title: Plastoquinone B.
abstract: A compound found in spinach and other higher plants previously referred to as R 263 has now been found to be a breakdown product of plastoquinone B. This quinone, PQ B, is found with 8 other quinones in spinach chloroplasts. These 9 quinones are PQ A, PQ B, PQ C, PQ D (7, 8, 15) Vitamin K(1) (10, 12), an unknown naphthoquinone (13) and alpha-, beta- and gamma-tocopherylquinones (7, 12). An improved method for purification of plastoquinone B is described. Previous confusion of this compound with other quinoid material on silica gel is described and corrected R(F) values are given. The activity of PQ B is similar to the activity of PQ C in restoration studies of the photo-reduction of ferricyanide and indophenol.
authors.affiliation: Department of Biological Sciences, Purdue University, Lafayette, Indiana.
authors.forename: M D
authors.initials: MD
authors.lastname: Henninger
authors.forename: R
authors.initials: R
authors.lastname: Barr
authors.forename: F L
authors.initials: FL
authors.lastname: Crane