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- W2092848530 abstract "Electron paramagnetic resonance (EPR) spectroscopy was used to compare the rates of autoxidation at 37 degrees C of acellular and liposome-encapsulated hemoglobin (LEH) crosslinked between alpha chains with bis (3,5-dibromosalicyl) fumarate (alphaalphaHb). This method avoids the difficulties inherent in using conventional ultraviolet-visible (UV-vis) spectroscopy caused by the high turbidity of liposome suspensions. Rate constants of 0.039/h and 0.065/h were obtained for the alphaalphaHb and LEH samples, respectively. Similar oxidation measurements with alphaalphaHb using UV-vis spectroscopy gave a rate constant comparable to that obtained with EPR spectroscopy. Indirect measurement of the oxidation kinetics of LEH utilizing extraction of alphaalphaHb with chloroform from partially oxidized LEH samples was unreliable because the amount of extractable hemoglobin was inversely proportional to the degree of oxidation. EPR measurements showed a shift in the g value and substantial enhancement in the intensity of the bis-histidine low-spin B complex for the encapsulated hemoglobin, indicating a perturbation of this low-spin complex. We suggest that lipid-associated perturbations are responsible for the enhancement of the oxidation observed with the LEH samples compared to the unencapsulated material." @default.
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- W2092848530 date "2001-01-01" @default.
- W2092848530 modified "2023-09-28" @default.
- W2092848530 title "DIRECT MEASUREMENTS OF HEMOGLOBIN INTERACTIONS WITH LIPOSOMES USING EPR SPECTROSCOPY" @default.
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- W2092848530 doi "https://doi.org/10.1081/bio-100001252" @default.
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