Stability of .alpha.-tocopherol during alfalfa dehydration and storage

Livingston, A. L.; Nelson, J.W.; Kohler, Götz

doi:10.1021/jf60157a016

Cited by 37 publications

(13 citation statements)

References 9 publications

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“…As in the current experiment, pasture-fed cattle had greater -tocopherol content in the LTL than cattle fed a mixed ration, 48 as fresh forage has greater -tocopherol content than hay. 49 The greater -tocopherol content of the G-supp beef compared with the Conventional beef was expected, as reported in previous studies comparing grazing cattle and concentrate-fed cattle. 3,34,50 The difference in the fatty acid profile between beef from concentrate-and forage-fed cattle has been widely shown; 8 however, the magnitude of the differences depends on the type of forage fed.…”

Section: Chemical Composition and -Tocopherol Contentsupporting

confidence: 74%

“…As in the current experiment, pasture‐fed cattle had greater α ‐tocopherol content in the LTL than cattle fed a mixed ration, as fresh forage has greater α ‐tocopherol content than hay . The greater α ‐tocopherol content of the G‐supp beef compared with the Conventional beef was expected, as reported in previous studies comparing grazing cattle and concentrate‐fed cattle …”

Section: Discussionmentioning

confidence: 99%

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Is meat quality of forage‐fed steers comparable to the meat quality of conventional beef from concentrate‐fed bulls?

et al. 2017

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Section: Chemical Composition and -Tocopherol Contentsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Is meat quality of forage‐fed steers comparable to the meat quality of conventional beef from concentrate‐fed bulls?

et al. 2017

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“…Carotenes in vegetables and plant tissues are susceptible to oxidation when they are exposed to light (Martin et al, 1960;Charkey et al, 196 1;Park et al, 1983;Saguy et al, 1985), oxygen (Ayers et al, 1964;Blain, 1970;Kohler et al, 1955;Saguy et al, 1985),. warm temperatures (Borchgrevink and Charley, 1966;Saguy et al, 1985), enzymes (Blain, 1970;Kalac and Kyzlink, 1979), moisture (Livingston et al, 1968;Goldman et al, 1983) and storage (Char-key et al, 1961;Livingston et al, 1968;Martin et al, 1960). Dehydrated vegetables, when exposed to air, lose color due to oxidation of highly unsaturated molecules.…”

Section: Introductionmentioning

confidence: 99%

Effect of Freezing, Thawing, Drying, and Cooking on Carotene Retention in Carrots, Broccoli and Spinach

Park

1987

Journal of Food Science

116

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Effects of freezing, thawing, cooking and drying on carotene retention of carrots, broccoli and spinach were evaluated. Relative differences in carotene retention among these vegetables were compared. Dehydration, regardless of drying method, significantly reduced carotene in these vegetables. Carotene contents of fresh, vacuum and microwave dried samples for carrots, broccoli and spinach were 989, 459, 368; 106, 43, 40; and 455, 325, 314 p.g/g, respectively. Lag time after thawing decreased mean carotene of vegetables significantly in a quadratic manner. Degradation of carotene was severe 6 hr after thawing, Cooking did not affect carotene and cooked samples contained 2.0, 2.9, and 1.2 times more carotene than the respective dehydrated vegetables. Destruction of carotene was relatively lower when initial concentrations were low.

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“…TLC on Silica gel G has been used for the assay of tocopherol in a wide variety of materials such as vegetable oils (20,24,25,29), leaves (18,19), alfalfa (21), blood serum ( 15,31,32), liver (17), and tocopherol oxidation products (16). In the case of blood serum, Horwitt et al (32) reported that the losses of tocopherol were excessive when blood serum containing less than 0.6 mg/100 ml was assayed by TLC.…”

Section: Thin Layermentioning

confidence: 99%

Modern procedures for the analysis of tocopherols

Bunnell

1971

Lipids

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The development of reliable assay methodology for the tocopherols has been an evolutionary process which has required over 40 years to reach its present state. Today the analyst has at his disposal a choice of reliable and accurate methods of analysis for the eight tocopherols now known to exist in nature. The general sequence of procedure and the precautions to be observed are described. After suitable extraction procedures and careful saponification techniques, the tocopherols in the nonsaponifiable fraction can be assayed by a variety of chromatographic procedures including paper, thin layer (TLC), column and gas liquid chromatography (GLC). The current methodology of these procedures is reviewed in some detail with special emphasis on the more frequently used TLC and GLC techniques. The earlier methods of GLC assay separated only the mono‐, di‐ and trimethylated tocopherols but methods are now available which provide separation of all the tocopherols. These developments were made possible by better columns and the use of derivatives of tocopherols. In addition to good separation, the GLC method is the most sensitive available for the quantitation of the tocopherols. Spectrophotometric measurements based on Emmerie Engel type reactions have been most frequently used for the final quantitative analysis of the tocopherols separated by paper, TLC, or column chromatography.

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Stability of .alpha.-tocopherol during alfalfa dehydration and storage

Cited by 37 publications

References 9 publications

Is meat quality of forage‐fed steers comparable to the meat quality of conventional beef from concentrate‐fed bulls?

Is meat quality of forage‐fed steers comparable to the meat quality of conventional beef from concentrate‐fed bulls?

Effect of Freezing, Thawing, Drying, and Cooking on Carotene Retention in Carrots, Broccoli and Spinach

Modern procedures for the analysis of tocopherols

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