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. Author manuscript; available in PMC: 2019 Oct 1.

Published in final edited form as: Anal Bioanal Chem. 2018 Jul 31;410(26):6881–6889. doi: 10.1007/s00216-018-1288-z

Fig. 5 — UV-induced degradation of Des- Degradation of Des was studied by irradiating the sample to UV light at 254 nm for different time intervals (0, 5, 15, 30 and 60 minutes). (a) Represents the MS² spectra of UV-irradiated Des mixed with 25 ng/μL of Labeled-Des. The fragment ion generated from Des (decrease with time) and Labeled-Des are highlighted in orange and blue box respectively. (b) Represents the UV-induced breakdown by measuring concentration of Des at different time intervals using MALDI-MS² and NMR spectroscopy

Fig. 5 — UV-induced degradation of Des- Degradation of Des was studied by irradiating the sample to UV light at 254 nm for different time intervals (0, 5, 15, 30 and 60 minutes). (a) Represents the MS² spectra of UV-irradiated Des mixed with 25 ng/μL of Labeled-Des. The fragment ion generated from Des (decrease with time) and Labeled-Des are highlighted in orange and blue box respectively. (b) Represents the UV-induced breakdown by measuring concentration of Des at different time intervals using MALDI-MS² and NMR spectroscopy