Abstract

Two types of plastochromanols have been isolated and identified from leaf tissue. One type has a tertiary hydroxyl group in the isoprenoid side-chain and may be derived from plastoquinone C while the other has an esterified secondary hydroxyl function as found in plastoquinone B. These have been referred to as plastochromanol C and B respectively. In contrast to plastochromanol itself they are only found in photosynthetic tissue where they are present in only minor quantities compared with plastoquinone. These new plastochromanols are considered to be products of plastoquinone metabolism.

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