腺苷钴胺光降解产物相关性研究

摘 要 目的：研究可见光区不同波长与光照度下腺苷钴胺的光降解产物相关性。方法: 分别在400，450，500，550，600，650，700 nm的波长下，50，100，200，300，400，500 Lx的光照度下，对腺苷钴胺对照品溶液进行40 min的光照试验，采用HPLC法，对光降解后的腺苷钴胺溶液进行测定，计算光降解产物羟钴胺素和腺苷的含量及其比例，并用质谱进行确认。结果: 腺苷钴胺主要光降解产物杂质Ⅰ、腺苷、羟钴胺素三者的光降解趋势整体为一致，在50～200 Lx的范围内，光照强度对腺苷钴胺的光降解产物羟钴胺素与腺苷的浓度比值影响比较明显，在200 ～500 Lx的范围内影响较小，在不同波长与光照度下腺苷钴胺的光降解产物羟钴胺素的量均高于相同条件下光降解产物腺苷的量。结论: 本法在最优避光条件下对腺苷钴胺的光降解产物进行了研究，此法准确可靠，可对腺苷钴胺的光降解有关物质进行有效控制。

Correlation Research on Photodegradation Products of Cobamamide

ABSTRACT Objective: To research the correlation between the cobamamide photodegradation products in the visible light area at different wavelengths and the photodegradation rate intensity. Methods: The 40 minute illumination experiment was conducted for cobamamide reference solution respectively at the wavelength of 400 nm, 450 nm, 500 nm, 550 nm, 600 nm, 650 nm and 700 nm under the illumination of 50 Lx, 100 Lx, 200 Lx, 300 Lx, 400 Lx and 500 Lx, respectively. An HPLC method was used to detect the cobamamide content after the irradiation, the contents and proportions of hydroxocobalamin and adenosine (two photodegradation products) were calculated and the two photodegradation products were confirmed by mass spectrum. Results: The main photodegradation products of cobamamide (impurity 1, adenosine and hydroxocobalamin) had the similar photodegradation tendency. Within the scope of 50 Lx 200 Lx, the illumination intensity affected the concentration ratio of hydroxocobalamin and adenosine obviously. Within the scope of 200 Lx 500 Lx, the illumination intensity showed smaller effect. Under the different wavelengths and photodegradation rate intensity, the content of hydroxocobalamin was higher than that of adenosine under the same experimental condition.Conclusion:This paper researched the cobamamide photodegradation products in the optimum dark condition. The method is accurate and reliable, which can be used for the control of photodegradation related substances of cobamamide.