Pectin

When pectin is broken down by micro-organisms, some of the the methylated residue group combines with water (hydrolysis) and changes to the non-methylated group, releasing methanol, which is poisonous

O=C-O-CH3 + H-OH ^ O=C-OH + CH3-OH Any distillation of fruit-based ferments will produce foreshots containing methanol, which is why they should be discarded. Wort derived from grain contains very little pectin, because it remains in the grains. Whole grain mashes will produce some methanol. Purified sugar does not contain any pectin, and sugar-based washes do not produce any methanol. However, the foreshots will contain other unpleasant substances, such as ethyl acetate, and should also be discarded.

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