Correlation between antiradical activity and stability of betanine from Beta vulgaris L roots under different pH, temperature and light conditions

Abstract

When the antiradical activity and stability of betanine were studied at pH values of 3.5 and 8.5 and temperatures of 25, 50 and 75°C, the results showed that the antiradical activity was greater at acidic pH and lower at higher temperatures. At basic pH the activity of betanine correlated well with its stability at the three temperatures assayed, suggesting that the degradation products, betalamic acid (BA) and cyclo DOPA 5-O-b-D-glucoside (CDG), did not contribute to this activity under the experimental conditions used. However, at acidic pH the degradation product, CDG, did seem to contribute to the antiradical activity. Furthermore, at pH 3.5, betanine stability was so great that light conditions had no effect on the antiradical activity. At basic pH, too, light had no effect on betanine activity owing to the high instability of the pigment.

Encapsulation, Properties, and Thermal Study of Red Biocolorant from Selected Plants Obtained Through Physical Extraction

“…However, the dominance of anthocyanin groups might not be appeared in the encapsulated red biocolorant from red spinach. According to [24], the stability of betanine fraction from beetroot had great stability at pH 3.5, even also signifying greater antiradical activity which not easily degraded under illumination treatment, being in line with our detection. In addition, it was supposed that the natural acidic environment of dragon fruit (pH 5) should be most favorable to retard degradation of its pigments.…”

Physiological Roles of Betacyanin in a Halophyte,Suaeda japonicaMakino

“…Similarly, betalains serve as free radical scavengers and prevent active oxygen-induced and free radical-mediated oxidation of biological molecules (Pedreño and Escribano, 2001). For instance, betanin and betanidin extracts from Beta vulgaris inhibited lipid peroxidation caused by metmyoglobin or lipoxygenase activity, the peroxidation of microsomes from turkey muscle tissue, and the oxidation of low-density lipoproteins (LDL) of human blood (Kanner et al, 2001).…”

The Effect of Electrolyte on Dye Sensitized Solar Cells Using Natural Dye from Mango (<i>M. indica</i> L.) Leaf as Sensitizer

“…The highest intensity occurs at pH2.16 with a value of 2.936, which is higher than 2.880 at 220 nm for pH 5.20 at short wavelength range (Figure 3). The lowest absorption intensity in long wavelength is observed for dye at pH 2.16, indicating a degradation of the M. indica L. dye in strong acidic medium [18], at higher temperatures. Dye extract at pH of 2.58 shows a broad absorption peak in the 303 -400 nm range due to π − π * transitions due to the O-H phenolic bond [20], which has a high concentration with a specific absorbance peak of 3392.90 nm (Figure 4) and broad appearance.…”

“…The dye with pH2.58 has the highest J sc of 1.30 mA/cm 2 and fill factor of 0.8. The temperature increase reduced the J sc of the dye at 2.16, the band gap is smaller as more electrons are excited and have high kinetic energy, and it also has the lowest fill factor, the resulting lupeol degradation in very strong acidic environment [18] causes poor harvesting of solar energy by the dye when injected on the TiO 2 [21]. The photoelectric parameters are shown on Table 3.…”