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Hemoglobin from bovine blood was obtained from Sigma. Methemoglobin was prepared by oxidation of Hb with a 2-fold excess of potassium ferricyanide
and passage through a Sephadex G-25 column using 10 mM phosphate buffer (pH 7.0) as an eluent. Oxyhemoglobin was obtained by reduction of Hb with a 10-fold excess of sodium dithionite. The solution was then bubbled with O2 and purified on a Sephadex G-25 column. Concentrations of metHb and oxyHb were determined spectrophotometrically using ¦Å405 = 1.79 ¡Á 105 M¨C1 cm¨C1 and ¦Å500 = 1.00 ¡Á 104 M¨C1 cm¨C1 for metHb, ¦Å415 = 1.25 ¡Á 105 M¨C1 cm¨C1 and ¦Å577 = 1.38 ¡Á 104 M¨C1 cm¨C1 for oxyHb, b, expressed per heme (Antonini & Brunori, 1971). FerrylHb was prepared by incubation 1.5 ¡Á 10¨C5 M MetHb with an equimolar amount of H2O2 in relation to the heme group in 10 mM phosphate buffer at room temperature for 5 min (Sztiller et al., 2006).

ÖØµãÊÇ ¦Å415 = 1.25 ¡Á 105 M¨C1 cm¨C1 and ¦Å577 = 1.38 ¡Á 104 M¨C1 cm¨C1 for oxyHb, ²âÍêÕâÁ½¸öÖµÖ®ºó£¬ÊÇÏà¼ÓµÃ³öoxyHbµÄŨ¶ÈÂð£¿ÎÄÕÂÀïÃæËÆºõ²¢Ã»Óн²Çå³þ¡£ÇóÖú¸÷λ¸ßÊÖ¸ø½â¾öһϣ¡
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