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Iodine test on an unripe banana

Iodine test on an unripe banana

C033/2860

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63.3 MB (2.3 MB compressed)

5760 x 3840 pixels

48.8 x 32.5 cm ⏐ 19.2 x 12.8 in (300dpi)

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Credit

MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY

Caption

Iodine test on an unripe banana. The skin of unripe bananas is green due to the chlorophyll content of the peel which supplies nutrients (mainly starch) to the fruit. When the starch has been stored in the fruit, it is firm and an optimal size. Testing the fruit at this point with iodine will turn black because iodine turns black in the presence of starch. As the fruit ripens the chlorophyll in the peel breaks down, turns yellow, and the starch is converted to simple sugars.

Release details

Model release not required. Property release not required.

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