Spectroscopic investigation of the interaction between β-cyclodextrin and ascorbic acid

A facile “green” synthesis of ascorbic acid-capped ZnSe nanoparticles

“…Comparatively, the IR spectra of the as-synthesised materials show gradual shift to higher frequency as well as a decrease in the intensities as the pH increases. This frequency shift had been assigned to the breaking of ascorbic acid hydrogen bond and formation of ascorbate ions as the pH increases [26,45]. Similar decrease in the intensity of OH band as the pH increases had also been observed by Chen et al, and was attributed to the deprotonation of ascorbic acid [25].…”

“…Ascorbic acid known as antiscorbutic vitamin, an effective antioxidant was used as capping agent because, being a very effi- cient oxygen scavenger, it will improve photochemical stability and reduce cytotoxicity that might arise from photodegradation, which is a major limitation for biological applications of QDs [18,[24][25][26]. As a water-soluble vitamin its hydroxyl groups are expected to facilitate complexation of metal ions and solubilisation of the assynthesised nanoparticles in water [18,26,27]. In addition it can also acts as conjugating agent for the attachment of materials to biomolecules that can increase the solubility and improve the drug delivery rate of bioactive substances [24][25][26].…”

“…As a water-soluble vitamin its hydroxyl groups are expected to facilitate complexation of metal ions and solubilisation of the assynthesised nanoparticles in water [18,26,27]. In addition it can also acts as conjugating agent for the attachment of materials to biomolecules that can increase the solubility and improve the drug delivery rate of bioactive substances [24][25][26].…”

Antioxidant Activities of Curcumin and Ascorbyl Dipalmitate Nanoparticles and Their Activities after Incorporation into Cellulose-Based Packaging Films

“…The ADP films had a high frequency region with C−O about 1000−1300 cm −1 for determining the functional group of ester at 1176−1179 cm −1 (Figure 13). 57 In this work, Ccm-NPs and ADP-NPs were successfully produced in a single step using the RESOLV technique. Ccm-NPs and ADP-NPs stabilized in either Pluronic F127 or methyl cellulose solution were well-dispersed, spherical, and individual NPs with average sizes of ∼50 and ∼80 nm, respectively.…”

“…A very clear band at 1469 cm –1 was assigned to deformation vibrations of the two methyl groups. The ADP films had a high frequency region with C–O about 1000–1300 cm –1 for determining the functional group of ester at 1176–1179 cm –1 (Figure ) …”