Surface functionalization of bioactive glasses with natural molecules of biological significance, part II: Grafting of polyphenols extracted from grape skin

Gallic acid grafting to a ferrimagnetic bioactive glass-ceramic

“…This result confirmed what previously observed by some of the authors by means of XPS analyses on bioactive glasses functionalized with gallic acid and natural polyphenols [34,45].…”

“…This behavior is due to the higher surface area exposed by powder samples. These results are in accordance with previous ones obtained on bioactive glasses functionalized with GA [34] and polyphenols from grape skin [45]. Surface roughness and topography affect the area exposed to the functionalization medium.…”

“…The change in pH can be attributed to the ion release of SC-45 glass ceramic in the functionalization solutions [13] and a similar behavior has been already observed by the authors for the surface functionalization of bioactive glasses with GA [34] and natural polyphenols [45]. A higher ion release is associated with powder samples due to their higher surface area compared to bulk ones.…”

Cellulose acetate membranes functionalized with resveratrol by covalent immobilization for improved osseointegration

“…7) high resolution spectra were recorded for all the samples. According to figure 6, C1s spectrum displays five different peaks located at 281, 286, 284, 288 and 287 eV attributed to C=O, C-O, C-C, C-N and C-O phenolic [49][50][51]. The first step of CA functionalization has been made to increase the number of OH available groups on CA surface and this could be observed by an increase of the intensity ratio between C-O and C-C (I C-O /I C-C ) in the C1s spectra of CA-OH.…”

“…A more detailed discussion can be made on O 1s highresolution spectra. In addition, O 1s spectrum ( Fig.7) can be deconvoluted to four peak centered at 533, 531, 529 and 536 eV assigned to OH, C=O, Si-O and C-O phenolic respectively [49][50][51]. After the initial hydrolysis of CA the highest intensity of C-O peak (in CA-OH spectra) suggest the increasing of HO groups.…”