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This study was undertaken to investigate vitamin E supplements recently offered in abundance in market. The contents of α-, β-, γ- and δ-tocopherols, fatty acid composition, particularly linoleic acid content, and peroxide values of the oils contained were examined in 23 commercial vitamin E supplements. These values were compared with those of the products which were stored for 3 months at 30°C.Results and discussions with reference to appropriateness of indications of contents and prices of the supplements were as follows:1) 25% of the tested supplements were labeled with JSD (Japan special labeling diet) mark, 86% of them indicated total tocopherol content, and 36% α-tocopherol content.2) α-Tocopherol equivalents (mg) per gram of oils and fats of the supplements ranged as widely as from 0.7 to 470 and those per capsule similarly from 1.7 to 100. Therefore, accurate content of α-tocopherol or α-tocopherol equivalent should be indicated for consumers to know actural intake of vitamin E.3) Most of samples contained higher percentage (19.3 to 71.6%) of linoleic acid in their fatty acid composition, where the samples containing linoleic acid more than 50% accounted for 78% of all.4) Peroxide values of the samples were generally low, and samples of less than 5meq/kg oil accounted for 64% of all. The value increased about three times after 3-month storage at 30°C, where decomposition rates of tocopherols were large in δ-, γ- and α-forms in the descending order.5) Few of the supplements were composed of single origin of material and the majority were of several origins.Products containing more tocopherols in their oils inclined to give higher percentages of α-tocopherol and lower of γ-tocopherol showing a relatively close negative correlation.
- 特定非営利活動法人 日本栄養改善学会の論文
特定非営利活動法人 日本栄養改善学会 | 論文
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