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[求助] 多糖结构相关的英文文献翻译为中文，千万千万不要用软件呦~

Studies usingIR spectroscopy indicated that the F1, F3, and F4 fractions demon-strate characteristics of the O S O stretching vibration of sulphateesters, as determined through the observation of strong absorptionbands at 1260–1640 cm−1. Synytsya et al. (2010) studied fucoidanextracts from the sporophyll of U. pinnatifida and revealed a very intense and broad IR band at 1256 cm−1, corresponding to a strongRaman band at 1269 cm−1, which was attributed to the asym-metric O S O stretching vibration of sulphate esters with somecontribution from the COH, CC, and CO vibrations. The IR bandof the F3 and F4 fractions also exhibited adsorptions at approxi-mately 817 and 850 cm−1, which indicates the presence of sulphategroups at positions 2 and 4, respectively. Bilan et al. (2006) obtainedsimilar findings for the fucoidan extracted from F. serratus L. The13C NMR spectra of F1–F4 were complex. Intense signals wereobserved in the anomeric C1 region, and the spectra of F1, F3,and F4 also appeared to have signals in the high-field region of16.5–18.5 ppm, which are due to -l-fucopyranoside (Bilan et al.,2006; Vishchuk et al., 2011). This finding agrees with the results obtained by Imbs et al. (2009), who illustrated that the13C NMRspectrum of the fucoidan from Costaria costata exhibits a signalat 16.9 ppm, which was assigned to the CH3group of fucopyra-nose. The spectra of F2 were different from those of F1, F3, and F4,and no signal was observed in the high-field regions; instead, these spectra exhibited a signal at 100.4 ppm, which may indicate thepresence of mannopyranose (Bilan et al., 2006; Zhang, 1999). F1,F3, and F4 showed complex signals of pyranoid ring carbons C2–5in the region of 65–83 ppm, which indicates the complex struc-tural patterns of the monomer composition and their glycosylation,sulphation, and/or O-acetylation substitutions. In contrast, the cor-responding signals of F2 appeared to exhibit much clearer peaks,indicating the lack of sulphation substitution.

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