Spectroscopic techniques applied to the characterization of decorated potteries from Caltagirone (Sicily, Italy)

Improvement of the stability and activity of immobilized trypsin on modified Fe3O4 magnetic nanoparticles for hydrolysis of bovine serum albumin and its application in the bovine milk

“…The presence of MNPs can be confirmed by two strong absorption bands at around 530 cm À1 and 623 cm À1 (Ma et al, 2003). The spectrum (a) demonstrates the characteristic strong absorption bands at 530 cm À1 , which comes from FeAO typical vibrations of iron oxide (Barilaro et al, 2005). Comparing with Fig.…”

Characterization and immobilization of trypsin on tannic acid modified Fe3O4 nanoparticles

“…The presence of MNPs can be seen by two strong absorption bands at around 632 and 585 cm −1[37,38]. The spectrum (a) shows the only characteristic strong absorption bands at 561 cm −1 , 1396 cm −1 and 1630 cm −1 which come from vibrations of Fe O bonds and one typical for iron oxide[39].The spectrum (b) is different from the spectrum (a) between 1000 cm −1 and 1700 cm −1 absorption bands. The C O group can be seen from the spectrum (b) at around 1706 cm −1 .…”

New insights in technology characterization of medieval Valencia glazes

“…[10,[12][13][14][15][16][17] Archeometric studies of ceramics have allowed identification of their intricate chemical composition, raw materials and manufacturing methods including elucidation of firing temperatures. [18][19][20][21][22] Characterization of glazes is challenging due to their complex disordered nanostructure, which is thermodynamically unstable with no crystallographic restrictions or stoichiometric ratios. Moreover, it is worth noting that glaze recipes are variable, both in terms of raw materials and available technologies among cultures, historical periods, and workshops.…”

“…[2,4,5,10,[15][16][17][18]20,24,29,30] The analytical characterization of glazes and luster has been performed using an array of analytical techniques. [3][4][5]10,19,20,22,23,25,26,29,31,32] Particularly, Fourier-transformed infrared spectroscopy (FTIR) and Raman microscopy (RM) are exceptionally apt to explain their complex composition, offering molecular information (in a non-destructive way with high spatial resolution) that retrieve knowledge about production process. [20,23,25,26,[31][32][33] Specifically the polymerization index (Ip) and different spectral components (Q n for stretching components and Q n' for bending ones) derived from Raman spectra are used to clarify glass composition and nanostructure such that they serve as a parameter for unraveling firing temperatures.…”

“…[21,22] However, in spite of the well documented archeological and scientific benefits obtained from applying vibrational techniques to characterize Muslim-glazed, Italianglazed, Ottoman-glazed, Iznik-glazed, Majolica-glazed or Vietnamese-glazed ceramics, among others and to our knowledge, glazes and lusters of Valencian ceramics have not been studied by means of RM. [19,32,[34][35][36][37] Consequently, this paper focuses on applying RM combined with scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) to improve information concerning coloring recipes (pigment compositions) and manufacturing processes (e.g., firing temperatures) of glazes and lusters of 14th and 15th ceramics workshops from Manises and Paterna (Valencia, Spain). This will help unravel changes in coloring processes and establishing a chronology for the ceramics.…”