Derek Gutzeit

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A stable isotope dilution assay was adopted for quantitation of folate vitamers in sea buckthorn berries, juice, and concentrate using fourfold labeled folate isotopologues of the folate derivatives(More)
The primary vitamin in sea buckthorn berries is vitamin C containing values of approximately 400 mg/100 g. Processing effects were investigated during juice and concentrate production from sea(More)
A stable isotope dilution assay for quantification of pantothenic acid in sea buckthorn berries, juice, and concentrate using a four-fold labeled isotopologue of vitamin B5 as the internal standard(More)
Phylloquinone (vitamin K(1)) is the primary dietary source of vitamin K. Processing effects and stability of phylloquinone were investigated during juice and concentrate production from sea buckthorn(More)