Laser-raman spectra of d-fructose in aqueous solution

Fructose and Pectin Detection in Fruit-Based Food Products by Surface-Enhanced Raman Spectroscopy

“…The positions of the main modes of crystalline fructose are labelled in the same figure and listed with their assignments in Table 1, where their relative intensities are also reported (the intensity of the strong mode at 627 cm −1 is taken as reference). The observed modes have characteristics that are in good agreement with those observed in the Raman spectra of fructose aqueous solutions reported in [44] even if unexpected high intensity and shift in the position are observed for the modes centered at 333, 1095 and 1370 cm −1 , assigned to C-O-C and C-O-H bending and CH 2 wagging, respectively [44]. In particular, the band centered at 330 cm −1 shows a large wavenumber shift decrease in comparison to the expected position (344 cm −1 ) and an intensity enhancement.…”

Raman spectroscopy offers great potential for the nondestructive confirmatory identification of body fluids

“…For example, the very strong peak at 760 cm À1 in the canine spectrum is due to the presence of tryptophan in an undetermined protein [35], while this protein is present in the human sample in a lower concentration. Another peak at 1061 cm À1 from a combination of glucose [36] and fructose [37] is very strong in the canine sample and barely evident in the human sample. The human sample shows higher contribution from lactate based on the larger relative intensities of the 536, 829, and 1452 cm À1 peaks.…”

Raman spectra of fructose and glucose in the amorphous and crystalline states

“…Although Raman spectroscopy has been used in studies of food materials for various purposes, 4 we have found no Raman spectra of amorphous sugars in the literature. However, Raman spectra of D-glucose 3,5 -9 and D-fructose 3,7,8,10 and similar molecules 11,12 in their aqueous solution and in the crystalline phase 13,14 as well as IR spectra of several of these carbohydrates 15 -23 have been reported. Band assignments in those studies were based on extensive normal coordinate calculations.…”