引用本文:
李刚, 罗来斌, 陈慧兰, 傅少伟, 张淑仪. 光声量热法测定辅酶B12光解的焓变和体积变化[J]. 物理化学学报,
1998, 14(07): 615-619.
doi:
10.3866/PKU.WHXB19980708
Citation: Li Gang, Luo Lai-Bin, Chen Hui-Lan, Fu Shao-Wei, Zhang Shu-Yi. Determination of Enthalpy and Volume Changes in Photolysis of Coenzyme B12 Using Photoacoustic Calorimetry[J]. Acta Physico-Chimica Sinica, 1998, 14(07): 615-619. doi: 10.3866/PKU.WHXB19980708
Citation: Li Gang, Luo Lai-Bin, Chen Hui-Lan, Fu Shao-Wei, Zhang Shu-Yi. Determination of Enthalpy and Volume Changes in Photolysis of Coenzyme B12 Using Photoacoustic Calorimetry[J]. Acta Physico-Chimica Sinica, 1998, 14(07): 615-619. doi: 10.3866/PKU.WHXB19980708
光声量热法测定辅酶B12光解的焓变和体积变化
English
Determination of Enthalpy and Volume Changes in Photolysis of Coenzyme B12 Using Photoacoustic Calorimetry
Abstract:
The photolysis of coenzyme B12 (5'-deoxyadenosylcobalamin, AdoCbl) at 355nm in aqueous solution is investigated by Photoacoustic Calorimetry (PAC). Both enthalpy and reaction volume change for this photoinitiated reaction have been determined to be 131±12 kJ.mol-1 and 61 mLmol-1 , respectively. It can be suggested that the reaction volume change is related tothe conformational change of corrin ring which accompanies the homolytic cleavage of the cobalt-carbon(Co-C) bond.
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Key words:
-
Coenzyme B12
- / Photoacoustic calorimetry
- / Enthalpy
- / Volume change
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