Raman and infrared spectroscopy of carbohydrates: A review

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 185; pp. 317 - 335
• Main Authors: Wiercigroch, Ewelina, Szafraniec, Ewelina, Czamara, Krzysztof, Pacia, Marta Z., Majzner, Katarzyna, Kochan, Kamila, Kaczor, Agnieszka, Baranska, Malgorzata, Malek, Kamilla
• Format: Journal Article
• Language: English
• Published: England Elsevier B.V 05.10.2017
• Subjects: ATR FT-IR; Carbohydrates; Carbohydrates - analysis; Carbohydrates - chemistry; FT-Raman; Saccharides; Spectrophotometry, Infrared; Spectrum Analysis, Raman; Sugars; Vibrational analysis; Carbohydrates; ATR FT-IR; Vibrational analysis; FT-Raman; Sugars; Saccharides
• ISSN: 1386-1425; 1873-3557
• DOI: 10.1016/j.saa.2017.05.045

Carbohydrates are widespread and naturally occurring compounds, and essential constituents for living organisms. They are quite often reported when biological systems are studied and their role is discussed. However surprisingly, up till now there is no database collecting vibrational spectra of carbohydrates and their assignment, as has been done already for other biomolecules. So, this paper serves as a comprehensive review, where for selected 14 carbohydrates in the solid state both FT-Raman and ATR FT-IR spectra were collected and assigned. Carbohydrates can be divided into four chemical groups and in the same way is organized this review. First, the smallest molecules are discussed, i.e. monosaccharides (d-(−)-ribose, 2-deoxy-d-ribose, l-(−)-arabinose, d-(+)-xylose, d-(+)-glucose, d-(+)-galactose and d-(−)-fructose) and disaccharides (d-(+)-sucrose, d-(+)-maltose and d-(+)-lactose), and then more complex ones, i.e. trisaccharides (d-(+)-raffinose) and polysaccharides (amylopectin, amylose, glycogen). Both Raman and IR spectra were collected in the whole spectral range and discussed looking at the specific regions, i.e. region V (3600–3050cm−1), IV (3050–2800cm−1) and II (1200–800cm−1) assigned to the stretching vibrations of the OH, CH/CH2 and C-O/C-C groups, respectively, and region III (1500–1200cm−1) and I (800–100cm−1) dominated by deformational modes of the CH/CH2 and CCO groups, respectively. In spite of the fact that vibrational spectra of saccharides are significantly less specific than spectra of other biomolecules (e.g. lipids or proteins), marker bands of the studied molecules can be identified and correlated with their structure. [Display omitted] •A description of Raman and IR features of 14 carbohydrates is given.•FT-Raman and ATR FT-IR spectra of solids are collected and assigned in detail.•Applications of vibrational spectroscopy in detection and quantification of carbohydrates are shown.