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Monitoring electron transfer by photoacoustic spectroscopy in native and immobilized thylakoid membranes
Author(s) -
Carpentier Robert,
Leblanc Roger M.,
Mimeault Murielle
Publication year - 1988
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.260320110
Subject(s) - thylakoid , photoacoustic spectroscopy , glutaraldehyde , photoacoustic imaging in biomedicine , chemistry , electron transfer , membrane , analytical chemistry (journal) , electron transport chain , spectroscopy , matrix (chemical analysis) , chromatography , photochemistry , biochemistry , optics , chloroplast , physics , gene , quantum mechanics
Photoacoustic spectroscopy was used to monitor photo synthetic electron transfer in native and immobilized thylakoid membranes. The photoacoustic parameter ϕ r ′ (the percentage of absorbed energy that is stored in photo chemical intermediates) and i 50 (the half‐saturation modulated light intensity) were directly correlated to electron transfer rates. As previously shown, thylakoids immobilized in an albumin‐glutaraldehyde matrix were more resistant to aging. The inhibitory effects of the immobilization procedure and of aging at 4°C were detected as a decrease in i 50 values. In analogy with enzyme kinetic analysis, the effect could be characterized as a competitive type of inhibition. Photoacoustic measurements are performed in conditions similar to a working bioreactor cell with regards to the sample preparation.