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. Author manuscript; available in PMC: 2022 Aug 15.
Published in final edited form as: J Chromatogr B Analyt Technol Biomed Life Sci. 2021 Aug 5;1180:122888. doi: 10.1016/j.jchromb.2021.122888

Fig.2. LC-MS/MS total ion chromatogram (TIC, A) and extracted ion chromatogram (XIC, B-D) of target analytes (41 AA, cotinine and nicotine) injected at (5 μL) at a concentration of 10 ng/mL in water: methanol (9:1, v/v) analyzed under optimized conditions.

Fig.2.

For the sake of distinction of analytes, extracted ion chromatograms were divided into three fractions (i.e., F1-F3) depending on their peak signal intensity and retention time. Compound number assigned on the peak are shown in Table 2.