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. 2017 Feb 28;9(3):83. doi: 10.3390/toxins9030083

Figure 4.

Figure 4

(a) Standard curve for OTA quantitative analysis in phosphate buffer solution (0.01 M, pH 7.0). The regression equation is: y = 0.272 lnx + 0.828 (0.08 ≤ x ≤ 5.0 µg/L, R2 = 0.98); (b) Matrix-matched standard curves for OTA quantitative analysis in red grape wine and juice samples. The regression equations are: y = 0.245 lnx + 0.786 (0.10 ≤ x ≤ 5.0 µg/L, R2 = 0.98) for grape juice sample and y = 0.202 lnx + 0.797 (0.10 ≤ x ≤ 5.0 µg/L, R2 = 0.99) for red grape wine sample. The vertical bars indicate the standard deviation (n = 3).