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. 2019 Dec 18;412(3):533–537. doi: 10.1007/s00216-019-02327-7

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© The Author(s) 2019

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Fig. 2 — a Chemical structure and SNFG representation of the investigated synthetic, sulfated (highlighted in red) hyaluronic acid (SHA) derivative. b Cryogenic IR spectroscopy in helium nanodroplets of the non-sufated hyaluronic acid (HA) as [HA-2H]²⁻ (upper panel) and the 2SHA derivative as [2SHA-2H]²⁻ (lower panel). Absorption bands corresponding to sulfate groups are highlighted with red squares. c Cryogenic IR spectroscopy in helium nanodroplets of the non-sufated HA as [HA-H]⁻