Improved Apparatus for Solubility Determination or for Small-Scale Recrystallization

Craig, Lyman C.; Post, Otto W.

doi:10.1021/i560130a031

Cited by 20 publications

(2 citation statements)

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“…(II) leads to absorption at longer waveIengthss ', Similarly, it was possible to decide'" in favour of the structure (IV) rather than (V) for patulin. The ex,{1-unsaturated ketonic side-chain CH 3-C :;::::C-C =:C-C =:C-CH =CH-CH==CH-CH 2-COOH (1) cr CH "0 o cb (V) in helvolic acid can be identifieds", but some infra-red and nuclear magnetic resonance studiess! have shown that the ultra-violet absorption spectrum does not provide the whole story.…”

Section: Ultra-violet Absorptionmentioning

confidence: 99%

Physicochemical methods of investigating natural products

Hw¹

1961

Pure and Applied Chemistry

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Section: Ultra-violet Absorptionmentioning

confidence: 99%

Physicochemical methods of investigating natural products

Hw¹

1961

Pure and Applied Chemistry

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“…Apparatus and methods for titrimetric, gasometric, and photometric microanalysis (21). Solids purification (54) and recrystallization (45).…”

Section: Reviews and Special Apparatusmentioning

confidence: 99%

Organic Microchemistry

Willits¹

1949

Anal. Chem.

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MICROCHEMICALanalyses of organic compounds still follow largely the pattern set by Fritz Pregl. Considerable strides have been made during the past 6 years, as evidenced by the increase in the number of microchemical laboratories and the wider application of microanalytical chemical techniques. During the late twenties and early thirties, microanalytical methods were but little used in the United States except in the Atlantic Coast states. Ten years later these methods had been introduced into the midwestern states, and today micromethods are in use in analytical laboratories throughout the country.The keen interest shown in the development of microchemical analysis is exhibited by the establishment of a committee on the performance of microchemical balances (A. H. Corwin of Johns Hopkins University, chairman); a revival of the committee on standardization of microchemical apparatus (A. Steyermark, chairman); and the re-establishment of a referee on the standardization of microchemical methods by the Association of Official Agricultural Chemists. The British Standards Institute has formed a subcommittee to standardize microchemical apparatus, and the work of this subcommittee is well advanced. Microchemistry has gone a long way since Pregl devised this scheme of analysis, for it is no longer limited to the analysis of material available in only small amounts. Instead, it has an accepted place, along with micromethods, for the analysis of materials available in large amounts. The micromethod is superior, in that it is faster, more economical of reagents, and in many instances more precise and accurate.

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Méthode nouvelle de séparation à échelle préparative, basée sur la „Counter‐Current Distribution”︁

Verzele¹

1953

Bulletin des Soc Chimique

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Methode nouvelle de sbparation ih Bchelle preparative, basbe sur la (( Counter-Current Distribution )) M. VERZELE (Gand) R~J M J~. -L'auteur a mis au point un appareil permettant I'application de la a Counter-Current Distribution )) (C.C.D.) $, Bchelle prBparative. La nouvelle technique, grrice A la construction d'une cellule spBciale permet le dbplacement de la phase lourde. A titre d'exemple I'auteur dBcrit I'extraction de l'acide propionique et butyrique d'une quantitk de 77 g. d'un mBlange renfermant 45 % du premier et 55 yo du second.

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Improved Apparatus for Solubility Determination or for Small-Scale Recrystallization

Cited by 20 publications

References 3 publications

Physicochemical methods of investigating natural products

Physicochemical methods of investigating natural products

Organic Microchemistry

Méthode nouvelle de séparation à échelle préparative, basée sur la „Counter‐Current Distribution”︁

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