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. 2021 Oct 20;13(11):740. doi: 10.3390/toxins13110740

Figure 4.

Figure 4

Four-week stability study of TTX and 4-epiTTX spiked into acetic acid extract of blank oyster matrix (stored in glass vials) or blank oyster matrix at −80, −20, 4 and 40 °C. Values represent % deviations from the average of the −80 °C reference condition. (A) TTX spiked into acetic acid oyster extract, (B) TTX spiked into blank oyster matrix, (C) 4-epiTTX spiked into acetic acid oyster extract and (D) 4-epiTTX spiked into blank oyster matrix. Error bars represent the standard deviation (n = 3), red dotted lines delineate the confidence interval (95%, 2σ) of the −80 °C reference condition (n = 12).