Vitamin E in foods: Determination of tocols and tocotrienols

Slover, Hal T.; Lehmann, Joanna; Valis, Robert J.

doi:10.1007/bf02545626

Cited by 74 publications

(21 citation statements)

References 6 publications

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“…The oils were saponified under N 2 with pyrogaUol added as an antioxidant. Tocopherols were then partially freed of other unsaponifiables by TLC, converted to trimethylsilyl ethers, and analyzed by GLC (7). The internal standard 5,7-dimethyltocol (8) was added prior to saponification.…”

Section: Tocopherol Determinationmentioning

confidence: 99%

Lipid composition of selected vegetable oils

Carpenter

Lehmann

Mason

et al. 1976

J Americ Oil Chem Soc

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This paper gives analytical data on the composition of 14 selected consumer‐available liquid vegetable oils, including soybean, soybean‐cottonseed blends, corn, safflower, peanut, olive and apricot kernel oils. Label information identified six samples as specially processed or refined and three samples as cold pressed with no preservative added; the labels of the remaining five samples did not mention processing. Data are given for fatty acid composition,trans content, location of the double bonds in the unsaturated fatty acids, percent conjugation, tocopherol content, fatty acid composition of the 2‐poisition of the triglycerides, polyunsaturated to saturated fatty acid (P/S) ratio, and the ratio of α‐tocopherol to polyunsaturated fatty acids (α‐T/P). The ranges of values found were: conjugated unsaturation, 0.18–1.09%; α‐tocopherol, 0.01–0.60 mg/gm; total tocopherol 0.14–1.52 mg/gm; P/S, 0.5–8.7; and α‐TP, 0.03–2.26. The compositions of the fatty acids on the 2‐position and on the 1,3‐position of the triglycerides were compared with those calculated by the Evans’ hypothesis and found to agree well for all but olive and apricot kernel oils.

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Section: Tocopherol Determinationmentioning

confidence: 99%

Lipid composition of selected vegetable oils

Carpenter

Lehmann

Mason

et al. 1976

J Americ Oil Chem Soc

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“…Rich dietary sources of vitamin E include wheat germ (atocopherol, b-tocopherol), alfalfa and almonds (a-tocopherol), safflower oil (a-tocopherol), soybean oil (g-tocopherol, dtocopherol), corn oil (g-tocopherol) (17), and whole cereals (b-tocopherol and a-tocotrienol) (18). The b-isomers have been found in only small amounts in the diet (19,20).…”

Section: Introductionmentioning

confidence: 99%

Plasma Vitamin E and Coenzyme Q10 Are Not Associated with a Lower Risk of Acute Myocardial Infarction in Singapore Chinese Adults,

Naidoo¹,

Dam

Koh³

et al. 2012

The Journal of Nutrition

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Vitamin E and coenzyme Q10 (CoQ10) have antioxidant effects that may benefit cardiovascular health. Meta-analyses of randomized controlled trials have not shown a protective effect of supplementation with the vitamin E isomer α-tocopherol on the risk of acute myocardial infarction (AMI), but data on other isomers and CoQ10 are limited. Our objective was to examine the association of the plasma concentrations of vitamin E isomers (α-, γ-, and δ-tocopherol and α-, γ-, and δ-tocotrienol) and CoQ10 (ubiquinol and ubiquinone) with the incidence of AMI. We conducted a nested case-control study with 233 cases of incident AMI and 466 matched controls selected from the Singapore Chinese Health Study, aged 45-74 y at the time of recruitment and free of cardiovascular disease at the time of blood collection. We used conditional logistic regression to examine the association between vitamin E and CoQ10 and the risk of AMI adjusted for other risk factors. In the basic model, higher δ-tocopherol and ubiquinone concentrations were significantly associated with a higher risk of AMI, whereas there were no significant associations for the other vitamin E and CoQ10 isomers. After adjusting for lifestyle and other risk factors, only the association between δ-tocopherol and AMI risk remained significant [OR = 3.09 (95% CI: 1.53, 6.25) highest vs. lowest quintile; P-trend = 0.028]. We did not observe an inverse association between plasma concentrations of vitamin E isomers or CoQ10 and risk of AMI in Singapore Chinese. In contrast, plasma δ-tocopherol concentrations were associated with a higher risk of AMI. Our findings do not support a role of higher vitamin E or CoQ10 intakes in the prevention of AMI.

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“…The extraction procedure for vitamin E is traditionally performed by enzymatic hydrolysis, saponification and Soxhlet extraction (Ruperez et al, 2001;Slover et al, 1969;Wrolstad, 2002). Among these methods, saponification has been widely used for the quantification of vitamin E in cereals (Chun et al, 2006;Lerma-Garcia et al, 2009;Piironen et al, 1986;Ruperez et al, 2001).…”

Section: Introductionmentioning

confidence: 99%