Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun biochemistry A
chlorophyll from which the centralmagnesium atom has been removed
Etymologies
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Examples
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In even slightly acidic water, the plentiful hydrogen ions displace the magnesium, a change that turns chlorophyll a into grayish-green pheophytin a, chlorophyll b into yellowish pheophytin b.
On Food and Cooking, The Science and Lore of the Kitchen Harold McGee 2004
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In even slightly acidic water, the plentiful hydrogen ions displace the magnesium, a change that turns chlorophyll a into grayish-green pheophytin a, chlorophyll b into yellowish pheophytin b.
On Food and Cooking, The Science and Lore of the Kitchen Harold McGee 2004
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The structure shows the precise arrangement in the L and M subunits of the photochemically active groups – two chlorophyll molecules forming a dimer, two monomeric chlorophylls, two pheophytin molecules (these lack the central magnesium ion of chlorophyll), one quinone molecule, called
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When the vegetables are heated for longer periods of time or exposed to acid, the magnesium is removed from the center of the molecule and replaced with an atom of hydrogen, which in turn changes the chlorophyll a and chlorophyll b into pheophytin a and pheophytin b.
Popular Science 2009
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When the vegetables are heated for longer periods of time or exposed to acid, the magnesium is removed from the center of the molecule and replaced with an atom of hydrogen, which in turn changes the chlorophyll a and chlorophyll b into pheophytin a and pheophytin b.
Popular Science 2009
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Details in the protein environment around chlorophyll and pheophytin explain why only the right half (the
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