Urinary SF and SF metabolites First, a recovery study was conducted using internal standards (ISs), phlorizin (Sigma-Aldrich), sulforaphane-d8 (Toronto Research Chemicals, Canada) and D, L-sulforaphane-d8-N-Acetyl-L-cysteine (Toronto Research Chemicals, Canada), to validate acceptable recovery relative to previously reported solid phase extraction (SPE) methodology 65
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