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- W2745769275 abstract "This chapter presents a method for the preparation of pure solid vitamin B12r from methylcobalamin, the simplest alkylcobalamin. This substance is useful in investigating enzymatic reactions or their model reactions involving vitamin B12 because the absorption spectrum of vitamin B12r or a substance having analogous spectroscopic properties often has been observed during the course of enzymatic reactions, such as biosynthesis of methionine and of 5´deoxyadenosylcobalamin. The chapter discusses the properties of solid vitamin B12r. Solid vitamin B12r is obtained as a dark brown amorphous powder. Solid vitamin B12r thus obtained is fairly stable to oxygen in the dry state. Even after several months of storage over silica gel under a reduced pressure of 10 mm Hg, it gives an absorption spectrum characteristic of vitamin B12r, when dissolved in water or ethyl alcohol. Vitamin B12r is sensitive to oxygen in the presence of moisture and on standing in the atmosphere turns slowly to dark red, yielding aquocobalamin. This substance is paramagnetic, and its electron spin resonance spectrum is essentially identical with that of vitamin B12r in water." @default.
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- W2745769275 date "1971-01-01" @default.
- W2745769275 modified "2023-09-26" @default.
- W2745769275 title "[206] Preparation of solid vitamin B12r by anaerobic photolysis of methylcobalamin" @default.
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- W2745769275 doi "https://doi.org/10.1016/s0076-6879(71)18007-x" @default.
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