Removing polyphenol contaminants from feedstock-based polyphenols

A method of producing a pure mixture of native feedstock-based polyphenols from a feedstock for making alcohols or sugars, comprising the steps of:

• prior to enzymatic processing of the feedstock removing contaminating polyphenols from an enzyme solution for converting feedstock to an alcohol or sugar to produce a polyphenol removed enzyme solution;
• combining the polyphenol removed enzyme solution with the feedstock;
• enzymatic processing of the feedstock without contaminating phenols being present by converting the feedstock to at least one of alcohol or sugar, wherein contaminating polyphenols are phenols or polyphenols not sourced from the feedstock;
• and
• producing the pure mixture of native feedstock-based polyphenols from the feedstock free of the contaminating polyphenols from the enzyme solution by separating native feedstock-based polyphenols from at least one of the alcohol, the sugar, or a by-product of the conversion of the feedstock to the sugar or the alcohol, wherein a native composition of the feedstock-based polyphenols is preserved in the pure mixture of native feedstock-based polyphenols, and the pure mixture of native feedstock-based polyphenols free of a contaminating polyphenols is suitable for human consumption to provide a reduction of at least one of a vasoreactivity, a cholesterol level, a dementia, and a cardiovascular disease.