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- W2029351307 abstract "We have developed a method to accurately and reproducibly determine the total activity of cytochrome oxidase (CO) in rat brain tissue homogenates. Previously, accurate measurements have been difficult to obtain because detergents, which are needed to disrupt membranes and unmask CO, also inhibit the enzyme by solubilizing certain phospholipids required for rapid turnover. We compared various methods of sample preparation, and found that maximal CO activity in homogenates could be obtained using specific concentrations of detergents. The range of optimal detergent concentrations was relatively narrow, as CO activity fell sharply with small deviations from the optimum. Of 5 detergents tested, deoxycholate stimulated CO maximally over the widest range of concentrations. In deoxycholate-treated homogenate samples, the calculated CO turnover number was about 480 s−1, indicating that overall enzyme activity was maximal or near maximal, and therefore that the total content of CO was probably detected. This method was reproducible with large or small samples (e.g., < 1 mg tissue), and should be applicable to studies of neural tissue in general." @default.
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- W2029351307 date "1993-12-01" @default.
- W2029351307 modified "2023-09-23" @default.
- W2029351307 title "An optimized method for determining cytochrome oxidase activity in brain tissue homogenates" @default.
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- W2029351307 doi "https://doi.org/10.1016/0165-0270(93)90038-s" @default.
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