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Chlorophyll ''c'' is a form of chlorophyll found in certain marine algae, including the photosynthetic Chromista (e.g. diatoms and brown algae) and dinoflagellates. It has a blue-green color and is an accessory pigment, particularly significant in its absorption of light in the 447–52 nm wavelength region. Like chlorophyll ''a'' and chlorophyll ''b'', it helps the organism gather light and passes a quanta of excitation energy through the light harvesting antennae to the photosynthetic reaction centre. Chlorophyll ''c'' is unusual because it has a porphyrin ring structure and does not have an isoprenoid tail or a reduced ring D, features typical of the other chlorophylls commonly found in algae and plants. Chlorophyll ''c'' can be further divided into chlorophyll ''c1'', chlorophyll ''c2'', and chlorophyll ''c3'', plus at least eight other more recently found subtypes.

Chlorophyll ''c1''

Chlorophyll ''c1'' is a common form of chlorophyll ''c''. It differs from chlorophyll ''c2'' in its C8 group, having an ethyl group instead of vinyl group (C-C single bond instead of C=C double bond). Its absorption maxima are around 444, 577, 626 nm and 447, 579, 629 nm in diethyl ether and acetone respectively.

Chlorophyll ''c2''

Chlorophyll ''c2'' is the most common form of chlorophyll ''c''. Its absorption maxima are around 447, 580, 627 nm and 450, 581, 629 nm in diethyl ether and acetone respectively.

Chlorophyll ''c3''

Chlorophyll ''c3'' is a form of chlorophyll ''c'' found in microalga ''Emiliania huxleyi'', identified in 1989. Its absorption maxima are around 452, 585, 625 nm and 452, 585, 627 nm in diethyl ether and acetone respectively.


References


{{Plant pigments Category:Porphyrins Category:Photosynthetic pigments Category:Brown algae Category:Diatom biology