Abstract
CERTAIN plants have been found to yield a thermostable system which slowly produces a blue-green pigment by atmospheric oxidation. After acidifying with hydrochloric acid, the green colour was changed to red. If the first green solution was allowed to stand, the green changed back to the original yellowish colour, with the exception of the surface layer, which remained greenish. Thus the above green pigment may serve as a natural indicator in various physiological investigations; its chemical nature is now under investigation.
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KOZLOWSKI, A. Formation of a Green Oxidation-Reduction Indicator in Plant Extracts. Nature 165, 495 (1950). https://doi.org/10.1038/165495a0
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DOI: https://doi.org/10.1038/165495a0
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