Delta-Tocopherol. Assay of Individual Tocopherols in Mixtures Containing Delta-Tocopherol

Weisler, Leonard; Robeson, C. D.; Baxter, J. G.

doi:10.1021/ac60011a029

Cited by 29 publications

(10 citation statements)

References 8 publications

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“…Absolute ethanol (14). Commercial absolute ethanol is purified by refluxing 4 liters of ethanol with 2.1 grams of potassium permanganate and 4.2 grams of potassium hydroxide pellets for 1 hour, then distilled from an all-glass apparatus and the first 100-ml.…”

Section: Methodsmentioning

confidence: 99%

Milk Fat Analysis, Protection of Milk Fat Tocopherols during Saponification with Ascorbic Acid

Krukovsky¹

1964

J. Agric. Food Chem.

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Section: Methodsmentioning

confidence: 99%

Milk Fat Analysis, Protection of Milk Fat Tocopherols during Saponification with Ascorbic Acid

Krukovsky¹

1964

J. Agric. Food Chem.

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“…The second method most popular during this period was the Dianisidine coupling reaction (Weisler et al, 1947). The and -tocopherols couple with diazotized o-dianisidine in alkali solution.…”

Section: Identification and Estimation Of Tocopherols And Tocotrienol...mentioning

confidence: 99%

Identification and estimation of tocopherols and tocotrienols in vegetable oils using gas chromatography-mass spectrometry

Mk¹,

Eg²

1972

J. Agric. Food Chem.

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GOVIND RAO, PERKINS a fructosan-accumulating species (Smith and Grotelueschen, 1966), was used to evaluate this method for characterizing and quantitizing carbohydrate fractions in forage plants. Data indicated that roots of this species have a relatively high free fructose content. The increasing fructose/glucose (Cf/ Cg) ratio corresponding with decreasing ethanol extractions beginning with the 92.5 % hydrolyzed extraction indicated the presence of fructosans of varying chain lengths and the greatest quantity of fructose was extracted with 60% ethanol. These data corroborate the findings of Smith and Grotelueschen (1966). Fructosans in grasses are reported to be similar to the inulin type found in Compositae, but are thought to occur in chain lengths shorter than 35 fructofuranose residues linked 2:6 and terminated by a sucrose residue (Bacon, 1960; Edleman, 1960). In this experiment, fructose/glucose ratios increased with decreasing ethanol concentration indicating the presence of fructosans with average chain lengths of 1.05 (sucrose) at 92.5% ethanol extraction to 20.6 (inulin) at 0% ethanol extraction, in tall fescue roots.Colorimetric determination of fructose in the presence of glucose can be used advantageously for differentiating these two sugars in plant extracts where they are present in greatest quantities. This method, in combination with the ethanol dilution extractions and acid hydrolyses, allows for routine quantitative description of carbohydrates in plant material, with the exception of starch. Because of the simplicity of this method, it can be used for routine determination of sugar components in forage samples, in particular the fructosan accumulating species. LITERATURE CITED

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“…Beta tocopherol has been dis.covered only in wheat germ oil. Delta toeopherol has been reported to be present to the extent of about 10% of the total tocopherol in cottonseed oil (1). This tocopherol gives a gradual increase in color in the total tocopherol deterlnination (2).…”

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confidence: 99%

“…The hydrogenation step (6) has recently been found to be unnecessary. The gamma to copherol determination, actually the non-alpha tocopherol determination, is performed by the method of Weisler, Robeson, and Baxter (1). The hydrogenation step might still be necessary for crude oils, etc.…”

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confidence: 99%

Vitamin e analytical procedure for cottonseed and its products

Deacon

Wamble

1954

J Americ Oil Chem Soc

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Conclusions A procedure for the analysis of cottonseed and its products for Vitamin E has been developed and improved. The present procedure generally gives good checks on duplicate analyses. The Vitamin E content of whole cottonseed is somewhat more a function of variety than of locality. The 1952 crop of cottonseed contained more Vitamin E than the 1951 crop. The two crops averaged 84 g. per ton and 68.5 g. per ton, respectively. Most recent results show that there is no loss of Vitamin E in the storage of cottonseed or during the processing of the seed for its oil and other products. The hexane‐soluble portion of a methanol extract of rolled or cooked cottonseed meats contains Vitamin E in concentrations that have exceeded the values reported for wheat germ oil, the present commercial source. A sample of commercial solvent extracted cottonseed meal was found to contain considerably less Vitamin E than hydraulic‐ or screw‐pressed meals.

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Delta-Tocopherol. Assay of Individual Tocopherols in Mixtures Containing Delta-Tocopherol

Cited by 29 publications

References 8 publications

Milk Fat Analysis, Protection of Milk Fat Tocopherols during Saponification with Ascorbic Acid

Milk Fat Analysis, Protection of Milk Fat Tocopherols during Saponification with Ascorbic Acid

Identification and estimation of tocopherols and tocotrienols in vegetable oils using gas chromatography-mass spectrometry

Vitamin e analytical procedure for cottonseed and its products

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