Chromatographic Separation of Tannin Rich Plants and Characterization of Compounds Using Analytical Techniques

Anburaj, Rajeswari

doi:10.20959/wjpr20176-8537

Cited by 1 publication

(1 citation statement)

References 13 publications

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“…To confirm successful synthesis of T-CQDs, absorbances of tannic acid and T-CQDs were compared. Tannic acid has only one peak at 275 nm attributed to aromatic ring and C=O groups (figure S5) [44], whereas T-CQDs has two peaks at 235 and 290 nm corresponding to π-π * transition of aromatic sp 2 C=C bonds and n-π * transition of C=O bond, respectively (figure 2(a)) [45,46]. Therefore, it was concluded that the T-CQDs were successfully carbonized by the microwave-assisted pyrolysis.…”

Section: Optical Properties Of the T-cqdsmentioning

confidence: 98%

Antioxidant and anti-aging carbon quantum dots using tannic acid

Son¹,

Park²,

Jung³

2021

Nanotechnology

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Overexpression of collagenase, elastase, and tyrosinase is caused by external factors such as ultraviolet (UV) radiation and stress, resulting in wrinkle formation and freckles through the loss of skin elasticity and skin pigmentation. In this study, we developed novel carbon quantum dots (CQDs) with antioxidant and anti-aging properties using tannic acid as a carbon source through a simple microwave-assisted pyrolysis method. The synthesized tannic acid-derived CQDs (T-CQDs) showed bright blue fluorescence (QY = 28.2 ± 4.0%), exhibiting maximum emission at 430 nm under 350 nm excitation. Even though small amount of the T-CQDs (3 μg ml−1) was used, they exhibited excellent free radical scavenging ability (82.8 ± 4.3%). Also, the T-CQDs (10 μg ml−1) revealed remarkable inhibitory activity against skin aging-related collagenase (77.6 ± 4.8%), elastase (52.6 ± 1.0%), and tyrosinase (44.2 ± 1.3%), demonstrating their antioxidant and anti-aging effects. Furthermore, their antioxidant and anti-aging properties were superior to those of tannic acid, L-ascorbic acid, and quercetin used as positive controls. Finally, the T-CQDs effectively suppressed UV-induced reactive oxygen species generation by 30% at the cellular levels and showed high cell viability (99.7 ± 0.8%) even at 500 μg ml−1. These results demonstrate that the T-CQDs with superior antioxidant, anti-aging properties, and low cytotoxicity can be utilized as novel anti-aging materials in cosmetic and nanomedicine fields.

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Section: Optical Properties Of the T-cqdsmentioning

confidence: 98%