Mohaček-Grošev, Vlasta; Brljafa, Sandro; Škrabić, Marko; Marić, ivan; Blažek Bregović, Vesna; Amendola, Vincenzo; Ropret, Polona; Kvaček Blažević, Anita (2022) Glucosamine to gold nanoparticles binding studied using Raman spectroscopy. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 264 . ISSN 1386-1425
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Abstract
The binding of glucosamine in water solutions of glucosamine hydrochloride mixed with clean colloidal gold nanoparticles obtained by laser ablation in liquid was studied using surface-enhanced Raman scattering (SERS), dynamic light scattering (DLS) and UV-VIS spectroscopy. The average size of dried gold nanoparticles was (20 ± 4) nm determined by averaging the sizes observed in transmission electron microscopy micrographs, which is smaller than the average size of gold nanoparticles in water solution as determined by DLS: (52 ± 2) nm. Upon adding the glucosamine solutions to gold colloid, average hydrodynamic diameter of ions was slightly larger for 0.1 mM glucosamine solution (55 ± 2 nm), while it increased to (105 ± 22) nm in the case of 1 mM solution, and was (398 ± 54) nm when 10 mM glucosamine solution was added. Most prominent Raman bands observed both for 0.1 mM and 1 mM glucosamine solutions were located at 1165 cm-1, 1532 and 1586 cm-1 and assigned to C-N coupled with C-C stretching, and C-NH3+ deformation angles bending. In SERS spectrum of 1 mM GlcN+ solution, two strong bands at 999 and 1075 cm-1 were found and attributed to C-Oring stretching coupled with C-NH3+ bending (999 cm-1) and to dominantly C-O stretching vibration. The differences in SERS spectra are attributed to different number of glucosamine molecules that attach to gold nanoparticles and their orientation with respect to the metal particle surface, partly due to presence of beta anomers protonated at anomeric oxygen position. The assignment of glucosamine bands was further corroborated by comparison with vibrational spectra of alpha and beta glucose and of polycrystalline powder of glucosamine hydrochloride. For all three substances comprehensive calculation of vibrational density of states was conducted using density functional theory. Benchmark bands for polycrystalline glucose anomers distinction are 846 and 915 cm-1 for alpha glucose, and 902 cm-1 for beta glucose. However, the bands observed in SERS spectra of 0.1 mM glucosamine solution at 831, 899, and 946 cm-1 or in 1 mM solution at 934 cm-1 cannot be easily identified as belonging either to alpha or beta glucosamine anomer, due to complexity of atomic motions involved.
| Item Type: | Article | ||||||||||||
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| Uncontrolled Keywords: | glucosamine; clean AuNPs; SERS; density functional theory; DLS; UV-VIS | ||||||||||||
| Subjects: | NATURAL SCIENCES > Physics > Atomic and Molecular Physics NATURAL SCIENCES > Chemistry NATURAL SCIENCES > Chemistry > Physical Chemistry |
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| Divisions: | Division of Materials Chemistry Division of Materials Physics |
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| Depositing User: | Vlasta Mohaček Grošev | ||||||||||||
| Date Deposited: | 06 Apr 2023 14:11 | ||||||||||||
| URI: | http://fulir.irb.hr/id/eprint/6808 | ||||||||||||
| DOI: | 10.1016/j.saa.2021.120326 |
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