A complete characterization of the vibrational spectra of sucrose

Stabilities of aqueous solutions of sucrose containing ascorbic and citric acids by using FTIR spectroscopy and physicochemical studies

“…6 shows for the four AA solutions the variations of the IR spectra recorded on the first day and at the 92nd day. During the first day of preparation of the solutions, in the region of higher wavenumber it is observed that when the dilution increases the bands at 3409 cm − 1 undergo widening due to the formation of H bonds and to the decomposition of this acid in ascorbate ions and in the oxidized A species, as indicated in Table 6 [16][17][18]. The most important changes in the region between 1800 and 400 cm − 1 are, for example, the intensities of the two bands at 1753 (C_O stretching) and 1672 cm −1 (C_C stretching) change notably from solution 1 to solution 4, thus, the first band decreases with hydration while the other one increases their intensity.…”

“…We believe that with the aid of a model orange juice which is prepared with the ascorbic and citric acids and sucrose in the same proportions that as orange fruit [10,11] it is possible to know the profile of the infrared spectrum of these mixtures and, this way, it is possible to perform by simulation the completed assignments of the bands observed in the natural orange juices. The assignments reported in the literature for ascorbic and citric acids and sucrose in solution [12][13][14][15][16] would allow us the assignments of the bands observed in the IR spectra of the mixtures in order to avoid falsifications or adulterations in the final products by means of a quick technique, as is the FTIR spectroscopy. Nowadays, it is possible to identify the bands of each component in mixtures of ascorbic and citric acids and sucrose in water by combining the infrared spectrum together with studies simultaneous of their physicochemical properties with the storage time.…”

Ultrafast imaging Raman spectroscopy of large-area samples without stepwise scanning

“…The rolling circle method (Brandt et al, 2006) was applied to remove background. The spectra reveal that the sugar piece consists of sucrose (Brizuela et al, 2012). The pseudo color plots illustrate the intensity of the strongest Raman signal at 850 cm −1 (CH 2 twisting).…”

Vibrational characterization of monomers and dimers of cellulose by using DFT calculations and the SQM methodology

“…Taking into account that the equations are generally known these were presented as supporting material. The force fields were computed only for the monomeric species by using the SQMFF methodology [38] and the Molvib program [39] while the internal coordinates for those cellulose species were taken of those reported for carbohydrate compounds with similar rings [55][56][57][58] and, for this reason, these were not presented in this work. The complete vibrational assignments of the monomeric cellulose structures were performed taking into account the potential energy distribution components (PED) 10% while for the dimeric species the GaussV iew program [40] was used as an aid to perform the assignments.…”

“…The complete vibrational assignments of the monomeric cellulose structures were performed taking into account the potential energy distribution components (PED) 10% while for the dimeric species the GaussV iew program [40] was used as an aid to perform the assignments. After that, the calculated properties for α-and β-cellulose species were analyzed and compared later with those properties reported for some compounds with similar rings, such as some carbohydrates [55][56][57][58].…”