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Rapid-scan FTIR difference spectroscopy was used to investigate light-induced reduction of the ubiquinone Q B , and the oxidation kinetics of Q B  – and QH 2 by external mediators in isolated reaction centers (RCs) from R. sphaeroides . As redox mediators, a Ferrocyanide/N,N,Nʹ,Nʹ-tetramethyl- p -phenylenediamine (TMPD) mixture and an Ascorbate/2,3,5,6-tetramethyl- p -phenylenediamine (DAD) mixture are compared.  Results show that TMPD red rapidly reduces the photoproduced P 870  + primary donor. The process is fast enough to record rapid-scan FTIR spectra devoid of P 870  + bands down to 260 K. Results show also that TMPD ox oxidises both Q B  – and QH 2 faster than DAD ox . In particular, Q B  – is oxidised faster than QH 2 at all temperatures studied.  Results are discussed in the framework of time-resolved infrared studies on R. sphaeroides RCs, showing advantages/drawbacks of the proposed experimental approach.

Rapid-scan FTIR difference spectroscopy applied to ubiquinone reduction in photosynthetic reaction centers: Role of redox mediators