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165 results for “anthocyanins”
Fig. 6 in Identification of anthocyanin and other flavonoids from the green-blue petals of Puya alpestris (Bromeliaceae) and a clarification of their coloration mechanism
Fig. 6. Spectra and colors of the crude extracts obtained from the petals of Puya alpestris. 5% Formic acid extracts were evaporated and dissolved in two McIlvaine buffer solutions (pH 5.6 and 6.2). UV–vis absorption spectra of the (A) tip and (B) base. (C) UV–vis absorption spectra of the 50% acetone and McIlvaine buffer mixture (pH 6.2) extract of the petal tip. (D) Photographs of the solutions of A and C. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)
Fig. 2 in Identification of anthocyanin and other flavonoids from the green-blue petals of Puya alpestris (Bromeliaceae) and a clarification of their coloration mechanism
Fig. 2. (A) The magnitude of the deuterium induced 13C NMR shift observed in myricetin 3,3′,5′-tri-O-glucoside (2) and (B) their corresponding shift values (Δδ) reported in ppm.
Fig. 17 in Chemical evolution of the colour systems generated by riccionidin A, 3-deoxyanthocyanidins and anthocyanins
Fig. 17. Chromatographic profile (at 300 nm) of flavylium salt (compound 8) solution (methanol:water 1:1; 1.15 mM) after a pH jump to pH = 5.8 and at 45 °C. a) after 10 min; b) after 20 min; c) after 1 h; d) after 2 h; e) after 4 h; f) after 8 h; g) after 24 h; h) after 33 h; c) after 48 h.
Fig. 16 in Chemical evolution of the colour systems generated by riccionidin A, 3-deoxyanthocyanidins and anthocyanins
Fig. 16. Kinetics of the direct pH jumps from flavylium cation at pH = 1.0 at room temperature, [AH+] = 3.3 × 10−5 M.
Fig. 15 in Chemical evolution of the colour systems generated by riccionidin A, 3-deoxyanthocyanidins and anthocyanins
Fig. 15. Top: proposed deprotonation sequence for flavylium cation of riccionidin A; bottom: colour of the flavylium cation and quinoidal bases of riccionidin A immediately after the respective preparation. Only at extremely basic pH values a bluish-purple colour is observed. No blue colour like those of ionized quinoidal bases in anthocyanins was achieved. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
Fig. 14 in Chemical evolution of the colour systems generated by riccionidin A, 3-deoxyanthocyanidins and anthocyanins
Fig. 14. (a) Spectral variations of riccionidin A taken immediately after direct pH jumps from the flavylium cation equilibrated at pH = 1.0. The system behaves as a tetra-protic acid with pKa1 = 4.2; pKa2 = 6.6; pKa3 = 7.7; pKa4 = 10.7; (b) pH dependent mole fraction distribution of the several species.
Fig. 12 in Chemical evolution of the colour systems generated by riccionidin A, 3-deoxyanthocyanidins and anthocyanins
Fig. 12. (a) Irradiation of trans-chalcone at 366 nm in acetonitrile (with a drop of TFA); [Ct] = 3.4 × 10 −5 M; (b) Chromatographic profile of trans-chalcone solution (4) in acetonitrile (0.66 mM) at 300 nm. a) before irradiation; b) after 6 min of irradiation (366 nm); c) after 16 min of irradiation (366 nm); d) after 35 min of irradiation (366 nm); e) after 1 h of irradiation (366 nm); f) after 1 h and 35 min of irradiation (366 nm); f) after 2 h and 40 min of irradiation (366 nm); g) after 3 h and 40 min of irradiation (366 nm).
Fig. 11 in Chemical evolution of the colour systems generated by riccionidin A, 3-deoxyanthocyanidins and anthocyanins
Fig. 11. (a) Chromatographic profile of trans-chalcone (4) in methanol:water 1:1 (0.5 mM, pH = 7.1) at 300 nm. a) freshly prepared; (b) after 4 days at r. t.; c) after 10 days at r. t. m/z = 301 (negative mode) for peaks 3, 4 and 7; m/z = 319 (negative mode) for peak 1; m/z = 337 (negative mode) for peak 2; m/z = 154 (negative mode) for peak 5; m/z = 617 (negative mode) peak 6.
Fig. 13 in Chemical evolution of the colour systems generated by riccionidin A, 3-deoxyanthocyanidins and anthocyanins
Fig. 13. pH dependent spectral modifications of riccionidin A, [AH+] = 3.3 × 10−5 M upon pH jumps from pH = 1.0 to higher pH values in the following pH intervals: (a) 1.2
Fig. 10. Proposed chemical structures for peaks 1, 2, 5 and 6 in Chemical evolution of the colour systems generated by riccionidin A, 3-deoxyanthocyanidins and anthocyanins
Fig. 10. Proposed chemical structures for peaks 1, 2, 5 and 6 detected by HPLC-MS and possible mechanistic pathways leading to their formation. The position of the methyl group was randomly assigned in the structure from peak 6.
Fig. 8 in Chemical evolution of the colour systems generated by riccionidin A, 3-deoxyanthocyanidins and anthocyanins
Fig. 8. Proposed protonation sequence for the trans-chalcone species. The numeration of the flavylium cation was used for comparison purposes.
Fig. 9 in Chemical evolution of the colour systems generated by riccionidin A, 3-deoxyanthocyanidins and anthocyanins
Fig. 9. (a) Spectral variations of the trans-chalcone at pH = 5.0 in methanol:water (1:1) at 45 °C, [Ct] = 5.0 × 10−5 M. The same behaviour is observed in the pH range 1
Fig. 7 in Chemical evolution of the colour systems generated by riccionidin A, 3-deoxyanthocyanidins and anthocyanins
Fig. 7. (a) Spectral variations during the synthesis of riccionidin A; (b) Spectral variations of trans-chalcone (immediately after the pH jump) as a function of pH, [Ct] = 5.8 × 10−5 M; (c) Respective titration curves.
Fig. 5 in Chemical evolution of the colour systems generated by riccionidin A, 3-deoxyanthocyanidins and anthocyanins
Fig. 5. (a) pH 1.0, [Ct] = 2.5 × 10−5 M; the curves correspond to the irradiation times 0.0.5, 1, 2, 4, 7 and 12 min; λ= 365 nm; (b) Spectral variations of 4′- exc methoxyflavylium at pH = 7.0, [Ct] = 3.2 × 10−5 M; the curves correspond to the irradiation times 0, 0.25, 1.5, 3, 6, and 10 min; λ= 365 nm; (c) Energy level exc diagram of 4′-methoxyflavylium. Adapted from reference (Pina et al., 1997).
Fig. 3 in Chemical evolution of the colour systems generated by riccionidin A, 3-deoxyanthocyanidins and anthocyanins
Fig. 3. (a) Representation of the rate constants versus pH of the second step for Oenin 2.5 × 10−5 M, eq. (5); (b) the same for the third step, which is much slower, eq. (7). The rate and equilibrium constants to represent eq. (5) and eq. (7) were taken from reference (Pina et al., 2019); (c) colours of 5.7 × 10−5 M Oenin multistate (1) Flavylium cation at pH = 1.0; (2) quinoidal base immediately after a direct pH jump to pH = 5.0; (3) at the equilibrium for the same pH of (2); (4) the intense blue is given by the anionic form of the quinoidal base as shown immediately after a pH jump to pH = 8.0. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
Fig. 2 in Chemical evolution of the colour systems generated by riccionidin A, 3-deoxyanthocyanidins and anthocyanins
Fig. 2. (a) Thermodynamic energy level diagram of malvidin-3-glucoside (oenin), 2 × 10−5 M showing the three kinetic steps upon a direct pH jump are shown; (b) mole fraction distribution of the species AH+ and the neutral forms A, B, Cc and Ct at equilibrium.
Fig. 1. Anthocyanins, 3 in Chemical evolution of the colour systems generated by riccionidin A, 3-deoxyanthocyanidins and anthocyanins
Fig. 1. Anthocyanins, 3-deoxyanthocyanins, auronidin and their respective aglycones together with two riccionidin A synthetic models (Glc = Glucose or other sugars, in the case of the reported auronidin is neohesperidoside) (Berland et al., 2019).The scope of this work is to investigate the kinetics and thermodynamics of the multistate of riccionidin A (liverworts colorant) and compare with the similar multistates reported for 3-deoxyanthocyanidins (mosses and ferns colorants) and anthocyanins (angiosperms colorants).
Urinary Excretion of Anthocyanins During Long Term Blueberry Feeding
ClinicalTrials.gov study NCT01789359. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Purified Anthocyanin and Nonalcoholic Fatty Liver Disease
ClinicalTrials.gov study NCT01940263. IPD Sharing: Not stated. Countries: 1. Publications: 2.
Study of Oral Anthocyanins on Insulin Resistance
ClinicalTrials.gov study NCT01180712. IPD Sharing: Not stated. Countries: 1. Publications: 4.
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