Highly efficient synthesis and characterization of starch aldehyde-catechin conjugate with potent antioxidant activity

Study of mesquite grain flour ( Prosopis juliflora Sw. DC ) in hamburger storage

“…Similar to kaempferol, catechin is also a flavonoid that stood out in the MGF composition. Catechin has proven anticancer, anti‐inflammatory, antioxidants, antibacterial, and antiviral activities, but it is an unstable compound in external conditions (Hu et al, 2021). Aside from catechin, other phenolic compounds are, generally, unstable in the presence of light, oxygen, heat, and external conditions (Melo et al, 2020).…”

Horseradish peroxidase catalyzed grafting of chitosan oligosaccharide with different flavonols: structures, antioxidant activity and edible coating application

“…Antioxidant activity of flavonols, COS and COS–flavonol conjugates was evaluated by DPPH radical scavenging assay, ABTS radical scavenging assay and reducing power assay 31 . Typically, flavonols were dissolved in ethanol while COS and COS–flavonol conjugates were dissolved in acetic acid aqueous solution (10 mL L −1 ).…”

“…Total phenol content in the conjugates was measured by Folin-Ciocalteu assay. 31 Typically, 1 mL each conjugate aqueous solution (1 g L −1 ) was mixed with 1 mL of ten-fold diluted Folin-Ciocalteu reagent and shaken at 30 °C for 5 min, which was followed by reacting with 5 mL saturated sodium carbonate (NaCO 3 ) solution at 20 °C for 2 h. The reaction solution was recorded at 760 nm and the total phenol content in each conjugate was calculated based on the calibration curve developed from gallic acid. Results were expressed as milligram of gallic acid equivalents per gram of conjugate (mg GAE g −1 ).…”

“…Antioxidant activity of flavonols, COS and COS-flavonol conjugates was evaluated by DPPH radical scavenging assay, ABTS radical scavenging assay and reducing power assay. 31 Typically, flavonols were dissolved in ethanol while COS and COS-flavonol conjugates were dissolved in acetic acid aqueous solution (10 mL L −1 ). For DPPH radical scavenging assay, 1 mL flavonol solution (0.001-0.02 g L −1 ), COS solution (0.1-1 g L −1 ) and COSflavonol conjugate solution (0.1-1 g L −1 ) were individually reacted with 3 mL DPPH methanol solution (0.1 mmol L −1 ) at 30 °C for 30 min.…”

“…starch aldehydecatechin and starch aldehyde-QUE conjugates) presented blue spots at the baseline of TLC. 31,43 Ultraviolet (UV)-visible spectra The UV-visible spectra of flavonols, COS and COS-flavonol conjugates are exhibited in Fig. 3.…”