Enthalpies of Transfer of the −CH2− Moiety into Aqueous Amide Solvent Systems; Values fromn-Alcohol Solutes

2003 ◽  
Vol 107 (47) ◽  
pp. 13188-13191 ◽  
Author(s):  
Sedigheh Noban ◽  
Paul Donohue ◽  
W. Earle Waghorne
Keyword(s):  
Enthalpies Of Transfer ◽  
Amide Solvent ◽  
Solvent Systems

Enthalpies of transfer of formamide, N-methylformamide, N,N-dimethylformamide and urea from water to some aqueous alcohol solvent systems at 298 K

1991 ◽  
Vol 87 (15) ◽  
pp. 2447 ◽  
Author(s):  
Gerard Carthy ◽  
David Feakins ◽  
Colm O'Duinn ◽  
W. Earle Waghorne
Keyword(s):  
Aqueous Alcohol ◽  
Enthalpies Of Transfer ◽  
Alcohol Solvent ◽  
Solvent Systems

scholarly journals Dissolution, Gelation and Derivatization of Cellulose in Amide Solvent Systems

2013 ◽  
Vol 62 (4) ◽  
pp. 235-242
Author(s):  
Daisuke ISHII ◽  
Daisuke TATSUMI ◽  
Hisao HAYASHI ◽  
Takayoshi MATSUMOTO
Keyword(s):  
Amide Solvent ◽  
Solvent Systems

Hydrogen-Bonded Solvent Systems

1969 ◽  
Vol 67 (1_3) ◽  
pp. 168-168
Author(s):  
H. G. Hertz
Keyword(s):  
Solvent Systems ◽  
Hydrogen Bonded

VANILLINSÄURE ALS ENDPRODUKT DES STOFFWECHSELS VON ADRENALIN UND NORADRENALIN. II.

1963 ◽  
Vol 44 (1) ◽  
pp. 101-106 ◽  
Author(s):  
Wilhelm Dirscherl ◽  
Helmut Thomas
Keyword(s):  
Rat Liver ◽  
Paper Chromatography ◽  
Column Chromatography ◽  
Vanillic Acid ◽  
Hippuric Acid ◽  
Single Spot ◽  
Solvent Systems ◽  
Perfusion Experiment ◽  
Kinetics Of

ABSTRACT Perfusion of rat liver with vanillic acid yielded only one metabolite. In paper chromatography with three different solvent systems, the substance showed the same RF-values as vanillyolglycine (3-methoxy-4-hydroxyhippuric acid) and in mixed chromatograms there was only one single spot. After separation by column chromatography, the UV- and IRspectra of the reaction product were identical with those of 3-methoxy4-hydroxy-hippuric acid. During the perfusion experiment, the kinetics of the conjugation were investigated.

OPTIMIZATION OF THIN LAYER CHROMATOGRAPHY METHODS FOR SEPARATION AND IDENTIFICATION OF ANTIDEPRESSANTS IN THEIR MIXTURE

2014 ◽  
Vol 21 (1) ◽  
pp. 11-15
Author(s):  
Daiva Kazlauskienė ◽  
Guoda Kiliuvienė ◽  
Palma Nenortienė ◽  
Giedrė Kasparavičienė ◽  
Ieva Matukaitytė
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Solvent System ◽  
Ammonia Solution ◽  
Relative Standard ◽  
Rf Values ◽  
Solvent Systems ◽  
Paroxetine Hydrochloride ◽  
Fluvoxamine Maleate ◽  
Layer Chromatography

By conducting the toxicological analysis it is meaningful to determine the analytical system that could identify simultaneously several medicinal preparations quickly and precisely. The purpose of this work was to create and validate the method of thin-layer chromatography that would be suitable to separate the components of antidepressant mixture (amitriptyline hydrochloride, paroxetine hydrochloride, sertraline hydrochloride, fluvoxamine maleate and buspirone hydrochloride) and to identify them. The system was validated with regard to the sensitivity, repetition of data, resistance and particularity. The solvent systems with potential of high separation of components in their mixture were created: acetonitrile, methanol, ammonia solution 25 percent (85:10:5); acetonitrile, methanol, ammonia solution 25 percent (75:20:5); dichlormethane, 1,4-dioxane, ammonia solution 25 percent (50:45:5); dichlormethane, 1,4-dioxane, ammonia solution 25 percent (42:55:3); trichlormethane, 1,4-dioxane, ammonia solution 25 percent (25:70:5); trichlormethane, 1,4-dioxane, ammonia solution 25 percent (60:36:4). One of the most suitable solvent systems for separation of the analyzed mixture (sertraline, amitriptyline, paroxetine, buspirone, fluvoxamine) was determined – acetonitrile, methanol, ammonia solution 25 percent (85:10:5). When this solvent system was used, the average Rf values of the analyzed compounds differed the most. Validation was conducted – the relative standard deviation (RSD, percent) of the average Rf value of the analyzed compounds varied from 0,6 to 1,8 percent and did not exceed the permissible error of 5 percent. The sensitivity of methodology was determined by assessing the intensity of the mixture’s spots on the chromatographic plate. The detection limit of buspirone was 0,0012 µg; sertraline – 0,0008 µg; amitriptyline – 0,0004 µg; fluvoxamine – 0,0004 µg; paroxetine – 0,0008 µg. The resistance of results to the changed conditions – it was determined that when the amounts of the solvents acetonitrile and methanol were increased or decreased to two milliliters, the average Rf values of the analyzed compounds did not change statistically significantly

The Influence of Extraction Solvent on the Active Principles Content of Portulaca Oleracea Native Species

2018 ◽  
Vol 69 (10) ◽  
pp. 2682-2692 ◽  
Author(s):  
Candice Popescu (Popiniuc) ◽  
Carmen Popescu ◽  
Stefan Manea ◽  
Valentin Vladut ◽  
Iulian Voicea ◽  
...  
Keyword(s):  
Medicinal Plant ◽  
Propylene Glycol ◽  
Native Species ◽  
Portulaca Oleracea ◽  
Extraction Solvent ◽  
Beneficial Effects ◽  
Solvent Systems

In this paper, a study on the influence of extraction solvent on the active principles content of purslane - Portulaca oleracea extracts was performed. For the study were used both fresh and dried plants, chopped by plant chopping machine. The following extracts were obtained and analysed in the solvent systems mentioned below: (fresh) purslane extract in Ethanol 30%, (dry) purslane extract in Ethanol 30%; (fresh) purslane extract in EtOH 70%, (dry) purslane extract in EtOH 70%; (fresh) purslane extract in propylene glycol 20%, (dry) purslane extract in propylene glycol 20%; (fresh) purslane extract in PG 100%, (dry) purslane extract in PG 100%; (fresh) purslane extract in glycerine 20%, (dry) purslane extract in glycerine 20%; (fresh) purslane extract in R glycerine, (dry) purslane extract in R glycerine; purslane hydro-alcoholic glycerine extract. The results obtained in the study performed on purslane extracts in different solvents show that the capitalization of purslane can become very profitable and with beneficial effects on economy in our country, both in terms of food and as medicinal plant.

Phamacognostical and Pharmaceutical Evaluation of Chandrashakaladi Vataka - A herbal formulation

2016 ◽  
Vol 1 (3) ◽  
Author(s):  
Dr. Akash S Changole ◽  
Mandip Goyal ◽  
Harish CR
Keyword(s):  
Classical Method ◽  
Raw Materials ◽  
Herbal Medicines ◽  
Vital Role ◽  
Published Data ◽  
Herbal Formulation ◽  
Physico Chemical ◽  
Good Manufacturing Practices ◽  
Solvent Systems

Background: Quality control and the standardization of herbal medicines involve steps like standard source and quality of raw materials, good manufacturing practices and adequate analytical screening. These practices play a vital role in guaranting the quality and stability of herbal preparations. Chandrashakaladi Vataka is an Ayurvedic herbal formulation mentioned to be beneficial in Kushtha. Till date no published data is available on its analytical profile. Aim: To develop the Pharmacognostical and Phyto-chemical profile of Chandrashakaladi Vataka. Material and Methods: Chandrashakaladi Vataka was prepared as per classical method and analytical findings were recorded. Samples were subjected to organoleptic analysis, physico-chemical analysis and HPTLC examination by optimizing the solvent systems. Results and Conclusions: Pharmacognostical profile of Chandrashakaladi Vataka was established. Loss on drying, Ash value, Acid insoluble extract, Methanol soluble extract, Chandrashakaladi Vataka was found within prescribed limits. HPTLC profile of Chandrashakaladi Vataka revealed 12 spots at 254 nm and 13 spots at 366 nm.

The interaction parameters of some rubber-solvent systems

1961 ◽  
Vol 26 (12) ◽  
pp. 3101-3108 ◽  
Author(s):  
B. Meissner ◽  
J. Janáček
Keyword(s):  
Interaction Parameters ◽  
Solvent Systems
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