Abstract
The methanol spectra of flavones and flavonols exhibit two major absorption peaks in the region 240 – 400 nm1. These two peaks are commonly referred to as Band I (usually 300 – 380 nm, Table V-1 records the λmaxvalues for Band I for all flavones and flavonols examined in the present investigation), and Band II (usually 240 – 280 nm). Band I is considered to be associated with absorption due to the B-ring cinnamoyl system, and Band II with absorption involving the A-ring benzoyl system (see III) [1].
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Mabry, T.J., Markham, K.R., Thomas, M.B. (1970). The Ultraviolet Spectra of Flavones and Flavonols. In: The Systematic Identification of Flavonoids. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-88458-0_5
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DOI: https://doi.org/10.1007/978-3-642-88458-0_5
Publisher Name: Springer, Berlin, Heidelberg
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