Theories of the biogenesis of flavonoid compounds

Geissman, T. A.; Hinreiner, Elly

doi:10.1007/bf02960588

Cited by 120 publications

(34 citation statements)

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“…The band I is due to the transition localized within the B ring of cinnamoyl system (with the 3C-OH group), and the band II is consistent with the absorbance of the ring A of benzoyl system (with the 5C-OH group). They are related to the p-p * transitions [26,27] and have high absorption coefficients (e), Table 3.…”

Section: Resultsmentioning

confidence: 99%

New sulfonic derivatives of quercetin as complexing reagents: synthesis, spectral, and thermal characterization

Woźnicka

Pieniążek

Zapała

et al. 2014

J Therm Anal Calorim

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The synthesis conditions of quercetin-8-sulfonic acid and sodium salt of sulfonated quercetin were determined. The molecular formulae of obtained compounds are: C 15 H 10 O 10 SÁ4H 2 O and C 15 H 9 O 10 SNaÁ4H 2 O. On the basis of spectral methods UV-Vis, IR, and 1 H NMR it was stated that the sulfonation of quercetin occurs at 8-C position of the A ring. The complexing properties of Na-QSA-8 were confirmed by synthesis of a solid complex with Fe(II) ions. The NaQSA-8 formed a complex with Fe(II) ions at pH 5 with the metal excess (c M :c L = 7:1). The chelation site was analyzed using spectroscopy methods. It was found that chelation of the metal ions occurs at the 4C=O, 3-OH and 3 0 -OH, and 4 0 -OH sites of the molecule NaQSA-8. Thermal decomposition of the compounds was carried out in air and nitrogen gas carries. The TG-FTIR-MS technique was employed to study decomposition pathway. The dehydration process was discussed in relation to of the nature of water contained in the compounds.

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Section: Resultsmentioning

confidence: 99%

New sulfonic derivatives of quercetin as complexing reagents: synthesis, spectral, and thermal characterization

Woźnicka

Pieniążek

Zapała

et al. 2014

J Therm Anal Calorim

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show abstract

“…It appears more plausible that both compounds are formed in parallel, since leuco-anthocyanin accumulates in the flowers irrespective of anthocyanin formation. This opinion has been put forward from other kinds of experiments by several authors, as reviewed by Blank (1947), Geissman and Hinreiner (1952) and Paech (1955).…”

Section: Discussionmentioning

confidence: 87%

Leuco-anthocyanin in Variable Flowers of <i>Camellia japonica</i>

Endô

1958

The Japanese journal of genetics

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“…Low activity (1)(2)(3)(4)(5), moderate activity (6-10), high activity (11)(12)(13)(14)(15), very high activity (16)(17)(18)(19)(20), no activity (--)…”

Section: Resultsmentioning

confidence: 99%