued by purple cabbage indicator, last Saturday I gathered up my digital camera and some sample bags and headed out into the neighborhood
to gather up some pigments. I picked eight different flowers, and already had blueberry juice.
Sample #1 Pansies 
Sample #2 Petunias 
Sample #3 Red/Orange rose 
Sample #4 Yellow rose 
Sample #5 Pink Rose 
Sample #6 Red Hollyhock 
Sample #7 Pink Snapdragon 
Sample #8 Unknown Purple Flower 
Sample #9 is Blueberry juice
I returned home and gathered up 9 wineglasses and boiled some DH2O. I placed some of each flower and 20ml boiling water in each one and
let steep for 20 minutes then soaked a quarter sheet of filter paper ineach for 15 minutes. Let them air dry.
I made myself a grid on the back of an old campaign sign, and arranged samples of each indicator on it.
I used one drop of each of the following reagents on my samples:
HCl (aq)
5% White Vinegar
Saliva
Saturated Solution of NaHCO3
Household Aqueous NH3
Saturated Solution of NaOH
[Edited on 6-3-2014 by arkoma]
[Edited on 6-3-2014 by arkoma]
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[Edited on 6-3-2014 by arkoma]
[Edited on 6-3-2014 by arkoma]
"We believe the knowledge and cultural heritage of mankind should be accessible to all people around the world, regardless of their wealth, social
status, nationality, citizenship, etc" z-lib
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numos
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Interesting, is the pure form a solid? Would it be possible to purify/concentrate? Apparently some Anthocyanin fluoresces, Your best luck in finding
them in bulk may be purple corn which has a very large concentration of the substance, 1.5% in weight... Quite a bit for a pigment.
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arkoma
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sorry for the mess ^^. SEVERE internet problems, and now I have to go to work 
Will edit in my conclusions this evening
"We believe the knowledge and cultural heritage of mankind should be accessible to all people around the world, regardless of their wealth, social
status, nationality, citizenship, etc" z-lib
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The Volatile Chemist
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Quote: Originally posted by arkoma  | | sorry for the mess ^^. SEVERE internet problems, and now I have to go to work
Will edit in my conclusions this evening |
Some FINE work! Well done! (This prob belongs in the bio. section of SM, but that's ok.)
Very interesting, I love the pictures. If you like the idea I posted about in: http://www.sciencemadness.org/talk/viewthread.php?tid=30490 I'd love if you put your final work where I talk about there.
Nice job!
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arkoma
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Thanks, young fella ^^ I was really intrigued by the SHARP color change in the blueberry papers at the high end of the pH scale. The anthocyanin
pigments change color by picking up and shedding hydroxyl groups so that kinda makes sense. Reference
And it's here in "reagent and apparatus acquisition" because I have neither a pH meter or "store bought" pH papers, and there are probably other
members in the same predicament. I can barely afford to "pay attention" but I can STILL do science!
 
^^^^ A veritable cornucopia of indicators!! (where all but first two samples came from)
"We believe the knowledge and cultural heritage of mankind should be accessible to all people around the world, regardless of their wealth, social
status, nationality, citizenship, etc" z-lib
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UnintentionalChaos
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Sample 8 is Larkspur or Delphinium, which are closely related.
Here are some other good choices:
Red Hibiscus flower. Can be purchased for very little as an herbal tea. Has a red --> green shift from acid to base.
Curcuminoids (from turmeric root, a common spice, especially in indian cooking). These are oil/alcohol/acetone soluble and poorly soluble in water.
Color shifts from bright yellow to red in base.
Department of Redundancy Department - Now with paperwork!
'In organic synthesis, we call decomposition products "crap", however this is not a IUPAC approved nomenclature.' -Nicodem
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sparkgap
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Should you be able to get to hydrangeas, you might also want to include them in your experiments.
sparky (~_~)
"What's UTFSE? I keep hearing about it, but I can't be arsed to search for the answer..."
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The Volatile Chemist
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Again, nice job, and good suggestions, UnC. ! (sorry for the abbrev. ...)
Arkoma, in regards to the site I linked to, thanks for posting on it! It may come down if there is no interest in it, but thanks!
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