Purification of Solvents for Absorption Spectroscopy. An Adsorption Method

Graff, Morris M.; O’Connor, Robert T.; Skau, Evald L.

doi:10.1021/i560133a005

Cited by 44 publications

(9 citation statements)

References 5 publications

(3 reference statements)

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“…Petroleum ether (boiling range, 30 to 60 C; analytical reagent grade) was distilled prior to use, and was further purified by percolating the distilled product over silica gel (Graff, O'Connor, and Skan, 1944). Spectral grade petroleum ether was used for chromatographic separation of phytoene.…”

Section: Methodsmentioning

confidence: 99%

Biosynthesis of Yeast Carotenoids

1964

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The biosynthesis of carotenoids was followed in Rhodotorula glutinis and in a new strain, 62-506. The treatment of the growing cultures by methylheptenone, or ionone, vapors permitted observations of the intermediates in the biosynthetic pathway. On the basis of concentration changes and accumulation in blocked pathways, the sequence of carotenoid formation is postulated as phytoene, phytofluene, i-carotene, neurosporene, ,B-zeacarotene, y-carotene, torulin, a C40 aldehyde, and torularhodin. Torulin and torularhodin were established as the main carotenoids of 62-506.

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Section: Methodsmentioning

confidence: 99%

Biosynthesis of Yeast Carotenoids

1964

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“…Standard iron solution was prepared by dissolving ferrous ammonium sulfate crystals in water containing a few milliliters of hydrochloric acid. The objections to this salt as a primary standard are well known (7), but the uncertainty of its composition may be ignored where only microgram quantities are involved. Standard nickel and copper solutions were prepared by dissolving the respective sulfates in water containing a few milliliters of hydrochloric acid, and standardizing the nickel solution gravimetrically with dimethylglyoxime.…”

Section: Methodsmentioning

confidence: 99%

“…The manufacturer's product was found to have a fluorescent substan.ee that was• adsorbed on magnesia. This made purification necessary (7). The solvent was then distilled and a fraction that boiled between 39°and 48°C.…”

Section: Preformed Vitamin a In Mixed Feedsmentioning

confidence: 99%

Preformed Vitamin A in Mixed Feeds

Narod¹,

Verhagen²

1948

Anal. Chem.

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“…1, after five filtrations; 2, after three filtrations; 3, after two fIltra· tions; 4, after one filtration; 5, original material. 6 The original cyclohexane had the refractive index, no", 1.4246 (Abbe refractometer) and specific gravity, d",0.77830. The final constants obtained were no", 1.4230 and d", 0.77580.…”

Section: Wave Length Millimicrons Figure 2-effect Of Filtration Thromentioning

confidence: 99%

Comparison of the purity of samples of organic solvents by ultraviolet spectrophotometry

Maclean¹,

Jencks²,

Acree³

1945

J. RES. NATL. BUR. STAN.

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Studies of the uniformity of different samples of organic solvents by ultraviolet spectrophotometry are described. The procedure used is applicable to the detection of impurities originally present or formed by deterioration and to the study of the effectiveness of purification procedures.Absorption curves are given for n-heptane, 2,2,4-trimethylpentane, cyclohexane, methylcyclohexane, decahydronaphthalene, benzene, carbon tetrachloride, methyl alcohol, ethyl alcohol, ethyl acetate, and dioxane, in two or more grades of purity. The absorption curves of tetrahydronaphthalene, toluene, xylene, chlorobenzene, ethylene dichloride, trichloroethylene, acetone, dimethyldioxane, and carbon bisulfide are discussed briefly. The effect of filtration through silica gel on the ultraviolet absorption of several commercial solvents is shown.

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Purification of Solvents for Absorption Spectroscopy. An Adsorption Method

Cited by 44 publications

References 5 publications

Biosynthesis of Yeast Carotenoids

Biosynthesis of Yeast Carotenoids

Preformed Vitamin A in Mixed Feeds

Comparison of the purity of samples of organic solvents by ultraviolet spectrophotometry

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