banana iodine solution

banana iodine solution 40X

When iodine, dissolved in potassium iodide, is mixed with starch, it creates a purple/blue color emitting the starch if there are any.

Here, the pictures show the large array of starches covering the banana when stained with iodine.

If there weren't any starch in the banana, the pictures would have been emitted with a brown color. 

banana iodine solution 100X

Just a word of advice but if you want an energy boost, it is best to consume bananas because of 

their high concentration of starch. Starch's only function for the human body is to convert glucose into energy. It is actually broken down in your mouth to simpler carbohydrates called maltose.

banana iodine solution 400X

James Kennedy, a high school chemistry teacher in Australia, created posters showing the compounds in fruits and other natural foods to illustrate that chemicals are an unremarkable part of life.

INGREDIENTS: WATER (75%), SUGARS (12%) (GLUCOSE (48%),

FRUCTOSE (40%), SUCROSE (2%), MALTOSE (<1%)), STARCH

(5%), FIBRE E460 (3%), AMINO ACIDS (GLUTAMIC ACID (19%),

ASPARTIC ACID (16%), HISTIDINE (11%), LEUCINE (7%), LYSINE

(5%), PHENYLALANINE (4%), ARGININE (4%), VALINE (4%),

ALANINE (4%), SERINE (4%), GLYCINE (3%), THREONINE (3%),

ISOLEUCINE (3%), PROLINE (3%), TRYPTOPHAN (1%), CYSTINE

(1%), TYROSINE (1%), METHIONINE (1%)), FATTY ACIDS (1%)

(PALMITIC ACID (30%), OMEGA-6 FATTY ACID: LINOLEIC ACID

(14%), OMEGA-3 FATTY ACID: LINOLENIC ACID (8%), OLEIC ACID

(7%), PALMITOLEIC ACID (3%), STEARIC ACID (2%), LAURIC ACID

(1%), MYRISTIC ACID (1%), CAPRIC ACID (<1%)), ASH (<1%),

PHYTOSTEROLS, E515, OXALIC ACID, E300, E306

(TOCOPHEROL), PHYLLOQUINONE, THIAMIN, COLOURS

(YELLOW-ORANGE E101 (RIBOFLAVIN), YELLOW-BROWN E160a),

FLAVOURS (3-METHYLBUT-1-YL ETHANOATE, 2-METHYLBUTYL

ETHANOATE, 2-METHYLPROPAN-1-OL, 3-METHYLBUTYL-1-OL, 2-

HYDROXY-3-METHYLETHYL BUTANOATE, 3-METHYLBUTANAL,

ETHYL HEXANOATE, ETHYL BUTANOATE,, PENTYL ACETATE),

1510, NATURAL RIPENING AGENT (ETHENE GAS).