Hidalgo María Eliana, Farah Miguel, Carrasco Leonardo, Fernández Ernesto
Chemistry and Biology Institute, Faculty of Sciences, University of Valparaíso, Chile.
J Photochem Photobiol B. 2005 Jul 1;80(1):65-9. doi: 10.1016/j.jphotobiol.2005.01.005. Epub 2005 Apr 18.
Boldine hydrochloride was more photounstable than boldine after irradiation with UVB (lambda = 300 nm). However, photoconsumption quantum yields, for glaucine hydrochloride (6.5 x 10(-2)) and boldine hydrochloride (6.7 x 10(-2)) in air, were quite similar. The photolysis was oxygen dependent in both cases, and the effect over the kinetics after the addition of 2,2,6,6-tetramethyl-1-piperidinyloxy suggested free radicals participation. The fact that the antioxidative capacity of boldine and boldine hydrochloride did not change during the photolysis, suggests that the phenolic structure remains unchanged in the photoproducts, corroborated with the photoproducts analysis. The photoprotection capacity was evaluated before and after irradiation. Results indicate that the values before irradiation are similar for all three compounds, only glaucine increasing its capacity with length of irradiation time.
在经紫外线B（波长λ = 300 nm）照射后，盐酸波尔定比波尔定更易发生光不稳定现象。然而，盐酸青藤碱（6.5×10⁻²）和盐酸波尔定（6.7×10⁻²）在空气中的光消耗量子产率相当相似。在这两种情况下，光解均依赖于氧气，并且在添加2,2,6,6 - 四甲基 - 1 - 哌啶氧基后对动力学的影响表明有自由基参与。波尔定和盐酸波尔定在光解过程中抗氧化能力未发生变化这一事实，表明酚类结构在光产物中保持不变，这与光产物分析结果相符。在照射前后对光保护能力进行了评估。结果表明，照射前所有三种化合物的值相似，只有青藤碱的能力随照射时间延长而增加。
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