Another paper deals with the dried persimmon, or kaki fruit. In a paper on coffee grains the authors report astonishingly high values: up to 2mg/100 g (M Rendon, P Gratao et al., Europ Food Res Technol 2013, 236:753-758). Higher hydrogen peroxide concentrations have been noticed in urine after coffee consumption. Finding data for dried material is almost impossible. ![]() ![]() This is 1000 times higher than in the human body. There are a few papers but most of them measure concentrations in fresh plant material for several medicinal herbs they find concentrations which are around 3 micromol/g. This is to some extend related to the fact that it is difficult to measure micromolar concentrations. If the concentration in human plasma is fairly well known (around 3 micromol/l), the content in plant material has not received much attention. H₂O₂ is omnipresent in plants and animals.
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