Pheophytin or phaeophytin is a chemical compound that serves as the first electron carrier intermediate in the electron transfer pathway of Photosystem II (PS II) in plants, and the type II photosynthetic reaction center (RC P870) found in purple bacteria.

Pheophytin a (Pheo) is the primary electron acceptor of PSII located toward the stromal side of the RC. It receives an electron from P680* in a few picoseconds to form a radical pair P680+Pheo−. The reduction of Pheo can be detected as an optical absorption decrease at 422 nm and its reduction potential is ∼−600 mV.

Pheophytin a | C55H74N4O5 | CID 135398712 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.

…the first acceptor may be pheophytin, which is a molecule similar to chlorophyll that also has a strong reducing potential and quickly transfers electrons to the next acceptor. Special quinones are next in the series. These molecules are similar to plastoquinone; they receive electrons from pheophytin and pass them to… Read More

1 day ago · The meaning of PHEOPHYTIN is a bluish black waxy pigment that can be formed from chlorophyll by replacement of the magnesium with two hydrogen atoms by treatment with a weak acid (as oxalic acid).

Pheophytin or Pheo is a chlorophyll molecule lacking a central Mg2+ ion which serves as the first electron carrier intermediate in the electron transfer pathway of photosystem II in plants and the photosynthetic reaction center RC P870 found in purple bacteria.

This minireview describes the discovery of participation of pheophytin, a metal-free derivative of chlorophyll, in the early steps of photosynthetic solar energy conversion as the primary electron acceptor of Photosystem II.

This minireview describes the discovery of participation of pheophytin, a metal-free derivative of chlorophyll, in the early steps of photosynthetic solar energy conversion as the primary electron acceptor of Photosystem II.

Pheophytin is a darker pigment with 10% higher specific absorbance at 665 nm compared to pheophorbide. Pheophytin is black and pheophorbide is brown; therefore, their relative proportion determines the blackness, an important criterion in the evaluation of made black tea.

1 day ago · Pheophytin is a form of chlorophyll a in which the magnesium ion is replaced by two hydrogen ions. It participates in the crucial step of converting light energy to chemical energy.