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.

脫鎂葉綠素（英語： Pheophytin ，中國也稱為褐藻素）與光合作用中光反應的電子傳遞鏈有關。 葉綠素 在經過加酸或加熱或脫鎂作用後會變成脫鎂葉綠素，顏色也會改變。

脫鎂葉綠素（英語： Pheophytin ，中國也稱為褐藻素）與光合作用中光反應的電子傳遞鏈有關。 葉綠素 在經過加酸或加熱或脫鎂作用後會變成脫鎂葉綠素，顏色也會改變。

Pheophytin a is a pheophytin. It is a conjugate acid of a pheophytin a (1-). Pheophytin a has been reported in Camellia sinensis, Alloberberis fremontii, and other organisms with data available. Conformer generation is disallowed since too many atoms, too flexible.

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.

叶绿素酶是一个已被发现近一个世纪的“古老”的酶、长期以来被认为是高等植物叶绿素降解途径的第一个酶，催化叶绿素的脱植基反应；然而，同时期针对拟南芥叶片衰老的研究却表明，叶片衰老时叶绿素降解过程中的脱植基反应由脱镁叶绿素水解酶（Pheophytin ...

2018年4月15日 · Zn-pheophytins remarkably suppressed the inflammatory responses of macrophages. The aims of this study were to synthesize chlorophyll derivatives, pheophytins and Zn-pheophytins, from chlorophylls extracted from spinach, characterize them, and evaluate their antioxidant and anti-inflammatory activities.

Pheophytin A具有以下主要用途： 它被认为可能对预防心血管疾病和一些癌症有保护作用。 Pheophytin A的制法通常是从叶绿素中提取，并接受一系列的纯化和合成步骤。

…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

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.