Author: František Šantavý
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
Book Description
Polarography of Heart Poisons with Lactone Rings
Author: František Šantavý
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
Book Description
Moderne Methoden der Pflanzenanalyse / Modern Methods of Plant Analysis
Author: K. Paech
Publisher: Springer Science & Business Media
ISBN: 3642649580
Category : Science
Languages : en
Pages : 774
Book Description
If, following the solvent extraction of a hydrocarbon from a plant, it is not known whether it is one or the other, a method of distinguishing the two is described by HENDRICKS, WILDMAN and JONES (1946). The technique involves the infra-red absorption spectra of the two isomers. At about 12 mp. the relative absorption coefficient of rubber is 42% greater than for gutta. ScHLESINGER and LEPER (1951) describe two procedures for separation of the rubber and gutta hydrocarbons from large quantities of crude chicle. In one, the chicle is extracted with benzene which dissolves both isomers. An excess absolute ethyl acetate is added and the mixture stored at 5° C overnight. The gutta precipitates out and the rubber remains in solution. The other method is as follows: (1) Ten grams of chicle are extracted with acetone for 24 hours in a Soxhlet extraction apparatus. (2) The insoluble material in the thimble is allowed to .. it dry, then immersed in 150 ml. of cold Skellysolve B in a refrigerator at 10° C and· allowed to stand for 48 hours with occasional agitation. (3) The thimble is then removed from the solvent and the enclosed residue washed several times with fresh, cold Skellysolve B. (4) An excess of acetone and a few drops of a concentrated aqueous solution of sodium iodide are added to the combined Skellysolve B extract and washings and allowed to stand overnight in a refrigerator.
Publisher: Springer Science & Business Media
ISBN: 3642649580
Category : Science
Languages : en
Pages : 774
Book Description
If, following the solvent extraction of a hydrocarbon from a plant, it is not known whether it is one or the other, a method of distinguishing the two is described by HENDRICKS, WILDMAN and JONES (1946). The technique involves the infra-red absorption spectra of the two isomers. At about 12 mp. the relative absorption coefficient of rubber is 42% greater than for gutta. ScHLESINGER and LEPER (1951) describe two procedures for separation of the rubber and gutta hydrocarbons from large quantities of crude chicle. In one, the chicle is extracted with benzene which dissolves both isomers. An excess absolute ethyl acetate is added and the mixture stored at 5° C overnight. The gutta precipitates out and the rubber remains in solution. The other method is as follows: (1) Ten grams of chicle are extracted with acetone for 24 hours in a Soxhlet extraction apparatus. (2) The insoluble material in the thimble is allowed to .. it dry, then immersed in 150 ml. of cold Skellysolve B in a refrigerator at 10° C and· allowed to stand for 48 hours with occasional agitation. (3) The thimble is then removed from the solvent and the enclosed residue washed several times with fresh, cold Skellysolve B. (4) An excess of acetone and a few drops of a concentrated aqueous solution of sodium iodide are added to the combined Skellysolve B extract and washings and allowed to stand overnight in a refrigerator.
Radiometer Polarographics
Author:
Publisher:
ISBN:
Category : Polarography
Languages : en
Pages : 414
Book Description
Publisher:
ISBN:
Category : Polarography
Languages : en
Pages : 414
Book Description
Proceedings
Author:
Publisher:
ISBN:
Category : Polarography
Languages : en
Pages : 204
Book Description
Publisher:
ISBN:
Category : Polarography
Languages : en
Pages : 204
Book Description
East European Accessions List
Author: Library of Congress. Processing Department
Publisher:
ISBN:
Category : Europe, Eastern
Languages : en
Pages : 928
Book Description
Publisher:
ISBN:
Category : Europe, Eastern
Languages : en
Pages : 928
Book Description
British Chemical and Physiological Abstracts
Author:
Publisher:
ISBN:
Category : Analytical chemistry
Languages : en
Pages : 880
Book Description
Publisher:
ISBN:
Category : Analytical chemistry
Languages : en
Pages : 880
Book Description
Modern Methods of Plant Analysis
Author:
Publisher:
ISBN:
Category : Plants
Languages : en
Pages : 792
Book Description
Publisher:
ISBN:
Category : Plants
Languages : en
Pages : 792
Book Description
Collection Des Travaux Chimiques de Tchécoslovaquie
Author:
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 742
Book Description
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 742
Book Description
British Abstracts
Author:
Publisher:
ISBN:
Category : Chemical apparatus
Languages : en
Pages : 818
Book Description
Publisher:
ISBN:
Category : Chemical apparatus
Languages : en
Pages : 818
Book Description
Bibliografia polarografica
Author:
Publisher:
ISBN:
Category : Polarography
Languages : en
Pages : 1036
Book Description
Publisher:
ISBN:
Category : Polarography
Languages : en
Pages : 1036
Book Description