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. 2016 Mar 18;6:23405. doi: 10.1038/srep23405

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(a) SERS spectra of pure OA and three types of vegetable oil (soybean, sesame, and peanut). (b) Box plots of S₁₆₅₆ corresponding to the ETC of OA, with the measured S₁₆₅₆ values of three types of vegetable oils (Luhua brand). Error bars are marked.