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FTIR spectra of CL, SLs and HPLC-purified SLs from NT, NS, NN, and NL (a) 0 week, (b) Schematic representation of structure of lutein match the functional groups, (c) after stored at −80 °C for 1 week, (d) after stored at −80 °C for 2 weeks, (e) after stored at 25 °C for 1 week, (f) after stored at 25 °C for 2 weeks.
